1992 年 16 巻 71 号 p. 43-48
A system configuration of EDTV II audio which can provide high quality PCM sound service on terrestrial broadcasting is described. Original PCM sound data is compressed to about 1/6 using source coding, such as MPEG sub-band coding algorithm. The compressed data is arranged with error correction code and data spectrum is shaped by partial response coding. The data is transmitted via QAM (quadrature amplitude modulation) of a video carrier, that has data transmission bit rate from 300kbps to 1200kbps. We evaluated bit error rate of transmissions degraded by linear distortion, such as ghost, group delay distortion and demodulation phase error. The experimental results proved BER can be improved to 10^<-5>-10^<-7> by waveform equalization with 6dB D/U ghost or 30dB video S/N condition.