JPH0142820Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to a double tape deck equipped with a timer recording function and a copy function, which is equipped with an error prevention function. A double tape deck equipped with a timer recording function and a copy function is constructed as shown in FIG. 1, for example. That is, reference numeral 1 in the figure is an A-side reproduction head, and this reproduction signal is amplified by an A-side amplifier 2. Further, numeral 3 is a line input for inputting signals from a tuner or the like, and this input level is varied by an input level volume 4. 5 is the B-side recording/playback head, and this playback signal is sent to the B-side playback amplifier 6.
is amplified. Further, 7 is a recording/playback electronic switch, and 8 is an A/B switching electronic switch, and these electronic switches 7 and 8 are constituted by, for example, C-MOS bidirectional switches. When the gates 7a to 7d of the electronic switch 7 are at H level, the switch parts 7e to
7h is conductive, and when it is at L level, switch section 7e~
7h is cut off. Furthermore, when the gates 8a and 8b of the electronic switch 8 are at H level, the switch section 8
c and 8d are conductive, and when they are at L level, the switch part 8
c and 8d are blocked. Also, 9 is a noise reduction equalizer amplifier, 10 is a line output, 11 is a recording amplifier, 12
is a head selector switch. The head changeover switch 12 puts the B-side recording/playback head 5 in the recording state during recording (at this time, the coil 21 is energized and the movable contact piece 12a is switched to the one fixed contact 12b side), and during playback (at this time, the coil 21 is not energized and the movable contact piece 12a is switched to the other fixed contact 12c), the B-side recording/playback head 5 is brought into the playback state. Further, 13 to 16 are inverters, 17 is an AND gate, 18 to 20 are NAND gates, and 22 is a copy function switch. Copy function switch 22
When is ON, one input terminal of NAND gate 20 is at L level, and when is OFF, one input terminal of NAND gate 20 is at H level. Further, 25 to 27 are terminals, terminal 25 is at H level when recording, terminal 26 is at H level when the B side mechanism is recording and playing back, and terminal 27 is at H level.
The A side mechanism becomes H level during recording and playback. Furthermore, during recording, both terminals 25 and 26 are set to H.
level. In the above configuration, the controller applied to the gates 7b and 7d of the electronic recording/playback switch 7

[Table] In the above table, REC is when not recording, REC is
indicates the time of recording. Since the control signals applied to gates 7a and 7c are obtained by inverting the control signals applied to gates 7b and 7d by inverter 15, the mode is opposite to that shown in the table above. In addition, the gate 8b of the A/B changeover electronic switch 8
The mode of the control signal applied to is as shown in the table below.

