Coding Technologies Ab

Coding Technologies Sweden Ab

Per Rune Albin Ekstrand

Lars Gustaf Liljeryd

Lars Fredrik Henn

Hans Magnus Kristofer Kjorling

Hans Magnus Kristofer Kj&ouml;rling

Hans Magnus Kristofer Kjörling

The present invention proposes a new method and apparatus for the enhancement of source coding systems. The invention employs bandwidth reduction () prior to or in the encoder (), followed by spectral-band replication () at the decoder (). This is accomplished by the use of new transposition methods, in combination with spectral envelope adjustments. Reduced bitrate at a given perceptual quality or an improved perceptual quality at a given bitrate is offered. The invention is preferably integrated in a hardware or software codec, but can also be implemented as a separate processor in combination with a codec. The invention offers substantial improvements practically independent of codec type and technological progress.

Source coding enhancement using spectral-band replication

The present invention proposes a new method and apparatus for the enhancement of source coding systems. The invention employs bandwidth reduction () prior to or in the encoder (), followed by spectral-band replication () at the decoder (). This is accomplished by the use of new transposition methods, in combination with spectral envelope adjustments. Reduced bitrate at a given perceptual quality or an improved perceptual quality at a given bitrate is offered. The invention is preferably integrated in a hardware or software codec, but can also be implemented as a separate processor in combination with a codec. The invention offers substantial improvements practically independent f codec type and technological progress.

The present invention proposes a new method and apparatus for the enhancement of source coding systems. The invention employs bandwidth reduction prior to or in the encoder followed by spectral-band replication at the decoder This is accomplished by the use of new transposition methods, in combination with spectral envelope adjustments. Reduced bitrate at a given perceptual quality or an improved perceptual quality at a given bitrate is offered. The invention is preferably integrated in a hardware or software codec, but can also be implemented as a separate processor in combination with a codec. The invention offers substantial improvements practically independent of codec type and technological progress.

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Stockholm, Sweden

Per Rune Albin Ekstrand