SMPTE STANDARD ANSI/SMPTE 79M-996 for Digital Video Recording ---- /-in Type D-5 Component Format ---- 55/6 and 65/5 Page of 77 pages Table of contents Scope Normative references 3 Environment and test conditions Video tape 5 Helical recording 6 Program track data 7 Video interface Audio interface 9 Video processing Audio processing Longitudinal track Annex A Tape tension Annex B Cross-tape track measurement technique Annex C Track pattern during insert editing Annex D Application of D-5 format system for recording of wide-screen 55/6 television signal Annex E Bibliography Scope This standard specifies the content, format, and recording method of the data blocks containing video, audio, and associated data which form the helical records on 65-mm (5-in) tape in cassettes as specified in ANSI/SMPTE 63M In addition, this standard specifies the content, format, and recording method of the longitudinal record containing tracking information for the scanning head associated with the helical records, and also the longitudinal cue audio, and time and control code tracks One video channel and four independent audio channels are recorded in the digital format Each of these channels is designed to be capable of independent editing The video channel records and reproduces a component television signal in the 55-line system with a frame frequency of 997 Hz (hereafter referred to as 55/6 system) and 65-line system with a frame frequency of 5 Hz (hereafter referred to as 65/5 system) Figures and show block diagrams of the processes involved in the recorder Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this standard All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent edition of the standards indicated below ANSI S-99, Digital Audio Engineering ---- Serial Transmission Format for Two-Channel Linearly Represented Digital Audio Data (AES-3) ANSI/SMPTE 5M-995, Television ---- Component Video Signal :: ---- Bit-Parallel Digital Interface ANSI/SMPTE 59M-993, Television ---- -Bit :: Component and fsc NTSC Composite Digital Signals ---- Serial Digital Interface SMPTE RP 55-995, Audio Levels for Digital Audio Records on Digital Television Tape Recorders IEC 6 (96), Time and Control Code for Video Tape Recorders IEC 95 (99), Digital Audio Interface CAUTION NOTICE: This Standard may be revised or withdrawn at any time The procedures of the Standard Developer require that action be taken to reaffirm, revise, or withdraw this standard no later than five years from the date of publication Purchasers of standards may receive current information on all standards by calling or writing the Standard Developer Printed in USA Copyright 996 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W Hartsdale Ave, White Plains, NY 67 (9) 76- Approved January, 996
ANSI/SMPTE 79M-996 AUDIO (ANALOG) (DIGITAL) ANALOG/ DIGITAL INTERFACE INTRA- FIELD SHUFFLE OUTER ECC ENCODER BLOCK SHUFFLE VIDEO (ANALOG COMPONENT) (DIGITAL COMPONENT) ANALOG/ DIGITAL INTERFACE CHANNEL DEMUX SWITCH OUTER ECC ENCODER INTRA- FIELD SHUFFLE HELICAL TRACK RECORD DRIVER AND HEAD CHANNEL CODER INNER ECC ENCODER DATA MUX SYNC/ ID GEN CONTROL TRACK INFORMATION CONTROL TRACK GEN TIME AND CONTROL CODE EXT TC TIME CODE GEN RECORD DRIVERS AND HEADS CUE (ANALOG) REC AMP Figure -- Record block diagram AUDIO (ANALOG) (DIGITAL AES/EBU) DIGITAL/ ANALOG INTERFACE AUDIO ERROR CONCEAL INTRA- FIELD DESHUFFLE OUTER ECC DECODER BLOCK DESHUFFLE VIDEO (ANALOG COMPONENT) (DIGITAL COMPONENT) DIGITAL/ ANALOG INTERFACE VIDEO ERROR CONCEAL CHANNEL MUX SWITCH OUTER ECC DECODER INTRA- FIELD DESHUFFLE HELICAL TRACK PLAYBACK HEAD PRE AMP AND EQ SYNC DETEC CHANNEL DECODER INNER ECC DECODER DATA DEMUX CONTROL TRACK INFORMATION CONTROL TRACK PB TIME AND CONTROL CODE TC TIME CODE READER HEADS AND PLAYBACK INTERFACE CUE (ANALOG) PB AMP Figure -- Playback block diagram Page of 77 pages
ANSI/SMPTE 79M-996 IEC 79 (993), Helical-Scan Digital Composite Video Cassette Recording System Using 9 mm Magnetic Tape, Format D (NTSC, PAL, PAL-M) ITU-R BT6-5, Studio Encoding Parameters of Digital Television for Standard :3 and Wide-Screen 6:9 Aspect Ratios ITU-R Report 6- (MOD F), Characteristics of Television Systems ITU-R BS67-, A Digital Audio Interface for Broadcasting Studios ITU-R BT656-3, Interfaces for Digital Component Video Signals in 55-Line and 65-Line Television Systems Operating at the :: Level of Recommendation ITU-R BT6 [Part A] 3 Environment and test conditions 3 Environment Tests and measurements made on the system to check the requirements of this standard shall be carried out under the following conditions: -- Temperature C ± C -- Relative humidity (5 ± )% -- Barometric pressure from 6 kpa to 6 kpa -- Tape conditioning not less than h -- Center tape tension 3 N ± 5 N (see annex A) 3 Reference tape Blank tape for reference recordings should be available from any source meeting the tape characteristics as portrayed by this standard 33 Calibration tape The calibration tapes meeting the requirements of 33 and should be available from manufacturers who produce DTTRs and players in accordance with this standard 33 Record locations and dimensions Tolerances shown in tables or will be reduced by 5% 33 Calibration signals Two sets of signals shall be recorded on the calibration tape: a) Video: % color bars Audio: -khz tone at db below full scale on each of the audio channels Cue: - khz tone at reference level; -khz tone at reference level b) A signal of constant recorded frequency (ie, onehalf the Nyquist frequency) only on tracks of field, segment for the purpose of mechanical alignment Recording level should conform to 663 Video tape Base The base material shall be polyester or equivalent Width The tape width shall be 65 mm ± mm The tape, covered with glass, shall be measured without tension at a minimum of five different positions along the tape using a calibrated comparator having an accuracy of mm ( µm) The tape width is defined as the average of the five readings 3 Width fluctuation Tape width fluctuation shall not exceed 5 µm peak to peak Measurement of tape width fluctuation shall be taken over a tape length of 9 mm The value of tape width fluctuation shall be evaluated by measuring the tape width at points, each separated by a distance of mm Tape thickness Two types of tape thickness shall be permitted by this standard The first tape thickness shall be µm to µm (referred to as µm); the second tape thickness shall be 3 µm to µm (referred to as µm) 5 Transmissivity Transmissivity shall be less than 5%, measured over the range of wavelengths nm to 9 nm Page 3 of 77 pages
