Digital Phone Hybrid DH400 The most advanced Digital Hybrid with DSP echo canceller and VQR technology. The culmination of 40 years of experience in manufacturing at Solidyne, broadcasting phone hybrids, PBX telephone exchanges and telephone sets. DH400 is controlled by a mini-computer, which automates operations, allowing for very simple use by the operator or the local talent.
DH400 The most advanced Digital Hybrid Phone with DSP echo canceller Is able to work full automatic, attending phone lines, with personalized welcome message, and automatically recording 4 lines simultaneously. THE DH400 HANDLE 4 TELEPHONE LINES, one of them could be a cellular phone. The audio signal is digitized and processed within 4 units DSP (Digital Signal Processor). Rejection of the hybrid is automatically adjusted in two seconds and reaches values of 45 to 60 db. We get such high value, using a technology called digital echo cancellation. This local voice high rejection allows the user to hear at the caller using loudspeakers in large radio studios, auditoriums or television sets. THE DH400 IS DRIVEN BY A MICROCOMPUTER, which supports several work modes that other systems do not possess. For example, it can handle four telephones sets for a radio call center. The local phone operator is able to write, on the PC screen, the name of the caller and any other valuable data, which is immediately transferred to the entire radio PC network, using our free DH400 software. With a simple touch of the Flash button at the telephone set, the telephone operator places on HOLD the phone call without disturbing the console operator. Then, the local talent can switch On-Air the caller, knowing beforehand all the basic information about the caller. IT IS POSSIBLE TO CHANGE THE LINES STATUS (Off, Hold, On-Air, Conference, etc) from anywhere in the LAN where DH400 software is installed, using a mouse, the keyboard or a touch screen PC. So simple, and all automatic. Even the console operator, if desired, can refrain from intervening. DURING THE NIGHT, a single DJ operator can handle the radio. DH400 attends four lines with the welcome message and then places it on HOLD status, with transference to the radio DJ. Pushing the NEXT button, the oldest caller on Hold will go On- Air. In all cases DH400 can be operated from its front panel or through PC software. EXCELLENT AUDIO QUALITY; the absence of local voice return due echo cancellation algorithms, allows for excellent audio quality. And even better, the internal VQR (Voice Quality Restoration) processing allows for high On-Air audio quality, that the audience usually do not distinguish from an interview in Studies. 2 info@solidynepro.com
The solution for broadcastings with audience call centers or telephone based radio programs During the programs it transfer audience calls to call center. The call operators ask the name and other valuable information and write it on the PC, using the DH400 software. Then press Flash button and the call will be on HOLD status. This will be indicated at the DH400 front panel and in every PC of the radio LAN network. Simply press a button or click with the mouse from anywhere on the network PCs, to send On-Air that line or to place two or more lines in conference. The conferences of the DH400 are absolutely perfect because all callers hear each other at high level, due to the properties of the digital echo canceller. ON AIR Control USB Studio 1 Ethernet Studio 2 Monitor on Hold VQR: the magic of the restored sound quality. The DH400 is the integrated technology solution for the handling of the telephone lines in a excellence radio station DH400 incorporates the unique system: VQR of Solidyne, to restore the original voice quality that is lost through a telephone line or cellular. The phone quality is 300-3.400 Hz. But VQR synthesizes the bass and treble allowing obtain a final response from 50-12,000 Hz a near-studio audio quality. The solution for automatic recording of audience messages, 24 hours a day 2 HIBRIDOS DH400 USB 80 DH400 is controlled by a mini-computer, which automates operations, allowing for very simple use by the operator or the local talent. Two DH400 units with a USB80 A/D converter allow recording with high audio quality, 8 telephone lines simultaneously on a single PC, connected via USB. The audience calls are attended by a welcome message inviting them to record a message. All of these recordings will be available instantly at the Master Control Room. DH400 removes limitations on the audio quality of the standard PC answering machines. 3
