CA2391562C - Gain-smoothing in wideband speech and audio signal decoder - Google Patents
Gain-smoothing in wideband speech and audio signal decoder Download PDFInfo
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- CA2391562C CA2391562C CA 2391562 CA2391562A CA2391562C CA 2391562 C CA2391562 C CA 2391562C CA 2391562 CA2391562 CA 2391562 CA 2391562 A CA2391562 A CA 2391562A CA 2391562 C CA2391562 C CA 2391562C
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; 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
- G10L19/08—Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters
- G10L19/083—Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters the excitation function being an excitation gain
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Abstract
The gain smoothing method and device modify the amplitude of an innovative codevector in relation to background noise present in a previously sampled wideband signal. The gain smoothing device comprises a gain smoothing calculator for calculating a smoothing gain in response to a factor representative of voicing in the sampled wideband signal, a factor representative of the stability of a set of linear prediction filter coefficients, and an innovative codebook gain. The gain smoothing device also comprises an amplifier for amplifying the innovative codevector with the smoothing gain to thereby produce a gain-smoothed innovative codevector. The function of the gain-smoothing device improves the perceived synthesized signal when background noise is present in the sampled wideband signal.
Claims (42)
1. A method for producing a gain-smoothed codevector during decoding of an encoded wideband signal from a set of signal encoding parameters, said method comprising:
finding a codevector in relation to at least one first signal encoding parameter of said set;
calculating a first factor representative of voicing in the wideband signal in response to at least one second signal encoding parameter of said set;
calculating a second factor representative of stability of said wideband signal in response to at least one third signal encoding parameter of said set;
calculating a smoothing gain in relation to said first and second factors; and amplifying the found codevector with said smoothing gain to thereby produce said gain-smoothed codevector.
finding a codevector in relation to at least one first signal encoding parameter of said set;
calculating a first factor representative of voicing in the wideband signal in response to at least one second signal encoding parameter of said set;
calculating a second factor representative of stability of said wideband signal in response to at least one third signal encoding parameter of said set;
calculating a smoothing gain in relation to said first and second factors; and amplifying the found codevector with said smoothing gain to thereby produce said gain-smoothed codevector.
2. A gain-smoothed codevector producing method as claimed in claim 1, wherein:
finding a codevector comprises finding an innovative codevector in an innovative codebook in relation to said at least one first signal encoding parameter; and the smoothing gain calculation comprises calculating the smoothing gain also in relation to an innovative codebook gain forming a fourth signal encoding parameter of said set.
finding a codevector comprises finding an innovative codevector in an innovative codebook in relation to said at least one first signal encoding parameter; and the smoothing gain calculation comprises calculating the smoothing gain also in relation to an innovative codebook gain forming a fourth signal encoding parameter of said set.
3. A gain-smoothed codevector producing method as claimed in claim 1, wherein:
finding a codevector comprises finding a codevector in a codebook in relation to said at least one first signal encoding parameter;
and said at least one first signal encoding parameter comprises an innovative codebook index.
finding a codevector comprises finding a codevector in a codebook in relation to said at least one first signal encoding parameter;
and said at least one first signal encoding parameter comprises an innovative codebook index.
4. A gain-smoothed codevector producing method as claimed in claim 1, wherein:
finding a codevector comprises finding an innovative codevector in an innovative codebook in relation to said at least one first signal encoding parameter; and said at least one second signal encoding parameter comprises the following parameters:
a pitch gain computed during encoding of the wideband signal;
a pitch delay computed during encoding of the wideband signal;
an index j of a low-pass filter selected during encoding of the wideband signal and.applied to a pitch codevector computed during encoding of the wideband signal; and an innovative codebook index computed during encoding of the wideband signal.
finding a codevector comprises finding an innovative codevector in an innovative codebook in relation to said at least one first signal encoding parameter; and said at least one second signal encoding parameter comprises the following parameters:
a pitch gain computed during encoding of the wideband signal;
a pitch delay computed during encoding of the wideband signal;
an index j of a low-pass filter selected during encoding of the wideband signal and.applied to a pitch codevector computed during encoding of the wideband signal; and an innovative codebook index computed during encoding of the wideband signal.
