US5487128A
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Speech parameter coding method and appparatus
Assignee: NEC Corp
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Filing: 1992-02-26
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Granted: 1996-01-23
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Expires: 2012-02-26
Abstract
Abstract A speech parameter coding method and apparatus which can quantize a spectrum parameter of a speech signal with a smaller number of bits smaller than ever. A dividing section divides a predetermined order number of spectrum parameters, obtained by division of a speech signal into frames, for each order number of spectrum parameters smaller than the divisional order number. A vector quantizing section searches codebooks for the divided spectrum parameters for each order number and outputs a plurality of candidates of codevector in order of magnitude from the minimum one. An accumulated distortion calculating section calculates accumulated distortions for the entire order number for combinations of codevectors. A minimum judging section selectively outputs a combination of codevectors which minimizes the accumulated distortion thereby to quantize the spectrum parameter.
Inventors
- 👤 Kazunori Ozawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:32
CPC Classifications
G; G10; G10L; G10L19/00; G10L19/02; G10L19/032; G10L19/038; H; H03; H03M; H03M7/00; H03M7/30; H03M7/3082; G10L2019/0001; G10L2019/0004; G10L2019/0005
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
98 words
A speech parameter coding method, comprising the steps of: receiving an input speech signal; dividing the received speech signal into a plurality of frames each of a predetermined time length; finding spectrum parameters, each of which corresponds to first to P-th order, of the speech signal for each of the frames; dividing the spectrum parameters into a plural number of said spectrum parameters in accordance with their orders; searching a spectrum codebook for the divided spectrum parameters and calculating a distortion due to quantizing by use of codevectors in said codebook to obtain a plurality of candidate codevectors.
Claim 2
Dependent Claim
98 words
A speech parameter coding method, comprising the steps of: receiving an input speech signal; dividing the received speech signal into a plurality of frames each of a predetermined time length; finding spectrum parameters, each of which corresponds to first to P-th order, of the speech signal for each of the frames; dividing the spectrum parameters into a plural number of said spectrum parameters in accordance with their orders; searching a spectrum codebook for the divided spectrum parameters and calculating a distortion due to quantizing by use of codevectors in said codebook to obtain a plurality of candidate codevectors.
Claim 3
Dependent Claim
144 words
A speech parameter coding method, comprising the steps of: receiving an input speech signal; dividing the received speech signal into a plurality of frames; finding spectrum parameters, each of which corresponds to first to P-th order, of the speech signal for each of the frames; representing the spectrum parameters in a multi-stage cascade connection of a plurality of codebooks; obtaining a plurality of candidate codevectors at at least one of stages of the multi-stage cascade connection; dividing, at the other stage or at at least one of the other stages of the multi-stage cascade connection, the spectrum parameters into a plural member of said spectrum parameters in accordance with their orders; searching other codebooks for the divided spectrum parameters to obtain a plurality of candidates of codevectors; and selecting a combination of codevectors which minimizes an accumulated distortion thereby to quantize the spectrum parameters.
Claim 4
Dependent Claim
144 words
A speech parameter coding method, comprising the steps of: receiving an input speech signal; dividing the received speech signal into a plurality of frames; finding spectrum parameters, each of which corresponds to first to P-th order, of the speech signal for each of the frames; representing the spectrum parameters in a multi-stage cascade connection of a plurality of codebooks; obtaining a plurality of candidate codevectors at at least one of stages of the multi-stage cascade connection; dividing, at the other stage or at at least one of the other stages of the multi-stage cascade connection, the spectrum parameters into a plural member of said spectrum parameters in accordance with their orders; searching other codebooks for the divided spectrum parameters to obtain a plurality of candidates of codevectors; and selecting a combination of codevectors which minimizes an accumulated distortion thereby to quantize the spectrum parameters.
Claim 5
Dependent Claim
104 words
A speech parameter coding method, comprising the steps of: receiving an input speech signal; dividing the input speech signal into a plurality of frames; dividing each of the frames into a plurality of shorter subframes; finding spectrum parameters, each of which corresponds to first to P-th order, for the speech signal of at least one of the subframes; quantizing the spectrum parameters of at least one of the subframes using a first codebook constructed in advance; and quantizing parameters of the other subframe or at least of the other subframes using the quantized values and a second codebook constructed in advance or non-linear processing.
Claim 6
Dependent Claim
104 words
A speech parameter coding method, comprising the steps of: receiving an input speech signal; dividing the input speech signal into a plurality of frames; dividing each of the frames into a plurality of shorter subframes; finding spectrum parameters, each of which corresponds to first to P-th order, for the speech signal of at least one of the subframes; quantizing the spectrum parameters of at least one of the subframes using a first codebook constructed in advance; and quantizing parameters of the other subframe or at least of the other subframes using the quantized values and a second codebook constructed in advance or non-linear processing.
