Pcm recording-regenerating device

TLDR: In this article, the authors proposed a method to obtain a high quality voice signal or digital data by converting an audio signal to a PCM digital signal, and recording and regenerating by frequency multiplexing outside the occupied bandwidth of a low carrier FM luminance signal and low-level conversion chromaticity signal.

Abstract: PURPOSE:To obtain a high quality voice signal or digital data by converting an audio signal to a PCM digital signal, and recording and regenerating by frequency multiplexing outside the occupied bandwidth of a low carrier FM luminance signal and low-level conversion chromaticity signal, or the gap of the occupied bandwidth of the both signals. CONSTITUTION:The audio signal from a terminal 2 is once converted to a digital signal in an A/D converter 20, is added a synchronizing signal and error code in a digital processing circuit 21, is performed an interleave, and is recorded on a video truck by the frequency multiplexing to the outside the occupied bandwidth of the low-level conversion chromaticity signal and low carrier FM luminance signal from recording signal spectrum or the gap between the occupied bandwidth of the both signals made by a modulation signal 22 and mixer 14. In regenerating, a voice modulation signal is taken out from the signal regenerated by video heads 16a and 16b. The original digital signal is demodulated in a demodulation circuit 42 and digital processing circuit 43, and the original voice signal is demodulated in a D/A converter. This eliminates the influence of distortion of a recording media, permitting high quality voice transmission.