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BRPI0306434A8 - Aparelho e método de decodificação de áudio - Google Patents

Aparelho e método de decodificação de áudio

Info

Publication number
BRPI0306434A8
BRPI0306434A8 BRPI0306434A BR0306434A BRPI0306434A8 BR PI0306434 A8 BRPI0306434 A8 BR PI0306434A8 BR PI0306434 A BRPI0306434 A BR PI0306434A BR 0306434 A BR0306434 A BR 0306434A BR PI0306434 A8 BRPI0306434 A8 BR PI0306434A8
Authority
BR
Brazil
Prior art keywords
high frequency
subband signals
aliasing
frequency subband
audio decoding
Prior art date
Application number
BRPI0306434A
Other languages
English (en)
Other versions
BR0306434A (pt
BRPI0306434B1 (pt
Inventor
Tanaka Naoya
Shimada Osamu
Tsushima Mineo
Norimatsu Takeshi
Seng Chong Kok
Hann Kuah Kim
Nomura Toshiyuki
Takamizawa Yuichiro
Serizawa Masahiro
Hong Neo Sua
Original Assignee
Nec Corp
Matsushita Electric Industrial Co Ltd
Panasonic 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, Matsushita Electric Industrial Co Ltd, Panasonic Corp filed Critical Nec Corp
Publication of BR0306434A publication Critical patent/BR0306434A/pt
Publication of BRPI0306434A8 publication Critical patent/BRPI0306434A8/pt
Publication of BRPI0306434B1 publication Critical patent/BRPI0306434B1/pt

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
    • G10L21/038—Speech enhancement, e.g. noise reduction or echo cancellation using band spreading techniques
    • 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
    • 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
    • G10L19/02—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 spectral analysis, e.g. transform vocoders or subband vocoders
    • G10L19/0204—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 spectral analysis, e.g. transform vocoders or subband vocoders using subband decomposition

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Computational Linguistics (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Human Computer Interaction (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Quality & Reliability (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Stereo-Broadcasting Methods (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)

Abstract

"APARELHO E MÉTODO DE DECODIFICAÇÃO DE ÁUDIO". A presente invenção refere-se a um aparelho de decodificação de áudio que decodifica sinais de componente de alta freqüência usando um expansor de banda que gera múltiplos sinais de sub-banda de freqüência alta a partir dos sinais de sub-banda de freqüência baixa divididos em múltiplas sub-bandas e uma informação codificada de freqüência alta transmitida. O aparelho é provido com um detector de serrilhado e um removedor de serrilhado. O detector de serrilhado detecta o grau de ocorrência de componentes de serrilhado nos múltiplos sinais de sub-banda de freqüência alta gerados pelo expansor de banda. O removedor de serrilhado suprime componentes de serrilhado nos sinais de sub-banda de freqüência alta pelo ajuste do ganho usado para a geração dos sinais de sub-banda de freqüência alta. Assim, uma ocorrência de serrilhado pode ser suprimida e a degradação resultante na qualidade do som pode ser reduzida, mesmo quando sinais de sub-banda de valor real forem usados, de modo a se reduzir o número de operações.
BRPI0306434-4A 2002-09-19 2003-09-11 Aparelho e método de decodificação de áudio BRPI0306434B1 (pt)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
JP2002-273557 2002-09-19
JP2002273557 2002-09-19
JP2002283722 2002-09-27
JP2002-283722 2002-09-27
JP2002-300490 2002-10-15
JP2002300490 2002-10-15
PCT/JP2003/011601 WO2004027368A1 (en) 2002-09-19 2003-09-11 Audio decoding apparatus and method

Publications (3)

Publication Number Publication Date
BR0306434A BR0306434A (pt) 2004-10-26
BRPI0306434A8 true BRPI0306434A8 (pt) 2017-10-10
BRPI0306434B1 BRPI0306434B1 (pt) 2018-06-12

Family

ID=32034073

Family Applications (1)

Application Number Title Priority Date Filing Date
BRPI0306434-4A BRPI0306434B1 (pt) 2002-09-19 2003-09-11 Aparelho e método de decodificação de áudio

Country Status (13)

Country Link
US (1) US7069212B2 (pt)
EP (1) EP1543307B1 (pt)
JP (1) JP3646939B1 (pt)
KR (1) KR100728428B1 (pt)
CN (1) CN100492492C (pt)
AT (1) ATE318405T1 (pt)
AU (1) AU2003260958A1 (pt)
BR (1) BRPI0306434B1 (pt)
CA (1) CA2469674C (pt)
DE (1) DE60303689T2 (pt)
ES (1) ES2259158T3 (pt)
TW (1) TWI313856B (pt)
WO (1) WO2004027368A1 (pt)

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US7069212B2 (en) 2006-06-27
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US20050149339A1 (en) 2005-07-07
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