ANSI/SMPTE 79M-996 Table -- Record location and dimensions (55/6 system) Dimensions Nominal Tolerance A Time and control code track lower edge Basic B Time and control code track upper edge 5 ± 5 C Control track lower edge 9 ± 5 D Control track upper edge 3 ± 5 E Program area lower edge 69 Derived F Program area width Derived G Cue audio track lower edge 95 ± 5 H Cue audio track upper edge 55 ± 5 I Helical track pitch Ref K Video sector length 555 Derived K Video sector length 5539 Derived L Helical track total length 6397 Derived M Audio sector length 936 Derived P Control track reference pulse to program reference point (see figure ) 59 ± 5 P Cue/time and control code signal, start of code word, to program reference point (see figure ) 3 ± X Location of start of video sector V ± 5 X Location of start of audio sector A ) 5575 ± 5 X3 Location of start of audio sector A ) 579 ± 5 X Location of start of audio sector A3 ) 535 ± 5 X5 Location of start of audio sector A ) 596 ± 5 X6 Location of start of video sector V ) 693 ± 5 Y Program reference point 6 Basic θ Track angle 93 Basic α Azimuth angle (track ) --3 ± 5 α Azimuth angle (track ) 996 ± 5 NOTES Measurements shall be made under the conditions specified in 3 The measurements shall be corrected to account for actual tape speed (see figures B and B) All dimensions in millimeters ) Audio channel numbers vary Page of 77 pages
ANSI/SMPTE 79M-996 Table -- Record location and dimensions (65/5 system) Dimensions Nominal Tolerance A Time and control code track lower edge Basic B Time and control code track upper edge 5 ± 5 C Control track lower edge 9 ± 5 D Control track upper edge 3 ± 5 E Program area lower edge 76 Derived F Program area width 99 Derived G Cue audio track lower edge 95 ± 5 H Cue audio track upper edge 55 ± 5 I Helical track pitch Ref K Video sector length 5566 Derived K Video sector length 5993 Derived L Helical track total length 555 Derived M Audio sector length 936 Derived P Control track reference pulse to program reference point (see figure ) 7966 ± 5 P Cue/time and control code signal, start of code word, to program reference point (see figure ) 995 ± X Location of start of video sector V ± 5 X Location of start of audio sector A ) 553 ± 5 X3 Location of start of audio sector A ) 5663 ± 5 X Location of start of audio sector A3 ) 579 ± 5 X5 Location of start of audio sector A ) 595 ± 5 X6 Location of start of video sector V ) 69 ± 5 Y Program reference point 7 Basic θ Track angle 935 Basic α Azimuth angle (track ) --35 ± 5 α Azimuth angle (track ) 9965 ± 5 NOTES Measurements shall be made under the conditions specified in 3 The measurements shall be corrected to account for actual tape speed (see figures B and B) All dimensions in millimeters ) Audio channel numbers vary Page 5 of 77 pages
ANSI/SMPTE 79M-996 6 Offset yield strength The offset yield strength shall be greater than 9 N for -µm tape and N for -µm tape The force to produce % elongation of a -mm test sample with a pull rate of -mm per minute shall be used to confirm the offset yield strength The line beginning at % elongation parallel to the initial tangential slope is drawn and then read at the point of intersection of the line and the stress-strain curve 7 Magnetic coating The magnetic layer of the tape shall consist of a coating of metal particles or equivalent Coating coercivity The coating coercivity shall be a class ( A/m) with an applied field of A/m (5 Oe) as measured by a 5-Hz or 6-Hz B-H meter or vibrating sample magnetometer (VSM) 9 Particle orientation The metal particles shall be longitudinally oriented 5 Helical recordings 5 Tape speed The tape speed shall be 67 mm/s The tolerance shall be ± % 5 Record location and dimensions 5 The format requires a full-width erasure for continuous recording and a flying erasure for insert editing 5 Record location and dimensions for continuous recording shall be as specified in figures 3 and and tables (55/6 system) and (65/5 system) In recording, sector locations on each helical track shall be contained within the tolerance specified in figure 3 and tables (55/6 system) and (65/5 system) 53 The reference edge of the tape for dimensions specified in this standard shall be the lower edge as shown in figure 3 The magnetic coating, with the direction of tape travel as shown in figure 3, is on the side facing the observer (measuring techniques are shown in annex B) 5 As indicated in figure 3, this standard anticipates a zero guard band between recorded tracks, and the record head width should be equivalent to the track pitch of µm (55/6 system) or µm (65/5 system) The scanner head configuration should be chosen such that the recorded track widths are contained within the limits of µm to µm (55/6 system) or 6 µm to µm (65/5 system) 55 In insert editing, this standard provides a guard band of µm (nominal) between the previously recorded track and the inserted track at editing points only A typical track pattern for insert editing is shown in figure C of annex C 53 Helical track record tolerance zones The lower edges of any eight consecutive tracks starting at the first track in each video frame shall be contained within the pattern of the eight tolerance zones established in figure 5 Each zone is defined by two parallel lines which are inclined at an angle of 93 basic (55/6 system) or 935 basic (65/5 system) with respect to the tape reference edge The centerlines of all zones shall be spaced apart mm basic (55/6 system) or mm basic (65/5 system) The width of zones to 3 and 5 to shall be 6 mm basic The width of zone shall be mm basic These zones are established to contain track angle errors, track straightness errors, and vertical head offset tolerance (measuring technique is shown in annex B) 5 Relative positions of recorded information 5 Relative positions of longitudinal tracks Audio, video, control track, time and control code, and cue track with information intended to be time coincident shall be positioned as shown in figures 3 and 5 Program area reference point The program area reference point is determined by the intersection of a line parallel to the reference edge of the tape at a distance Y from the reference edge and the centerline of the first track in each video field (segment, track ) (See figures 3 and ) Page 6 of 77 pages
