JPH0353683B2 - - Google Patents

Description

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

A normal tape recorder has only one system for the tape drive system, recording amplifier, playback amplifier, etc. Therefore, when recording the same content on another tape (dubbing), two tape recorders are required. This resulted in the inconvenience of having to pay double the price to purchase them and also having to secure that much space.

Therefore, there has been a conventional cassette tape recorder as shown in Fig. 1, which has a drive system for driving two cassette tapes and is configured to perform dubbing between both cassette tapes. It is used in various cases.

The conventional tape recorder shown in FIG.
2. It is composed of a switch 26.

This type of tape recorder uses a system that manipulates signal levels, such as the so-called Dolby system, and this type of system can also be used when dubbing between two sets of tapes. It is structured like this.

When dubbing is performed between both tapes using this type of tape recorder while performing the level control described above, the playback system and recording system of both tapes or one of the tapes must be configured so that the level control is performed. Since the level operation is performed based on a predetermined level, the tape recorder must be operated so that both reference levels match between the two systems. Normally, level matching between the two systems is done in advance during assembly, so the tape recorder is operated so that the playback signal from the playback system is directly supplied to the recording system.

However, with conventional tape recorders,
The choice was made manually whether to record the playback signal from one tape directly to the other tape, or to record while adjusting the level to match the reference level.
There was a problem in that errors often occurred in this selection, resulting in dubbing failures.

The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to provide a tape recorder with good operability that can reduce dubbing failures by automatically performing the above-mentioned selection. It is in.

In order to achieve the above object, the present invention includes a tape recording system that performs recording on a first tape that has been set, and a tape playback system that plays back a second tape that has been set. The recording system includes a compression operation circuit that amplifies a low-level input signal to a relatively high level, and a first operation disable switch that disables the operation of the compression operation circuit. The playback system includes an expansion operation circuit that performs a signal operation opposite to that of the compression operation circuit, and a second operation disable switch that disables the operation of the expansion operation circuit, and the tape recording system receives the reproduction signal of the tape playback system. Record to the first tape. In the tape recorder, the input side of the tape recording system includes a recording level adjustment volume to which the playback signal is supplied, and a volume that is interlocked with the first and second operation disable switches to disable the operation of both operation circuits. The present invention is characterized in that a bypass switch is provided for causing the reproduction signal to bypass a recording level adjustment volume only when the above-mentioned conditions are met.

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 present invention, and the tape recorder of this embodiment is of a cassette type and has playback amplifiers 10, 16, a recording amplifier 12, and a head like the tape recorder of FIG. 14,2
It has 0. In this embodiment, head 2
A recording amplifier 18 is also provided on the 0 side, and together with this, a volume 24 for adjusting the recording level is provided in the preceding stage.

Therefore, the cassette tape recorder of this embodiment includes a playback amplifier 10, a recording amplifier 12, and a head 1.
A first tape recording/playback system including 4 and a playback amplifier 1
6. A second tape recording/playback system including a recording amplifier 18 and a head 20, which is capable of recording and playing back the first cassette tape set in the first tape recording/playback system, and in the second tape recording/playback system. Recording and playback of the set second cassette tape can be performed respectively.

The first and second tape recording and playback systems each employ the so-called Dolby system, and therefore the amplifiers 10, 12, 16, and 18 are connected to the amplifier circuit 1.
0A, 12A, 16A, 18A, expansion operation circuits 10B, 16B, and compression operation circuit 12.
It also has B, 18B. This compression operation circuit 12
B, 18B can control the input signals of the amplifier circuits 12A, 12A so that a small level signal among the input signals is amplified and the high frequency range becomes a relatively high level, and the expansion operation circuit 10B ,1
6B is capable of controlling the output signals of the amplifiers 10A, 16B in a manner opposite to that of the compression operation circuits 12B, 18B. Note that these operation circuits 10B, 1
The operations of 2B, 16B, and 18B can be invalidated by operating invalidation switches 40A and 40B, which will be described later.

As described above, the first and second tape recording/reproducing systems can reduce noise by operating the operation circuits 10B, 12B, 16B, and 18B to control signal levels for compression and expansion operations.

Furthermore, this cassette tape recorder can perform the above-mentioned dubbing, and for this reason, the recording amplifier 1
Volume 22 for adjusting the recording level in the front stage of 2
A switch 26 is provided at the rear stage, similar to the conventional device shown in FIG. A playback signal from the playback amplifier 16 is supplied to the dubbing input side of this switch 26, so that the contents of the cassette tape set in the second tape recording and playback system are transferred to the cassette tape set in the first tape recording and playback system. will be recorded.

Here, in the present invention, the recording level adjustment volume 30 to which the playback signal output from the second tape recording and playback system is supplied, and the bypass switch 28 that bypasses the volume 30 to the playback signal are input to the amplifier 12. It is located on the side. In this embodiment, the reproduction signal of the second tape recording and reproduction system is supplied to the recording amplifier 12 via the semi-fixed resistor 32 when the volume 30 is bypassed. Also, the semi-fixed resistor 32 connects both amplifiers 12 and 16.
It is used for leveling between.

