| 摘要 |
PURPOSE:To prevent muting from being conducted due to a voice during communication by applying muting for a prescribed time only from the point of time of high frequency signal arrival in an FSK receiver. CONSTITUTION:A delay signal (g) goes to an H level while a high frequency signal is being received, resulting that a mute control signal (h) outputted from an AND circuit 19 goes to an H level while a data signal is received after an MPU 17 detects a bit synchronizing signal, the mute switch 12 is opened to apply muting. On the other hand, when the reception of a data signal is finished and the audio signal is received, since a noise squelch control signal (e) and a mute control signal (h) go both to an L level, the mute switches 11, 12 are both closed and the muting is released. As a result, even when a signal similar to the bit synchronizing signal is generated during communication, it is not intermitted.
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