ANSI/SMPTE 79M-996 NOTES A, A, A3, and A are audio sectors V and V are video sectors 3 Tape viewed from magnetic coating side Dimensions X to X6 are determined by the program reference point as defined in figure Figure 3 -- Location and dimensions of recorded tracks Page 7 of 77 pages
ANSI/SMPTE 79M-996 CONTROL TRACK RECORD CUE TRACK P P HEAD MOTION A B CONTROL TRACK TIME AND CONTROL CODE TRACK TAPE TRAVEL SERVO REFERENCE PULSE RECORDING-CURRENT WAVEFORM N S S N PROGRAM REFERENCE POINT VIDEO SECTOR X C PREAMBLE RECORDING-CURRENT WAVEFORM DETAIL A CONTROL TRACK Y:BASIC PROGRAM REFERENCE POINT X REFERENCE EDGE TIME AND CONTROL CODE TRACK DETAIL B LOCATION OF VIDEO START Y DETAIL C Figure -- Location of cue and time and control code track record Page of 77 pages
ANSI/SMPTE 79M-996 NOTES Tolerance zone centerlines (55/6 system); (65/5 system) 3 93 (55/6 system); 935 (65/5 system) Figure 5 -- Location and dimensions of tolerance zones of helical track record The end of the preamble and start of the video sector shall be recorded at the program area reference point, and the tolerance is dimension X The locations are shown in figures 3 and ; dimensions X and Y are in tables and The relationship between sectors and contents of each sector is specified in clause 6 55 Gap azimuth 55 Cue track, control track, time code track The azimuth angle of the cue, control track, and time and control code head gaps used to produce longitudinal track records shall be perpendicular to the track record 55 Helical track The azimuth of the head gaps used for the helical track shall be inclined at angles a and a, as specified in tables and, with respect to a line perpendicular to the helical track The azimuth of the first track of every field (segment, track ) shall be oriented in the counterclockwise direction with respect to a line perpendicular to the helical track direction when viewed from the side of the tape containing the magnetic record 56 Transport and scanner The effective drum diameter, tape tension, helix angle, and tape speed taken together determine the track Page 9 of 77 pages
ANSI/SMPTE 79M-996 angle Different methods of design and/or variations in drum diameter and tape tension can produce equivalent recordings for interchange purposes One possible configuration of the transport uses a scanner with an effective diameter of 76 mm Scanner rotation is in the same direction as tape motion during normal playback mode Data are recorded by two groups of four heads mounted apart Figures 6 (55/6 system) and 7 (65/5 system) show one possible mechanical configuration of the scanner, and table 3 shows the corresponding mechanical parameters Figures (55/6 system) and 9 (65/5 system) show the relationship between the longitudinal heads and the scanner Other mechanical configurations are allowable provided the same footprint of recorded information is produced on tape Erase heads are described in 5 and figures 6 and 7 6 Program track data 6 Introduction Each television field is recorded on tracks (55/6 system) or 6 tracks (65/5 system) The helical tracks contain digital data from the video channel and four audio channels Each track contains a video sector followed by four audio sectors corresponding to four audio channels and followed by a second video sector, recorded in that order An edit gap between sectors accommodates timing errors during editing Figure shows the arrangement of video and audio sectors on the tape 6 Labeling convention The least significant bit is written on the left and first recorded to tape The lowest numbered byte is shown at the left/top and is the first encountered in the input data stream Byte values are expressed in hexadecimal notation unless otherwise noted An h subscript indicates a hexadecimal value 63 Sector details Each sector (audio or video) is divided into the following elements: -- Preamble containing clock run-up sequence, sync pattern, identification pattern, and fill pattern; -- Sync blocks containing sync pattern and identification pattern, followed by a fixed length data block with error control; -- Postamble containing sync pattern and identification pattern 63 Sync block The sync block format is common for both audio and video sectors Each sync block contains a sync pattern ( bytes) and an inner code block Each inner block contains an identification pattern ( bytes) and 5 (55/6 system) or 76 (65/5 system) data bytes of video, audio, or outer check bytes followed by inner check bytes The inner code block protects the two bytes of the identification pattern together with 5 data bytes (55/6 system) or 76 data bytes (65/5 system) Figures (55/6 system) and (65/5 system) show the sync block format 63 Sync pattern a) Length: 6 bits ( bytes) b) Pattern: 97F (in hexadecimal notation) Byte Byte c) Protection: None d) Randomization: None 633 Identification pattern As illustrated in figures 3 (55/6 system) and (65/5 system), the first two bytes of each inner block are used for identificaton of sync block, television field, segment (group of helical tracks scanned simultaneously), sector (portion of a track), and helical track Bits to 6 of the second byte (byte 3 of sync block) of the identification pattern identify the track Bit 7 of the second byte (byte 3) identifies a sector on the helical track (see figures 5 and 6) Page of 77 pages
ANSI/SMPTE 79M-996 H5 H6 H7 H H POLE TIP ROTATION 769 EFFECTIVE WRAP ANGEL 97 TOTAL WRAP ANGEL TAPE TRAVEL H9 TAPE TRAVEL H H3 H H H-H : RECORDING HEAD TIPS H9-H: FLYING ERASE HEAD TIPS (INSERT EDITING ONLY) 53 97 357 75 76mm(NOMINAL) DRUM DIAMETER UPPER DRUM H9 CENTER OF H9 H 5 36 H H3 H H 366 CENTER DRUM LOWER DRUM (unit : µm ) Figure 6 -- A possible scanner configuration (55/6 system) Page of 77 pages
ANSI/SMPTE 79M-996 H5 H6 H7 H H POLE TIP ROTATION 755 EFFECTIVE WRAP ANGEL 97 TOTAL WRAP ANGEL TAPE TRAVEL H9 TAPE TRAVEL H H3 H H H-H : RECORDING HEAD TIPS H9-H: FLYING ERASE HEAD TIPS (INSERT EDITING ONLY) 53 97 357 75 76mm(NOMINAL) DRUM DIAMETER UPPER DRUM H9 CENTER OF H9 H 6 6 3 H H3 H H 37 CENTER DRUM LOWER DRUM (Unit : µm ) Figure 7 -- A possible scanner configuration (65/5 system) Page of 77 pages
