JPH0323964B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape recorder, and more particularly to a tape recorder in which two tapes can be set and dubbing can be performed between the two tapes.

Conventionally, there has been a tape recorder of this type as shown in FIG.

This tape recorder includes a drive system 12 that drives set cassette tapes 10A and 10B, and an amplifier system 1 that is connected to heads 14A and 14B.
6, and a control system 18 that controls the drive system 12 and the amplifier system 16.

The tapes 10A and 10B are set in drive devices 20A and 20B of the drive system 12 and driven respectively.

The head 14A is used to store the cassette tape 1.
0A can be recorded and played back, and head 14B can play back cassette 10B.

Furthermore, the amplifier system 16 includes a recording amplifier 22 that excites the head 14A, a reproduction amplifier 24A that amplifies the signal picked up by the head 14A,
A reproducing amplifier 24B is provided to amplify the signal picked up by the head 14B.

In this way, this conventional device includes a head 14A, a drive device 20A, a recording amplifier 22, and a playback amplifier 24A.
a recording/playback system for recording and playing back the cassette tape 10A, a head 14B, and a drive device 20.
B, cassette tape 10 including playback amplifier 24B
A reproducing system for reproducing B.

Note that the playback signal 100A of the playback amplifier 24A is outputted to the outside from the terminal 26A, the playback signal 100B of the playback amplifier 24B is outputted to the outside from the terminal 26B, and the recording amplifier 22 is also outputted to the outside from the terminal 26A.
C. The recording signal 102 is input from the outside via the recording level adjustment volume 28.

Here, this tape recorder can record cassette tape 1.
It is possible to dub the contents of 0B to the cassette tape 10A, and therefore the playback amplifier 14
A changeover switch 30 for switching output between the B playback signal 100B and the recording signal 102 is provided on the front side of the recording amplifier 22.

Furthermore, this tape recorder employs the so-called Dolby system, and for this reason, a compression operation circuit 32 is provided before the recording amplifier 22 to which the switching output of the switching switch 30 is supplied, and a compression operation circuit 32 is provided before the recording amplifier 22. Extension operation circuit 3 on the output side
4A and 34B are provided respectively. This compression operation circuit 32 is capable of amplifying a small level signal according to a predetermined frequency characteristic, and at this time, the level of a high frequency region can be enhanced, and the expansion operation circuit 34
A and 34B can perform signal operations opposite to those of the compression operation circuit 32. When the signal is compressed and expanded according to the Dolby system in this way, it is possible to perform playback in which only tape noise is reduced. This principle makes use of the masking effect in which the human ear does not perceive small noises in contrast to loud sounds, but the human ear perceives noise in response to small sounds.

Note that the compression operation circuit 32 and the expansion operation circuit 3
4A and 34B are composed of ICs, and when power supply voltage is applied to their predetermined terminals, such signal manipulation operations are invalidated and the input signals are output as they are.

The drive system 12 and amplifier system 16 described above are controlled by the control system 18 described above as follows.

This control system 18 includes a plurality of operation keys 36a, 3
6b, 36c, 36d...36n, and outputs various commands by operating them singly or in combination, and the drive devices 20A, 20B according to various commands from the command circuit 38. , control signals 200A, 200B to the recording amplifier 20 and playback amplifiers 24A, 24B,
A control circuit 40 outputs signals 200, 204A, and 204B, respectively, and further drives the changeover switch 30 with a control signal 206, and is inserted between a power supply 42 and the operation circuits 32, 34A, and 34B, and is turned on to turn on the power supply. Voltage operating circuit 32,3
4A, 34B to disable their operation. Note that the control circuit path 40 is composed of a microcomputer and the like.

Here, among the operation keys 36, in this example, the operation key 36A is for a dubbing command, and the operation key 36B is for a high-speed command, and when the dubbing command key 36A is operated, the driving device 20A, 20B, recording amplifier 22, playback amplifier 2
4B starts operating, the selector switch 30 is switched to the output side of the reproduction amplifier 24B, and when the high speed command key 36B is operated, the drive devices 20A,
20B drives the cassette tapes 10A and 10B at high speed (for example, twice the low speed).

