| 摘要 |
<p>PURPOSE:To make it possible to perform the radio remote operation of sound generation through a wireless microphone by turning on-off a recording, reproduction part by turns every time a carrier from the wireless microphone is received. CONSTITUTION:While no input arrives at antenna 1, intermediate amplification stage 4 generates no output, recording, reproduction part 8 is held on stand-by and stop-state indicating lamp 27 stays on. Once an input is applied to antenna 1, the output of the differentiating circuit is inputted to bistable multivibrator 14 to invert multivibrator 14 and as the collector current of transistor TR20 increases, relay 22 is put into operation to drive motor 26 for tape drive, thereby placing reproducting part 8 in recording mode. To stop the tape drive, the input to multivibrator 14 is temporarily interrupted when oscillation starts after the carrier is temporariy cut off and then it is inputted again to invert the multivibrator. As a result, the relay is turned off and the motor stops operating, thereby turning on lamp 27. In this case, superposing a sound on the carrier permits this device to serve as a loudspeaker through speaker 7.</p> |
