Digital audio transmission

摘要: @ A digital sub-band coder for audio signals provides adaptive allocation of bits to (eg) two sub-bands. Estimation the relative energy content bands is determined by reference only those which are always transmitted, so that decoding can take place without need transmission side information. Accompanying data may be transmitted in a fixed bit position, or insertion into lower band. In latter case, optionally duplicated both when their contents random. The invention applied embedded ADPCM coders.