Since the tape recorder shown in FIG. 1 is configured as described above, this tape recorder records and plays back the cassette tape 10A, plays back the cassette tape 10B, and transfers the contents of the cassette tape 10B to the cassette tape 10A. By operating the switches 44 and 46 during recording, playback, and dubbing, low-noise playback can be performed, and by operating the high-speed command key 36B during dubbing, the cassette tapes 10A and 10B are driven. Devices 20A, 20B
It is possible to drive at high speed and complete the dubbing in a short time.

Here, when the dubbing command key 36A and the high speed command key 36B are operated and the contents of the cassette tape 10B are being dubbed onto the cassette tape 10B at high speed, one or both of the operation disable switches 44 and 46B are turned off. When the cassette tape 10B is being operated and one or both of the operating circuits 32 and 34B are operating, the frequency characteristics that serve as the reference for signal operation of the operating circuits 32 and 34B are constant, but the cassette tape 10B is being driven at high speed. Therefore, the frequency of the playback signal 100B output from the playback amplifier 24B varies highly depending on the speed. Therefore, in this type of tape recorder, dubbing is performed in accordance with predetermined frequency characteristics. Therefore, such operations must be prohibited.

However, in the conventional tape recorder, the operation disabling switches 44, 46B are manually operated, so they are often accidentally turned off during high-speed dubbing.
This has caused failures in high-speed dubbing.

The present invention has been made in view of the above-mentioned conventional problems, and its object is to provide a tape recorder that can perform high-speed dubbing without failure even if the operation disable switch is operated by mistake. There is a particular thing.

In order to achieve the above object, the present invention provides a recording system that performs recording on a set first tape while driving the tape, and a recording system that performs recording on a set second tape while driving the tape. a playback system; a control system that controls the recording system and the playback system;
The recording system includes a compression operation circuit that amplifies a small level signal according to a predetermined frequency characteristic, the playback system includes an expansion operation circuit that performs an operation operation opposite to that of the compression operation circuit, and the control system a high-speed command key that outputs a command to drive each tape at high speed to the recording system and playback system; a first operation disabling switch that disables the operation of the compression operation circuit; and a first operation disable switch that disables the operation of the compression operation circuit. a second operation disabling switch for disabling the operation of the circuit, both tapes are driven at high speed by operation of a high speed command key, and a playback signal from the playback system is supplied to the recording system to The present invention is characterized in that when the recorded contents of one tape are recorded at high speed on a second tape, a both operation invalidation switch is driven to invalidate the operations of the compression operation circuit and the expansion operation circuit.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a tape recorder according to the present invention will be described below based on the drawings.

FIG. 2 shows a preferred embodiment of the tape recorder according to the present invention, and the same members as those in the conventional device shown in FIG.

In the amplifier system 16 of this embodiment, the head 1
In addition to the recording amplifier 22A provided for the head 14A, a recording amplifier 22B is also provided for the head 14B, and a compression operation circuit 32A is provided before the recording amplifier 22A, whereas a compression operation circuit 32A is provided before the recording amplifier 22B. Compression operation circuit 32B
is provided.

Incidentally, recording level adjustment volumes 28A and 28B are provided at the rear of the input terminals 26a and 26d, respectively, and between the output side of the changeover switch 30 and the expansion operation circuit 34B, a so-called Dolby level is adjusted at the time of dubbing. A recording level adjustment volume 28c is provided in order to match the recording and reproduction systems.

Since the amplifier system 16 is configured as described above, the tape recorder of this embodiment has a driving device 20.
A, a first recording and reproducing system including a recording amplifier 22A and a reproducing amplifier 24A, and a second recording and reproducing system including a drive device 20B, a recording amplifier 22B and a reproducing amplifier 24B are formed, and the first recording and reproducing system is a cassette tape. 10A, and the second recording/playback system can record and playback the cassette tape 10B.

