KR100653932B1 - 음성부호화 방법, 음성부호화 장치와 그를 포함하는 이동통신기기 및 그를 포함하는 셀 방식 전화네트워크 - Google Patents
음성부호화 방법, 음성부호화 장치와 그를 포함하는 이동통신기기 및 그를 포함하는 셀 방식 전화네트워크 Download PDFInfo
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- 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
- G10L19/09—Long term prediction, i.e. removing periodical redundancies, e.g. by using adaptive codebook or pitch predictor
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- 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
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- 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
- G10L2019/0001—Codebooks
- G10L2019/0011—Long term prediction filters, i.e. pitch estimation
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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
- G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
- G10L25/03—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters
- G10L25/06—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters the extracted parameters being correlation coefficients
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Abstract
Description
EP 0 745 971은 입력 회화의 피치래그값을 추정하는 방법을 개시한다. 이 방법에 있어서, 입력 회화의 LPC잔여는 제1퓨리에변환에 의해 처리되어 주파수영역신호가 생성되고, 이것은 제곱되며 제2퓨리에변환에 의해 다른 영역(domain)으로 변환된다. 그러면 피치래그의 초기 추정치가 얻어질 수 있다. 그후에 시간영역 검색이 초기 추정치의 근처에서 수행되어 피치래그의 정확한 추정치가 산출된다.
US 5 327 520은 부호 여기된(excited) 선형 예측부호기를 개시한다. 이 부호기는 LPC잔여신호에 대한 피치래그 검색을 수행한다. 그 신호는 저역통과필터링된 다음 인자 4만큼 다운 샘플링되어, 추림된 LPC잔여샘플들이 생성된다. 추림된 LPC잔여샘플들은 피치래그의 초기 추정치를 얻도록 상호상관된다. 다음에, 추가의 상호상관(cross-correlation)이 초기 추정치의 근처에서의 추림되지 않은 LPC잔여에 대하여 수행되어 피치래그의 더 정확한 추정치가 얻어진다.
Claims (21)
- 샘플된 신호를 이 신호의 일련의 프레임들의 각각을 위한 피치-래그매개변수를 사용하여 음성부호화하는 방법에 있어서, 각 프레임을 위해,신호내의 프레임을 위한 자기상관함수를 미리 정의된 최대 및 최소 지연들 사이에서 결정하는 단계;이전 프레임을 위해 결정된 피치-래그매개변수 근처의 지연들을 위해 자기상관함수를 강조하기 위해 상기 자기상관함수를 가중시키는 단계; 및상기 가중된 자기상관함수의 최대에 대응하는 지연을 그 프레임을 위한 피치-래그매개변수로서 확인하는 단계를 포함하는 음성부호화 방법.
- 제 1항에 있어서, 상기 가중 단계에서,상기 자기상관함수는 개개의 이전 프레임들을 위해 결정된 복수개 피치래그들의 중간값 근처의 지연들을 위해 그 함수를 강조하도록 가중되는 음성부호화 방법.
- 제 4항에 있어서, 상기 가중함수는 상기 복수개 피치래그들의 표준편차에 역비례하는 인자의 산입에 의해 변경되는 음성부호화 방법.
- 제 1항 내지 제 5항 중 어느 한 항에 있어서, 상기 가중은 더 긴 지연시간들에 대하여 더 짧은 지연시간들을 추가로 강조하는 음성부호화 방법.
- 삭제
- 삭제
- 제 1항에 있어서,상기 프레임들은 말로 표명된 및 말로 표명되지 않은 프레임들로 분류되고,연속하는 말로 표명되지 않은 프레임들의 연속하는 시퀀스(sequence)가 수신된 후에, 가중치는 상기 시퀀스에서의 프레임들의 수에 실질적으로 비례하여 감소되는 음성부호화 방법.
- 샘플된 신호를 이 신호의 일련의 프레임들의 각각을 위한 피치-래그매개변수를 사용하여 음성부호화하는 장치에 있어서,각 프레임을 위해, 신호 내 프레임의 자기상관함수를 기설정된 최대 및 최소 지연들 사이에서 결정하는 수단(17);자기상관함수를 가중시켜 이전 프레임을 위해 결정된 피치-래그매개변수 근처의 지연들을 위해 그 함수를 강조하는 가중수단(19); 및가중된 자기상관함수의 최대에 해당하는 지연을 그 프레임을 위한 피치-래그매개변수로서 확인하는 수단(22)을 포함하는 음성부호화 장치.