5. A gain-smoothed codevector producing method as claimed in claim 1, wherein said at least one third signal encoding parameter comprises coefficients of a linear prediction filter calculated during encoding of the wideband signal.
6. A gain-smoothed codevector producing method as claimed in claim 1, wherein:
finding a codevector comprises finding an innovative codevector in an innovative codebook in relation to an index k of said innovative codebook, said index k forming said at least one first signal encoding parameter; and calculating a first factor comprises computing a voicing factor rv by means of the following relation:
rv = (Ev - Ec) / (Ev + Ec) where:
- Ev is the energy of a scaled adaptive codevector bvT;
- Ec is the energy of a scaled innovative codevector gck;
- b is a pitch gain computed during encoding of the wideband signal;
- T is a pitch delay computed during encoding of the wideband signal;
- vT is an adaptive codebook vector at pitch delay T;
- g is an innovative codebook gain computed during encoding of the wideband signal;
- k is an index of the innovative codebook computed during encoding of the wideband signal; and - ck is the innovative codevector of said innovative codebook at index k.
finding a codevector comprises finding an innovative codevector in an innovative codebook in relation to an index k of said innovative codebook, said index k forming said at least one first signal encoding parameter; and calculating a first factor comprises computing a voicing factor rv by means of the following relation:
rv = (Ev - Ec) / (Ev + Ec) where:
- Ev is the energy of a scaled adaptive codevector bvT;
- Ec is the energy of a scaled innovative codevector gck;
- b is a pitch gain computed during encoding of the wideband signal;
- T is a pitch delay computed during encoding of the wideband signal;
- vT is an adaptive codebook vector at pitch delay T;
- g is an innovative codebook gain computed during encoding of the wideband signal;
- k is an index of the innovative codebook computed during encoding of the wideband signal; and - ck is the innovative codevector of said innovative codebook at index k.
7. A gain-smoothed codevector producing method as claimed in claim 6, wherein the voicing factor rv has a value located between -1 and 1, wherein value 1 corresponds to a pure voiced signal and value -1 corresponds to a pure unvoiced signals.
8. A gain-smoothed codevector producing method as claimed in claim 7, wherein calculating a first factor comprises computing a factor .lambda. using the following relation:
.lambda. = 0.5 (1 - rv).
.lambda. = 0.5 (1 - rv).
9. A gain-smoothed codevector producing method as claimed in claim 6, wherein a factor .lambda.=0 indicates a pure voiced signal and a factor .lambda.=1 indicates a pure unvoiced signal.
10. A gain-smoothed codevector producing method as claimed in claim 1, wherein calculating a second factor comprises determining a distance measure giving a similarity between adjacent, successive linear prediction filters computed during encoding of the wideband signal.
11. A gain-smoothed codevector producing method as claimed in claim 10, wherein:
the wideband signal is sampled prior to encoding, and is processed by frames during encoding and decoding; and determining a distance measure comprises calculating an Immitance Spectral Pair distance measure between the Immitance Spectral Pairs in a present frame n of the wideband signal and the Immitance Spectral Pairs of a past frame n-1 of the wideband signal through the following relation:
where p is the order of the linear prediction filters.
the wideband signal is sampled prior to encoding, and is processed by frames during encoding and decoding; and determining a distance measure comprises calculating an Immitance Spectral Pair distance measure between the Immitance Spectral Pairs in a present frame n of the wideband signal and the Immitance Spectral Pairs of a past frame n-1 of the wideband signal through the following relation:
where p is the order of the linear prediction filters.
