AUDIO ENCODER ADOPTING A HIGH-SPEED ANALYTICAL FILTERING ALGORITHM AND AUDIO DECODER ADOPTING A HIGH-SPEED SYNTHETIC FILTERING ALGORITHM

摘要

Audio coder adopting a high speed analysis filtering algorithm and audio decoder adopting a high speed synthetic filtering algorithm. The encoder includes a matching unit (11) for classifying a received audio signal in a frequency band using the analysis algorithm, a psychoacoustic model (12) for assigning bits to each frequency band, a coding and quantizing unit (13) of said signal, and a frame compaction unit (14) producing bits from a signal output from the coding and quantizing unit (13). The decoder includes a frame decompacting unit (21) decompacting a signal from the binaries, an inverse decoding and quantizing unit (22) of said quantized signal, and a reverse time matching unit (23). inverse quantized signal using the synthesis algorithm.