Low bit rate encoder, low bit rate encoding method, low bit rates decoder, low bit rate decoding method for digital audio signals, and recording media on which signals coded by such encoder or encoding method are recorded

摘要

PURPOSE:To eliminate the redundancy of a bit distribution amount at the time of compression encoding in multichannel and to make compression encoding/ decoding high definition. CONSTITUTION:This device is constituted of an amplitude information detection circuit 200 detecting energy at every digital audio signals of plural channels, a bit distribution decision circuit 500 deciding the bit distribution amounts to respective channels based on the detection result, an encoder 400 compression encoding based on the bit distribution amount distributed at every channel according to the decision of the bit distribution amount and a formater 600 multiplexing a compression encoded signal at every channel, and the bit distribution amount decision circuit 500 is constituted so that the relation between the energy of the signal and the bit distribution amount becomes a nonlinear characteristic where the bit distribution amount is increased according to the increase of the energy of the signal as a whole.