12. A gain-smoothed codevector producing method as claimed in claim 11, wherein calculating a second factor comprises mapping the Immitance Spectral Pair distance measure Ds to said second factor .theta. through the following relation:
bounded by 0 <= .theta. <= 1.
bounded by 0 <= .theta. <= 1.
13. A gain-smoothed codevector producing method as claimed in claim 1, wherein calculating a smoothing gain comprises calculating a gain smoothing factor Sm based on both the first .lambda. and second .theta.
factors through the following relation:
S m=.lambda..theta.
factors through the following relation:
S m=.lambda..theta.
14. A gain-smoothed codevector producing method as claimed in claim 13, wherein the factor Sm has a value approaching 1 for an unvoiced and stable wideband signal, and a value approaching 0 for a pure voiced wideband signal or an unstable wideband signal.
15. A gain-smoothed codevector producing method as claimed in claim 1, wherein:
finding a codevector comprises finding an innovative codevector in an innovative codebook in relation to said at least one first signal encoding parameter;
the wideband signal is sampled prior to encoding, and is - processed by frames and subframes during encoding and decoding; and calculating a smoothing gain comprises computing an initial modified gain g0 by comparing an innovative codebook gain g computed during encoding of the wideband signal to a threshold given by the initial modified gain from the past subframe g-1 as follows:
if g<g-1 then g0=g × 1.19 bounded by g0 <= g-1 and if g >= g-1 then g0=g/1.19 bounded by g0 >= g-1.
finding a codevector comprises finding an innovative codevector in an innovative codebook in relation to said at least one first signal encoding parameter;
the wideband signal is sampled prior to encoding, and is - processed by frames and subframes during encoding and decoding; and calculating a smoothing gain comprises computing an initial modified gain g0 by comparing an innovative codebook gain g computed during encoding of the wideband signal to a threshold given by the initial modified gain from the past subframe g-1 as follows:
if g<g-1 then g0=g × 1.19 bounded by g0 <= g-1 and if g >= g-1 then g0=g/1.19 bounded by g0 >= g-1.
16. A gain-smoothed codevector producing method as claimed in claim 15, wherein calculating a smoothing gain comprises determining said smoothing gain through the following relation:
g s=S m*g0+(1-S m)*g
g s=S m*g0+(1-S m)*g
17. A method for producing a gain-smoothed codevector during decoding of an encoded wideband signal from a set of signal encoding parameters, said signal containing stationary background noise and said method comprising:
finding a codevector in relation to at least one first signal encoding parameter of said set;
calculating at least one factor indicative of stationary background noise in the signal in response to at least one second signal encoding parameter of said set;
calculating, in relation to said noise representative factor, a smoothing gain using a non linear operation; and amplifying the found codevector with said smoothing gain to thereby produce said gain-smoothed codevector.
finding a codevector in relation to at least one first signal encoding parameter of said set;
calculating at least one factor indicative of stationary background noise in the signal in response to at least one second signal encoding parameter of said set;
calculating, in relation to said noise representative factor, a smoothing gain using a non linear operation; and amplifying the found codevector with said smoothing gain to thereby produce said gain-smoothed codevector.
18. A method for producing a gain-smoothed codevector during decoding of an encoded wideband signal from a set of signal encoding parameters, said method comprising:
finding a codevector in relation to at least one first signal encoding parameter of said set;
calculating at least one factor indicative of stationary background noise in the signal in response to at least one second signal encoding parameter of said set, said at least one factor indibative of stationary background noise comprising a factor representative of voicing in the signal;
calculating, in relation to said at least one noise indicative factor including the voicing representative factor, a smoothing gain using a non linear operation; and amplifying the found codevector with said smoothing gain to thereby produce said gain-smoothed codevector.
finding a codevector in relation to at least one first signal encoding parameter of said set;
calculating at least one factor indicative of stationary background noise in the signal in response to at least one second signal encoding parameter of said set, said at least one factor indibative of stationary background noise comprising a factor representative of voicing in the signal;
calculating, in relation to said at least one noise indicative factor including the voicing representative factor, a smoothing gain using a non linear operation; and amplifying the found codevector with said smoothing gain to thereby produce said gain-smoothed codevector.
