| 摘要 |
Improvement to the utilization of tape recorders, allowing by the speech action the automatic start and stop of such apparatus. The device uses the existing output plug of a cassette recorder, without introducing any modification whatsoever in the apparatus. It comprises a transistor amplifier (TR1, TR2, TR3) of which the input receives the modulation from a microphone (M); the output signals of the amplifier after detection by the diode (D1), command a flip-flop to a stable state comprised by an integrated circuit C MOS which provides a positive pulse controlling an electronic switch (TR4) triggering the automatic start-stop. Amongst the most interesting applications, are conference recordings, letter dictations, surveillance of premises, language studies, preparation to take the floor, without manipulating the manual control start-stop of the apparatus. |