ANSI/SMPTE 79M-996 97 TOTAL WRAP ANGLE 769 EFFECTIVE WRAP ANGLE 6 593 mm POLE TIP ROTATION TAPE TRAVEL CONTROL HEAD TOP VIEW 593 END OF HELICAL TRACK PROGRAM REFERENCE POINT 9 CENTER LINE 39(6 ) 6 59 NOTE -- Unwrapped, viewed magnetic coating side Figure -- A possible longitudinal head location and tape wrap (55/6 system) Page 3 of 77 pages
ANSI/SMPTE 79M-996 97 TOTAL WRAP ANGLE 755 EFFECTIVE WRAP ANGLE 6 593 mm POLE TIP ROTATION TAPE TRAVEL CONTROL HEAD TOP VIEW 593 END OF HELICAL TRACK PROGRAM REFERENCE POINT 9 CENTER LINE 39(6 ) 7966 6 7 NOTE -- Unwrapped, viewed magnetic coating side Figure 9 -- A possible longitudinal head location and tape wrap (65/5 system) Page of 77 pages
ANSI/SMPTE 79M-996 Parameters 55/6 system 65/5 system Scanner rotation speed (rps) 9/ Number of tracks per rotation Drum diameter (mm) 76 Center span tension (N) 3 Helix angle (degrees) 9 Effective wrap angle (degrees) 769 755 Scanner circumferential speed (m/s) 5 39 H, H3 overwrap head entrance (degrees) 55 H, H3 overwrap head exit (degrees) 6 Angular relationship (degrees) Vertical displacement (mm) Table 3 -- Parameters for a possible scanner design H -- H: H -- H: H3 -- H: H5 -- H: H6 -- H: H7 -- H: H -- H: H -- H: H -- H: H3 -- H: H5 -- H: H6 -- H: H7 -- H: 357 97 53 357 97 53 5 36 5 36 Maximum tip projection (µm) Record head track width (µm) 6 3 6 6 3 6 HEAD T VIDEO SECTOR (56 SYNC BLOCKS) EDIT GAP AUDIO SECTOR EDIT GAP AUDIO SECTOR P E ( SYNC BLOCKS) P E P ( SYNC BLOCKS) EDIT GAP AUDIO SECTOR E P ( SYNC BLOCKS) EDIT GAP E AUDIO SECTOR ( SYNC BLOCKS) P EDIT GAP E VIDEO SECTOR (56 SYNC BLOCKS) P HEAD NOTES T = track preamble (5 bytes) E = in-track preamble 3 P = postamble ( bytes) Sync block: 97 bytes (55/6 system); bytes (65/5 system) 5 Edit gap: 6 bytes nominal (55/6 system); bytes nominal (65/5 system) Figure -- Sector arrangement on helical track Page 5 of 77 pages
ANSI/SMPTE 79M-996 O 3 5 6 6 7 9 9 9 9 93 9 95 96 S S ID ID B B B B B B K K K K K K K K 3 7 6 5 3 SYNC ID DATA INNER CHECK 5 INNER CODE BLOCK (95 BYTES) 97 BYTES Figure -- Sync block format (55/6 system) O 3 5 6 77 7 79 3 5 6 7 S S ID ID B B B B B B K K K K K K K K 75 7 73 7 6 5 3 SYNC ID DATA INNER CHECK 76 INNER CODE BLOCK (6 BYTES) BYTES Figure -- Sync block format (65/5 system) Page 6 of 77 pages
ANSI/SMPTE 79M-996 ARRANGEMENT BYTE BYTE 3 9 BITS 7 BITS SYNC BLOCK NUMBER SECTOR ID SYNC BLOCK NUMBER BYTE O 3 5 6 7 B B B B 3 B B 5 B 6 B 7 PART OF SYNC BLOCK NUMBER SECTOR ID FOR VIDEO SYNC BLOCKS BYTE 3 O 3 5 6 7 B S S C VF VF VF SEC PART OF SYNC BLOCK NUMBER SEGMENT NUMBER OF TRACK NUMBER FIELD NUMBER = SECTOR NUMBER SECTOR ID FOR AUDIO SYNC BLOCKS BYTE 3 O 3 5 6 7 B S S C AF AF AF SEC SYNC BLOCK NUMBER SEGMENT NUMBER OF TRACK NUMBER FIELD NUMBER SECTOR NUMBER = : SAMPLES = : SAMPLES Figure 3 -- Sync block identification format (55/6 system) Page 7 of 77 pages
ANSI/SMPTE 79M-996 ARRANGEMENT BYTE BYTE 3 9 BITS 7 BITS SYNC BLOCK NUMBER SECTOR ID SYNC BLOCK NUMBER BYTE O 3 5 6 7 B B B B B B B B 3 5 6 7 PART OF SYNC BLOCK NUMBER SECTOR ID FOR VIDEO SYNC BLOCKS BYTE 3 O 3 5 6 7 B S S C VF VF VF SEC PART OF SYNC BLOCK NUMBER SEGMENT NUMBER OF TRACK NUMBER FIELD NUMBER SECTOR NUMBER SECTOR ID FOR AUDIO SYNC BLOCKS BYTE 3 O 3 5 6 7 B S S C AF AF AF SEC SYNC BLOCK NUMBER SEGMENT NUMBER OF TRACK NUMBER FIELD NUMBER = SECTOR NUMBER Figure -- Sync block identification format (65/5 system) Page of 77 pages
ANSI/SMPTE 79M-996 NOTES F = field number (,,, 3) S = segment number (,, ) 3 SEC = sector number; C = of track number (, ) T = track number (,,, 3) of track number is identified by the azimuth angle 5 Audio sectors are not shown Figure 5 -- Track, segment and field numbers (55/6 system) NOTES F = field number (,,, 3, 7) S = segment number (,,, 3) 3 SEC = sector number; C = of track number (, ) T = track number (,,, 3) of track number is identified by the azimuth angle 5 Audio sectors are not shown Figure 6 -- Track, segment and field numbers (65/5 system) Page 9 of 77 pages
ANSI/SMPTE 79M-996 a) Length: 6 bits ( bytes) b) Arrangement: The sync block number (byte and bit of byte 3) follows a coded sequence along the track Figure 7 shows the sequence of the sync block numbers The sector ID (bits -7 of byte 3) identifies a particular sector The segment count is a modulo 3 (55/6 system) or modulo (65/5 system) For the 55/6 system, the field count for video sectors is modulo (VF = in byte 3) The field count for audio sectors is modulo (for AF and AF in byte 3) and AF (in byte 3) is used for the identification of the five field sequences For the 65/5 system, the field count for video sectors is modulo and the field count for audio sectors is modulo (AF = ) c) Video field identification: The field address VF, VF, VF (bits, 5, and 6 of byte 3) for video sync blocks shall identify the field sequence as shown below In the case of composite signal input, the field address shall identify the four-field color sequences (55/6 system) or eight-field color sequences (65/5 system), as defined in ITU Report 6 and have the values as shown below: 55/6 system: Component signal input Field Field Field Field Composite signal input VF VF VF Color frame A, field I Color frame A, field II Color frame B, field III Color frame B, field IV NOTE -- Composite recording requires detection of a color field sequence while for component recording this is not required If a component recorder (as for example D-5) in its implementation allows a recording of composite signals as well, it is necessary to detect and maintain proper color field sequence during editing sessions Such a relationship between odd/even fields of a component recording and color fields of a composite recording therefore must be defined as shown in 633 65/5 system: Component signal input Field Field Field Field Field Field Field Field Composite signal input VF VF VF Color field I Color field II Color field III Color field IV Color field V Color field VI Color field VII Color field VIII d) Audio field identification: The field address AF and AF of the audio sync block (bits and 5 of byte 3) shall identify a four-field sequence as shown below The sequence shall be identical for the 55/6 system and the 65/5 system When audio sectors are edited, the four-field sequence shall be maintained Field AF AF m m+ m+ m+3 For the 55/6 system, the field address AF of the audio sync block (bit 6 of byte 3) shall identify a five-field sequence for the number of audio samples in the current field as shown below When audio sectors are edited, the five-field sequence shall be maintained (see 36 d)) For the 65/5 system, the field address AF of the audio sync block (bit 6 of byte 3) shall be set always to Field n n+ n+ n+3 n+ AF 55/6 system 65/5 system Number of audio samples AF Number of audio samples 96 96 96 96 96 e) Protection: The identification pattern is protected by an inner code block f) Randomization: The identification pattern is randomized before being channel coded The random- Page of 77 pages