Further, in the present invention, when both the compression operation circuit 12B and the expansion operation circuit 16B are inactive, the switch 28 is linked with the operation disabling switches 40A and 40B so that the reproduction signal of the reproduction amplifier 16 bypasses the volume 30. In order to drive this switch 28, a switch drive circuit 34 is provided in this embodiment.

The switch drive circuit 34 is composed of a drive coil 36 that drives the switch 28 and an OR circuit 38 that excites the drive coil 36. Both OR inputs of the OR circuit 38 include an operation disable switch 40.
Power supply voltage is supplied via A and 40B.
When the operation disable switch 40A is turned on, it changes the power supply voltage to the operation circuits 10B and 12B.
By supplying power to the operation circuits 16B and 18B, the operation can be enabled by supplying power to the operation circuits 16B and 18B by turning on the operation disable switch 40B, and enabling these operations. The switch drive circuit 34 is connected to the switches 40A, 4
When at least one of 0B is turned on, the first and second tape recording/playback system operation circuits 1
When either or both of 2B and 16B are operating, the switch 28 can be driven to the volume 30 side. Further, the switch drive circuit 34 connects the switch 28 to the semi-fixed resistor 32 when both the switches 40A and 40B are turned off and both tape recording and playback systems are not performing Dolby operation.
Can be driven to the side.

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

In this embodiment, one set of playback amplifiers 10, 16 and one set of recording amplifiers 12, 18 are provided for both cassette tapes, so recording is performed on each cassette tape, and the same is played back. be able to. Incidentally, when recording these cassette tapes, the recording level is adjusted using the volumes 22 and 24.

Furthermore, since each amplifier 10, 12, 16, 18 is provided with an operation circuit 10B, 12B, 16B, 18B, when the switches 40A, 40B are turned on, Dolby format recording is performed on both tapes. It is also possible to perform playback using the Dolby system.

Furthermore, the tape recorder of this embodiment can perform bypass between both tapes in the following manner.

When at least one of the operation disable switches 40A and 40B is operated, the switch 28 is driven to the volume 30 side by the switch drive circuit 34, and the reproduction signal of the reproduction amplifier 16 is transmitted through the volume 30. Since the switch 26 is operated to the switch 28 side at this time, the reproduction signal is supplied to the recording amplifier 12 and recorded by the head 14 onto the first cassette tape. At this time, both amplifiers 12,
Although it is necessary to match the Droby levels between the 16 and 16, the level matching can be performed by adjusting the volume 30, and therefore high-quality bypass is performed.

Further, when the operation invalidation switches 40A and 40B are both turned off and the operations of the operation circuits 12B and 16B are invalidated and normal dubbing is performed, the switch driving circuit 34 turns off the switch 28.
is driven to the semi-fixed resistor 32 side, and the reproduction amplifier 16
The reproduced signal is supplied to the recording section 12 via the semi-fixed resistor 32 and the switch 26, and is recorded by the head 14 onto the first cassette tape. At this time, the semi-fixed resistor 32 has been adjusted in advance when the tape recorder is assembled, and the levels between the amplifiers 12 and 16 have been adjusted in advance, so when such a normal bypass is performed, the volume 30 There is no need to perform this operation.

As explained above, according to the present invention, when bypass is performed using the so-called Dolby system, a volume is automatically inserted between the tape playback system and the tape recording system to adjust the levels of the two, and When dubbing is performed, a semi-fixed resistor is inserted between the two and the level is fixed, so dubbing can be started immediately and failures during dubbing can be reduced.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a conventional tape recorder, and FIG. 2 is a block diagram of a tape recorder according to the present invention. 12...Recording amplifier, 12B...Compression operation circuit, 1
6... Reproduction amplifier, 16B... Expansion operation circuit, 26...
Changeover switch, 28...Bypass switch, 30...
Volume for recording level adjustment, 34...Switch drive circuit, 40A, 40B...Disable switch.

Claims (1)

[Scope of Claims] 1. A tape recording system that performs recording on a first tape that has been set, and a tape playback system that plays back a second tape that has been set; In a tape recorder configured to record a playback signal onto a first tape, the tape recording system is provided with a compression operation circuit and a first operation disabling switch for disabling the operation of the compression operation circuit, and The tape playback system is provided with an expansion operation circuit that performs a signal operation opposite to that of the compression operation circuit, and a second operation disable switch that disables the operation of the expansion operation circuit. On the side there is a volume for adjusting the recording level to which the playback signal is supplied, and a volume for adjusting the recording level that is linked to the first and second operation disable switches and is bypassed only when both operation disable switches are in the inactive state. 1. A tape recorder comprising a bypass switch for supplying a playback signal to a tape recording system.