Abstract :
A very high-quality sub-band ADPCM music coding scheme which compresses high-fidelity music signals, bandlimited to 15 kHz, to an equivalent PCM representation of only 4 bits per sample, is described. By processing music sampled at 32 kHz, this coder exhibits a total bit rate of only 128 kbit/s and is consequently applicable to the ISDN. Subjective tests conducted with this coder have shown that music recovered from the compression scheme is essentially indistinguishable from the original material. The results obtained are of major importance, not only for ISDN and broadcasting, but also for other digital audio technology such as compact disc (CD) and digital audio tape
Keywords :
Hi-Fi equipment; ISDN; acoustic signal processing; bandwidth compression; broadcasting; data compression; digital communication systems; encoding; music; pulse-code modulation; 128 kbit/s; 15 kHz; 4 bits per sample; ADPCM; CD; Hi-Fi technique; ISDN; broadcasting; compact disc; compression scheme; digital audio tape; digital audio technology; high-fidelity music signals; music coding; pulse code modulation; subband coding scheme;