ANSI/SMPTE 79M-996 EDIT GAP SEC= POST AMBLE AUDIO SECTOR IN-TRACK PREAMBLE EDIT GAP POST AMBLE AUDIO SECTOR IN-TRACK PREAMBLE EDIT GAP POST AMBLE VIDEO SECTOR TRACK PREAMBLE C C3 C C C BF 3 7F OFF OFE OFD OFC 3 FF POST AMBLE VIDEO SECTOR IN-TRACK PREAMBLE EDIT GAP POST AMBLE AUDIO SECTOR IN-TRACK PREAMBLE EDIT GAP POST AMBLE AUDIO SECTOR IN-TRACK PREAMBLE OFF OFE OFD OFC 3 FF C C3 C C C BF 3 7F SEC= NOTE -- Sync block number shown in hexadecimal notation Figure 7 -- Sync block number izing is equivalent to performing the exclusive-or operation between the serial data stream and the serial stream generated by the polynomial function x + x + x 3 + x + (in GF()) The first term is the most significant and the first to enter the division computation The polynomial generator noted above is preset to 5h (55/6 system) or Ch (65/5 system) at the first byte of the identification pattern and continues to cycle until the end of the sync block 63 Data field This block is used for all video and audio data and the associated error correction data a) Length: inner code block For the 55/6 system, the inner code block contains 95 bytes consisting of two identification pattern bytes, 5 data bytes (outer ECC check bytes are considered data), plus inner ECC check bytes For the 65/5 system, the inner code block contains 6 bytes consisting of two identification pattern bytes, 76 data bytes (outer ECC check Page of 77 pages
ANSI/SMPTE 79M-996 bytes are considered data), plus inner ECC check bytes b) Arrangement: See figures and c) Interleaving: None d) Protection: Inner ECC code Type: Reed-Solomon Galois field: GF(56) Field generator polynomial: x + x + x 3 + x +, where x i are place keeping variables in GF(), the binary field Order of use: Left-most term is most significant, oldest in time computationally, and first written to tape Code generator polynomial in GF(56): G(x) = (x+)(x+a)(x+a )(x+a 3 )(x+a )(x+a 5 )(x+a 6 )(x+a 7 ), where a is given by h in GF(56) Check characters: K7, K6, K5, K, K3, K, K, K in K7x 7 + K6x 6 + K5x 5 + Kx + K3x 3 + Kx + Kx + K obtained as the remainder after dividing x D(x) by G(x), where D(x) = IDx 6 + IDx 5 + Bx + + Bx + Bx + B (55/6 system); D(x) = IDx 77 + IDx 76 + B75x 75 + + Bx + Bx + B (65/5 system) Polynomial of full code: IDx 9 + IDx 93 + Bx 9 + B3x 9 + + Bx 9 + Bx + K7x 7 + K6x 6 + + Kx + Kx + K (55/6 system); IDx 5 + IDx + B75x 3 + B7x + + Bx 9 + Bx + K7x 7 + K6x 6 + + Kx + Kx + K (65/5 system) e) Randomization: All data and error correction check characters are randomized before being channel coded The randomization is equivalent to randomization as defined in 633 e) 635 Sector preamble All sectors are preceded by a preamble consisting of a clock run-up sequence, sync pattern ( bytes), identification pattern ( bytes), and fill pattern ( bytes) The clock run-up sequence varies in length depending on the sector The remaining elements of the preamble have the same format for all sectors When a sector is edited, the appropriate preamble, including the run-up sequence, shall be recorded 635 Track preamble (T) The track preamble precedes the first sector of every track The total length of track preamble is 5 bytes long and contains 5 bytes of run-up pattern Ch which is followed by two bytes of sync pattern, two bytes of identification pattern, and four bytes of fill pattern h" a) Arrangement: See figure (a) b) Total length: 5 bytes c) Run-up pattern: Ch d) Sync pattern: See 63 e) Identification pattern: See 633 f) Fill pattern: h g) Protection: None h) Randomization: Only the identification pattern and fill pattern are randomized before being channel coded The randomization is equivalent to randomization as defined in 633 e) 635 In-track preamble (E) An in-track preamble precedes every sector except the first sector of a track The total length is bytes long and contains bytes of run-up pattern Ch followed by two bytes of sync pattern, two bytes of identification pattern, and four bytes of fill pattern h a) Arrangement: See figure (b) b) Total length: bytes c) Run-up pattern: Ch Page of 77 pages
ANSI/SMPTE 79M-996 (a) TRACK PREAMBLE (T) BYTE O 3 6 7 9 5 5 5 53 5 55 56 57 C C C C C C C C h h h h h h h h SYNC ID OO OO OO OO h h h h (b) IN-TRACK PREAMBLE (E) BYTE O 3 C C C C h h h h 6 7 9 3 5 6 7 C C C C SYNC ID OO OO OO OO h h h h h h h h (C) POSTAMBLE (P) BYTE O 3 SYNC ID Figure -- Sector preamble and postamble Figure 6 - Sector preamble and postamble d) Sync pattern: See 63 e) Identification pattern: See 633 f) Fill pattern: h g) Protection: None h) Randomization: Only the identification pattern and fill pattern are randomized before being channel coded The randomization is equivalent to randomization as defined in 633 e) 636 Sector postamble (P) All sectors are followed by a postamble The total length is four bytes and contains two bytes of sync pattern and two bytes of identification pattern a) Arrangement: See figure 6c b) Total length: bytes c) Sync pattern: See 63 d) Identification pattern: See 633 e) Protection: None f) Randomization: Only the identification pattern is randomized before being channel coded The randomization is equivalent to randomization as defined in 633 (e) 6 Edit gaps The space between individual sectors of a track, exclusive of preamble and postamble, is nominally 67 bytes long in the 55/6 system and bytes long in the 65/5 system The edit gap is used to accommodate timing errors during editing In an original recording, the edit gap shall contain a pattern Ch During an edit, the edit gap may be partially overwritten with Ch code provided that preamble and/or postamble of the adjacent unedited track sectors are not overwritten a) Protection: None b) Randomization: None 65 Channel code The channel code shall be an - modulation code which is defined by the following code rules: Page 3 of 77 pages