Claim 7
Dependent Claim
111 words
A speech parameter coding method, comprising the steps of: receiving an input speech signal; dividing the input speech signal into a plurality of frames; dividing each of the frames into a plurality of shorter subframes; finding spectrum parameters, each of which corresponds to first to P-th order, for the speech signal of at least one of the subframes; quantizing the spectrum parameters of at least one of the subframes using a first codebook constructed in advance; finding difference signals between the spectrum parameters of the other subframe or at least one of the other subframes and the quantized values; and quantizing the difference signals using a second codebook constructed in advance.
Claim 8
Dependent Claim
111 words
A speech parameter coding method, comprising the steps of: receiving an input speech signal; dividing the input speech signal into a plurality of frames; dividing each of the frames into a plurality of shorter subframes; finding spectrum parameters, each of which corresponds to first to P-th order, for the speech signal of at least one of the subframes; quantizing the spectrum parameters of at least one of the subframes using a first codebook constructed in advance; finding difference signals between the spectrum parameters of the other subframe or at least one of the other subframes and the quantized values; and quantizing the difference signals using a second codebook constructed in advance.
Claim 9
Dependent Claim
106 words
A speech parameter coding apparatus, comprising: means for dividing an input speech signal into a plurality of frames; means for finding spectrum parameters, each of which corresponds to first to P-th order, from the speech signal; means for vector quantizing the spectrum parameters to obtain vector quantized values; means for scalar quantizing difference signals between the spectrum parameters and the vector quantized values; and means for determining a predetermined order of quantizing ranges for the scalar quantization for each of a predetermined number of codevectors of said vector quantizing means so as to cause said scalar quantizing means to perform scalar quantization within the quantizing ranges.
Claim 10
Dependent Claim
106 words
A speech parameter coding apparatus, comprising: means for dividing an input speech signal into a plurality of frames; means for finding spectrum parameters, each of which corresponds to first to P-th order, from the speech signal; means for vector quantizing the spectrum parameters to obtain vector quantized values; means for scalar quantizing difference signals between the spectrum parameters and the vector quantized values; and means for determining a predetermined order of quantizing ranges for the scalar quantization for each of a predetermined number of codevectors of said vector quantizing means so as to cause said scalar quantizing means to perform scalar quantization within the quantizing ranges.
Claim 11
Dependent Claim
118 words
A speech parameter coding apparatus, comprising: means for dividing an input speech signal into a plurality of frames; means for finding a predetermined order number of spectrum parameters from the speech signal; means for vector quantizing the spectrum parameters; means for scalar quantizing difference signals between the spectrum parameters and the vector quantized values; means for producing a plurality of candidate quantizing values for each order number of the spectrum parameters at said scalar quantizing means; means for modifying, using each of the candidates, a quantizing range of an adjacent spectrum parameter; and means for accumulating a predetermined order number of quantizing distortions by the quantized values and producing a quantized value sequence which minimizes the accumulated distortion.
Claim 12
Dependent Claim
118 words
A speech parameter coding apparatus, comprising: means for dividing an input speech signal into a plurality of frames; means for finding a predetermined order number of spectrum parameters from the speech signal; means for vector quantizing the spectrum parameters; means for scalar quantizing difference signals between the spectrum parameters and the vector quantized values; means for producing a plurality of candidate quantizing values for each order number of the spectrum parameters at said scalar quantizing means; means for modifying, using each of the candidates, a quantizing range of an adjacent spectrum parameter; and means for accumulating a predetermined order number of quantizing distortions by the quantized values and producing a quantized value sequence which minimizes the accumulated distortion.
Claim 13
Dependent Claim
144 words
A speech parameter coding apparatus, comprising: means for dividing an input speech signal into a plurality of frames; means for finding a predetermined order number of spectrum parameters from the speech signal; means for vector quantizing the spectrum parameters; means for scalar quantizing difference signals between the spectrum parameters and the vector quantized values; means for determining a predetermined order number of quantizing ranges for the scalar quantization for each of a predetermined number of codevectors from said vector quantizing means; means for producing a plurality of candidate quantizing values for each order number of the spectrum parameters for the scalar quantization; means for modifying, using each of the candidates, a quantizing range of an adjacent spectrum parameter; and means for accumulating a predetermined order number of quantizing distortions by the quantizing values and producing a quantized value sequence which minimizes the accumulated distortion.
Claim 14
Dependent Claim
144 words
A speech parameter coding apparatus, comprising: means for dividing an input speech signal into a plurality of frames; means for finding a predetermined order number of spectrum parameters from the speech signal; means for vector quantizing the spectrum parameters; means for scalar quantizing difference signals between the spectrum parameters and the vector quantized values; means for determining a predetermined order number of quantizing ranges for the scalar quantization for each of a predetermined number of codevectors from said vector quantizing means; means for producing a plurality of candidate quantizing values for each order number of the spectrum parameters for the scalar quantization; means for modifying, using each of the candidates, a quantizing range of an adjacent spectrum parameter; and means for accumulating a predetermined order number of quantizing distortions by the quantizing values and producing a quantized value sequence which minimizes the accumulated distortion.
References Cited (Backward Citations)
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