CA2603255A1 - Systems, methods, and apparatus for wideband speech coding - Google Patents
Systems, methods, and apparatus for wideband speech coding Download PDFInfo
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- CA2603255A1 CA2603255A1 CA002603255A CA2603255A CA2603255A1 CA 2603255 A1 CA2603255 A1 CA 2603255A1 CA 002603255 A CA002603255 A CA 002603255A CA 2603255 A CA2603255 A CA 2603255A CA 2603255 A1 CA2603255 A1 CA 2603255A1
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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 signal processing, said method comprising:
according to at least a lowband excitation signal and a plurality of lowband filter parameters, synthesizing a lowband speech signal;
generating a highband excitation signal based on the lowband excitation signal;
according to at least the highband excitation signal and a plurality of highband filter parameters, synthesizing a highband speech signal; and combining the lowband speech signal and the highband speech signal to obtain a wideband speech signal, wherein said generating a highband excitation signal includes applying a nonlinear function to a signal that is based on the lowband excitation signal to generate a spectrally extended signal, wherein the highband excitation signal is based on the spectrally extended signal.
according to at least a lowband excitation signal and a plurality of lowband filter parameters, synthesizing a lowband speech signal;
generating a highband excitation signal based on the lowband excitation signal;
according to at least the highband excitation signal and a plurality of highband filter parameters, synthesizing a highband speech signal; and combining the lowband speech signal and the highband speech signal to obtain a wideband speech signal, wherein said generating a highband excitation signal includes applying a nonlinear function to a signal that is based on the lowband excitation signal to generate a spectrally extended signal, wherein the highband excitation signal is based on the spectrally extended signal.
2. The method of signal processing according to claim 1, wherein said synthesizing a lowband speech signal includes synthesizing the lowband speech signal according to at least the lowband excitation signal and a plurality of linear prediction filter coefficients.
3. The method of signal processing according to claim 1, wherein said synthesizing a highband speech signal includes synthesizing the highband speech signal according to at least the highband excitation signal and a plurality of linear prediction filter coefficients.
4. The method of signal processing according to claim 1, wherein the nonlinear function is a memoryless nonlinear function.
5. The method of signal processing according to claim 1, wherein the nonlinear function is the absolute value function.
6. The method of signal processing according to claim 1, wherein said generating a highband excitation signal includes 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.
7. The method of signal processing according to claim 6, 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 lowband speech signal, the lowband excitation signal, and the spectrally extended signal.
8. The method of signal processing according to claim 1, said method comprising, prior to said combining, and according to a plurality of gain factors, modifying an amplitude of the highband speech signal over time.
9. The method of signal processing according to claim 8, wherein said modifying an amplitude of the highband speech signal comprises modifying, according to the plurality of gain factors, an amplitude over time of at least one among the lowband excitation signal, the spectrally extended signal, the highband excitation signal, and the highband speech signal.
10. A data storage medium having machine-executable instructions describing the method of signal processing according to claim 1.
11. An apparatus comprising:
a narrowband decoder configured to synthesize a lowband speech signal according to at least a lowband excitation signal and a plurality of lowband filter parameters;
a highband decoder configured to generate a highband excitation signal based on the lowband excitation signal and to synthesize a highband speech signal according to at least the highband excitation signal and a plurality of highband filter parameters; and a filter bank configured to combine the lowband speech signal and the highband speech signal to obtain a wideband speech signal, wherein said highband decoder is configured to apply a nonlinear function to a signal that is based on the lowband excitation signal to generate a spectrally extended signal, and wherein said highband decoder is configured to generate the highband excitation signal based on the spectrally extended signal.
a narrowband decoder configured to synthesize a lowband speech signal according to at least a lowband excitation signal and a plurality of lowband filter parameters;
a highband decoder configured to generate a highband excitation signal based on the lowband excitation signal and to synthesize a highband speech signal according to at least the highband excitation signal and a plurality of highband filter parameters; and a filter bank configured to combine the lowband speech signal and the highband speech signal to obtain a wideband speech signal, wherein said highband decoder is configured to apply a nonlinear function to a signal that is based on the lowband excitation signal to generate a spectrally extended signal, and wherein said highband decoder is configured to generate the highband excitation signal based on the spectrally extended signal.
12. The apparatus according to claim 11, wherein said narrowband decoder is configured to synthesize the lowband speech signal according to at least the lowband excitation signal and a plurality of linear prediction filter coefficients.
13. The apparatus according to claim 11, wherein said highband decoder is configured to synthesize the highband speech signal according to at least the highband excitation signal and a plurality of linear prediction filter coefficients.
14. The apparatus according to claim 11, wherein said highband decoder is configured to apply a memoryless nonlinear function to a signal that is based on the narrowband excitation signal to generate the spectrally extended signal.