19. A method for producing a gain-smoothed codevector during decoding of an encoded wideband signal from a set of signal encoding parameters, said method comprising:
finding a codevector in relation to at least one first signal encoding parameter of said set;
calculating at least one factor indicative of stationary background noise in the signal in response to at least one second signal encoding parameter of said set, said at least one factor indicative of stationary background noise comprising a factor representative of stability of said wideband signal;
calculating, in relation to said at least one noise indicative factor including the stability representative factor, a smoothing gain using a non linear operation; and amplifying the found codevector with said smoothing gain to thereby produce said gain-smoothed codevector.
finding a codevector in relation to at least one first signal encoding parameter of said set;
calculating at least one factor indicative of stationary background noise in the signal in response to at least one second signal encoding parameter of said set, said at least one factor indicative of stationary background noise comprising a factor representative of stability of said wideband signal;
calculating, in relation to said at least one noise indicative factor including the stability representative factor, a smoothing gain using a non linear operation; and amplifying the found codevector with said smoothing gain to thereby produce said gain-smoothed codevector.
20. A device for producing a gain-smoothed codevector during decoding of an encoded wideband signal from a set of signal encoding parameters, said device comprising:
means for finding a codevector in relation to at least one first signal encoding parameter of said set;
means for calculating a first factor representative of voicing in the wideband signal in response to at least one second signal encoding parameter of said set;
means for calculating a second factor representative of stability of said wideband signal in response to at least one third signal encoding parameter of said set;
means for calculating a smoothing gain in relation to said first and second factors; and means for amplifying the found codevector with said smoothing gain to thereby produce said gain-smoothed codevector.
means for finding a codevector in relation to at least one first signal encoding parameter of said set;
means for calculating a first factor representative of voicing in the wideband signal in response to at least one second signal encoding parameter of said set;
means for calculating a second factor representative of stability of said wideband signal in response to at least one third signal encoding parameter of said set;
means for calculating a smoothing gain in relation to said first and second factors; and means for amplifying the found codevector with said smoothing gain to thereby produce said gain-smoothed codevector.
21. A gain-smoothed codevector producing device as claimed in claim 20, wherein:
the means for finding a codevector comprises means for finding an innovative codevector in an innovative codebook in relation to said at least one first signal encoding parameter; and the smoothing gain calculating means comprises means for calculating the smoothing gain also in relation to an innovative codebook gain forming a fourth signal encoding parameter of said set.
the means for finding a codevector comprises means for finding an innovative codevector in an innovative codebook in relation to said at least one first signal encoding parameter; and the smoothing gain calculating means comprises means for calculating the smoothing gain also in relation to an innovative codebook gain forming a fourth signal encoding parameter of said set.
22. A gain-smoothed codevector producing device as claimed in claim 20, wherein:
the means for finding a codevector comprises means for finding a codevector in a codebook in relation to said at least one first signal encoding parameter; and said at least one first signal encoding parameter comprises an innovative codebook index.
the means for finding a codevector comprises means for finding a codevector in a codebook in relation to said at least one first signal encoding parameter; and said at least one first signal encoding parameter comprises an innovative codebook index.
23. A gain-smoothed codevector producing device as claimed in claim 20, wherein:
the means for finding a codevector comprises means for finding an innovative codevector in an innovative codebook in relation to said at least one first signal encoding parameter; and said at least one second signal encoding parameter comprises the following parameters:
a pitch gain computed during encoding of the wideband signal;
a pitch delay computed during encoding of the wideband signal;
an index j of a low-pass filter selected during encoding of the wideband signal and applied to a pitch codevector computed during encoding of the wideband signal; and an innovative codebook index computed during encoding of the wideband signal.
the means for finding a codevector comprises means for finding an innovative codevector in an innovative codebook in relation to said at least one first signal encoding parameter; and said at least one second signal encoding parameter comprises the following parameters:
a pitch gain computed during encoding of the wideband signal;
a pitch delay computed during encoding of the wideband signal;
an index j of a low-pass filter selected during encoding of the wideband signal and applied to a pitch codevector computed during encoding of the wideband signal; and an innovative codebook index computed during encoding of the wideband signal.
