| 摘要 |
PURPOSE:To make one of plural receivers active to select channels, by receiving a broadcast having a tuning frequency corresponding to a channel selection switch operated by this active receiver. CONSTITUTION:During radio receiving, a power source 6 is given to a radio receiver 2, and the radio receiver 2 is made active. If a channel selection switc S11 of a TV receiver 1 is operated during radio receiver, the output from the S11 is given to a monostable circuit 13 through an AND gate 12. Meanwhile, the TV receiver 1 performs the channel selecting operation by the operation of the S11 and outputs a muting signal to a line 9 under the unlock state. This signal given to a monostable circuit 16 through an OR gate 15. Outputs from monostable circuit 13 and 16 are inputted to an NAND circuit 17, and an FF18 is set in response to the fall output from the gate 17 to turn on a transistor 19. Thus, a relay 7 is operated, and the power wource 6 is given to the TV receiver 1 through a contact 21, and a TV broadcast corresponding to the S11 is received. |