[Table] In the above table, A.PLAY indicates that the mechanism on the A side is not recording or playing.
A.PLAY indicates that the mechanism on the A side is in recording/playback mode. Also, B.PLAY is B.
B.PLAY indicates that the mechanism on the B side is in the non-recording or playback mode, and B.PLAY indicates that the B-side mechanism is in the recording or playback mode. Also,
REC and REC are the same as in the table above. When recording, both REC and B.PLAY outputs are output. Since the control signal applied to the gate 8a is the control signal applied to the gate 8b inverted by the inverter 16, the mode is opposite to that shown in the table above. Therefore, when recording with the mechanism on the B side in the OFF mode of the copy function switch 22, both terminals 25 and 26 are at H level, gate 7a is at H level, and gate 8 is at H level.
b goes to H level, switch sections 7e and 8d become conductive, and the signal from line input 3 is amplified by noise reduction equalizer amplifier 9 and recording amplifier 11, and then sent to B side recording/playback head 5.
This signal is output from line output 10. At this time, the B side recording head 5 is switched to the recording state by the head changeover switch 12. In addition, when the copy function switch 22 is in the ON mode and the signal reproduced by the mechanism on the A side is recorded using the mechanism on the B side, terminals 25 and 2
Since gates 6 and 27 are all at H level, gate 7a
becomes L level, switch section 7e is cut off and line input 3 is disconnected, while gate 8a becomes H level.
level and the switch section 8c becomes conductive, and the gate 7d becomes the H level and the switch section 7h becomes conductive, so that the reproduction signal reproduced by the A side replay head 1 is transferred to the noise reduction equalizer amplifier 9 and the recording signal. After being amplified by the amplifier 11, it is input to the B-side recording/playback head 5 and recording is performed.
This reproduction signal is output from the line output 10. In addition, when recording with the mechanism on the B side when the copy function switch 22 is turned OFF and the timer is operating, both terminals 25 and 26 are set to H.
Therefore, the gate 7a becomes H level and the switch part 7e becomes conductive, while the gate 8b becomes H level and the switch part 8d becomes conductive, and the coil 21 becomes conductive and the movable contact piece 12a is turned to one side. After switching to the fixed contact 12b side, the signal from the line input 3 is amplified by the noise reduction equalizer amplifier 9 and the recording amplifier 11, and then
The signal is input to the side recording/playback head 5. In addition, when reproducing using the mechanism on the B side, since the terminal 25 is at L level and the terminal 26 is at H level, gate 7
b, 7d go to H level and switch parts 7f, 7
h becomes conductive, the gate 8b becomes H level, the switch part 8d becomes conductive, and since the coil 21 is not energized, the movable contact 12a switches to the other fixed contact 12c, thereby switching the B side recording/playback head. The signal reproduced at 5 is amplified by a B-side reproduction amplifier 6 and a noise reduction equalizer amplifier 9, and is output from a line output 10. Also, A
When reproducing using the side mechanism, the terminal 25 is at the L level and the terminal 27 is at the H level, so the gate 8a goes to the H level and the switch part 8c becomes conductive, while the gate 7d goes to the H level and the switch part becomes conductive. 7h becomes conductive, whereby the signal reproduced by the A-side reproduction head 1 is amplified by the A-side reproduction amplifier 2 and the noise reduction equalizer amplifier 9, and then output from the line output 10. As described above, when the copy function switch 22 is in the ON mode, the line input 3 is disconnected, making it impossible to record from an external device such as a tuner. Therefore, if the timer switch is turned on while the copy function switch 22 is in the ON mode to record while the user is away, an erroneous operation such as recording with no signal input will occur. This invention was made in view of the above circumstances, and its purpose is to
To provide a double tape deck capable of avoiding the situation of recording with no signal input even if the timer switch is set to the recording position with the timer switch in the ON mode and recording is performed while the user is away. An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 shows an example of the present invention, in which the same components as those shown in FIG. The characteristic feature of this embodiment is that a timer function switch 23 electrically interlocked with the copy function switch 22 is connected in series with the copy function switch 22, which is surrounded by a dashed line in FIG. The timer function switch 23 has a movable contact piece 23a connected to ground, a timer PLAY contact 23b and an OFF contact 23c connected to the copy function switch 22, and a timer REC contact that is circuit-separated from the copy function switch 22. 23d. In the above embodiment, when the timer function switch 23 is set to the timer PLAY or OFF, the copy function switch 22 is connected to the ground via the movable contact piece 23a. Therefore, copy function switch 2
When 2 is turned on, one input terminal of the NAND gate 20 is at L level, and when it is OFF, one input terminal of NAND gate 20 is at H level, and the same effect as shown in FIG. 1 is obtained. However, if the timer function switch 23 is
When switching to REC, copy function switch 2
2 is disconnected from ground. In other words, circuit-wise
Equivalent to OFF. Therefore, even if the copy function switch 22 is turned on or off, one input terminal of the NAND gate 20 is always at the H level. Therefore, the modes of the control signals applied to the gates 7a to 7d of the electronic recording/playback switch 7 are as shown in the following table.

[Table] Also, gate 8 of A/B switch 8
The mode of the control signal applied to a and 8b is as shown in the following table.

[Table] In the above table, A.PLAY, A.PLAY,
B.PLAY is the same as in the table above. Therefore, even if the copy function switch 22 remains ON, the gates 7a and 8b are at the H level, so the switch portions 7e and 8d are conductive. Therefore, the line input 3 is not disconnected, and after the signal from the line input 3 is amplified by the noise reduction equalizer amplifier 9 and the recording amplifier 11, the B-side recording/playback head 5 (head selector switch 12 switches the head to recording mode). ) and recording is performed. As explained above, according to the present invention, even if the copy function switch is in the ON state at the timer recording position (timer REC), this can be controlled by the circuit.
Equipped with a timer function switch that is equivalent to OFF, so even if you forget to turn the copy function switch OFF and record while you are away, the line input will not be disconnected and you will be recording with no signal input. It can be avoided. In addition, when the copy function switch is changed to a push switch, it is difficult to distinguish between ON and OFF states, so with conventional double tape decks, recording with no signal input is likely to occur, but with this invention, such situations can be avoided. is particularly effective.

[Brief explanation of drawings]

FIG. 1 is a control circuit diagram of a conventional double tape deck, and FIG. 2 is a control circuit diagram showing an embodiment of the double tape deck of the present invention. 1...A side playback head, 3...Line input, 5
... B-side recording/playback head, 7... Recording/playback electronic switch, 8... A/B switching electronic switch,
13-16...Inverter, 17...AND gate, 19, 20...Nant gate, 22...Copy function switch, 23...Timer function switch, 23d...Timer recording position (timer
REC contact).

Claims (1)

[Scope of utility model registration request] In a double tape deck equipped with a timer recording function and a copy function and configured such that the line input is disconnected when the copy function switch is in the ON state, when the copy function switch is in the ON state when in the timer recording position. This is a double tape deck characterized by being equipped with a timer function switch that is circuit-wise equivalent to turning off.