| 摘要 |
PURPOSE:To receive a double broadcast signal in monaural reception mode and to prevent a failure in sound recording to an error in reception setting by providing a changeover switch which outputs a switching signal when operated and an FF which is set and reset repeatedly by every time said signal is inputted. CONSTITUTION:A switching circuit 15 is connected to a control signal detection part 7 which detects a stereophonic or double broadcast signal, and a changeover switch S1 which when operated, outputs a switching signal A is connected to said circuit 15. This circuit 15 connects with a shift register 17 which changes reception mode by applying a switching signal A' to a matrix circuit 10 successively and an FF 16 which is set and reset repeatedly by every time the switching signal A is inputted. This FF 16 is applied with a double broadcast reception signal C from a detection part 7 to be reset and when it is set, the switching signal A' is applied to the circuit 10. In monaural reception mode, the double broadcast signal is allowed to be received to prevent a failure in sound recording due to an error in reception setting. |
