MXPA02009683A - Codificacion de audio espectral, de multiples bandas. - Google Patents
Codificacion de audio espectral, de multiples bandas.Info
- Publication number
- MXPA02009683A MXPA02009683A MXPA02009683A MXPA02009683A MXPA02009683A MX PA02009683 A MXPA02009683 A MX PA02009683A MX PA02009683 A MXPA02009683 A MX PA02009683A MX PA02009683 A MXPA02009683 A MX PA02009683A MX PA02009683 A MXPA02009683 A MX PA02009683A
- Authority
- MX
- Mexico
- Prior art keywords
- indices
- frequency
- neighborhood
- short blocks
- index
- 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
Un codificador incluye un probador, que ensaya una senal de audio y que genera de las muestras una pluralidad de bloques cortos de audio probados. Cada uno de los bloques cortos tiene una duracion menor de un retardo minimo, el cual se puede percibir audiblemente. Un procesador combina la pluralidad de bloques cortos en un bloque largo. Este bloque largo se transforma en una senal de dominio de frecuencia, que tiene una pluralidad de indices de frecuencia, que se pueden modular independientemente. La diferencia de frecuencia entre los indices adyacentes se determina por la duracion minima y el regimen de ensayo del probador. Una proximidad de indices de frecuencia se selecciona, de modo que la diferencia de frecuencias entre el indice mas bajo y el indice mas alto, dentro de la proximidad, sea menor que un valor predeterminado. Dos o mas de los indices se modulan en la proximidad para asi hacer uno de los indices seleccionado un extremo, mientras mantiene la energia total de la proximidad constante. Una pluralidad de bandas de frecuencia son asi codificadas. Un descodificador decide que uno o mas bits han sido recibidos si, en una mayoria de bandas de frecuencia, este descodificador detecta un indice 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 |
---|---|
MXPA02009683A true MXPA02009683A (es) | 2004-09-06 |
Family
ID=24168239
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
MXPA02009683A MXPA02009683A (es) | 2000-04-06 | 2001-04-03 | Codificacion de audio espectral, de multiples bandas. |
Country Status (11)
Country | Link |
---|---|
US (2) | US6968564B1 (es) |
EP (1) | EP1269669B1 (es) |
JP (1) | JP2003530763A (es) |
CN (2) | CN1645774A (es) |
AU (3) | AU2001251274B2 (es) |
BR (1) | BR0107542A (es) |
CA (1) | CA2405179C (es) |
MX (1) | MXPA02009683A (es) |
NO (1) | NO20024778L (es) |
WO (1) | WO2001078271A2 (es) |
ZA (1) | ZA200207800B (es) |
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-
2000
- 2000-04-06 US US09/543,480 patent/US6968564B1/en not_active Expired - Lifetime
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2001
- 2001-04-03 WO PCT/US2001/010790 patent/WO2001078271A2/en active IP Right Grant
- 2001-04-03 AU AU2001251274A patent/AU2001251274B2/en not_active Ceased
- 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 CN CN01807789A patent/CN1422466A/zh active Pending
- 2001-04-03 BR BR0107542-0A patent/BR0107542A/pt not_active IP Right Cessation
- 2001-04-03 EP EP01924636.2A patent/EP1269669B1/en not_active Expired - Lifetime
- 2001-04-03 AU AU5127401A patent/AU5127401A/xx active Pending
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WO2001078271A3 (en) | 2002-07-04 |
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CN1645774A (zh) | 2005-07-27 |
CA2405179C (en) | 2014-07-08 |
ZA200207800B (en) | 2003-09-29 |
AU2001251274B2 (en) | 2004-11-25 |
EP1269669A2 (en) | 2003-01-02 |
AU2005200858B2 (en) | 2008-01-03 |
US20050177361A1 (en) | 2005-08-11 |
JP2003530763A (ja) | 2003-10-14 |
US6968564B1 (en) | 2005-11-22 |
WO2001078271A2 (en) | 2001-10-18 |
AU2005200858A1 (en) | 2005-03-17 |
CA2405179A1 (en) | 2001-10-18 |
CN1422466A (zh) | 2003-06-04 |
AU5127401A (en) | 2001-10-23 |
BR0107542A (pt) | 2003-01-14 |
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