MUSI-6201 Computational Music Analysis
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1 MUSI-6201 Computational Music Analysis Part 5.1: Intensity alexander lerch November 4, 2015
2 instantaneous features overview text book Chapter 4: Intensity (pp ) sources: slides (latex) & Matlab github repository lecture content loudness perception and decibels dynamics in music instantaneous features
3 instantaneous features overview text book Chapter 4: Intensity (pp ) sources: slides (latex) & Matlab github repository lecture content loudness perception and decibels dynamics in music instantaneous features
4 instantaneous features overview text book Chapter 4: Intensity (pp ) sources: slides (latex) & Matlab github repository lecture content loudness perception and decibels dynamics in music instantaneous features
5 instantaneous features overview text book Chapter 4: Intensity (pp ) sources: slides (latex) & Matlab github repository lecture content loudness perception and decibels dynamics in music instantaneous features
6 introduction intensity-related descriptors commonly used waveform view x(t) (pop) x(t) (stringquartet) x(t) (speech) t [s] t [s] t [s] level monitoring (PPM, VU,... ) terms and definitions
7 introduction intensity-related descriptors commonly used waveform view x(t) (pop) x(t) (stringquartet) x(t) (speech) t [s] t [s] t [s] level monitoring (PPM, VU,... ) terms and definitions magnitude intensity envelope level volume velocity loudness
8 human perception 1/2 perception has non-linear relation to intensity: model: logarithmic relation v db (n) = 20 log 10 ( v(n) v 0 v 0 : reference constant (0 db point) digital: v 0 = 1 dbfs scaling factor: 1 db JNDL )
9 human perception 1/2 perception has non-linear relation to intensity: model: logarithmic relation v db (n) = 20 log 10 ( v(n) v 0 v 0 : reference constant (0 db point) digital: v 0 = 1 dbfs scaling factor: 1 db JNDL )
10 human perception 1/2 perception has non-linear relation to intensity: model: logarithmic relation v db (n) = 20 log 10 ( v(n) v 0 v 0 : reference constant (0 db point) digital: v 0 = 1 dbfs scaling factor: 1 db JNDL )
11 excursion: level computation if v(n) = 0 : computation of log 10 (0) work-arounds a add constant ɛ v db (n) = 20 log 10 (v(n) + ɛ) b add if statement v trunc (n) = { v(n), if v(n) ɛ ɛ, otherwise
12 excursion: level computation if v(n) = 0 : computation of log 10 (0) work-arounds a add constant ɛ v db v db [db] v db (n) = 20 log 10 (v(n) + ɛ) ǫ = 1e 01 ǫ = 1e 02 ǫ = 1e 03 ǫ = 1e 04 matlab source: matlab/displaylogepsilon.m v db [db]
13 excursion: level computation if v(n) = 0 : computation of log 10 (0) work-arounds a add constant ɛ v db (n) = 20 log 10 (v(n) + ɛ) b add if statement v trunc (n) = { v(n), if v(n) ɛ ɛ, otherwise
14 human perception 2/2 decibel scale is not loudness scale: equal-sized steps on the decibel scale not perceived as equal-sized loudness steps perceptual loudness depends on frequency cochlear resolution masking effects
15 human perception 2/2 decibel scale is not loudness scale: equal-sized steps on the decibel scale not perceived as equal-sized loudness steps perceptual loudness depends on frequency cochlear resolution masking effects
16 human perception 2/2 120 SPL [db] phon 80 phon 60 phon 40 phon 20 phon 0 phon f [Hz] matlab source: matlab/displayequalloudnesscontours.m
17 dynamics in music score: only several rough dynamic steps,e.g.: pp, p, mf, f, ff comparably vague instructions on volume modifications, e.g.: crescendo, decrescendo, sf dynamics influenced by instrumentation timbre number of voices context and musical tension MIDI: 128 velocity steps no standardized relation to magnitude, power,...
18 dynamics in music score: only several rough dynamic steps,e.g.: pp, p, mf, f, ff comparably vague instructions on volume modifications, e.g.: crescendo, decrescendo, sf dynamics influenced by instrumentation timbre number of voices context and musical tension MIDI: 128 velocity steps no standardized relation to magnitude, power,...
19 dynamics in music score: only several rough dynamic steps,e.g.: pp, p, mf, f, ff comparably vague instructions on volume modifications, e.g.: crescendo, decrescendo, sf dynamics influenced by instrumentation timbre number of voices context and musical tension MIDI: 128 velocity steps no standardized relation to magnitude, power,...
20 dynamics in music score: only several rough dynamic steps,e.g.: pp, p, mf, f, ff comparably vague instructions on volume modifications, e.g.: crescendo, decrescendo, sf dynamics influenced by instrumentation timbre number of voices context and musical tension MIDI: 128 velocity steps no standardized relation to magnitude, power,...