15. The apparatus according to claim 11, wherein said highband decoder is configured to apply the absolute value function to a signal that is based on the lowband excitation signal to generate the spectrally extended signal.
16. The apparatus according to claim 11, wherein said highband decoder is configured to mix a signal that is based on the spectrally extended signal with a modulated noise signal, and wherein said highband decoder is configured to generate the highband excitation signal based on the mixed signal.
17. The apparatus according to claim 16, wherein said highband decoder is configured to perform modulation of a noise signal according to a time-domain envelope of a signal based on at least one among the lowband speech signal, the lowband excitation signal, and the spectrally extended signal, and wherein the modulated noise signal is based on a result of said modulation.
18. The apparatus according to claim 11, wherein said highband decoder is configured to modify an amplitude of the highband speech signal over time according to a plurality of gain factors.
19. The apparatus according to claim 18, wherein said highband decoder is configured to modify an amplitude of the highband speech signal according to a plurality of gain factors by modifying, according to the plurality of gain factors, an amplitude over time of at least one among the lowband excitation signal, the spectrally extended signal, the highband excitation signal, and the highband speech signal.
20. The apparatus according to claim 11, said apparatus comprising a cellular telephone.
21. The apparatus according to claim 11, 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 lowband excitation signal, the plurality of lowband filter parameters, and the plurality of highband filter parameters.
22. A method of signal processing, said method comprising:
processing a wideband speech signal to obtain a lowband speech signal and a highband speech signal;
encoding the lowband speech signal into at least an encoded lowband excitation signal and a plurality of lowband filter parameters;
generating a highband excitation signal based on the encoded lowband excitation signal;
according to the highband excitation signal, encoding the highband speech signal into at least a plurality of highband filter parameters; and wherein said generating a highband excitation signal includes applying a nonlinear function to a signal that is based on the encoded lowband excitation signal to generate a spectrally extended signal, wherein the highband excitation signal is based on the spectrally extended signal.
processing a wideband speech signal to obtain a lowband speech signal and a highband speech signal;
encoding the lowband speech signal into at least an encoded lowband excitation signal and a plurality of lowband filter parameters;
generating a highband excitation signal based on the encoded lowband excitation signal;
according to the highband excitation signal, encoding the highband speech signal into at least a plurality of highband filter parameters; and wherein said generating a highband excitation signal includes applying a nonlinear function to a signal that is based on the encoded lowband excitation signal to generate a spectrally extended signal, wherein the highband excitation signal is based on the spectrally extended signal.
23. The method of signal processing according to claim 22, wherein said encoding the lowband speech signal into at least an encoded lowband excitation signal and a plurality of lowband filter parameters includes encoding the lowband speech signal into at least an encoded lowband excitation signal and a plurality of linear prediction filter coefficients.
24. The method of signal processing according to claim 22, wherein said encoding the highband speech signal into at least a plurality of highband filter parameters includes encoding the highband speech signal into at least a plurality of linear prediction filter coefficients.
25. The method of signal processing according to claim 22, wherein the nonlinear function is a memoryless nonlinear function.
26. The method of signal processing according to claim 22, wherein the nonlinear function is the absolute value function.
27. The method of signal processing according to claim 22, wherein said generating the highband excitation signal based on the spectrally extended signal includes 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.
28. The method of signal processing according to claim 27, 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 lowband speech signal, the lowband excitation signal, and the spectrally extended signal.
29. The method of signal processing according to claim 22, said method comprising calculating a gain envelope according to a time-varying relation between the highband signal and a signal based on the lowband excitation signal.
30. The method of signal processing according to claim 29, wherein said calculating a gain envelope comprises:
based on the highband excitation signal and the plurality of highband filter parameters, generating a synthesized highband signal; and calculating a gain envelope according to a time-varying relation between the highband signal and the synthesized highband signal.
based on the highband excitation signal and the plurality of highband filter parameters, generating a synthesized highband signal; and calculating a gain envelope according to a time-varying relation between the highband signal and the synthesized highband signal.
31. A data storage medium having machine-executable instructions describing the method of signal processing according to claim 22.
