BRPI0507043A - método e aparelho para transformar um sinal de áudio digital e para inversamente transformar um sinal de áudio digital transformado - Google Patents

método e aparelho para transformar um sinal de áudio digital e para inversamente transformar um sinal de áudio digital transformado

Info

Publication number
BRPI0507043A
BRPI0507043A BRPI0507043-0A BRPI0507043A BRPI0507043A BR PI0507043 A BRPI0507043 A BR PI0507043A BR PI0507043 A BRPI0507043 A BR PI0507043A BR PI0507043 A BRPI0507043 A BR PI0507043A
Authority
BR
Brazil
Prior art keywords
transforming
audio signal
digital audio
transformation
conversely
Prior art date
Application number
BRPI0507043-0A
Other languages
English (en)
Inventor
Peter Georg Baum
Original Assignee
Thomson Licensing
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 Thomson Licensing filed Critical Thomson Licensing
Publication of BRPI0507043A publication Critical patent/BRPI0507043A/pt

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations
    • G06F17/14—Fourier, Walsh or analogous domain transformations, e.g. Laplace, Hilbert, Karhunen-Loeve, transforms
    • G06F17/147—Discrete orthonormal transforms, e.g. discrete cosine transform, discrete sine transform, and variations therefrom, e.g. modified discrete cosine transform, integer transforms approximating the discrete cosine transform
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations
    • G06F17/14—Fourier, Walsh or analogous domain transformations, e.g. Laplace, Hilbert, Karhunen-Loeve, transforms
    • G06F17/145—Square transforms, e.g. Hadamard, Walsh, Haar, Hough, Slant transforms
    • 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
    • G10L19/16—Vocoder architecture
    • G10L19/173—Transcoding, i.e. converting between two coded representations avoiding cascaded coding-decoding

Abstract

MéTODO E APARELHO PARA TRANSFORMAR UM SINAL DE áUDIO DIGITAL E PARA INVERSAMENTE TRANSFORMAR UM SINAL DE áUDIO DIGITAL TRANSFORMADO Uma transformação do domínio de tempo para o domínio de freqüência ou do domínio de freqüência para o domínio de tempo conhecida utilizada em codecs de ádudio é a MDCT, a qual tem a desvantagem de ser onerosa e termos de capacidade computacional requerida devido às multiplicações de alta precisão, mas que facilita sobrepor a transformação e a subamostragem. A invenção utiliza uma transformação ou transformação inversa que não envolve multiplicações porque as matrizes de transformação e de transformação inversa incluem somente valores `+1 e `-1 , mas por meio de qual as vantagens da sobreposiçao e da subamostragem são mantidas.
BRPI0507043-0A 2004-02-17 2005-02-04 método e aparelho para transformar um sinal de áudio digital e para inversamente transformar um sinal de áudio digital transformado BRPI0507043A (pt)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP04090051A EP1564650A1 (en) 2004-02-17 2004-02-17 Method and apparatus for transforming a digital audio signal and for inversely transforming a transformed digital audio signal
PCT/EP2005/001119 WO2005078600A1 (en) 2004-02-17 2005-02-04 Method and apparatus for transforming a digital audio signal and for inversely transforming a transformed digital audio signal

Publications (1)

Publication Number Publication Date
BRPI0507043A true BRPI0507043A (pt) 2007-06-12

Family

ID=34684728

Family Applications (1)

Application Number Title Priority Date Filing Date
BRPI0507043-0A BRPI0507043A (pt) 2004-02-17 2005-02-04 método e aparelho para transformar um sinal de áudio digital e para inversamente transformar um sinal de áudio digital transformado

Country Status (6)

Country Link
US (1) US7688711B2 (pt)
EP (2) EP1564650A1 (pt)
JP (1) JP4729505B2 (pt)
CN (1) CN100552669C (pt)
BR (1) BRPI0507043A (pt)
WO (1) WO2005078600A1 (pt)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3475944B1 (en) 2016-06-22 2020-07-15 Dolby International AB Audio decoder and method for transforming a digital audio signal from a first to a second frequency domain
CN106604199B (zh) * 2016-12-23 2018-09-18 湖南国科微电子股份有限公司 一种数字音频信号的矩阵处理方法及装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02113300A (ja) * 1988-10-24 1990-04-25 Fujitsu Ltd 音声符号伝送方法
FI100041B (fi) * 1995-12-29 1997-08-29 Nokia Telecommunications Oy Menetelmä signaalin ja kohinan laadun estimoimiseksi ja vastaanotin
SE519552C2 (sv) * 1998-09-30 2003-03-11 Ericsson Telefon Ab L M Flerkanalig signalkodning och -avkodning
DE10129240A1 (de) * 2001-06-18 2003-01-02 Fraunhofer Ges Forschung Verfahren und Vorrichtung zum Verarbeiten von zeitdiskreten Audio-Abtastwerten

Also Published As

Publication number Publication date
WO2005078600A1 (en) 2005-08-25
JP2007526508A (ja) 2007-09-13
CN1918563A (zh) 2007-02-21
US20070203695A1 (en) 2007-08-30
JP4729505B2 (ja) 2011-07-20
EP1564650A1 (en) 2005-08-17
US7688711B2 (en) 2010-03-30
EP1716506A1 (en) 2006-11-02
CN100552669C (zh) 2009-10-21

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Legal Events

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B08F Application fees: application dismissed [chapter 8.6 patent gazette]

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B08K Patent lapsed as no evidence of payment of the annual fee has been furnished to inpi [chapter 8.11 patent gazette]

Free format text: REFERENTE AO DESPACHO 8.6 PUBLICADO NA RPI 2260 DE 29/04/2014.