| 摘要 |
PURPOSE:To sound-record only a built-in microphone signal at the time of sound recording by a built-in microphone by constituting so that a mixing input signal is not inputted to a mixing circuit, when the built-in microphone is used. CONSTITUTION:When a radio/tape changeover switch 18 is switched to a tape side contact T in a state that a plug of an external microphone is not connected to a external microphone connecting jack 6, muting circuits 3, 19 are operated. In this state, even if any signal is inputted to a mixing input terminal 1, an amplifier 2 is not operated, therefore, this mixing signal does not appear in the output side of the amplifier 2. Sound recording in this case is executed with respect to only a signal from a built-in microphone 5, and a signal of this microphone 5 is supplied to a magnetic head 4 through a sound recording and reproducing combined amplifier 8, etc., and is recorded in a magnetic tape. In this way, at the time of sound recording by the built-in microphone, only the built-in microphone signal can be sound-recorded. |