32. An apparatus comprising:
a filter bank configured to filter a wideband speech signal to obtain a lowband speech signal and a highband speech signal;
a lowband encoder configured to encode the lowband speech signal into at least an encoded lowband excitation signal and a plurality of lowband filter parameters; and a highband encoder configured to generate a highband excitation signal based on the encoded lowband excitation signal, and to encode the highband speech signal, according to the highband excitation signal, into at least a plurality of highband filter parameters, wherein said highband encoder is configured to apply a nonlinear function to a signal that is based on the encoded lowband excitation signal to generate a spectrally extended signal, and wherein said highband decoder is configured to generate the highband excitation signal based on the spectrally extended signal.
a filter bank configured to filter a wideband speech signal to obtain a lowband speech signal and a highband speech signal;
a lowband encoder configured to encode the lowband speech signal into at least an encoded lowband excitation signal and a plurality of lowband filter parameters; and a highband encoder configured to generate a highband excitation signal based on the encoded lowband excitation signal, and to encode the highband speech signal, according to the highband excitation signal, into at least a plurality of highband filter parameters, wherein said highband encoder is configured to apply a nonlinear function to a signal that is based on the encoded lowband excitation signal to generate a spectrally extended signal, and wherein said highband decoder is configured to generate the highband excitation signal based on the spectrally extended signal.
33. The apparatus according to claim 32, wherein said narrowband encoder is configured to encode the lowband speech signal into at least an encoded lowband excitation signal and a plurality of linear prediction filter coefficients.
34. The apparatus according to claim 32, wherein said highband encoder is configured to encode the highband speech signal into at least a plurality of linear prediction filter coefficients.
35. The apparatus according to claim 32, wherein said highband encoder is configured to apply a memoryless nonlinear function to a signal that is based on the encoded lowband excitation signal to generate the spectrally extended signal.
36. The apparatus according to claim 32, wherein said highband encoder is configured to apply the absolute value function to a signal that is based on the encoded lowband excitation signal to generate the spectrally extended signal.
37. The apparatus according to claim 32, wherein said highband encoder is configured to mix a signal that is based on the spectrally extended signal with a modulated noise signal, and wherein said highband encoder is configured to generate the highband excitation signal based on the mixed signal.
38. The apparatus according to claim 37, wherein said highband encoder is configured to modulate a noise signal according to a time-domain envelope of a signal based on at least one among the lowband speech signal, the encoded lowband excitation signal, and the spectrally extended signal.
39. The apparatus according to claim 32, wherein said highband encoder is configured to calculate a gain envelope according to a time-varying relation between the highband signal and a signal based on the encoded lowband excitation signal.
40. The apparatus according to claim 39, wherein said highband encoder is configured to generate a synthesized highband signal based on the highband excitation signal and the plurality of highband filter parameters, and to calculate the gain envelope according to a time-varying relation between the highband signal and the synthesized highband signal.
41. The apparatus according to claim 32, said apparatus comprising a cellular telephone.
42. The apparatus according to claim 32, 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 encoded lowband excitation signal, the plurality of lowband filter parameters, and the plurality of highband filter parameters.
Applications Claiming Priority (5)
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US66790105P | 2005-04-01 | 2005-04-01 | |
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US67396505P | 2005-04-22 | 2005-04-22 | |
US60/673,965 | 2005-04-22 | ||
PCT/US2006/012235 WO2006107840A1 (en) | 2005-04-01 | 2006-04-03 | Systems, methods, and apparatus for wideband speech coding |
Publications (2)
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CA2603255A1 true CA2603255A1 (en) | 2006-10-12 |
CA2603255C CA2603255C (en) | 2015-06-23 |
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CA2602806A Active CA2602806C (en) | 2005-04-01 | 2006-04-03 | Methods and apparatus for encoding and decoding an highband portion of a speech signal |
CA2602804A Active CA2602804C (en) | 2005-04-01 | 2006-04-03 | Systems, methods, and apparatus for highband burst suppression |
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 |
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 |
CA2603255A Active CA2603255C (en) | 2005-04-01 | 2006-04-03 | Systems, methods, and apparatus for wideband speech coding |
CA2603229A Active CA2603229C (en) | 2005-04-01 | 2006-04-03 | Method and apparatus for split-band encoding of speech signals |
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CA2602806A Active CA2602806C (en) | 2005-04-01 | 2006-04-03 | Methods and apparatus for encoding and decoding an highband portion of a speech signal |
CA2602804A Active CA2602804C (en) | 2005-04-01 | 2006-04-03 | Systems, methods, and apparatus for highband burst suppression |
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 |
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 |
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CA2603229A Active CA2603229C (en) | 2005-04-01 | 2006-04-03 | Method and apparatus for split-band encoding of speech signals |
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JP (8) | JP5129115B2 (en) |
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CN (1) | CN102411935B (en) |
AT (4) | ATE492016T1 (en) |
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DE (4) | DE602006017050D1 (en) |
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SI (1) | SI1864282T1 (en) |
TW (8) | TWI319565B (en) |
WO (8) | WO2006107833A1 (en) |
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US9324333B2 (en) | 2006-07-31 | 2016-04-26 | Qualcomm Incorporated | Systems, methods, and apparatus for wideband encoding and decoding of inactive frames |
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