| 摘要 |
<p>PURPOSE:To allow recording of a retrieving code for each one recording even at the time of discontinuous recording such as an intermittent recording and to allow the execution of a retrieving operation at the time of reproduction by using the retrieving code comprised of combinations of single frequency. CONSTITUTION:By a switch B, at the time of a continuous recording, an audio signal part and a modulation part 7 are connected, and at the time of the discontinuous recording, a single frequency generator 12 and the modulation part 7 are connected. In the case of the latter, by the command from a micro-computer 4, the single frequency is recorded on the hi-fidelity track of a magnetic tape 9, and by the micro-computer 4, the retrieving codes are provided by making the combinations for each one field. At the time of the reproduction, signals are read from the tape 9 by an audio head 5, and the single frequency is taken out via a demodulator 8 and a circuit part 10. Then, the single frequency is converted to a voltage by a F/V converter 11 ; and by the micro-computer 4, the single frequency is detected from the voltage value, a counter value is reset by a blank recording, and in reading the subsequent signals the retrieving codes are read out.</p> |
