CA2603187A1 - Systems, methods, and apparatus for highband excitation generation - Google Patents

Systems, methods, and apparatus for highband excitation generation Download PDF

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Publication number
CA2603187A1
CA2603187A1 CA002603187A CA2603187A CA2603187A1 CA 2603187 A1 CA2603187 A1 CA 2603187A1 CA 002603187 A CA002603187 A CA 002603187A CA 2603187 A CA2603187 A CA 2603187A CA 2603187 A1 CA2603187 A1 CA 2603187A1
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signal
excitation signal
highband
lowband
calculating
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CA002603187A
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French (fr)
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CA2603187C (en
Inventor
Koen Bernard Vos
Ananthapadmanabhan A. Kandhadai
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Qualcomm Inc
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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Processing 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
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/0208—Noise filtering
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00—Speech 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
    • G10L19/02—Speech 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
    • G10L19/0204—Speech 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
    • G10L19/0208—Subband vocoders
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Processing 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
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/038—Speech enhancement, e.g. noise reduction or echo cancellation using band spreading techniques
    • G10L21/0388—Details of processing therefor
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00—Speech 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
    • G10L19/02—Speech 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
    • G10L19/032—Quantisation or dequantisation of spectral components
    • G10L19/038—Vector quantisation, e.g. TwinVQ audio
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00—Speech 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
    • G10L19/04—Speech 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
    • G10L19/16—Vocoder architecture
    • G10L19/18—Vocoders using multiple modes
    • G10L19/24—Variable rate codecs, e.g. for generating different qualities using a scalable representation such as hierarchical encoding or layered encoding
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Processing 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
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/0208—Noise filtering
    • G10L21/0216—Noise filtering characterised by the method used for estimating noise
    • G10L21/0232—Processing in the frequency domain
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Processing 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
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/038—Speech enhancement, e.g. noise reduction or echo cancellation using band spreading techniques

Abstract

A wideband speech encoder according to one embodiment includes a narrowband encoder and a highband encoder. The narrowband encoder is configured to encode a narrowband portion of a wideband speech signal into a set of filter parameters and a corresponding encoded excitation signal. The highband encoder is configured to encode, according to a highband excitation signal, a highband portion of the wideband speech signal into a set of filter parameters. The highband encoder is configured to generate the highband excitation signal by applying a nonlinear function to a signal based on the encoded narrowband excitation signal to generate a spectrally extended signal.

Claims (42)

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

harmonically extending the spectrum of a signal that is based on a lowband excitation signal;

calculating a time-domain envelope of a signal that is based on the lowband excitation signal;

modulating a noise signal according to the time-domain envelope; and combining (A) a harmonically extended signal based on a result of said harmonically extending and (B) a modulated noise signal based on a result of said modulating, wherein the highband excitation signal is based on a result of said combining.
2. The method according to claim 1, wherein said harmonically extending comprises applying a nonlinear function to a signal that is based on the lowband excitation signal.
3. The method according to claim 2, wherein said applying a nonlinear function comprises applying the nonlinear function in the time domain.
4. The method according to claim 2, wherein the nonlinear function is a memoryless nonlinear function.
5. The method according to claim 2, wherein the nonlinear function is time-invariant.
6. The method according to claim 2, wherein the nonlinear function comprises at least one of the absolute value function, the squaring function, and a clipping function.
7. The method according to claim 2, wherein the nonlinear function is the absolute value function.
8. The method according to claim 1, wherein said calculating a time-domain envelope of a signal that is based on the lowband excitation signal includes calculating a time-domain envelope of one among the lowband excitation signal, a lowband speech signal based on the lowband excitation signal, and the harmonically extended signal.
9. The method according to claim 1, wherein said harmonically extending includes harmonically extending the spectrum of an upsampled signal that is based on the lowband excitation signal.
10. The method according to claim 1, said method comprising at least one among (A) spectrally flattening the harmonically extended signal prior to said combining and (B) spectrally flattening the highband excitation signal.
11. The method according to claim 10, 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.
12. The method according to claim 1, said method comprising generating the noise signal according to a deterministic function of information within an encoded speech signal.
13. The method according to claim 1, wherein said combining includes calculating a weighted sum of the harmonically extended signal and the modulated noise signal, wherein the highband excitation signal is based on the weighted sum.
14. The method according to claim 1, wherein said calculating a weighted sum includes weighting the harmonically extended signal according to a first weighting factor and weighting the modulated noise signal according to a second weighting factor, wherein said method comprises calculating one among the first and second weighting factors according to a time-variable condition, and calculating the other among the first and second weighting factors such that a sum of the energies of the first and second weighting factors is substantially constant over time.
15. The method according to claim 1, wherein said calculating a weighted sum includes weighting the harmonically extended signal according to a first weighting factor and weighting the modulated noise signal according to a second weighting factor, wherein said method comprises calculating at least one among the first and second weighting factors according to at least one among (A) a measure of periodicity of a speech signal and (B) a degree of voicing of a speech signal.
16. The method according to claim 15, wherein said method comprises obtaining the lowband excitation signal and a pitch gain value from a quantized representation of a lowband residual, and wherein said method comprises calculating one among the first and second weighting factors according to at least the pitch gain value.
17. 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.
18. A data storage medium having machine-executable instructions describing the method of signal processing according to claim 1.
19. An apparatus comprising:

a spectrum extender configured to perform a harmonic extension of the spectrum of a signal that is based on a lowband excitation signal;

an envelope calculator configured to calculate a time-domain envelope of a signal that is based on the lowband excitation signal;

a first combiner configured to perform a modulation of a noise signal according to the time-domain envelope; and a second combiner configured to calculate a sum of (A) a harmonically extended signal based on a result of said harmonic extension and (B) a modulated noise signal based on a result of said modulation, wherein the highband excitation signal is based on a result of the sum.
20. The apparatus according to claim 19, wherein said spectrum extender is configured to apply a nonlinear function to perform the harmonic extension of the spectrum of a signal that is based on the lowband excitation signal.
21. The apparatus according to claim 20, wherein the nonlinear function comprises at least one of the absolute value function, the squaring function, and a clipping function.
22. The apparatus according to claim 20, wherein the nonlinear function is the absolute value function.
23. The apparatus according to claim 19, wherein said envelope calculator is configured to calculate the time-domain envelope based on one among the lowband excitation signal, a lowband speech signal based on the lowband excitation signal, and the harmonically extended signal.
24. The apparatus according to claim 19, wherein said spectrum extender is configured to perform a harmonic extension of the spectrum of an upsampled signal that is based on the lowband excitation signal.
25. The apparatus according to claim 19, said apparatus comprising a spectral flattener configured to spectrally flatten at least one among the harmonically extended signal and the highband excitation signal.
26. The apparatus according to claim 25, 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.
27. The apparatus according to claim 19, said apparatus comprising a noise generator configured to generate the noise signal according to a deterministic function of information within an encoded speech signal.
28. The apparatus according to claim 19, wherein said second combiner is configured to calculate a weighted sum of the harmonically extended signal and the modulated noise signal, wherein the highband excitation signal is based on the weighted sum.
29. The apparatus according to claim 28, wherein said second combiner is configured to weight the harmonically extended signal according to a first weighting factor and to weight the modulated noise signal according to a second weighting factor, and wherein said second combiner is configured to calculate one among the first and second weighting factors according to a time-variable condition, and wherein said second combiner is configured to calculate the other among the first and second weighting factors such that a sum of the energies of the first and second weighting factors is substantially constant over time.
30. ~The apparatus according to claim 19, wherein said second combiner is configured to weight the harmonically extended signal according to a first weighting factor and to weight the modulated noise signal according to a second weighting factor, wherein said second combiner is configured to calculate at least one among the first and second weighting factors according to at least one among (A) a measure of periodicity of a speech signal and (B) a degree of voicing of a speech signal.
31. ~The apparatus according to claim 30, wherein said apparatus incudes a dequantizer configured to obtain the lowband excitation signal and a pitch gain value from a quantized representation of a lowband residual, and wherein said second combiner is configured to calculate at least one among the first and second weighting factors according to at least the pitch gain value.
32. ~The apparatus according to claim 19, said apparatus including 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.
33. ~The apparatus according to claim 19, said apparatus comprising a cellular telephone.
34. ~The apparatus according to claim 19, 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.
35. ~The apparatus according to claim 19, 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.
36. ~An apparatus comprising:

means for harmonically extending the spectrum of a signal that is based on a lowband excitation signal;

means for calculating a time-domain envelope of a signal that is based on the lowband excitation signal;

means for modulating a noise signal according to the time-domain envelope; and means for combining (A) a harmonically extended signal based on a result of said harmonically extending and (B) a modulated noise signal based on a result of said modulating, wherein the highband excitation signal is based on a result of said combining.
37. ~The apparatus according to claim 36, said apparatus comprising a cellular telephone.
38. ~A method of generating a highband excitation signal, said method comprising:

calculating a harmonically extended signal by applying a nonlinear function to a lowband excitation signal derived from a low-frequency portion of a speech signal; and mixing the harmonically extended signal with a modulated noise signal to generate a highband excitation signal.
39. ~The method according to claim 38, wherein the nonlinear function is the absolute value function.
40. ~The method according to claim 38, said method comprising calculating the modulated noise signal by modulating a noise signal according to a time-domain envelope of one among the lowband excitation signal, a lowband speech signal based on the lowband excitation signal, and the harmonically extended signal.
41. ~The method according to claim 38, wherein said mixing includes calculating a weighted sum of the harmonically extended signal and the modulated noise signal, wherein the highband excitation signal is based on the weighted sum.
42. ~The method according to claim 38, said method comprising at least one of (i) encoding a highband portion of the speech signal according to the highband excitation signal and (ii) decoding a highband portion of the speech signal according to the highband excitation signal.
CA2603187A 2005-04-01 2006-04-03 Systems, methods, and apparatus for highband excitation generation Active CA2603187C (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/US2006/012234 WO2006130221A1 (en) 2005-04-01 2006-04-03 Systems, methods, and apparatus for highband excitation generation

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CA2603187C CA2603187C (en) 2012-05-08

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

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CA2603231A Active CA2603231C (en) 2005-04-01 2006-04-03 Systems, methods, and apparatus for highband time warping
CA2602804A Active CA2602804C (en) 2005-04-01 2006-04-03 Systems, methods, and apparatus for highband burst suppression
CA2603255A Active CA2603255C (en) 2005-04-01 2006-04-03 Systems, methods, and apparatus for wideband speech coding
CA2602806A Active CA2602806C (en) 2005-04-01 2006-04-03 Methods and apparatus for encoding and decoding an highband portion of a speech signal
CA2603229A Active CA2603229C (en) 2005-04-01 2006-04-03 Method and apparatus for split-band encoding of speech signals

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US (8) US8069040B2 (en)
EP (8) EP1866915B1 (en)
JP (8) JP5203929B2 (en)
KR (8) KR100956876B1 (en)
CN (1) CN102411935B (en)
AT (4) ATE485582T1 (en)
AU (8) AU2006232362B2 (en)
BR (8) BRPI0607690A8 (en)
CA (8) CA2603219C (en)
DE (4) DE602006017050D1 (en)
DK (2) DK1864101T3 (en)
ES (3) ES2340608T3 (en)
HK (5) HK1113848A1 (en)
IL (8) IL186441A0 (en)
MX (8) MX2007012187A (en)
NO (7) NO340566B1 (en)
NZ (6) NZ562186A (en)
PL (4) PL1864282T3 (en)
PT (2) PT1864282T (en)
RU (9) RU2402827C2 (en)
SG (4) SG161224A1 (en)
SI (1) SI1864282T1 (en)
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