24. A gain-smoothed codevector producing device as claimed in claim 20, wherein said at least one third signal encoding parameter comprises coefficients of a linear prediction filter calculated during encoding of the wideband signal.
25. A gain-smoothed codevector producing device as claimed in claim 20, wherein:
the means for finding a codevector comprises means for finding an innovative codevector in an innovative codebook in relation to an index k of said innovative codebook, said index k forming said at least one first signal encoding parameter; and the means for calculating a first factor comprises means for computing a voicing factor rv by means of the following relation:
rv = (Ev - Ec) / (Ev + Ec) where:
- Ev is the energy of a scaled adaptive codevector bvT;
- Ec is the energy of a scaled innovative codevector gck;
- b is a pitch gain computed during encoding of the wideband signal;
- T is a pitch delay computed during encoding of the wideband signal;
- vT is an adaptive codebook vector at pitch delay T;
- g is an innovative codebook gain computed during encoding of the wideband signal;
- k is an index of the innovative codebook computed during encoding of the wideband signal; and - ck is the innovative codevector of said innovative codebook at index k.
the means for finding a codevector comprises means for finding an innovative codevector in an innovative codebook in relation to an index k of said innovative codebook, said index k forming said at least one first signal encoding parameter; and the means for calculating a first factor comprises means for computing a voicing factor rv by means of the following relation:
rv = (Ev - Ec) / (Ev + Ec) where:
- Ev is the energy of a scaled adaptive codevector bvT;
- Ec is the energy of a scaled innovative codevector gck;
- b is a pitch gain computed during encoding of the wideband signal;
- T is a pitch delay computed during encoding of the wideband signal;
- vT is an adaptive codebook vector at pitch delay T;
- g is an innovative codebook gain computed during encoding of the wideband signal;
- k is an index of the innovative codebook computed during encoding of the wideband signal; and - ck is the innovative codevector of said innovative codebook at index k.
26. A gain-smoothed codevector producing device as claimed in claim 25, wherein the voicing factor rv has a value located between -1 and 1, wherein value 1 corresponds to a pure voiced signal and value -1 corresponds to a pure unvoiced signals.
27. A gain-smoothed codevector producing device as claimed in claim 26, wherein the means for calculating a first factor comprises means for computing a factor .lambda. using the following relation: -.lambda. = 0.5 (1 - rv).
28. A gain-smoothed codevector producing device as claimed in claim 27, wherein a factor .lambda.=0 indicates a pure voiced signal and a factor .lambda.=1 indicates a pure unvoiced signal.
29. A gain-smoothed codevector producing device as claimed in claim 20, wherein the means for calculating a second factor comprises means for determining a distance measure giving a similarity between adjacent, successive linear prediction filters computed during encoding of the wideband signal.
30. A gain-smoothed codevector producing device as claimed in claim 29, wherein:
the wideband signal is sampled prior to encoding, and is processed by frames during encoding and decoding; and the means for determining a distance measure comprises means for calculating an Immitance Spectral Pair distance measure between the Immitance Spectral Pairs in a present frame n of the wideband signal and the Immitance Spectral Pairs of a past frame n-1 of the wideband signal through the following relation:
where p is the order of the linear prediction filters.
the wideband signal is sampled prior to encoding, and is processed by frames during encoding and decoding; and the means for determining a distance measure comprises means for calculating an Immitance Spectral Pair distance measure between the Immitance Spectral Pairs in a present frame n of the wideband signal and the Immitance Spectral Pairs of a past frame n-1 of the wideband signal through the following relation:
where p is the order of the linear prediction filters.
