| 摘要 |
<p>PURPOSE:To prevent the production of undesired noise by providing a separate gate circuit on the output side of a voice delay circuit provided on the output side of a gate circuit and using a squelch control signal to apply switching control to the gate circuit. CONSTITUTION:The output side of the gate circuit 207 in a ground station installation 200a is provided with a voice delay circuit 210 retarding a voice signal D by a generation delay time or so in a squelch control signal B, and a separate gate circuit 211 is provided on the output side of the voice delay circuit 210 and the gate circuit 211 is subjected to switching control by the squelch control signal B. Thus, till the final gate circuit 211 is closed, the voice signal D remains in existence. Thus, even when a generation delayed time exists in the squelch control signal B, undesired noise is not generated together with the interruption of a press-to-talk signal.</p> |