Next, the control system 18 that controls the drive system 12 and amplifier system 16 will be described.

As mentioned above, since the amplifier system 16 of this embodiment is provided with the compression operation circuit 32B, the control system 18 is newly equipped with an operation disable switch 44B that operates the compression operation circuit 32B or disables its operation. An operation disable switch 44
When the switch B is turned on like the switches 44A, 46A, and 46B, it is possible to supply the power supply voltage to the compression operation circuit 42B and disable its operation.

In this embodiment, the operation disabling switch 4 is
4A, 44B, 46A, 46B are control signals 208A, 208B, 21 output from the control circuit 40
The drive is controlled by 0A and 210B, respectively.
This control circuit 40 can output control signals 208A and 210A in response to a command output when the Dolby key 36k of the command circuit 38 is operated.
In addition, control signals 210B and 208B can be output in response to commands output when the Dolby key 36l is operated, and here, when the Dolby key 36k is turned on, the operation disable switch 44 is turned on.
When A and 44A are turned on at the same time and Dolby key 36k is turned off, the operation disable switch 44
A, 46B are turned off at the same time, and when the Dolby key 36l is turned on, the operation disable switches 44B and 46B are operated simultaneously, and when the Dolby key 36l is turned off, the operation disable switch 44 is turned off.
B and 46B are turned off at the same time.

Here, when the dubbing command key 36a and the high-speed command key 36b are operated to perform high-speed dubbing, the control circuit 40 ignores these commands and turns on the operation disable switch regardless of the operating state of the Dolby keys 36k and 36l. 44A, 44B,
46A, 46B have control signals 208A, 208B,
210A, 210B, and turns on these operation invalid switches 44A, 44B, 46A, 46B to turn on operation circuits 32A, 32B, 34A, 34B.
It is possible to disable this operation.

A preferred embodiment of the present invention has the above configuration,
The effect will be explained below.

When one of the operation keys 36 of the command circuit 38 that commands playback is operated and a playback command is given to the control circuit 40, control signals 200A and 204A are given to the drive device 20A and the playback amplifier 24A to read the cassette tape 10A. Reproduction is performed, and the reproduction signal 100A is output to the outside from the terminal 26A, or the control signals 200B and 204B are output to the drive device 10.
B, is applied to the reproduction amplifier 24B to reproduce the cassette tape 10B, and a reproduction signal 100B is outputted to the outside from the terminal 26B.

The selection of which of the cassette tapes 10A and 10B or both of them is to be played is made using the operation key 3 of the operation circuit 38.
It is selected by the operation in step 6. Furthermore, whether or not to operate the expansion operation circuits 34A and 34B during reproduction is selected by operating the Dolby keys 36k and 36l.

Further, when recording is to be performed, one of the operation keys 36 of the command circuit 36 for recording is operated, and a recording command is given to the control circuit 40. As a result, the control circuit 40 supplies the control signals 200A and 202A to the drive circuit 20A and the recording amplifier 22A to perform recording on the cassette tape 10A, or supplies the control signals 200B and 202B to the drive circuit 20B and the recording amplifier 22B to perform recording on the cassette tape 10A. Recording is performed on tape 10B.

The selection of whether to record to cassette tape 10A, cassette tape 10B, or both cassette tapes 10A and 10B is made by operating the operation key 36 of the operation circuit 38. The control circuit 40 generates control signals 200A, 200B,
202A and 202B are output. Also, you can select whether or not to perform Dolby recording using the Dolby key 36.
k, 36l.

As described above, this tape recorder is capable of recording and reproducing both cassette tapes 10A and 10B.

Next, I will explain how to perform dubbing.

