BR0107542A - Codificação de áudio espectral de banda múltipla - Google Patents
Codificação de áudio espectral de banda múltiplaInfo
- Publication number
- BR0107542A BR0107542A BR0107542-0A BR0107542A BR0107542A BR 0107542 A BR0107542 A BR 0107542A BR 0107542 A BR0107542 A BR 0107542A BR 0107542 A BR0107542 A BR 0107542A
- Authority
- BR
- Brazil
- Prior art keywords
- indices
- frequency
- index
- short blocks
- sampler
- Prior art date
Links
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/28—Arrangements for simultaneous broadcast of plural pieces of information
- H04H20/30—Arrangements for simultaneous broadcast of plural pieces of information by a single channel
- H04H20/31—Arrangements for simultaneous broadcast of plural pieces of information by a single channel using in-band signals, e.g. subsonic or cue signal
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
Abstract
"CODIFICAçãO DE áUDIO ESPECTRAL DE BANDA MúLTIPLA". Um codificador inclui um amostrador que amostra um sinal de áudio e que gera a partir das amostras uma pluralidade de blocos curtos de áudio amostrado. Cada um dos blocos curtos tem uma duração menor do que um atraso de sinal perceptível de forma audível mínimo. Um processador combina a pluralidade de blocos curtos em um bloco longo. O bloco longo é transformado em um sinal de domínio de freq³ência, que tem uma pluralidade de índices de freq³ência moduláveis de forma independente. A diferença de freq³ência entre os índices adjacentes é determinada pela duração mínima e pela taxa de amostragem do amostrador. Uma vizinhança de índices de freq³ência é selecionada, de modo que a diferença de freq³ência entre um índice mais baixo e um índice mais alto na vizinhança seja menor do que um valor predeterminado. Dois ou mais dos índices são modulados na vizinhança, de modo a tornar um índice selecionado dos índices um extremo, enquanto se mantém a energia total da vizinhança constante. Uma pluralidade de bandas de freq³ência, assim, é codificada. Um decodificador decide que um bit ou bits foi (foram) recebido(s), se, na maioria das bancos de dados, o decodificador detectar um índice modulado.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/543,480 US6968564B1 (en) | 2000-04-06 | 2000-04-06 | Multi-band spectral audio encoding |
PCT/US2001/010790 WO2001078271A2 (en) | 2000-04-06 | 2001-04-03 | System and method for adding an inaudible code to an audio signal and method and apparatus for reading a code signal from an audio signal |
Publications (1)
Publication Number | Publication Date |
---|---|
BR0107542A true BR0107542A (pt) | 2003-01-14 |
Family
ID=24168239
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
BR0107542-0A BR0107542A (pt) | 2000-04-06 | 2001-04-03 | Codificação de áudio espectral de banda múltipla |
Country Status (11)
Country | Link |
---|---|
US (2) | US6968564B1 (pt) |
EP (1) | EP1269669B1 (pt) |
JP (1) | JP2003530763A (pt) |
CN (2) | CN1645774A (pt) |
AU (3) | AU2005200858B2 (pt) |
BR (1) | BR0107542A (pt) |
CA (1) | CA2405179C (pt) |
MX (1) | MXPA02009683A (pt) |
NO (1) | NO20024778L (pt) |
WO (1) | WO2001078271A2 (pt) |
ZA (1) | ZA200207800B (pt) |
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2000
- 2000-04-06 US US09/543,480 patent/US6968564B1/en not_active Expired - Lifetime
-
2001
- 2001-04-03 MX MXPA02009683A patent/MXPA02009683A/es active IP Right Grant
- 2001-04-03 AU AU2005200858A patent/AU2005200858B2/en not_active Expired
- 2001-04-03 ZA ZA200207800A patent/ZA200207800B/xx unknown
- 2001-04-03 CN CNA2005100084652A patent/CN1645774A/zh active Pending
- 2001-04-03 CA CA2405179A patent/CA2405179C/en not_active Expired - Lifetime
- 2001-04-03 AU AU2001251274A patent/AU2001251274B2/en not_active Ceased
- 2001-04-03 EP EP01924636.2A patent/EP1269669B1/en not_active Expired - Lifetime
- 2001-04-03 WO PCT/US2001/010790 patent/WO2001078271A2/en active IP Right Grant
- 2001-04-03 BR BR0107542-0A patent/BR0107542A/pt not_active IP Right Cessation
- 2001-04-03 JP JP2001575015A patent/JP2003530763A/ja active Pending
- 2001-04-03 AU AU5127401A patent/AU5127401A/xx active Pending
- 2001-04-03 CN CN01807789A patent/CN1422466A/zh active Pending
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2002
- 2002-10-03 NO NO20024778A patent/NO20024778L/no not_active Application Discontinuation
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2005
- 2005-04-06 US US11/100,291 patent/US20050177361A1/en not_active Abandoned
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WO2001078271A2 (en) | 2001-10-18 |
AU2005200858A1 (en) | 2005-03-17 |
AU2005200858B2 (en) | 2008-01-03 |
ZA200207800B (en) | 2003-09-29 |
EP1269669A2 (en) | 2003-01-02 |
MXPA02009683A (es) | 2004-09-06 |
AU2001251274B2 (en) | 2004-11-25 |
CN1422466A (zh) | 2003-06-04 |
CA2405179A1 (en) | 2001-10-18 |
NO20024778D0 (no) | 2002-10-03 |
WO2001078271A3 (en) | 2002-07-04 |
US6968564B1 (en) | 2005-11-22 |
EP1269669B1 (en) | 2019-02-20 |
JP2003530763A (ja) | 2003-10-14 |
NO20024778L (no) | 2002-12-02 |
CN1645774A (zh) | 2005-07-27 |
AU5127401A (en) | 2001-10-23 |
US20050177361A1 (en) | 2005-08-11 |
CA2405179C (en) | 2014-07-08 |
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