The Tokyo Electric Power Company, Incorporated

Other

Moritada Niitsu

Tsutomu Oohashi

A disc recording device for recording left channel signals and right channel signals having a super audio-frequency signal range up to 40 kHz on a left master disc and a right master disc respectively comprises a left disc recording control portion, a right disc recording control portion, and a common control portion. An another disc recording device for recording the left channel signals and the right channel signals having sounds of super audio-frequency signal range up to 40 kHz onto one face and other face of a master disc respectively comprises a disc inverse face playback control portion, a disc front face playback control portion, and a common control portion. A signal frame as a channel bit used in the above mentioned devices has 316 bits per one left channel signal and one right channel signal, respectively.

Synchronous recording and playback of left and right stereo channels on

A multitrack audio system having rotary heads by which audio signals are recorded onto a plurality of tracks and played back from the tracks on a magnetic tape comprises a track grouping circuit for dividing the tracks into track groups having the predetermined number of tracks; a type switching circuit for selecting the track groups; a first to fourth clock oscillators for generating sampling frequencies; a first circuit group which comprises a S/H circuit 15, and A/D conversion circuit, a 10-8 conversion circuit 19, and error detection/correction code additional circuit 21, and a time axis compression circuit 23 for converting the audio signals to digital signals; a modulator; a recording and playback circuit; a demodulator; a switching circuit for selecting the track group as an object of playback; and a second circuit group, which comprises a time axis re-expansion circuit, a error detection/correction circuit, a 8-10 conversion circuit, an interpolation circuit, and D/A conversion circuits for converting the digital signals demodulated by the demodulator into audio signals selected by the switching circuit.

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Tokyo, Japan

Moritada Niitsu