JPS5998308A - tape recorder - Google Patents

Abstract

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.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape recorder that is capable of mixing recording and playback.The purpose of the present invention is to record only the built-in microphone signal when recording with the built-in microphone. It consists in trying to eliminate inconveniences.

Some tape recorders that are capable of conventional mixing recording and playback are now capable of mixing recording, in which the signal from the built-in microphone is mixed with other signals such as the output signal from a radio receiver or record player. There was something composed. However, in this type of tape recorder, when recording the signal from the built-in microphone, muting is applied to prevent the monitor sound from being output from the speaker to prevent howling, so the output signal from the radio receiver etc. It was not possible to easily check whether the recorded sound was properly mixed with the built-in microphone signal or whether the mixing ratio was appropriate, and mixing recordings often failed.

SUMMARY OF THE INVENTION The present invention aims to eliminate these conventional drawbacks, and one embodiment thereof will be described below with reference to drawings of a tape recorder with a radio receiver. In the figure 1
is a mixing signal input terminal, 2 is an amplifier, 3 is a muting circuit for the above amplifier 2, 4 is a magnetic head for recording and playback, 6 is a built-in microphone, e is an external microphone connection jack, 7 is a radio reception circuit, 8 is a recording and playback Dual-purpose preamplifier, 9 is a reproduction equalizer circuit, 10 is a recording equalizer circuit, 11 is a recording amplifier, 12.13.14.

16 is an interlocking recording/playback selector switch, P is its playback side contact, R is its recording side contact, 16 is a mixing amplifier, 1
7.18 is the interlocking radio/tape selector switch, Ra
is a contact on the radio side, T is a contact on the tape side, and 19 is a meeting (for meeting the output signal of the amplifier 16).
In the circuit, 2o is a variable resistor for volume adjustment, 21 is an output amplifier, 22 is a speaker, and 23 is a power supply terminal.

The muting circuits 3 and 19 perform a meeting operation when a power supply voltage is applied to their control input terminals C. The power terminal 23 is connected from the movable contact of the recording/playback changeover switch 12 to the recording side contact R, from the movable contact of the radio/tape changeover switch 18 to the tape side contact T, and through the normally closed switch contacts d and c of the jack 6. -- It is connected to the control input terminal C of the timing circuit 3, 19.

The operation of the above embodiment will now be explained.

When the radio/tape changeover switch 18 is switched to the tape side contact T with no external microphone plug connected to the external microphone connection jack 6 and the tape recorder is placed in the recording state, muting occurs via the path described above. A power supply voltage is applied to the circuits 3 and 19, and the muting circuits 3 and 19 are activated. In this state, no matter what signal is input to the mixing input terminal 1, the amplifier 2 does not operate, so this mixing signal does not appear on the output side of the amplifier 2. Further, by operating the muting circuit 19, the output signal of the amplifier 16 is muted, so that the fi sound motor signal is not output to the speaker, and howling is prevented. In this case, recording is performed only on the signal from the built-in microphone 5, and the signal from the built-in microphone 6 is transmitted from the contact piece a of the jack 6 to the recording/playback selector switch 15.
The output signal of this amplifier 8 is inputted to the recording/playback amplifier 8 via the recording side contact R1 of the movable contact, and the output signal of this amplifier 8 is inputted to the recording/playback amplifier 11 via the tape side contact T of the radio/tape changeover switch 17 and the movable contact. Changeover switch 14
The signal is supplied to the magnetic field 7 through the recording side movable contact R1, and is recorded on a magnetic tape (not shown).

On the other hand, the external microphone connection jack 1. When an external microphone is connected to the jack 6, contacts a, b and contacts c, d of the jack 6 are opened, and the built-in microphone 6
At the same time, the muting circuits 3 and 19 also cease to operate. If a recording operation is performed in this state, the signal from the external microphone and the external signal from a record player or the like applied to the mixing input terminal 1 can be mixed and recorded on the magnetic tape. Further, when a playback operation is performed with an external microphone connected to the jack 6, the playback signal from the magnetic head 4 and the signal applied to the mixing input terminal 1 are mixed and amplified by the amplifier 16 and output from the speaker 22.

Connect the radio tape selector switch 17 to the radio side contact R.
When switched to a, if the tape recorder is in a state other than recording at this time, the radio reception signal and the mixing input signal can be mixed and amplified to amplify the sound from the speaker 22. At this time, if the radio receiving circuit 7 is set to receive the transmission signal of the wireless microphone, the sound from the wireless microphone and the mixing input signal, such as the output of a record player, can be mixed and amplified.

As explained above, according to the tape recorder of the present invention,
Mixing recording cannot be performed unless an external microphone is connected to the external microphone connection jack, and only the signal from the built-in microphone can be recorded, so there is no chance of failure in mixing recording, resulting in good recording. can be done.

[Brief explanation of the drawing]

The drawing is a circuit diagram showing an embodiment of the present invention. 1... Mixing input terminal, 3... Venting circuit, 6... Built-in microphone, 6
...External microphone connection jack, 12...
... Recording/playback selector switch, 19... Muting circuit.

Claims (1)

[Claims] A tape recorder equipped with a built-in microphone and an external microphone connection terminal, characterized in that the tape recorder is configured so that an external mixing input signal is not input to the mixing circuit when the built-in microphone is used.