KR950022304A - Quantization Method and Quantizer of Line Spectrum Frequency Vector - Google Patents
Quantization Method and Quantizer of Line Spectrum Frequency Vector Download PDFInfo
- Publication number
- KR950022304A KR950022304A KR1019930028792A KR930028792A KR950022304A KR 950022304 A KR950022304 A KR 950022304A KR 1019930028792 A KR1019930028792 A KR 1019930028792A KR 930028792 A KR930028792 A KR 930028792A KR 950022304 A KR950022304 A KR 950022304A
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- KR
- South Korea
- Prior art keywords
- vectors
- vector
- candidate
- separation
- quantized
- Prior art date
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Classifications
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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
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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
- G10L19/04—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
- G10L19/06—Determination or coding of the spectral characteristics, e.g. of the short-term prediction coefficients
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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
- G10L19/04—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
- G10L19/12—Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters the excitation function being a code excitation, e.g. in code excited linear prediction [CELP] vocoders
Abstract
디지탈 셀룰러 네트워크(DCN)에서 특정하게 응용되는 선 스펙트럼 주파수(LSF) 벡터 양자화기에는 코드 여기선형 예측(CELP)음성 엔코더들이 제공된다. LSF벡터 양자화기는 이용되는 비트의 관점에서 볼때는 효율적이고, 스피커와 핸드세트의 성능면에서 볼 때는 아주 효과적이고, 복잡성의 면에서 볼때는 알맞고, 효과적이며 간단한 통신 에러 검출 체계를 수용하고 있다. LSF벡터 양자화기는 최소의 비트를 이용하여 적당히 복잡하며, 전송에러를 퇴치하기 위한 에러 검출 능력을 갖고 있다. LSF벡터 양자화기를 각각의 카테고리에 대한 여러 다른 벡터 양자화된 테이블를 이용하여 비양자화된 선 스펙트럼 주파수들을 네개의 카테고리로 분류한다. 각각의 양자화 테이블은 특정 형태들의 벡터들에 대하여 최적화되어 있다. 각각의 카테고리에 대하여, 3개의 분리 벡터 코드북들은 간단한 에러 특정치를 분리 벡터들은 각각의 카테고리로 부터 27개의 벡터를 발생하기 위하여 조합된다. 이때 양자화기는 스피커와 핸드세트의 성능을 최적화시키기 위하여 복합 에러 측정치를 더 이용하여 최종적으로 최적의 카테고리를 선택한다. 2단계의 제한형 서치 절차 다음에 이루어지는, 분리 벡터 양자화로 인해 각각의 카테고리 내에 적당한 복잡도를 갖는 비양자화된 세트에 “밀접한”주문된 세트의 양자화된 선 스펙트럼 주파수가 얻어진다. 수신기에서 효과적이고 간단한 전송 에러 검출 기법은 벡터 양자화의 분리 성질과 제한형 서치 절차에 의해 가능해진다. 단지 26개의 비트만이 10개의 선 스펙트럼 주파수를 인코드하는데 필요하게 된다.Line spectrum frequency (LSF) vector quantizers that are specifically applied in digital cellular networks (DCNs) are provided with code excitation linear prediction (CELP) speech encoders. LSF vector quantizers are efficient in terms of the bits used, are very effective in terms of speaker and handset performance, and, in terms of complexity, accommodate a reasonable, effective and simple communication error detection scheme. LSF vector quantizers are moderately complex with minimal bits and have error detection capabilities to combat transmission errors. The LSF vector quantizer classifies the unquantized line spectral frequencies into four categories using different vector quantized tables for each category. Each quantization table is optimized for certain types of vectors. For each category, the three separate vector codebooks are simple error specification values and the separated vectors are combined to generate 27 vectors from each category. In this case, the quantizer finally selects an optimal category by further using complex error measurements to optimize the performance of the speaker and the handset. Separation vector quantization, followed by a two-step limited search procedure, yields a set of quantized line spectral frequencies that are "close" to the unquantized set of appropriate complexity within each category. An effective and simple transmission error detection technique at the receiver is made possible by the separation nature of the vector quantization and the limited search procedure. Only 26 bits are needed to encode 10 line spectral frequencies.
Description
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.
제1도는 전송될 분리 벡터들에 대한 부호 인덱스들을 선택하기 위해 전송기에서의 코드북 서치 절차를 도시하는 기능 블록도.1 is a functional block diagram illustrating a codebook search procedure at a transmitter to select sign indices for separation vectors to be transmitted.
제2도는 전송을 위한 최소 왜곡 분리 벡터 순차들을 선택하기 위해 한정된 선택 프로세스를 도시하는 기능 블록도.2 is a functional block diagram illustrating a limited selection process for selecting minimum distortion separation vector sequences for transmission.
제3도는 음성 통화 및 비음성 통화 구획들 각각에 대한 3-4-3 및 3-3-4 분리 벡터 양자화 방법을 사용하여 본 발명의 양호한 구현을 도시하는 블록도.3 is a block diagram illustrating a preferred implementation of the present invention using 3-4-3 and 3-3-4 separate vector quantization methods for voice and non-voice call partitions, respectively.
제4a도는 3-4-3 음성 통화 구획 서치에 대한 서치 절차를 도시하는 블록도.4A is a block diagram showing a search procedure for 3-4-3 voice call segment search.
제4b도는 3-3-4 비음성 통화 구획 서치에 대한 서치 절차를 도시하는 블록도.4B is a block diagram illustrating a search procedure for 3-3-4 non-voice call segment search.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
11, 12, 13, 14 : 코드북 15, 16, 17, 18 : 왜곡 계산기11, 12, 13, 14: Codebook 15, 16, 17, 18: Distortion Calculator
19 : 선택기19: selector
Claims (5)
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KR1019930028792A KR960015861B1 (en) | 1993-12-18 | 1993-12-18 | Quantizer & quantizing method of linear spectrum frequency vector |
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KR1019930028792A KR960015861B1 (en) | 1993-12-18 | 1993-12-18 | Quantizer & quantizing method of linear spectrum frequency vector |
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KR950022304A true KR950022304A (en) | 1995-07-28 |
KR960015861B1 KR960015861B1 (en) | 1996-11-22 |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100389898B1 (en) * | 1996-10-31 | 2003-10-17 | 삼성전자주식회사 | Method for quantizing linear spectrum pair coefficient in coding voice |
KR100446595B1 (en) * | 1997-04-29 | 2005-02-07 | 삼성전자주식회사 | Vector quantization method of line spectrum frequency using localization characteristics, especially searching optimum code book index using calculated distortion |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN102656629B (en) | 2009-12-10 | 2014-11-26 | Lg电子株式会社 | Method and apparatus for encoding a speech signal |
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1993
- 1993-12-18 KR KR1019930028792A patent/KR960015861B1/en not_active IP Right Cessation
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100389898B1 (en) * | 1996-10-31 | 2003-10-17 | 삼성전자주식회사 | Method for quantizing linear spectrum pair coefficient in coding voice |
KR100446595B1 (en) * | 1997-04-29 | 2005-02-07 | 삼성전자주식회사 | Vector quantization method of line spectrum frequency using localization characteristics, especially searching optimum code book index using calculated distortion |
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KR960015861B1 (en) | 1996-11-22 |
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