EP1930881A3 - Speech decoder employing noise compensation - Google Patents

Speech decoder employing noise compensation Download PDF

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Publication number
EP1930881A3
EP1930881A3 EP08152711A EP08152711A EP1930881A3 EP 1930881 A3 EP1930881 A3 EP 1930881A3 EP 08152711 A EP08152711 A EP 08152711A EP 08152711 A EP08152711 A EP 08152711A EP 1930881 A3 EP1930881 A3 EP 1930881A3
Authority
EP
European Patent Office
Prior art keywords
speech
voice
encoder
bit rate
decoder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP08152711A
Other languages
German (de)
French (fr)
Other versions
EP1930881A2 (en
Inventor
Jes Thyssen
Huan-Yu Su
Yang Gao
Adil Benyassine
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung Electronics Co Ltd
Original Assignee
Mindspeed Technologies LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US09/154,662 external-priority patent/US6493665B1/en
Priority claimed from US09/156,832 external-priority patent/US6823303B1/en
Priority claimed from US09/198,414 external-priority patent/US6240386B1/en
Priority to EP09152356A priority Critical patent/EP2088585A1/en
Priority to EP10180379A priority patent/EP2259255A1/en
Priority to EP09152359A priority patent/EP2088587A1/en
Priority to EP09152360A priority patent/EP2085966A1/en
Application filed by Mindspeed Technologies LLC filed Critical Mindspeed Technologies LLC
Priority to EP09152357A priority patent/EP2088586A1/en
Priority to EP09152354A priority patent/EP2088584A1/en
Publication of EP1930881A2 publication Critical patent/EP1930881A2/en
Publication of EP1930881A3 publication Critical patent/EP1930881A3/en
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • G10L21/00—Speech or voice signal processing techniques 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
    • G10L21/0316—Speech enhancement, e.g. noise reduction or echo cancellation by changing the amplitude
    • G10L21/0364—Speech enhancement, e.g. noise reduction or echo cancellation by changing the amplitude for improving intelligibility
    • 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
    • G10L21/00—Speech or voice signal processing techniques 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computational Linguistics (AREA)
  • Quality & Reliability (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

A multi-rate speech codec supports a plurality of encoding bit rate modes by adaptively selecting encoding bit rate modes to match communication channel restrictions. In higher bit rate encoding modes, an accurate representation of speech through CELP (code excited linear prediction) and other associated modeling parameters are generated for higher quality decoding and reproduction. For each bit rate mode selected, pluralities of fixed or innovation subcodebooks are selected for use in generating innovation vectors. The speech coder distinguishes various voice signals as a function of their voice content. For example, a Voice Activity Detection (VAD) algorithm selects an appropriate coding scheme depending on whether the speech signal comprises active or inactive speech. The encoder may consider varying characteristics of the speech signal including sharpness, a delay correlation, a zero-crossing rate, and a residual energy. In another embodiment of the present invention, code excited linear prediction is used for voice active signals whereas random excitation is used for voice inactive signals; the energy level and spectral content of the voice inactive signal may also be used for noise coding. The multi-rate speech codec may employ distributed detection and compensation processing the speech signal. For high quality perceptual speech reproduction, the speech codec may perform noise detection in both an encoder and decoder. The noise detection may be coordinated between the encoder and decoder. Similarly, noise compensation may be performed in a distributed manner among both the decoder and the encoder.
EP08152711A 1998-08-24 1999-08-24 Speech decoder employing noise compensation Ceased EP1930881A3 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP09152354A EP2088584A1 (en) 1998-08-24 1999-08-24 Codebook sharing for LSF quantization
EP09152357A EP2088586A1 (en) 1998-08-24 1999-08-24 Adaptive codebook gain control for speech coding
EP09152356A EP2088585A1 (en) 1998-08-24 1999-08-24 Gain smoothing for speech coding
EP10180379A EP2259255A1 (en) 1998-08-24 1999-08-24 Speech encoding method and system
EP09152359A EP2088587A1 (en) 1998-08-24 1999-08-24 Open-loop pitch processing for speech coding
EP09152360A EP2085966A1 (en) 1998-08-24 1999-08-24 Selection of scalar quantization(SQ) and vector quantization (VQ) for speech coding

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US9756998P 1998-08-24 1998-08-24
US15465798A 1998-09-18 1998-09-18
US09/154,662 US6493665B1 (en) 1998-08-24 1998-09-18 Speech classification and parameter weighting used in codebook search
US09/156,832 US6823303B1 (en) 1998-08-24 1998-09-18 Speech encoder using voice activity detection in coding noise
US09/198,414 US6240386B1 (en) 1998-08-24 1998-11-24 Speech codec employing noise classification for noise compensation
EP99946655A EP1110209B1 (en) 1998-08-24 1999-08-24 Spectrum smoothing for speech coding

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP99946655A Division EP1110209B1 (en) 1998-08-24 1999-08-24 Spectrum smoothing for speech coding

Related Child Applications (5)

Application Number Title Priority Date Filing Date
EP09152354A Division EP2088584A1 (en) 1998-08-24 1999-08-24 Codebook sharing for LSF quantization
EP09152357A Division EP2088586A1 (en) 1998-08-24 1999-08-24 Adaptive codebook gain control for speech coding
EP09152359A Division EP2088587A1 (en) 1998-08-24 1999-08-24 Open-loop pitch processing for speech coding
EP09152360A Division EP2085966A1 (en) 1998-08-24 1999-08-24 Selection of scalar quantization(SQ) and vector quantization (VQ) for speech coding
EP09152356A Division EP2088585A1 (en) 1998-08-24 1999-08-24 Gain smoothing for speech coding

Publications (2)

Publication Number Publication Date
EP1930881A2 EP1930881A2 (en) 2008-06-11
EP1930881A3 true EP1930881A3 (en) 2008-09-17

Family

ID=39362821

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08152711A Ceased EP1930881A3 (en) 1998-08-24 1999-08-24 Speech decoder employing noise compensation

Country Status (1)

Country Link
EP (1) EP1930881A3 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113630120A (en) * 2021-03-31 2021-11-09 中山大学 Zero-time-delay communication method combined with 1-bit analog-to-digital converter and application thereof
CN113598734A (en) * 2021-07-28 2021-11-05 厦门大学 Cuff-free blood pressure prediction method based on deep neural network model
CN117423348B (en) * 2023-12-19 2024-04-02 山东省计算中心（国家超级计算济南中心） Speech compression method and system based on deep learning and vector prediction

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
TANIGUCHI T ET AL: "Enhancement of VSELP Coded Speech under Background Noise", 19950920; 19950920 - 19950922, 20 September 1995 (1995-09-20), pages 67 - 68, XP010269480 *

Also Published As

Publication number Publication date
EP1930881A2 (en) 2008-06-11

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