EP1100076A3 - Multimode speech encoder with gain smoothing - Google Patents

Multimode speech encoder with gain smoothing Download PDF

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Publication number
EP1100076A3
EP1100076A3 EP00124232A EP00124232A EP1100076A3 EP 1100076 A3 EP1100076 A3 EP 1100076A3 EP 00124232 A EP00124232 A EP 00124232A EP 00124232 A EP00124232 A EP 00124232A EP 1100076 A3 EP1100076 A3 EP 1100076A3
Authority
EP
European Patent Office
Prior art keywords
circuit
voice
smoothing
gain
excitation
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.)
Withdrawn
Application number
EP00124232A
Other languages
German (de)
French (fr)
Other versions
EP1100076A2 (en
Inventor
Kazunori Ozawa
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.)
NEC Corp
Original Assignee
NEC Corp
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
Application filed by NEC Corp filed Critical NEC Corp
Publication of EP1100076A2 publication Critical patent/EP1100076A2/en
Publication of EP1100076A3 publication Critical patent/EP1100076A3/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • G10L19/083—Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters the excitation function being an excitation gain

Abstract

A mode discriminating circuit (300) extracts a feature quantity from a voice signal and makes mode discrimination. When the output of the circuit (300) represents a predetermined mode, a smoothing circuit (450) executes time-wise smoothing of at least either one of excitation gain, adaptive codebook gain, spectral parameter and excitation signal level. A multiplexer (400) locally reproduces a synthesized signal by using a signal obtained through the smoothing, and feeds out a combination of the outputs of spectral parameter calculating circuit, mode discriminating circuit, adaptive codebook circuit, excitation quantizing circuit and gain quantizing circuit. Thus it makes possible to provide a voice coding and a voice decoding apparatus, which permit good coded sound quality to be obtained for voice with background noise superimposed thereon even at a low bit rate.
EP00124232A 1999-11-10 2000-11-09 Multimode speech encoder with gain smoothing Withdrawn EP1100076A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP31953499 1999-11-10
JP31953499A JP2001142499A (en) 1999-11-10 1999-11-10 Speech encoding device and speech decoding device

Publications (2)

Publication Number Publication Date
EP1100076A2 EP1100076A2 (en) 2001-05-16
EP1100076A3 true EP1100076A3 (en) 2003-12-10

Family

ID=18111328

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00124232A Withdrawn EP1100076A3 (en) 1999-11-10 2000-11-09 Multimode speech encoder with gain smoothing

Country Status (3)

Country Link
EP (1) EP1100076A3 (en)
JP (1) JP2001142499A (en)
CA (1) CA2325322A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008170488A (en) * 2007-01-06 2008-07-24 Yamaha Corp Waveform compressing apparatus, waveform decompressing apparatus, program and method for producing compressed data
PL2132731T3 (en) * 2007-03-05 2015-12-31 Ericsson Telefon Ab L M Method and arrangement for smoothing of stationary background noise
EP2077551B1 (en) * 2008-01-04 2011-03-02 Dolby Sweden AB Audio encoder and decoder
CN101615910B (en) * 2009-05-31 2010-12-22 华为技术有限公司 Method, device and equipment of compression coding and compression coding method
US8737602B2 (en) * 2012-10-02 2014-05-27 Nvoq Incorporated Passive, non-amplified audio splitter for use with computer telephony integration

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5267317A (en) * 1991-10-18 1993-11-30 At&T Bell Laboratories Method and apparatus for smoothing pitch-cycle waveforms
EP0731348A2 (en) * 1995-03-07 1996-09-11 Advanced Micro Devices, Inc. Voice storage and retrieval system
GB2312360A (en) * 1996-04-12 1997-10-22 Olympus Optical Co Voice Signal Coding Apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5267317A (en) * 1991-10-18 1993-11-30 At&T Bell Laboratories Method and apparatus for smoothing pitch-cycle waveforms
EP0731348A2 (en) * 1995-03-07 1996-09-11 Advanced Micro Devices, Inc. Voice storage and retrieval system
GB2312360A (en) * 1996-04-12 1997-10-22 Olympus Optical Co Voice Signal Coding Apparatus

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
MURASHIMA A ET AL: "A post-processing technique to improve coding quality of celp under background noise", 2000 IEEE WORKSHOP ON SPEECH CODING, 17 September 2000 (2000-09-17), pages 102 - 104, XP010520055 *
TANIGUCHI T ET AL: "Enhancement of VSELP Coded Speech under Background Noise", 1995 IEEE WORKSHOP ON SPEECH CODING FOR TELECOMMUNICATIONS, 20 September 1995 (1995-09-20), pages 67 - 68, XP010269480 *

Also Published As

Publication number Publication date
CA2325322A1 (en) 2001-05-10
JP2001142499A (en) 2001-05-25
EP1100076A2 (en) 2001-05-16

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