31. A gain-smoothed codevector producing device as claimed in claim 30, wherein the means for calculating a second factor comprises means for mapping the Immitance Spectral Pair distance measure Ds to said second factor .theta. through the following relation:
.theta.=1.25 - D s / 400000.0 bounded by 0 <= .theta. <= 1.
.theta.=1.25 - D s / 400000.0 bounded by 0 <= .theta. <= 1.
32. A gain-smoothed codevector producing device as claimed in claim 20, wherein the means for calculating a smoothing gain comprises means for calculating a gain smoothing factor Sm based on both the first .lambda.
and second .theta.
factors through the following relation:
S m = .lambda..theta.
and second .theta.
factors through the following relation:
S m = .lambda..theta.
33. A gain-smoothed codevector producing device as claimed in claim 32, wherein the factor Sm has a value approaching 1 for an unvoiced and stable wideband signal, and a value approaching 0 for a pure voiced wideband signal or an unstable wideband signal.
34. A gain-smoothed codevector producing device as claimed in claim 20, wherein:
the means for finding a codevector comprises means for finding an innovative codevector in an innovative codebook in relation to said at least one first signal encoding parameter;
the wideband signal is sampled prior to encoding, and is processed by frames and subframes during encoding and decoding; and the means for calculating a smoothing gain comprises means for computing an initial modified gain g O , said initial modified gain computing means comprising means for comparing an innovative codebook gain g computed during encoding of the wideband signal to a threshold given by the initial modified gain from the past subframe g-1 as follows:
if g<g-1 then g O=g x 1.19 bounded by g O <= g-1 and if g >= g-1 then g O=g/1.19 bounded by g O >= g-1.
the means for finding a codevector comprises means for finding an innovative codevector in an innovative codebook in relation to said at least one first signal encoding parameter;
the wideband signal is sampled prior to encoding, and is processed by frames and subframes during encoding and decoding; and the means for calculating a smoothing gain comprises means for computing an initial modified gain g O , said initial modified gain computing means comprising means for comparing an innovative codebook gain g computed during encoding of the wideband signal to a threshold given by the initial modified gain from the past subframe g-1 as follows:
if g<g-1 then g O=g x 1.19 bounded by g O <= g-1 and if g >= g-1 then g O=g/1.19 bounded by g O >= g-1.
35. A gain-smoothed codevector producing method as claimed in claim 34, wherein the means for calculating a smoothing gain comprises means for determining said smoothing gain through the following relation:
g s=S m*g o+(1-S m)*g
g s=S m*g o+(1-S m)*g
36. A device for producing a gain-smoothed codevector during decoding of an encoded wideband signal from a set of signal encoding parameters, said signal containing stationary background noise and said device comprising:
means for finding a codevector in relation to at least one first signal encoding parameter of said set;
means for calculating at least one factor indicative of stationary background noise in the signal in response to at least one second signal encoding parameter of said set;
means for calculating, in relation to said noise representative factor, a smoothing gain using a non linear operation; and means for amplifying the found codevector with said smoothing gain to thereby produce said gain-smoothed codevector.
means for finding a codevector in relation to at least one first signal encoding parameter of said set;
means for calculating at least one factor indicative of stationary background noise in the signal in response to at least one second signal encoding parameter of said set;
means for calculating, in relation to said noise representative factor, a smoothing gain using a non linear operation; and means for amplifying the found codevector with said smoothing gain to thereby produce said gain-smoothed codevector.
