BR0009740A - Sistema para redução de ruìdos e método de processar um sinal de entrada ruidoso e um sinal de ruìdo para proporcionar um sinal de saìda de ruìdo reduzido, e respectivo telefone celular - Google Patents

Sistema para redução de ruìdos e método de processar um sinal de entrada ruidoso e um sinal de ruìdo para proporcionar um sinal de saìda de ruìdo reduzido, e respectivo telefone celular

Info

Publication number
BR0009740A
BR0009740A BR0009740-3A BR0009740A BR0009740A BR 0009740 A BR0009740 A BR 0009740A BR 0009740 A BR0009740 A BR 0009740A BR 0009740 A BR0009740 A BR 0009740A
Authority
BR
Brazil
Prior art keywords
noise
signal
mouth
spectral subtraction
microphone
Prior art date
Application number
BR0009740-3A
Other languages
English (en)
Inventor
Harald Gustafsson
Ingvar Claesson
Sven Nordholm
Original Assignee
Ericsson Telefon Ab L M
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 Ericsson Telefon Ab L M filed Critical Ericsson Telefon Ab L M
Publication of BR0009740A publication Critical patent/BR0009740A/pt

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers
    • H04R3/005—Circuits for transducers for combining the signals of two or more microphones

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Noise Elimination (AREA)

Abstract

"SISTEMA PARA REDUçãO DE RUìDOS E MéTODO DE PROCESSAR UM SINAL DE ENTRADA RUIDOSO E UM SINAL DE RUìDO PARA PROPORCIONAR UM SINAL DE SAìDA DE RUìDO REDUZIDO, E RESPECTIVO TELEFONE CELULAR". A otimização de voz é provida em sistemas de redução de ruído em microfones duplos pela inclusão de algoritmos de subtração espectral usando convolução linear, filtração causal e/ou mediação exponencial subordinada a espectro da função de ganho de subtração espectral. De acordo com concretizações típicas, quando um microfone distal da boca é usado em conjunção com um microfone proximal da boca, é possível tratar ruído de fundo não estacionário enquanto o espectro de ruído pode continuamente ser estimado a partir de um único bloco de amostras de entrada. O microfone distal da boca, além de captar o ruído de fundo, também capta a voz do usuário, embora a nível mais baixo que o microfone proximal da boca. Para otimizar a estimação de ruído, um estágio de subtração espectral é usado para suprimir a voz no sinal de microfone distal da boca. Para poder otimizar a estimação de ruído, uma estimação de voz grosseira é formada com outro estágio de subtração espectral proveniente do sinal proximal da boca. Finalmente, uma terceira função de subtração espectral é usada para otimizar o sinal proximal da boca suprimindo o ruído de fundo usando a estimação de ruído de fundo otimizada.
BR0009740-3A 1999-04-12 2000-04-11 Sistema para redução de ruìdos e método de processar um sinal de entrada ruidoso e um sinal de ruìdo para proporcionar um sinal de saìda de ruìdo reduzido, e respectivo telefone celular BR0009740A (pt)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/289,065 US6549586B2 (en) 1999-04-12 1999-04-12 System and method for dual microphone signal noise reduction using spectral subtraction
PCT/EP2000/003223 WO2000062579A1 (en) 1999-04-12 2000-04-11 System and method for dual microphone signal noise reduction using spectral subtraction

Publications (1)

Publication Number Publication Date
BR0009740A true BR0009740A (pt) 2002-01-08

Family

ID=23109892

Family Applications (1)

Application Number Title Priority Date Filing Date
BR0009740-3A BR0009740A (pt) 1999-04-12 2000-04-11 Sistema para redução de ruìdos e método de processar um sinal de entrada ruidoso e um sinal de ruìdo para proporcionar um sinal de saìda de ruìdo reduzido, e respectivo telefone celular

Country Status (12)

Country Link
US (1) US6549586B2 (pt)
EP (1) EP1169883B1 (pt)
JP (1) JP2002542689A (pt)
KR (1) KR20020005674A (pt)
CN (1) CN1175709C (pt)
AT (1) ATE232675T1 (pt)
AU (1) AU4399900A (pt)
BR (1) BR0009740A (pt)
DE (1) DE60001398T2 (pt)
HK (1) HK1047520B (pt)
MY (1) MY123423A (pt)
WO (1) WO2000062579A1 (pt)

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Also Published As

Publication number Publication date
EP1169883B1 (en) 2003-02-12
CN1356014A (zh) 2002-06-26
JP2002542689A (ja) 2002-12-10
HK1047520A1 (en) 2003-02-21
US6549586B2 (en) 2003-04-15
CN1175709C (zh) 2004-11-10
ATE232675T1 (de) 2003-02-15
US20010016020A1 (en) 2001-08-23
HK1047520B (zh) 2005-06-24
AU4399900A (en) 2000-11-14
DE60001398D1 (de) 2003-03-20
EP1169883A1 (en) 2002-01-09
KR20020005674A (ko) 2002-01-17
DE60001398T2 (de) 2003-09-04
MY123423A (en) 2006-05-31
WO2000062579A1 (en) 2000-10-19

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