ANSI/SMPTE 79M-996 NOTES DSV is an abbreviation for digital sum variation and indicates the integral value which is counted from the beginning of the - modulated waveform, taking high level as and low level as -- CDS is an abbreviation for code word digital sum and indicates the DSV of one symbol modulation code 3 -bit data entries in tables and 5 are in hexadecimal notation Selecting the current -bit code, the following steps shall be taken: ) Select a -bit code satisfying the following conditions of (A) and (B) from tables and 5: a) The number of consecutive identical bits at the joint portion with the preceding -bit code is two to seven b) The absolute value of the DSV at the end of the code (called end DSV hereafter) is equal to or less than two ) When two or more -bit codes are selected at step (), choose a -bit code that gives the smallest absolute value of the end DSV 3) When two or more -bit codes are still chosen in step (), select a -bit code by calculating the DSV for each bit of the code (called bit DSV hereafter), determining the bit DSV the absolute value of which is minimum for each code, and choosing the code with the bit DSV whose minimum absolute value is smallest ) When two or more -bit codes are further found in step (3), select a -bit code by finding the maximum absolute value of the bit DSV of each code, and choosing a code with the bit DSV whose maximum absolute value is equal to or less than six 5) When two or more codes are still found in step (), select a -bit code satisfying the condition that the number of consecutive identical bits at the joint portion with the preceding -bit code is equal to or less than six 6) When any codes selected at step () do not satisfy step (5), or two or more modulation codes satisfy step (5), select a -bit code satisfying the condition that the number of consecutive identical bits in that code is equal to or less than six 7) When any codes selected at step () do not satisfy step (5) and step (6), or when any codes selected at step (5) do not satisfy step (6), or when two or more codes are further found at step (6), the following two steps shall be taken: a) When the end DSV of the code is --, select a code of higher priority (corresponding to a smaller number in table 6) according to table 6 Likewise, when the end DSV of the code is +, select a code of higher priority (corresponding to a smaller number in table 7) according to table 7 b) When two or more codes belonging to the equal highest priority are found in step (a), select all of them temporarily When the end DSV is zero, select a code satisfying the last six bits except when or are in the code ) When any codes selected at step () do not satisfy steps (5), (6), and (7), or when any codes selected at step (5) do not satisfy step (6) and step (7), or when any codes selected at step (6) do not satisfy step (7), or when two or more codes are further found at step (7), select a code with the bit DSV whose maximum absolute value is smallest 9) When two or more codes are still found at step (), select a -bit code with the bit DSV whose minimum absolute value appears earliest in the bit string of the code ) When two or more codes are further found at step (9), select a -bit code whose bit will be reversed earliest after the joint portion with the preceding code The recorded data rate (for the scanner configuration defined in 56) and shortest recorded wavelength are given in table, provided for reference only 66 Magnetization 66 Polarity Reproduction of the tape record shall be without regard to the polarity of the recorded flux on the helical tracks Page of 77 pages
Class -bit data Modulation codes beginning with "" CDS Class -bit data Modulation codes beginning with "" CDS (A) 3 5 6 7 9 A B C D E F 3 5 6 7 9 A B C D E F 3 5 6 7 9 A B C D E F 3 3 3 33 3 35 36 37 3 (B) 3 5 6 7 9 A B C D E F 3 5 6 7 9 A B C D E F 3 5 6 7 9 A B C D E F 3 3 3 33 3 35 36 37 3 Table -- - modulation (CDS>) ANSI/SMPTE 79M-996 Page 5 of 77 pages
Class -bit data Modulation codes beginning with "" CDS Class -bit data Modulation codes beginning with "" CDS (A) 39 3A 3B 3C 3D 3E 3F 3 5 6 7 9 A B C D E F 5 5 5 53 5 55 56 57 5 59 5A 5B 5C 5D 5E 5F 6 (B) 39 3A 3B 3C 3D 3E 3F 3 5 6 7 9 A B C D E F 5 5 5 53 5 55 56 57 5 59 5A 5B 5C 5D 5E 5F 6 6 6 63 6 65 66 67 6 69 6A 6B 6C 6D 6E 6F 7 (B) 6 6 63 6 65 66 67 6 69 6A 6B 6C 6D 6E 6F 7 Table (continued) ANSI/SMPTE 79M-996 Page 6 of 77 pages
Class -bit data Modulation codes beginning with "" CDS Class -bit data Modulation codes beginning with "" CDS (A) 7 7 73 7 75 76 77 7 79 7A 7B 7C 7D 7E 7F 7 7 73 7 75 76 77 7 79 7A 7B 7C 7D 7E 7F (A) 3 5 6 7 9 A B C D E F 9 9 9 93 9 95 96 97 9 99 9A 9B 9C 9D 9E 9F A A A A3 A A5 A6 (B) 3 5 6 7 9 A B C D E F 9 9 9 93 9 95 96 97 9 99 9A 9B 9C 9D 9E 9F A A A A3 A A5 A6 Table (continued) ANSI/SMPTE 79M-996 Page 7 of 77 pages
Class -bit data Modulation codes beginning with "" CDS Class -bit data Modulation codes beginning with "" CDS (A) A7 A A9 AA AB AC AD AE AF B B B B3 B B5 B6 B7 B B9 BA BB BC BD BE BF C C C C3 C C5 3(B) A7 A A9 AA AB AC AD AE AF B B B B3 B B5 B6 B7 B B9 BA BB BC BD BE BF C C C C3 C C5 3(A) C6 C7 C C9 CA CB CC CD CE CF D D D D3 D D5 D6 D7 D D9 C6 C7 C C9 CA CB CC CD CE CF D D D D3 D D5 D6 D7 D D9 DA DB DC DD (B) DA DB DC DD Table (continued) ANSI/SMPTE 79M-996 Page of 77 pages
Class -bit data Modulation codes beginning with "" CDS Class -bit data Modulation codes beginning with "" CDS 3(A) DE DF E E E E3 E E5 E6 E7 E E9 (B) DE DF E E E E3 E E5 E6 E7 E E9 (A) EA EB EC ED EE EF F F F F3 EA EB EC ED EE EF F F F F3 F F5 F6 F7 F F9 5(B) F F5 F6 F7 F F9 5(A) FA FB FC FD FE FF FA FB FC FD FE FF Table (concluded) ANSI/SMPTE 79M-996 Page 9 of 77 pages