37. A device for producing a gain-smoothed codevector during decoding of an encoded wideband signal from a set of signal encoding parameters, said device comprising:
means for finding a codevector in relation to at least one first signal encoding parameter of said set;
means for calculating at least one factor indicative of stationary background noise in the signal in response to at least one second signal encoding parameter of said set, said at least one factor indicative of stationary background noise comprising a factor representative of voicing in the signal;
means for calculating, in relation to said at least one noise indicative factor including the voicing representative factor, a smoothing gain using a non linear operation; and means for amplifying the found codevector with said smoothing gain to thereby produce said gain-smoothed codevector.
means for finding a codevector in relation to at least one first signal encoding parameter of said set;
means for calculating at least one factor indicative of stationary background noise in the signal in response to at least one second signal encoding parameter of said set, said at least one factor indicative of stationary background noise comprising a factor representative of voicing in the signal;
means for calculating, in relation to said at least one noise indicative factor including the voicing representative factor, a smoothing gain using a non linear operation; and means for amplifying the found codevector with said smoothing gain to thereby produce said gain-smoothed codevector.
38. A device for producing a gain-smoothed codevector during decoding of an encoded wideband signal from a set of signal encoding parameters, said device comprising:
means for finding a codevector in relation to at least one first signal encoding parameter of said set;
means for calculating at least one factor indicative of stationary background noise in the signal in response to at least one second signal encoding parameter of said set, said at least one factor indicative of stationary background noise comprising a factor representative of stability of said wideband signal;
means for calculating, in relation to said at least one noise indicative factor including the stability representative factor, a smoothing gain using a non linear operation; and means for amplifying the found codevector with said smoothing gain to thereby produce said gain-smoothed codevector.
means for finding a codevector in relation to at least one first signal encoding parameter of said set;
means for calculating at least one factor indicative of stationary background noise in the signal in response to at least one second signal encoding parameter of said set, said at least one factor indicative of stationary background noise comprising a factor representative of stability of said wideband signal;
means for calculating, in relation to said at least one noise indicative factor including the stability representative factor, a smoothing gain using a non linear operation; and means for amplifying the found codevector with said smoothing gain to thereby produce said gain-smoothed codevector.
39. A cellular communication system for servicing a geographical area divided into a plurality of cells, comprising:
mobile transmitter/receiver units;
cellular base stations respectively situated in said cells;
means for controlling communication between the cellular base stations;
a bidirectional wireless communication sub-system between each mobile unit situated in one cell and the cellular base station of said one cell, said bidirectional wireless communication sub-system comprising in both the mobile unit and the cellular base station (a) a transmitter including a decoder for encoding a wideband signal and means for transmitting the encoded wideband signal, and (b) a receiver including means for receiving a transmitted encoded wideband signal and a decoder for decoding the received encoded wideband signal;
wherein said decoder comprises means responsive to a set of signal encoding parameters for decoding the received encoded wideband signal, and wherein said wideband signal decoding means comprises a device as recited in any one of claims 20 to 38, for producing a gain-smoothed codevector during decoding of the encoded wideband signal from said set of signal encoding parameters.
mobile transmitter/receiver units;
cellular base stations respectively situated in said cells;
means for controlling communication between the cellular base stations;
a bidirectional wireless communication sub-system between each mobile unit situated in one cell and the cellular base station of said one cell, said bidirectional wireless communication sub-system comprising in both the mobile unit and the cellular base station (a) a transmitter including a decoder for encoding a wideband signal and means for transmitting the encoded wideband signal, and (b) a receiver including means for receiving a transmitted encoded wideband signal and a decoder for decoding the received encoded wideband signal;
wherein said decoder comprises means responsive to a set of signal encoding parameters for decoding the received encoded wideband signal, and wherein said wideband signal decoding means comprises a device as recited in any one of claims 20 to 38, for producing a gain-smoothed codevector during decoding of the encoded wideband signal from said set of signal encoding parameters.
40. A communication network element comprising a receiver including means for receiving a transmitted encoded wideband signal and a decoder for decoding the received encoded wideband signal;
wherein said decoder comprises means responsive to a set of signal encoding parameters for decoding the received encoded wideband signal, and wherein said wideband signal decoding means comprises a device as recited in any one of claims 20 to 38, for producing a gain-smoothed codevector during decoding of the encoded wideband signal from said set of signal encoding parameters.
wherein said decoder comprises means responsive to a set of signal encoding parameters for decoding the received encoded wideband signal, and wherein said wideband signal decoding means comprises a device as recited in any one of claims 20 to 38, for producing a gain-smoothed codevector during decoding of the encoded wideband signal from said set of signal encoding parameters.
