CA2603246A1 - Systems, methods, and apparatus for anti-sparseness filtering - Google Patents

Systems, methods, and apparatus for anti-sparseness filtering Download PDF

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Publication number
CA2603246A1
CA2603246A1 CA002603246A CA2603246A CA2603246A1 CA 2603246 A1 CA2603246 A1 CA 2603246A1 CA 002603246 A CA002603246 A CA 002603246A CA 2603246 A CA2603246 A CA 2603246A CA 2603246 A1 CA2603246 A1 CA 2603246A1
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signal
spectrally
excitation signal
filter
highband
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CA002603246A
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French (fr)
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CA2603246C (en
Inventor
Koen Bernard Vos
Ananthapadmanabhan A. Kandhadai
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Qualcomm Inc
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Classifications

    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10LSPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00Processing of the speech or voice signal to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/0208Noise filtering
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10LSPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/02Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using spectral analysis, e.g. transform vocoders or subband vocoders
    • G10L19/0204Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using spectral analysis, e.g. transform vocoders or subband vocoders using subband decomposition
    • G10L19/0208Subband vocoders
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10LSPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00Processing of the speech or voice signal to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/038Speech enhancement, e.g. noise reduction or echo cancellation using band spreading techniques
    • G10L21/0388Details of processing therefor
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10LSPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/02Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using spectral analysis, e.g. transform vocoders or subband vocoders
    • G10L19/032Quantisation or dequantisation of spectral components
    • G10L19/038Vector quantisation, e.g. TwinVQ audio
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10LSPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/04Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
    • G10L19/16Vocoder architecture
    • G10L19/18Vocoders using multiple modes
    • G10L19/24Variable rate codecs, e.g. for generating different qualities using a scalable representation such as hierarchical encoding or layered encoding
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10LSPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00Processing of the speech or voice signal to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/0208Noise filtering
    • G10L21/0216Noise filtering characterised by the method used for estimating noise
    • G10L21/0232Processing in the frequency domain
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10LSPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00Processing of the speech or voice signal to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/038Speech enhancement, e.g. noise reduction or echo cancellation using band spreading techniques

Abstract

A method and apparatus for generating a highband excitation signal (S120) including generating a spectrally extended signal by extending the spectrum of a signal (A400) that is based on an encoded lowband excitation signal (S50);
and performing anti-sparseness filtering (600) of a signal that is based on the encoded lowband excitation signal. The highband excitation signal is based on the spectrally extended signal, and the highband excitation signal is based on a result of the anti-sparseness filtering.

Claims (42)

1. A method of generating a highband excitation signal, said method comprising:

generating a spectrally extended signal by extending the spectrum of a signal that is based on an encoded lowband excitation signal; and performing anti-sparseness filtering of a signal that is based on the encoded lowband excitation signal, wherein the highband excitation signal is based on the spectrally extended signal, and wherein the highband excitation signal is based on a result of said performing anti-sparseness filtering.
2. The method according to claim 1, wherein said performing anti-sparseness filtering includes performing anti-sparseness filtering of the spectrally extended signal.
3. The method according to claim 1, wherein said performing anti-sparseness filtering includes performing anti-sparseness filtering of the highband excitation signal.
4. The method according to claim 1, wherein said performing anti-sparseness filtering of a signal includes performing a filtering operation on the signal according to an all-pass transfer function.
5. The method according to claim 1, wherein said performing anti-sparseness filtering of a signal includes changing the phase spectrum of the signal without substantially modifying the magnitude spectrum of the signal.
6. The method according to claim 1, said method comprising deciding whether to perform anti-sparseness filtering of a signal that is based on the encoded lowband excitation signal, wherein a result of said deciding is based on a value of at least one among a spectral tilt parameter, a pitch gain parameter, and a speech mode parameter.
7. The method according to claim 1, wherein said generating a spectrally extended signal comprises harmonically extending the spectrum of a signal that is based on the encoded lowband excitation signal to obtain the spectrally extended signal.
8. The method according to claim 1, wherein said generating a spectrally extended signal comprises applying a nonlinear function to a signal that is based on the encoded lowband excitation signal to generate the spectrally extended signal.
9. The method according to claim 8, wherein the nonlinear function comprises at least one of the absolute value function, the squaring function, and a clipping function.
10. The method according to claim 1, said method comprising mixing a signal that is based on the spectrally extended signal with a modulated noise signal, wherein the highband excitation signal is based on the mixed signal.
11. The method according to claim 10, wherein said mixing includes calculating a weighted sum of the modulated noise signal and a signal that is based on the spectrally extended signal, wherein the highband excitation signal is based on the weighted sum.
12. The method according to claim 10, wherein said modulated noise signal is based on a result of modulating a noise signal according to a time-domain envelope of a signal based on at least one among the encoded lowband excitation signal and the spectrally extended signal.
13. The method according to claim 12, said method comprising generating the noise signal according to a deterministic function of information within an encoded speech signal.
14. The method according to claim 1, wherein said generating a spectrally extended signal includes harmonically extending the spectrum of an upsampled signal that is based on the encoded lowband excitation signal.
15. The method according to claim 1, said method comprising at least one among (A) spectrally flattening the spectrally extended signal and (B) spectrally flattening the highband excitation signal.
16. The method according to claim 15, wherein said spectrally flattening comprises:

calculating a plurality of filter coefficients based on a signal to be spectrally flattened; and filtering the signal to be spectrally flattened with a whitening filter configured according to the plurality of filter coefficients.
17. The method according to claim 16, wherein said calculating a plurality of filter coefficients includes performing a linear prediction analysis of the signal to be spectrally flattened.
18. The method according to claim 1, said method comprising at least one of (i) encoding a highband speech signal according to the highband excitation signal and (ii) decoding a highband speech signal according to the highband excitation signal.
19. A data storage medium having machine-executable instructions describing the method of signal processing according to claim 1.
20. An apparatus comprising:

a spectrum extender configured to generate a spectrally extended signal by extending the spectrum of a signal that is based on an encoded lowband excitation signal; and an anti-sparseness filter configured to filter a signal that is based on the encoded lowband excitation signal, wherein the highband excitation signal is based on the spectrally extended signal, and wherein the highband excitation signal is based on an output of said anti-sparseness filter.
21. The apparatus according to claim 20, wherein said anti-sparseness filter is configured to filter the spectrally extended signal.
22. The apparatus according to claim 20, wherein said anti-sparseness filter is configured to filter the highband excitation signal.
23. The apparatus according to claim 20, wherein said anti-sparseness filter is configured to filter the signal according to an all-pass transfer function.
24. The apparatus according to claim 20, wherein said anti-sparseness filter is configured to change the phase spectrum of the signal without substantially modifying the magnitude spectrum of the signal.
25. ~The apparatus according to claim 20, wherein said anti-sparseness filter includes decision logic configured to decide whether to filter a signal that is based on the encoded lowband excitation signal, wherein said decision logic is configured to decide based on a value of at least one among a spectral tilt parameter, a pitch gain parameter, and a speech mode parameter.
26. ~The apparatus according to claim 20, wherein said spectrum extender is configured to harmonically extend the spectrum of a signal that is based on the encoded lowband excitation signal to obtain the spectrally extended signal.
27. ~The apparatus according to claim 20, wherein said spectrum extender is configured to apply a nonlinear function to a signal that is based on the encoded lowband excitation signal to generate the spectrally extended signal.
28. ~The apparatus according to claim 27, wherein the nonlinear function comprises at least one of the absolute value function, the squaring function, and a clipping function.
29. ~The apparatus according to claim 20, said apparatus comprising a combiner configured to mix a signal that is based on the spectrally extended signal with a modulated noise signal, wherein the highband excitation signal is based on an output of said combiner.
30. ~The apparatus according to claim 29, wherein said mixer is configured to calculate a weighted sum of the modulated noise signal and a signal that is based on the spectrally extended signal, wherein the highband excitation signal is based on the weighted sum.
31. ~The apparatus according to claim 29, said apparatus including a second combiner configured to modulate a noise signal according to a time-domain envelope of a signal based on at least one among the encoded lowband excitation signal and the spectrally extended signal, wherein the modulated noise signal is based on an output of said second combiner.
32. ~The apparatus according to claim 31, said apparatus comprising a noise generator configured to generate the noise signal according to a deterministic function of information within an encoded speech signal.
33. ~The apparatus according to claim 20, wherein said spectrum extender is configured to harmonically extend the spectrum of an upsampled signal that is based on the encoded lowband excitation signal.
34. ~The apparatus according to claim 20, said apparatus comprising a spectral flattener configured to spectrally flatten at least one among the spectrally extended signal and the highband excitation signal.
35. ~The apparatus according to claim 34, wherein said spectral flattener is configured to calculate a plurality of filter coefficients based on a signal to be spectrally flattened and to filter the signal to be spectrally flattened with a whitening filter configured according to the plurality of filter coefficients.
36. ~The apparatus according to claim 35, wherein said spectral flattener is configured to calculate the plurality of filter coefficients based on a linear prediction analysis of the signal to be spectrally flattened.
37. ~The apparatus according to claim 20, said apparatus comprising at least one of (i) a highband speech encoder configured to encode a highband speech signal according to the highband excitation signal and (ii) a highband speech decoder configured to decode a highband speech signal according to the highband excitation signal.
38. ~The apparatus according to claim 20, said apparatus comprising a cellular telephone.
39. ~The apparatus according to claim 20, said apparatus comprising a device configured to transmit a plurality of packets compliant with a version of the Internet Protocol, wherein the plurality of packets describes the narrowband excitation signal.
40. ~The apparatus according to claim 20, said apparatus comprising a device configured to receive a plurality of packets compliant with a version of the Internet Protocol, wherein the plurality of packets describes the narrowband excitation signal.
41. ~An apparatus comprising:

means for generating a spectrally extended signal by extending the spectrum of a signal that is based on a encoded lowband excitation signal; and an anti-sparseness filter configured to filter a signal that is based on the encoded lowband excitation signal, wherein the highband excitation signal is based on the spectrally extended signal, and wherein the highband excitation signal is based on an output of said anti-sparseness filter.
42. ~The apparatus according to claim 41, said apparatus comprising a cellular telephone.
CA2603246A 2005-04-01 2006-04-03 Systems, methods, and apparatus for anti-sparseness filtering Active CA2603246C (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US66790105P 2005-04-01 2005-04-01
US60/667,901 2005-04-01
US67396505P 2005-04-22 2005-04-22
US60/673,965 2005-04-22
PCT/US2006/012233 WO2006107839A2 (en) 2005-04-01 2006-04-03 Method and apparatus for anti-sparseness filtering of a bandwidth extended speech prediction excitation signal

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CA2603246A1 true CA2603246A1 (en) 2006-10-12
CA2603246C CA2603246C (en) 2012-07-17

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CA2603229A Active CA2603229C (en) 2005-04-01 2006-04-03 Method and apparatus for split-band encoding of speech signals
CA2603187A Active CA2603187C (en) 2005-04-01 2006-04-03 Systems, methods, and apparatus for highband excitation generation
CA2602804A Active CA2602804C (en) 2005-04-01 2006-04-03 Systems, methods, and apparatus for highband burst suppression
CA2602806A Active CA2602806C (en) 2005-04-01 2006-04-03 Methods and apparatus for encoding and decoding an highband portion of a speech signal
CA2603246A Active CA2603246C (en) 2005-04-01 2006-04-03 Systems, methods, and apparatus for anti-sparseness filtering
CA2603219A Active CA2603219C (en) 2005-04-01 2006-04-03 Method and apparatus for vector quantizing of a spectral envelope representation
CA2603231A Active CA2603231C (en) 2005-04-01 2006-04-03 Systems, methods, and apparatus for highband time warping
CA2603255A Active CA2603255C (en) 2005-04-01 2006-04-03 Systems, methods, and apparatus for wideband speech coding

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CA2603229A Active CA2603229C (en) 2005-04-01 2006-04-03 Method and apparatus for split-band encoding of speech signals
CA2603187A Active CA2603187C (en) 2005-04-01 2006-04-03 Systems, methods, and apparatus for highband excitation generation
CA2602804A Active CA2602804C (en) 2005-04-01 2006-04-03 Systems, methods, and apparatus for highband burst suppression
CA2602806A Active CA2602806C (en) 2005-04-01 2006-04-03 Methods and apparatus for encoding and decoding an highband portion of a speech signal

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CA2603219A Active CA2603219C (en) 2005-04-01 2006-04-03 Method and apparatus for vector quantizing of a spectral envelope representation
CA2603231A Active CA2603231C (en) 2005-04-01 2006-04-03 Systems, methods, and apparatus for highband time warping
CA2603255A Active CA2603255C (en) 2005-04-01 2006-04-03 Systems, methods, and apparatus for wideband speech coding

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JP (8) JP5161069B2 (en)
KR (8) KR100956876B1 (en)
CN (1) CN102411935B (en)
AT (4) ATE482449T1 (en)
AU (8) AU2006232364B2 (en)
BR (8) BRPI0607691B1 (en)
CA (8) CA2603229C (en)
DE (4) DE602006017050D1 (en)
DK (2) DK1864282T3 (en)
ES (3) ES2391292T3 (en)
HK (5) HK1113848A1 (en)
IL (8) IL186436A0 (en)
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