| 摘要 |
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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