The solution at night, where a single DJ operator manages the radio station DH400 in Auto-Answer Mode USB Optional Control from PC Pressing the Auto-answer mode, DH400 works alone like a human operator. The solution for radio transmissions from sports conferences, large auditoriums and television sets. LCD screen shows level meters. Everything comes factory-programmed to connect DH400 and go immediately into the air. But it can be customized to optimize the radio needs. DH400 HYBRID Four telephone lines can be automatically handled by DH400, with a welcome message prerecorded in its internal nonvolatile memory. The lines are transferred to the DJ operator in HOLD mode. The DH400 LCD display shows the time on hold of each line. Pressing the button NEXT it goes to the air the line that has waited longer. The conferences of the DH400 are absolutely perfect because all callers hear each other at high level, due to the properties of the digital echo canceller. DH400 LCD screen shows two level meters; sending and receiving. As well as information and options to choose. Rear panel of DH400 with RJ11 connectors for telephone lines and balanced XLR output. BAFFLES AMPLIFIER The technology of digital echo cancellation is the only one that allows you to make conference calls with audiences, through loudspeakers. Its high local voice rejection, both at phone line and acoustics, allows that the local microphone sound will be canceled, avoiding the familiar acoustic couplings that occur with conventional hybrids. Listen audio demos at our WEBsite: ENLISH/Demos/Audio demo VQR. The most advanced Digital Hybrid set. 4 info@solidynepro.com
Technical Specifications DH400 Digital Telephone Hybrid FEATURES & TECHNOLOGY - Digital Hybrid with DSP echo cancellation, auto-adjusted levels of transmission and returns by audio limiters and AGC. - Acoustic echo cancellation. - Auto answering system. - Speakerphone hands free for conference rooms and radio auditorium. - PC Remote control system. It works over a LAN network. - Recording mode with auto-answering and separate outputs for 4 lines. - VQR system for restoration of original voice quality. PHONE LINES - 4 phone lines in conference, with cross gain between them. - Cell phones: One phone line can accept a cell phone. CONTROL BY AGC - Output console with a constant level independent of the telephone line, by audio limiter and Digital AGC. - 20 db variation on the phone line produce less than 1.5 db at the output to console. INPUT LEVEL - Audio send to remote caller has audio limiter and band pass filtering to operate with input signals between 5 dbu and +8 dbu. ECHO CANCELATION - Typical 45-60 db of echo cancelation, using four DSP devices. DSP PARAMETERS - DSP echo cancelation parameters are factory loaded for quick use of DH400. But all parameters can be modified by the user, using LCD display. SENDING LEVEL TO PHONE LINE - -0 dbm +/- 1 db, measured with 2 km artificial line. SEND FILTERS - Band-Pass filters in send channel, limits response to 400 2.200 Hz for canceling on-air sound coloration. OUTPUT LEVEL - +4 dbu balanced. - Measured Over 600 ohms or high-z. - Studio Speaker: 0 dbm. - Cue Output/Speakerphone: -10 dbm. FREQUENCY RESPONSE - 200-3750 Hz +/- 3 db without VQR. - Using VQR it restores audio spectrum between 50-12,000 Hz. GAIN - Auto-adjustable from 0 to 25 db, depending on line level. HARMONIC DISTORTION - Less than 0.1% @ 1 khz, at balanced output. NOISE - S / N over 60 dba, measured with artificial line 2 km. - More than 75 dba using VQR. HYBRID REJECTION - Over 60 db. Measured with artificial line 2 km. LINE ISOLATION - Balanced and floating line inputs with the processor. Isolation 250 V AC. OVERLOAD SAFETY - 2 KVolt protection against lightning discharge using SIOV technology. POWER - 220 / 115 V, 50/60 Hz with a switch. - Consumption: less than 20 VA. DIMENSIONS - Rack mount 19, One module high (44,4 mm). What is the DSP echo cancellation of our DH400 set? The Hybrid mission is to separate the telephone signal that travels toward the caller from the signal that returns from the caller to the console, preventing them from mixing. If you are using 2 pairs of wires all would be very simple (one way to go and another to return) but using only one pair, both signals are mixed. This occurs when we talk to the person remotely; a part of that signal returns with bad audio quality, affecting the local DJ voice on air. Conventional Hybrids use an internal network that simulates the impedance of the phone line. This is only approximate and allows 15 to 30 db of separation of signals. It is named rejection. The digital system converts the analog audio signal into a full digital one. It opens the possibility of a processing at the digital domain, for a perfect simulation of the real phone line. This allows not only simulate impedance, but time delays to create an exact replica of the returning signal. Then, we can sum it with inverted phase to cancel almost completely the annoying signal return. The heart of the digital echo canceller is a FIR, taped delay line filter, of 256 steps. Each of them has a delay and contributes to the total sum through a variable multiplier coefficient. The output of this filter is compared with the input that we sent to a phone line (the speaker's voice from the radio) and automatically and dynamically these 256 coefficients are modified, using a LMS algorithm, to ensure that the response of this artificial line is exactly like the real telephone line. This adjustment is done in a couple of seconds at the conversation start. The output of this line is then summed with inverted phase, to completely cancel the unwanted return. The technology, created in the U.S. for satellite communications, is now available to your radio, incorporated into the DH400. 5