Class -bit data Modulation codes beginning with "" CDS Class -bit data Modulation codes beginning with "" CDS (C) 3 5 6 7 9 A B C D E F 3 5 6 7 9 A B C D E F 3 5 6 7 9 A B C D E F 3 3 3 33 3 35 36 37 3 - - - - - - - - (D) 3 5 6 7 9 A B C D E F 3 5 6 7 9 A B C D E F 3 5 6 7 9 A B C D E F 3 3 3 33 3 35 36 37 3 - - - - - - - - Table 5 -- - modulation CDS<) ANSI/SMPTE 79M-996 Page 3 of 77 pages
Class -bit data Modulation codes beginning with "" CDS Class -bit data Modulation codes beginning with "" CDS (C) 39 3A 3B 3C 3D 3E 3F 3 5 6 7 9 A B C D E F 5 5 5 53 5 55 56 57 5 59 5A 5B 5C 5D 5E 5F 6 6 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - (D) 39 3A 3B 3C 3D 3E 3F 3 5 6 7 9 A B C D E F 5 5 5 53 5 55 56 57 5 59 5A 5B 5C 5D 5E 5F 6 6 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - (C) 6 63 6 65 66 67 6 69 6A 6B 6C 6D 6E 6F 7 - - - - - - - - - - - - - - - 6 63 6 65 66 67 6 69 6A 6B 6C 6D 6E 6F 7 - - - - - - - - - - - - - - - Table 5 (continued) ANSI/SMPTE 79M-996 Page 3 of 77 pages
Class -bit data Modulation codes beginning with "" CDS Class -bit data Modulation codes beginning with "" CDS 7 7 73 7 75 76 77 7 79 7A 7B 7C 7D 7E 7F - - - - - - - - - - - - - - - (D) 7 7 73 7 75 76 77 7 79 7A 7B 7C 7D 7E 7F - - - - - - - - - - - - - - - (C) 3 5 6 7 9 A B C D E F 9 9 9 93 9 95 96 97 9 99 9A 9B 9C 9D 9E 9F A A A A3 A A5 A6 - - - - - - (D) 3 5 6 7 9 A B C D E F 9 9 9 93 9 95 96 97 9 99 9A 9B 9C 9D 9E 9F A A A A3 A A5 A6 - - - - - - Table 5 (continued) ANSI/SMPTE 79M-996 Page 3 of 77 pages
Class -bit data Modulation codes beginning with "" CDS Class -bit data Modulation codes beginning with "" CDS 3(C) A7 A A9 AA AB AC AD AE AF B B B B3 B B5 B6 B7 B B9 BA BB BC BD BE BF C C C C3 C C5 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - (D) A7 A A9 AA AB AC AD AE AF B B B B3 B B5 B6 B7 B B9 BA BB BC BD BE BF C C C C3 C C5 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - C6 C7 C C9 CA CB CC CD CE CF D D D D3 D D5 D6 D7 D D9 3(D) C6 C7 C C9 CA CB CC CD CE CF D D D D3 D D5 D6 D7 D D9 (C) DA DB DC DD - - - - DA DB DC DD - - - - Table 5 (continued) ANSI/SMPTE 79M-996 Page 33 of 77 pages
Class -bit data Modulation codes beginning with "" CDS Class -bit data Modulation codes beginning with "" CDS (C) DE DF E E E E3 E E5 E6 E7 E E9 - - - - - - - - - - - - 3(D) DE DF E E E E3 E E5 E6 E7 E E9 - - - - - - - - - - - - EA EB EC ED EE EF F F F F3 (D) EA EB EC ED EE EF F F F F3 F F5 F6 F7 F F9 - - - - - - F F5 F6 F7 F F9 - - - - - - 5(C) FA FB FC FD FE FF - - 5(D) FA FB FC FD FE FF Table 5 (concluded) ANSI/SMPTE 79M-996 Page 3 of 77 pages
ANSI/SMPTE 79M-996 Table 6 -- Priority of modulation code selection (end DSV = --) Modulation codes Priority x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x 3 x x x x x x x x x x x x x x x x x x x x x x x x x x x x 5 x x x x x x x x x 6 x x x x x x x x 7 x x x x x x x 9 x x x x x x NOTES x is a don t-care bit This table shall be used in the case where DSV at the end of modulation code is -- Table 7 -- Priority of modulation code selection (end DSV = +) Modulation codes Priority x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x 3 x x x x x x x x x x x x x x x x x x x x x x x x x x x x 5 x x x x x x x x x 6 x x x x x x x x 7 x x x x x x x 9 x x x x x x NOTES x is a don t-care bit This table shall be used in the case where DSV at the end of modulation code is + Table -- Data rate and wavelength Parameter 55/6 system 65/5 system Total average data rate 36 Mb/s 33 Mb/s Instantaneous channel data rate 765 Mb/s 77 Mb/s Shortest recorded wavelength 6 µm 7 µm Page 35 of 77 pages
ANSI/SMPTE 79M-996 66 Recorded equalization The record head current applied to a head should generate a constant magnetic flux level within a gap from the lowest recorded frequency (ie, approximately one-third the Nyquist frequency) to the Nyquist frequency 663 Record level The level of the record head current applied to a head with a gap should be optimized for best reproduced signal-to-noise ratio at the highest constant recorded frequency (ie, the Nyquist frequency of the channel) Other methods of setting the record level are permitted, providing they achieve the same results 7 Video interface The video signal interface shall conform to the following: 55/6 system Analog interface ITU-R Report 6 Digital parallel interface ANSI/SMPTE 5M Digital serial interface ANSI/SMPTE 59M 65/5 system Analog interface ITU-R Report 6 Digital parallel interface ITU-R BT656 Digital serial interface IEC 79 Audio interface Encoding parameters The digital audio signal is encoded according to the following parameters: Sampling a) The sampling frequency is khz and shall be related to the horizontal frequency as follows: khz = FH / 375 (55/6 system); khz = FH 3 / 5 (65/5 system) b) The resolution of each sample is 6 bits minimum, bits maximum c) The coding is twos complement linear PCM Reference level The recommended recorded audio levels should conform to SMPTE RP 55 Digital signal interface The principal mode of interface is analog The audio signal may also be input and output digitally in a bit-serial form The bit-serial interface, if present, shall conform to ANSI S and IEC 95 without error checking 9 Video processing 9 Introduction The purpose of the video processing operation is to transform the input component video digital data into a form suitable for tape recording By reassembling odd and even samples of the luminance data, two equal-size data blocks are produced All four data blocks, odd luminance Yo, even luminance Ye, color difference CR, and color difference CB, are of equal data volume Additional data space, samples in duration, is added to each horizontal line of data for all four data blocks Color-difference samples CR,CB, and even-luminance sample Ye are handled together as one group Odd luminance samples are handled independently (see figures D3--D5) The total video data are distributed into video blocks ( channels, each channel with 3 video blocks) for the 55/6 system and 6 video blocks ( channels, each channel with video blocks) for the 66/5 system The data are converted from -bit words to -bit words (see figure D6) and randomized Column shuffling, outer error correction code addition, and interleaving operations are performed Sync, ID, and inner error correction code are added to each sync block, the smallest data block Prior to recording, randomization and -- conversion are performed Page 36 of 77 pages
