| 摘要 |
PURPOSE:To avoid a sound recording signal from being switched even with misoperation of an operating knob of a selector circuit during the sound recording by outputting a control signal inhibiting the changeover of the selector circuit from a tape recorder during the sound recording. CONSTITUTION:When the tape recorder 8 is in the sound recording state, a control signal representing a sound recording state is inputted to a control circuit 7 from the tape recorder 8. When the control signal representing the sound recording state from the tape recorder 8 is inputted to the control circuit 7, since a signal from an operating knob 6 is not received, even when the operation knob 6 is operated in this case, the selector circuit 4 is not changed over. Since no signal from an output terminal 5 of the selector circuit 4 is not given to a sound recording input terminal of the tape recorder 8, since the selector circuit 4 is not changed over during the sound recording, no sound recording input signal is changed over.
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