| 摘要 |
PURPOSE:To completely prevent unnecessary sound with a simple constitution, by interrupting the output signal in the signal path of a radio receiver controlled with the output signal of the OR circuit using a switch. CONSTITUTION:The memory information of the memory units 9-1, 9-2 and 9-3 for frequency values of the broadcast station in digital coding, is read out with the channel selection switches 7-1,7-2,7-3 respectively, and is given to the entry unit 11 via the data multiplexer 10 as an input. The OR circuit 13 is connected to each output terminal of the switch 7-1 etc. and the entry unit 11 is controlled with the output signal of the OR circuit given via the delay circuit 20, entries the memory information corresponding to the switch 7-1, and interrupts the output signal in the signal path of the radio receiver controlled with the output signal of the circuit 13 by using the switch 14. Accordingly, unnecessary tone can completely be prevented with a simple constitution. |
