| 摘要 |
PROBLEM TO BE SOLVED: To provide a compression method and a compression apparatus which can enhance the compression rate of audio data for which real time characteristics are required. SOLUTION: An input signal a passing an input section 10 and an amplifier 15 is inputted to a compressor 100. The input signal a is subjected to ADPCM (Adaptive Differential Pulse Code Modulation) by an ADPCM encoder 20 and is made into a first compression signal b which is then subjected to entropy encoding by an entropy encoder 30 and is made into a second compression signal c. The second compression signal c is delivered through a transmission buffer 32 and a transmission section 34 to a transmission line 35 and is inputted through a reception section 36 and a reception buffer 38 to an expander 200. The second compression signal c inputted to an entropy encoder 40 and is subjected to entropy decoding and is made into a first expansion signal d which is then subjected to eADPCM decoding by an ADPCM decoder and is outputted as a second expansion signal e. The second expansion signal e is sounded loud through an amplifier 60 and an output section 70. COPYRIGHT: (C)2004,JPO
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