First, when constant speed dubbing is performed, the Dolby keys 36k and 36l are operated in advance to drive the switches 44A, 44B, 46A, and 46B.
It is selected whether or not to operate the operation circuits 32A, 34B. Next, the dubbing command key 36a is operated to give a dubbing command to the control circuit 40.
Control signals 200A, 200B,
202A, 204B are drive devices 20A, 20B,
The control signal 206 is applied to the recording amplifier 22A and the reproduction amplifier 24B, and the control signal 206 is applied to the changeover switch 30, so that the changeover switch 30 is switched to the recording level adjustment volume 28c side. As a result, the cassette tape 10B is played back, and the playback signal 100B from the playback amplifier 24B is supplied to the recording amplifier 22A via the recording level adjustment volume 28c and the changeover switch 30, and the contents of the cassette tape 10B are copied from the cassette tape 10A. be done.
When dubbing is performed using the Dolby system, the recording level adjusting volume 28c is adjusted in advance to match the levels between the re-recording system and the playback system (Dolby level matching).

Further, when high-speed dubbing is performed, the high-speed command key 36b is also operated and a high-speed command is given to the control circuit 40. At this time, the control circuit 40 uses the high-speed command to disable the operation disabling switches 44A, 44B, regardless of the state of the operation keys 36k, 36l.
46A, 46B are all turned on and the operation circuit 32A,
After disabling the operation of 34B, the drive device 20A,
20B, recording amplifier 22A, and reproduction amplifier 24B are operated to perform dubbing while driving the cassette tapes 10A and 10B at high speed. Therefore, in this embodiment, the operation of the operating circuits 32A and 34B is disabled regardless of the operating state of the Dolby keys 36k and 36l, and the cassette tape 10B is driven at high speed, thereby causing the playback amplifier 24B, which has changed to a high frequency, to operate. Reproduction signal 100B is operating circuit 3
Pass through 4B and 32A as they are to the recording amplifier 22.
A and recorded onto the cassette tape 10A without being manipulated.

In this way, in this embodiment, the high speed command key 36B
The operation disable switches 44A, 46B are driven in conjunction with the operation circuits 32A, 34 during high-speed dubbing.
Since the operation of B is disabled, when high-speed dubbing is performed, Dolby keys 36k and 3 may be accidentally pressed.
Even if the 6l is operated, high-speed dubbing can be performed without disturbing the frequency characteristics.

As explained above, according to the present invention, even if a tape recorder is inadvertently commanded to perform a compression or decompression operation during high-speed dubbing, the tape recorder ignores the command and performs high-speed dubbing. It is possible to do this without failure.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional tape recorder, and FIG. 2 is a block diagram of a preferred embodiment of the tape recorder according to the present invention. 10A, 10B...cassette tape, 12...
Drive system, 14A, 14B...head, 16...amplifier system, 18...control system, 22...recording amplifier,
24A, 24B...Reproduction amplifier, 30...Selector switch, 32A, 32B...Compression operation circuit, 34
A, 34B...Extension operation circuit, 36a...Dubbing command key, 36b...High speed command key, 36k,
36l...Dolby key, 38...Command circuit, 4
0... Control circuit, 44A, 44B... Operation invalidation switch, 46A, 46B... Operation invalidation switch.

Claims (1)

[Claims] 1. A recording system that performs recording on a set first tape while driving it; a playback system that plays back a set second tape while driving it; and the recording system and playback system. The recording system includes a compression operation circuit that amplifies a small level signal according to a predetermined frequency characteristic, and the playback system includes an expansion operation that performs an operation operation opposite to that of the compression operation circuit. The control system includes a high-speed command key that outputs a command to drive the tape at high speed to the recording system and the playback system, respectively, and a first operation disable switch that disables the operation of the compression operation circuit. and a second operation disabling switch for disabling the operation of the expansion operation circuit, wherein both tapes are driven at high speed by operation of a high speed command key and the reproduction signal of the reproduction system is transmitted to the recording system. and when the recorded content of the first tape is recorded at high speed on the second tape, the both operation disabling switch is driven to disable the operations of the compression operation circuit and the expansion operation circuit. tape recorder.