41. A mobile transmitter/receiver unit comprising a receiver including means for receiving a transmitted encoded wideband signal and a decoder for decoding the received encoded wideband signal;
wherein said decoder comprises means responsive to a set of signal encoding parameters for decoding the received encoded wideband signal, and wherein said wideband signal decoding means comprises a device as recited in any one of claims 20 to 38, for producing a gain-smoothed codevector during decoding of the encoded wideband signal from said set of signal encoding parameters.
wherein said decoder comprises means responsive to a set of signal encoding parameters for decoding the received encoded wideband signal, and wherein said wideband signal decoding means comprises a device as recited in any one of claims 20 to 38, for producing a gain-smoothed codevector during decoding of the encoded wideband signal from said set of signal encoding parameters.
42. In a cellular communication system for servicing a geographical area divided into a plurality of cells, comprising: mobile transmitter/receiver units; cellular base stations respectively situated in said cells;
and means for controlling communication between the cellular base stations;
- a bidirectional wireless communication sub-system between each mobile unit situated in one cell and the cellular base station of said one cell, said bidirectional wireless communication sub-system comprising in both the mobile unit and the cellular base station (a) a transmitter including an encoder for encoding a wideband signal and means for transmitting the encoded wideband signal, and (b) a receiver including means for receiving a transmitted encoded wideband signal and a decoder for decoding the received encoded wideband signal;
wherein said decoder comprises means responsive to a set of signal encoding parameters for decoding the received encoded wideband signal, and wherein said wideband signal decoding means comprises a device as recited in any one of claims 20 to 38, for producing a gain-smoothed codevector during decoding of the encoded wideband signal from said set of signal encoding parameters.
and means for controlling communication between the cellular base stations;
- a bidirectional wireless communication sub-system between each mobile unit situated in one cell and the cellular base station of said one cell, said bidirectional wireless communication sub-system comprising in both the mobile unit and the cellular base station (a) a transmitter including an encoder for encoding a wideband signal and means for transmitting the encoded wideband signal, and (b) a receiver including means for receiving a transmitted encoded wideband signal and a decoder for decoding the received encoded wideband signal;
wherein said decoder comprises means responsive to a set of signal encoding parameters for decoding the received encoded wideband signal, and wherein said wideband signal decoding means comprises a device as recited in any one of claims 20 to 38, for producing a gain-smoothed codevector during decoding of the encoded wideband signal from said set of signal encoding parameters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2391562 CA2391562C (en) | 1999-11-18 | 2000-11-17 | Gain-smoothing in wideband speech and audio signal decoder |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2,290,037 | 1999-11-18 | ||
| CA002290037A CA2290037A1 (en) | 1999-11-18 | 1999-11-18 | Gain-smoothing amplifier device and method in codecs for wideband speech and audio signals |
| CA 2391562 CA2391562C (en) | 1999-11-18 | 2000-11-17 | Gain-smoothing in wideband speech and audio signal decoder |
| PCT/CA2000/001381 WO2001037264A1 (en) | 1999-11-18 | 2000-11-17 | Gain-smoothing in wideband speech and audio signal decoder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2391562A1 CA2391562A1 (en) | 2001-05-25 |
| CA2391562C true CA2391562C (en) | 2006-05-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2391562 Expired - Lifetime CA2391562C (en) | 1999-11-18 | 2000-11-17 | Gain-smoothing in wideband speech and audio signal decoder |
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| Country | Link |
|---|---|
| CA (1) | CA2391562C (en) |
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| Publication number | Publication date |
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| CA2391562A1 (en) | 2001-05-25 |
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