JPH1145100A5 - - Google Patents

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Publication number
JPH1145100A5
JPH1145100A5 JP1997162949A JP16294997A JPH1145100A5 JP H1145100 A5 JPH1145100 A5 JP H1145100A5 JP 1997162949 A JP1997162949 A JP 1997162949A JP 16294997 A JP16294997 A JP 16294997A JP H1145100 A5 JPH1145100 A5 JP H1145100A5
Authority
JP
Japan
Prior art keywords
noise gain
gain
filtering method
power
plus
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.)
Pending
Application number
JP1997162949A
Other languages
English (en)
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JPH1145100A (ja
Filing date
Publication date
Application filed filed Critical
Publication of JPH1145100A publication Critical patent/JPH1145100A/ja
Publication of JPH1145100A5 publication Critical patent/JPH1145100A5/ja
Pending legal-status Critical Current

Links

Description

【0030】
(9) 項8記載のフィルタリング方法に於て、α=0.8、β=0.5、μ=0.5×k(1)でk(1)が第1反射係数であるフィルタリング方法。
【0032】
(11) 項10記載のフィルタリング方法に於て、パワーが雑音利得に30dBを加えた値より大きければ、前記信号確率値が1であるフィルタリング方法。
(12) 項11記載のフィルタリング方法に於て、パワーが雑音利得に12dBを加えた値より小さければ、前記信号確率値が0であるフィルタリング方法。
(13) 項12記載のフィルタリング方法に於いて、パワーが雑音利得に12dBを加えた値より大きく、雑音利得に30dBを加えた値より小さい場合に、信号確率値を(対数利得−12−雑音利得)/18に等しいとするフィルタリング方法。
(14) 項10記載のフィルタリング方法に於て、α=0.8、β=0.5、μ=0.5×k(1)でk(1)が第1反射係数であるフィルタリング方法。 (15) 項14記載のフィルタリング方法に於て、対数利得が雑音利得に30dBを加えた値より大きければ、前記sig−probが1であるフィルタリング方法。
(16) 項15記載のフィルタリング方法に於て、対数利得が雑音利得に12dBを加えた値より小さければ、前記sig−probが0であるフィルタリング方法。
(17) 項16記載のフィルタリング方法に於いて、パワーが雑音利得に12dBを加えた値より大きく、雑音利得に30dBを加えた値より小さい場合に、前記sig−probを(対数利得−12−雑音利得)/18に等しいとするフィルタリング方法。
【0034】
(19) 項18記載の低ビット速度音声通信システムに於て、前記パワーが雑音利得に30dBを加えた値より大きければ、前記信号確率値si−probが1である低ビット速度音声通信システム。
(20) 項19記載の低ビット速度音声通信システムに於て、前記パワーが雑音利得に12dBを加えた値より小さければ、前記信号確率値sig−probが0である低ビット速度音声通信システム。
(21) 項20記載の低ビット速度音声通信システムに於て、前記パワーが雑音利得に12dBを加えた値より大きく、雑音利得に30dBを加えた値より小さければ、信号確率値sig−probを(対数利得−12−雑音利得)/18に等しいとする低ビット速度音声通信システム。
(22) 項18記載の低ビット速度音声通信システムに於て、βが0.5であり、αが0.8であり、k(1)を第1反射係数として、μが0.5×k(1)である低ビット速度音声通信システム。
(23) 項18記載の低ビット速度音声通信システムに於て、前記合成器が、LPC係数によって制御されるLPCフィルタを含む低ビット速度音声通信システム。
JP9162949A 1996-06-19 1997-06-19 フィルタリング方法と低ビット速度音声通信システム Pending JPH1145100A (ja)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US2033796P 1996-06-19 1996-06-19
US020337 1996-06-19

Publications (2)

Publication Number Publication Date
JPH1145100A JPH1145100A (ja) 1999-02-16
JPH1145100A5 true JPH1145100A5 (ja) 2005-03-17

Family

ID=21798075

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9162949A Pending JPH1145100A (ja) 1996-06-19 1997-06-19 フィルタリング方法と低ビット速度音声通信システム

Country Status (6)

Country Link
US (1) US5966689A (ja)
EP (1) EP0814458B1 (ja)
JP (1) JPH1145100A (ja)
KR (1) KR100421160B1 (ja)
DE (1) DE69730779T2 (ja)
TW (1) TW416044B (ja)

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US20020128839A1 (en) * 2001-01-12 2002-09-12 Ulf Lindgren Speech bandwidth extension
SE521693C3 (sv) * 2001-03-30 2004-02-04 Ericsson Telefon Ab L M En metod och anordning för brusundertryckning
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KR100630112B1 (ko) * 2002-07-09 2006-09-27 삼성전자주식회사 이동통신시스템의 적응형 채널 추정장치 및 방법
US20050071154A1 (en) * 2003-09-30 2005-03-31 Walter Etter Method and apparatus for estimating noise in speech signals
US8260611B2 (en) * 2005-04-01 2012-09-04 Qualcomm Incorporated Systems, methods, and apparatus for highband excitation generation
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KR101565919B1 (ko) 2006-11-17 2015-11-05 삼성전자주식회사 고주파수 신호 부호화 및 복호화 방법 및 장치
US20080120098A1 (en) * 2006-11-21 2008-05-22 Nokia Corporation Complexity Adjustment for a Signal Encoder
US20080249767A1 (en) * 2007-04-05 2008-10-09 Ali Erdem Ertan Method and system for reducing frame erasure related error propagation in predictive speech parameter coding
KR101597375B1 (ko) 2007-12-21 2016-02-24 디티에스 엘엘씨 오디오 신호의 인지된 음량을 조절하기 위한 시스템
US8842846B2 (en) * 2009-03-18 2014-09-23 Texas Instruments Incorporated Method and apparatus for polarity detection of loudspeaker
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