JPS6224364Y2 - - Google Patents

Description

[Detailed Description of the Invention] Field of Application The present invention relates to a recording and reproducing device capable of recording and reproducing simultaneously, such as a three-head tape recorder.
The details relate to the monitor output switching circuit.

Background A conventional three-head tape recorder will be explained with reference to FIG. In Fig. 1, 1 is an input terminal, 2 is a line amplifier, 3 is a recording amplifier, 4 is a bias oscillator, 5 is a recording head, 6 is a magnetic tape (recording medium), 7 is a playback head, 8 is a playback amplifier,
9 is a line amplifier, 10 is a tape source changeover switch (monitor signal changeover switch), and 11 is an output terminal. In FIG. 1, when the tape recorder is put into the recording state, the signal at the input terminal 1 is amplified by the line amplifier 2, optimally compensated for recording by the recording amplifier 3, added to the bias signal from the bias oscillator 4, and supplied to the recording head 5. Recorded on tape 6. The signal recorded on the tape 6 is reproduced by the reproduction head 7, compensated for reproduction by the reproduction amplifier 8, amplified by the line amplifier 9, and then switched to the tape source selector switch 1.
Enters 0. This tape source changeover switch allows the user to select whether the signal to be monitored is the output signal of the line amplifier 2 or the output signal of the line amplifier 9. When recording with such a three-head tape recorder, generally before recording, turn the tape source selector switch 10 to the source side a, adjust the recording level, and put the tape recorder into recording mode.
The tape source changeover switch 10 is set to the tape side b, and the recorded and reproduced signals are monitored. A pause switch (not shown) can be used, for example.
When recording FM broadcasts, etc., when you want to remove commercials, etc., use the pause switch to temporarily stop recording without canceling the recording state using the stop switch, and then release the switch to start recording again. It is possible. However, in conventional tape recorders, the tape source selector switch 10 is set to the tape side B, and the pause switch is turned.
When turned on, recording will pause and no signal will appear at the output, and even if you want to start recording again, you won't know the beginning. Therefore, turn the tape source selector switch 10 to the source side again, monitor the input signal, and select the desired beginning. Turn the pause off and start recording.
Then, the tape source switch was again turned to tape and the recorded signal was monitored, which had the disadvantage of being extremely cumbersome to operate.

As a way to correct this drawback, the pause switch is linked to the tape source selection switch, so that when the switch is turned on during recording or playback, the source signal is output regardless of the tape source selection switch, and when it is OFF, the source signal is output. There are some that output a signal specified by a tape source selector switch.

However, in the conventional example, the pause switch is not activated during playback.
When turned ON, the source signal is forcibly output, which has the disadvantage of outputting a completely different program.

Purpose An object of the present invention is to provide a monitor switching circuit that can eliminate the above-mentioned conventional drawbacks.

Outline The main point of the present invention is to guide the source signal of the recording circuit to the output terminal only during recording pause.

Example An embodiment of the present invention will be described below with reference to FIG.

In FIG. 2, 100 is a tape source automatic changeover switch (recording/playback signal automatic changeover switch) which is linked with the recording pause switch, and 12 is a tape source manual changeover switch. In FIG. 2, when the tape recorder is put into recording mode, an input signal 1 is amplified by a line amplifier 2, optimally compensated for recording by a recording amplifier 3, added to a bias signal from a bias oscillator 4, and supplied to a recording head 5. Recorded on magnetic tape 6. The signal recorded on the magnetic tape 6 is reproduced by a reproduction head 7, compensated for reproduction by a reproduction amplifier 8, and amplified by a line amplifier 9. The amplified signal enters the tape source manual changeover switch 12 (monitor signal changeover switch), and the user selects the monitor output. This output enters the tape source automatic changeover switch 100. This switch 100 is in the recording state and the pause switch is turned on.
It is connected to the source signal which is the output of the line amplifier 2 only when it is turned on (temporary rest state), and in other states it is connected to the fixed contact c of the tape source manual changeover switch 12.

An embodiment of the drive circuit of this tape source automatic changeover switch 100 is shown in FIG. In FIG. 3, 13 to 20 are resistors, 21 to 24 are transistors, and 25 is a tape source automatic changeover switch 100.
26 is a switch that works with the recording switch, 27 is a switch that works with the pause switch, 28 is a DC power supply terminal,
29 is a ground terminal.

When a relay is used as the tape source automatic changeover switch 100, the switch 26 interlocked with the recording switch in FIG. 3 is connected to the power supply terminal 28 during recording. Therefore, transistor 21 is turned on and transistor 22 is turned off. Since the switch 27 interlocked with the pause switch is connected to ground in the pause state, the transistor 23 is also turned off, so the transistor 24 is turned on, current flows through the relay drive coil 25, and the contacts of the relay are switched. In other than these states, for example, if the pause switch is OFF, the transistor 23 is ON.
Therefore, the transistor 24 is turned off and the relay contacts are not switched. Also, the pose switch
If it is ON and the recording switch is OFF, switch 26
is connected to ground, so transistor 21
The transistor 22 is turned on and the transistor 24 is turned off, so that no current flows through the relay drive coil 25. Therefore, the drive coil 2 of the relay
Terminal a, which is connected when current flows through 5, is the second
Line amplifier 2 as shown in switch 100 in the figure.
The other terminal b of the relay can be connected to point c of the tape source manual changeover switch 12.

With this invention, while recording with a tape recorder, the signal recorded on the tape is played back and output, but when the desired song ends and the pause switch is turned on, the output signal is the source side signal before being recorded on the tape. , you can select the songs you want to record,
Then, when the desired song starts, recording is restarted by canceling the pause, and the output signal can be switched to the signal recorded and played back on the tape. In the above embodiment, a three-head system including a recording head, a reproducing head, and an erasing head was described, but the present invention can be applied to any recording/reproducing apparatus as long as it has the function of performing recording and reproducing simultaneously. Needless to say.

Effects According to the present invention, by simply pausing during recording, the output signal can be switched from the signal recorded and played back on the recording medium to the signal before being recorded on the recording medium, so it can be used for commercial cuts such as FM broadcasting. This makes it extremely easy to operate, improves operation, and is extremely convenient for the user. Furthermore, in the embodiment shown in FIG. 2, the monitor output can also be switched arbitrarily according to the user's wishes.

Further, according to the present invention, since the source signal is output only during the recording pause regardless of the monitor signal changeover switch, it is possible to eliminate the signal output from the source during the playback pause.

[Brief explanation of the drawing]

Figure 1 is a block diagram of a general tape recorder.
Figure 2 is a block diagram showing an embodiment of the present invention;
The figure is a specific circuit diagram of the main part of the present invention. 100: Record/playback signal automatic changeover switch (tape source automatic changeover switch), 11: Output terminal, 12: Monitor signal changeover switch (tape source manual changeover switch).

Claims (1)

[Scope of utility model registration request] Selecting an input terminal, an output terminal, a recording circuit including a recording head provided independently, a reproduction circuit including a reproduction head, a recording signal of the recording circuit, and a reproduction signal of the reproduction circuit. The recording/reproducing apparatus is equipped with a manual monitor signal changeover switch means for automatically switching the monitor signal and guiding the monitor signal to the output terminal. , the automatic changeover switch means outputs the recording signal to the output terminal during the recording pause, and outputs one of the recording/playback signals selected by the monitor signal changeover switch to the output terminal at times other than the recording pause. A monitor output switching circuit characterized in that it is configured to.