ENCODING DEVICE, DECODING DEVICE, AND SOUND DATA DISTRIBUTION SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide an encoding device which can efficiently encode a sound signal over a wide band. SOLUTION: A sound data input part 310 of the encoding device 300 cuts 4096 pieces of successive sound data out of a sound data sequence and a conversion part 320 converts the cut sound data into spectrum data on the frequency axis. A data separation part 330 separates the spectrum data into a low-frequency part and a high-frequency part based upon 11.025 kHz (f1) as a border. The low-frequency part spectrum data are quantized and encoded by a 1st quantization part 340 and an encoding part 350 as usual. A 2nd encoding part 355 generates auxiliary information showing a feature of a high-frequency part frequency spectrum and a 2nd encoding part 355 encodes the auxiliary information. A stream output part 390 puts together and output the code obtained by the 1st encoding part 350 and the code obtained by the 2nd encoding part 355. Here, f1 is less than a half of the sampling frequency f2 when the sound data sequence was generated. COPYRIGHT: (C)2003,JPO