Subband encoding and decoding system for data compression...

Details Subband encoding and decoding system for data compression... Subband encoding and decoding system for data compression...

H - Electricity

04

N

H04N 7/52 (2006.01) G06T 9/00 (2006.01) G10L 19/02 (2006.01) H04B 1/66 (2006.01) H04N 7/26 (2006.01) H04N 7/50 (2006.01)

Patent

CA 2314421

A subband encoding and a decoding system are provided. The subband encoding system measures signal levels of subband signals to determine scale factors to obtain scale factor information and produces bit allocation information based on the scale factor information, scale factor flag information indicating the fact that the scale factor information has changed from that one frame earlier, and updated scale factor information indicating the scale factor information which has changed from that one frame earlier. The subband encoding system re-quantizes the subband signals using the scale factor information and the bit allocation information to provide re-quantized output signals and constructs as an encoded output signal a frame made up of the re-quantized signals, the updated scale factor information, and the scale factor flag information. The number of subbands of the subband signals to be re-quantized is determined by an upper limit frequency of an audible band. This results in a decrease in operation load of the subband encoding and decoding systems.

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