21 features: root mean square 1/2 v RMS (n) = 1 K i e(n) i=i s(n) x(i) 2
22 features: root mean square 1/2 v RMS (n) = 1 K i e(n) i=i s(n) x(i) 2 value of this feature for the hypothetical prototype signals silence sinusoidal (Amplitude A)
23 features: root mean square 1/2 v RMS (n) = 1 K i e(n) i=i s(n) x(i) 2 f [khz] matlab source: matlab/displayfeatures.m x(i) 0-50 v(n) t [s]
24 features: root mean square 2/2 common variants (sample processing only): reduce computational complexity vrms(n) 2 = x(ie(n))2 x(i s(n 1)) 2 + vrms(n 2 1) i e(n) i s(n) + 1 v RMS(n) = vrms 2 (n) single pole approximation v tmp(i) = α v tmp(i 1) + (1 α) x(i) 2 v RMS(i) = v tmp(i)
25 features: root mean square 2/2 common variants (sample processing only): reduce computational complexity vrms(n) 2 = x(ie(n))2 x(i s(n 1)) 2 + vrms(n 2 1) i e(n) i s(n) + 1 v RMS(n) = vrms 2 (n) single pole approximation v tmp(i) = α v tmp(i 1) + (1 α) x(i) 2 v RMS(i) = v tmp(i)
26 features: weighted root mean square x(i) H(z) RMS v(n) H(z): A, B, C weighting RLB (BS.1770)...
27 features: weighted root mean square x(i) H(z) RMS v(n) H(z): A, B, C weighting RLB (BS.1770)...
28 features: weighted root mean square x(i) H(z) RMS v(n) H(z): A, B, C weighting RLB (BS.1770)... H(f) [db] BS.1770 MC ITU-R BS.468 A Weighting C Weighting Z Weighting matlab source: matlab/displayloudnessweighting.m f [Hz]
29 features: peak envelope (max) v Peak (n) = max x(i) i s(n) i i e(n)
30 features: peak envelope (max) v Peak (n) = max x(i) i s(n) i i e(n) x(i) f [khz] v(n) matlab source: matlab/displayfeatures.m t [s] -50
31 features: peak envelope (PPM) 1/2 x(i) x(i) α AT λ v PPM(i) z 1
32 features: peak envelope (PPM) 1/2 x(i) x(i) α AT λ v PPM(i) z 1 release state ( x(i) < v PPM (i 1) λ = α RT )
33 features: peak envelope (PPM) 1/2 x(i) x(i) α AT λ v PPM(i) z 1 release state ( x(i) < v PPM (i 1) λ = α RT ) v PPM (i) = v PPM (i 1) α RT v PPM (i 1) = (1 α RT ) v PPM (i 1)
34 features: peak envelope (PPM) 1/2 x(i) x(i) α AT λ v PPM(i) z 1 attack state ( x(i) v PPM (i 1) λ = 0)
35 features: peak envelope (PPM) 1/2 x(i) x(i) α AT λ v PPM(i) z 1 attack state ( x(i) v PPM (i 1) λ = 0) v PPM (i) = α AT ( x(i) v PPM (i 1) ) + v PPM (i 1) = α AT x(i) + (1 α AT ) v PPM (i 1)
36 features: peak envelope (PPM) 2/2 10 f [khz] x(i) t [s] discuss differences between peak meter and max per block -50 v(n) matlab source: matlab/displayfeatures.m
37 features: peak envelope (PPM) 2/2 10 f [khz] x(i) t [s] discuss differences between peak meter and max per block -50 v(n) matlab source: matlab/displayfeatures.m
38 features: peak envelope (PPM) 2/2 10 f [khz] x(i) t [s] discuss differences between peak meter and max per block -50 v(n) matlab source: matlab/displayfeatures.m
39 features: zwicker loudness Stimulus Outer Ear Transfer Function Excitation Patterns Specific Loudness Overall Loudness v Loud
40 features: zwicker loudness Stimulus Outer Ear Transfer Function Excitation Patterns Specific Loudness Overall Loudness v Loud outer ear transfer function 1 1 D. Hammershøi and H. Møller, Methods for Binaural Recording and Reproduction, Acta Acustica united with Acustica, vol. 88, no. 3, pp , May 2002.
41 features: zwicker loudness Stimulus Outer Ear Transfer Function Excitation Patterns Specific Loudness Overall Loudness v Loud excitation patterns 1 1 M. Schleske, Vibrato of the musician, [Online]. Available: (visited on 07/29/2015).
42 features: zwicker loudness Stimulus Outer Ear Transfer Function Excitation Patterns Specific Loudness Overall Loudness v Loud specific loudness 1 1 U. of Salford, Customised metrics, [Online]. Available: engineering/research/acoustics/psychoacoustics/sound-quality-making-products-sound-
43 features: zwicker loudness Stimulus Outer Ear Transfer Function Excitation Patterns Specific Loudness Overall Loudness v Loud overall loudness v loud = i z i
44 derived features number or ratio of pauses dynamic range statistical features from (RMS) histogram...
45 summary lecture content 1 why are intensity-related features often in db 2 how does the db-scale relate to loudness 3 what are typical intensity-related features
46 summary lecture content 1 why are intensity-related features often in db 2 how does the db-scale relate to loudness 3 what are typical intensity-related features
47 summary lecture content 1 why are intensity-related features often in db 2 how does the db-scale relate to loudness 3 what are typical intensity-related features
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