ANSI/SMPTE 79M-996 9 Recorded data 9 Recorded samples and lines of the television frame Video samples and reserve data are recorded in the following manner: In a 55/6 system, 55 consecutive lines and in a 65/5 system, 3 consecutive lines of each field are recorded on tape Each line contains the following data: Y: 7 samples/line of luminance signal (Y) plus samples/line of reserved data CR: 36 samples/line of color-difference signal (CR) plus samples/line of reserved data CB: 36 samples/line of color-difference signal (CB) plus samples/line of reserved data The first recorded sample of each field shall vary as shown below 55/6 system -- From field, the first recorded sample is number of line 9; -- From field, the first recorded sample is number of line 7 65/5 system -- From field, the first recorded sample is number of line 7; -- From field, the first recorded sample is number of line 3 When the first recorded line in the vertical blanking period of each field is not used, all samples shall be set at h for the luminance sample and h for the color-difference sample Figures 5 and 6 show track, segment, and field number on the tape 9 Nonrecorded data a) Information received during the following lines are not recorded on tape The appropriate blanking, sync, and burst data are recreated for output during playback 55/6 system -- Field, line through line ; -- Field, line 6 through line 7 65/5 system -- Field, from line 6 of previous field through line 6 of field -- Field, from line 3 through line 39 of field b) The digital horizontal blanking interval is defined in ITU-R 6 93 Source precoding No source precoding is applied to the input video data 93 Luminance separation and video reserve data Luminance samples are separated into two groups consisting of odd and even samples (Yo and Ye) The separated two groups of luminance samples Yo, Ye with color-difference samples CR and CB shall contain the picture content of 55 lines (55/6 system) or 3 lines (65/5 system) of video data signal These four signals (Yo, Ye, CR, CB) are formatted into four groups of 36 samples each for each line of video data These 36 samples on each line (see figures 9 and ) are followed by samples of video reserve data which is set to h and reserved for future use 9 Channel and video block distribution The data of each sample shall be distributed by channel and segment as follows: Let L be the television line number within the video field: L =,, 5 (55/6 system) L =,, 33 (65/5 system) Let H be the horizontal sample location within line L: H =,, 767 Samples of Ye (luminance even samples) and their corresponding color-difference samples, CR and CB, are placed together within a given Vblk of a given channel Samples of Yo (luminance odd samples) are placed away from Ye sample groups in a separate Vblk of the same or different channel Page 37 of 77 pages
ANSI/SMPTE 79M-996 Line Yo H Y Y 3 Y 5 3 Samples 36 Samples Y79 Video reserve data Line CR CR CR CR CR7 Line Ye Y Line CB CB Y Y CB CB Y7 CB7 bit deep L (55 lines) 55 (36 + ) sample/field Line 5 Figure 9 -- Separated luminance and color-difference samples (55/6 system) Figure 9 - Separated luminance and color difference samples (55/6 system) Line Yo H Y Y 3 Y 5 3 Samples 36 Samples Y 7 Y79 Video reserve data Line CR CR CR CR CR 6 CR7 Line Ye Y Line CB CB Y Y CB CB CB 6 Y 6 Y7 CB7 bit deep L (3 lines) 3 (36 + ) sample/field Line 33 Figure -- Figure Separated - Separated luminance luminance and color-difference and color difference samples samples (65/5 (65/5 system) system) Page 3 of 77 pages
ANSI/SMPTE 79M-996 Index (I) following each horizontal sample as for channel distribution (Ch) and video block distribution (Vblki) is in accordance with figures and The actual index for channel distribution and video block is indicated below For 55/6 system: Ch = {Chi (H mod 6) + int (H/6) + L} mod, Vblk = Vblki (H mod 6) For 65/5 system: Ch = {Chi (H mod ) + int (H/) + L} mod, Vblk = Vblki (H mod ) where Chi and Vblki are constant values as follows: For 55/6 system H mod 6 3 5 Chi 3 Vblki For 65/5 system H mod 3 5 6 7 Chi 3 3 Vblki 3 3 data word The last two s of CB, CR, Ye, Yo of the same sample are then combined into an -bit data word as shown: where subscripts and mean the bits Let Spll be the sample number of the combined -bit data: Spll =,,, 3 (55/6 system) Spll =,,, 3 (65/5 system) Let Comp be the component signal number as follows: Comp = : CB signal Comp = : CR signal Comp = : Ye signal Comp = 3: Y signal For 55/6 system: Spll = Spls (Comp = ) Spll = Spls (Comp = ) Spll = Spls (Comp = ) Spll = (Spls + 6) mod 3 (Comp = 3) C B C B C R C R Y e Y e Y ο Y ο For 65/5 system: Spls means the sample number of the horizontal direction of figures and Spls = int (H/3) (55/6 system) Spls = int (H/) (65/5 system) where Spls =,,, 3 (55/6 system) Spls =,,, 3 (65/5 system) 95 /-bit arrangement Each data word consists of bits These -bit data words shall be separated into two groups where the first group contains eight s of the original -bit data word and a second group contains the remaining two s of the original -bit Spll = Spls (Comp = ) Spll = Spls (Comp = ) Spll = Spls (Comp = ) Spll = (Spls + ) mod (Comp = 3) Combined -bit group shall be relocated as described in figures 3 and Let Oc be the outer code number within a horizontal video line Oc =,,, 3 Let Spla be the sample number within a video block of each outer code block Spla =,, 39 (55/6 system) Spla =,, 9 (65/5 system) Page 39 of 77 pages
ANSI/SMPTE 79M-996 Ch Line 3 55 55 55 55 Vblk Vblk Vblk Spls 3 Spls 3 Spls 3 (3) (3) (3) CB CB CB CB 7 CB CB Y Y Y Y Y CR CR CR CR CR Y Y 5 Y 67 Y 5 Y 3 CB 6 Y 6 CR 6 Y 3 CB CB 6 Y Y 6 CR CR 6 Y 9 CB Y CR Y 9 CB Y CR Y 5 Y CB Y CR Y 7 CB Y CR Y 3 CB Y CR Y CB Y CR Y 7 bit deep Figure -- Channel and video block distribution (55/6 system) Figure - Channel and video block distribution (55/6 system) Ch 3 Vblk Vblk Vblk Vblk3 Line Spls 3 Spls 3 Spls 3 Spls 3 () () () () CB CB 3 CB 736 CB 6 CB CB 3 Y Y 3 Y 6 Y Y 3 CR CR 3 CR 6 CR CR 3 Y 7 Y 9 Y Y Y 5 33 33 CB Y CR Y 5 CB 6 Y 6 CR 6 Y 33 CB Y CR Y 9 33 CB Y CR Y 9 CB Y CR Y 7 CB Y CR Y 3 CB Y CR Y 9 CB Y CR Y 5 CB Y CR Y 3 CB 6 Y 6 CR 6 Y 3 CB Y CR Y 3 CB Y CR Y 7 bit deep Figure -- Channel and video block distribution (65/5 system) Figure - Channel and video block distribution (65/5 system) Page of 77 pages