Method of and apparatus for coding audio signals

H - Electricity – 04 – B

Patent

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H04B 1/66 (2006.01)

Patent

CA 2234078

In coding of an audio signal, coded signals with low quality and bit rate on the one hand and coded signals with high quality and bit rate on the other hand are transmitted to a decoder. At first, the audio signal is coded with low bit rate and is transmitted to the decoder before an additional coded signal is transmitted to the decoder, which either alone or together with the first coded signal upon decoding thereof provides a decoded signal with high quality within the decoder. In this manner, a low-quality decoded signal is generated first in the decoder before decoding of the high-quality signal is possible.

Lors du codage d'un signal audio, sont transférés à un décodeur, d'une part, les signaux codés de faible qualité et de faible débit binaire et, d'autre part, les signaux codés de haute qualité et de débit binaire élevé. Le signal audio de faible débit binaire est tout d'abord codé et transféré au décodeur avant qu'un autre signal ne soit transféré au décodeur, lequel fournit seul ou conjointement avec le premier signal codé un signal décodé de haute qualité à l'intérieur du décodeur lors du décodage. Un signal décodé de faible qualité est ainsi produit dans le décodeur avant que le décodage du signal de haute qualité ne soit possible.

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