- 삭제
- 제12항에 있어서,상기 가중 수단은 상기 자기상관함수를 소정수의 가중 함수 w(d)로 가중시키며, 상기 각 가중함수 w(d)에는 임계 레벨이 할당되며, 상기 가중 함수 w(d)들중의 특정한 하나를 선택하는 수단은, 적응적 항목이 그 임계 레벨을 초과할 때, 상기 자기상관함수를 가중시키도록 기능하는, 음성부호화 장치.
- 제 12항 또는 제14항의 장치를 포함하는 이동통신기기.
- 제 12항 또는 제14항에 따른 장치를 갖는 기지제어국을 포함하는 셀 방식 전화네트워크.
- 삭제
- 삭제
- 삭제
- 제1항에 있어서,상기 자기상관함수를 가중시키기 위한 소정수의 가중 함수 w(d)가 있고, 상기 각 가중함수 w(d)에는 임계 레벨이 할당되며, 적응적 항목이 그 임계레벨을 초과할 때 상기 가중 함수 w(d)들중의 특정한 하나가 선택되어, 상기 자기상관함수를 가중시키는데 이용되는, 음성부호화 방법.
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
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FI971976 | 1997-05-07 | ||
FI971976A FI971976A (fi) | 1997-05-07 | 1997-05-07 | Puhekoodaus |
FI980502 | 1998-03-05 | ||
FI980502A FI113903B (fi) | 1997-05-07 | 1998-03-05 | Puheen koodaus |
PCT/FI1998/000229 WO1998050910A1 (en) | 1997-05-07 | 1998-03-13 | Speech coding |
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KR1020047005340A Division KR100653926B1 (ko) | 1997-05-07 | 1998-03-13 | 음성부호화 방법, 음성부호화 장치와 그를 포함하는 이동통신기기 및 그를 포함하는 셀 방식 전화네트워크 |
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KR20010006394A KR20010006394A (ko) | 2001-01-26 |
KR100653932B1 true KR100653932B1 (ko) | 2006-12-04 |
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KR1020047005340A KR100653926B1 (ko) | 1997-05-07 | 1998-03-13 | 음성부호화 방법, 음성부호화 장치와 그를 포함하는 이동통신기기 및 그를 포함하는 셀 방식 전화네트워크 |
KR1019997009481A KR100653932B1 (ko) | 1997-05-07 | 1998-03-13 | 음성부호화 방법, 음성부호화 장치와 그를 포함하는 이동통신기기 및 그를 포함하는 셀 방식 전화네트워크 |
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KR1020047005340A KR100653926B1 (ko) | 1997-05-07 | 1998-03-13 | 음성부호화 방법, 음성부호화 장치와 그를 포함하는 이동통신기기 및 그를 포함하는 셀 방식 전화네트워크 |
Country Status (10)
Country | Link |
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US (1) | US6199035B1 (ko) |
EP (1) | EP0877355B1 (ko) |
JP (3) | JPH1124699A (ko) |
KR (2) | KR100653926B1 (ko) |
CN (1) | CN1120471C (ko) |
AU (1) | AU739238B2 (ko) |
DE (1) | DE69814517T2 (ko) |
ES (1) | ES2198615T3 (ko) |
FI (1) | FI113903B (ko) |
WO (1) | WO1998050910A1 (ko) |
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1998
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- 1998-03-13 KR KR1020047005340A patent/KR100653926B1/ko not_active IP Right Cessation
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- 1998-03-13 KR KR1019997009481A patent/KR100653932B1/ko not_active IP Right Cessation
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KR100653926B1 (ko) | 2006-12-05 |
FI980502A (fi) | 1998-11-08 |
FI980502A0 (fi) | 1998-03-05 |
ES2198615T3 (es) | 2004-02-01 |
KR20010006394A (ko) | 2001-01-26 |
AU739238B2 (en) | 2001-10-04 |
US6199035B1 (en) | 2001-03-06 |
FI113903B (fi) | 2004-06-30 |
JP2004038211A (ja) | 2004-02-05 |
JP4866438B2 (ja) | 2012-02-01 |
DE69814517D1 (de) | 2003-06-18 |
EP0877355A2 (en) | 1998-11-11 |
AU6403298A (en) | 1998-11-27 |
CN1120471C (zh) | 2003-09-03 |
CN1255226A (zh) | 2000-05-31 |
JP2009223326A (ja) | 2009-10-01 |
WO1998050910A1 (en) | 1998-11-12 |
JPH1124699A (ja) | 1999-01-29 |
EP0877355A3 (en) | 1999-06-16 |
DE69814517T2 (de) | 2004-04-08 |
KR20040037265A (ko) | 2004-05-04 |
EP0877355B1 (en) | 2003-05-14 |
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