JPH0325285Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention relates to a tape recorder, in which two magnetic tape recording/reproducing devices are housed in one set, and it is possible to play back, simultaneously record, or dub. The present invention relates to a tape recorder configured to.

BACKGROUND OF THE INVENTION In recent years, tape recorders have become popular in which two magnetic tape recording/reproducing devices are housed in one set, and the tape recorders are constructed so that each can be played back, simultaneously recorded, or dubbed. FIG. 1 shows a block diagram of an example of a conventional tape recorder of this type.

In the figure, during dubbing recording, switch _S1 is connected to terminal a, while switch _S2 is connected to terminal R. The signal reproduced by the magnetic head 1 from the magnetic tape (not shown) of device A is transmitted to the magnetic head of device B via a reproduction amplifier 2, a switch S ₁ , a noise limiting circuit (hereinafter referred to as NR circuit) 3, and a recording amplifier 4. The signal is supplied to the tape 5 and recorded on a magnetic tape (not shown), and is also taken out from the output terminal 6 as a monitor output.

On the other hand, when recording an external signal with device B, switch _S1 is connected to terminal b, while switch _S2 is connected to terminal R. The external input signal that has entered the terminal 7 is supplied to the magnetic head 5 via the switch S ₁ , the NR circuit 3, and the recording amplifier 4, and is also taken out from the terminal 6.

Here, the NR circuit 3 has encoding characteristics when switch S ₂ is connected to terminal R during simultaneous recording or dubbing recording, and decoding characteristics when switch S ₂ is connected to terminal P during playback. Can be switched. For example, this is a switch
The structure is configured to obtain each of the above characteristics by differentiating the applied voltage inside the NR circuit 3 when connecting S ₂ to terminal R and the applied voltage inside NR circuit 3 when connecting switch S ₂ to terminal P. has been done.

Problems that the invention attempts to solve
Since circuit 3 has encoding characteristics, NR
The reproduction signal of the magnetic tape of device A, which has already been encoded in circuit 3, is encoded again in NR circuit 3, and as a result, the level and frequency characteristics of the signal become abnormal, and normal dubbing cannot be performed. Further, since the monitor output has the same encoded characteristics, there are problems such as unnaturalness.

Means for Solving the Problems The present invention includes a signal switching switch _S1 that switches between an external input signal and an encoded playback signal;
A characteristic changeover switch S3 that changes the characteristic of the noise limiting circuit ₃ so as to impart encoding characteristics or decode characteristics to the signal selected by the signal changeover switch _S1 , a decode characteristic selection side terminal P of the characteristic changeover switch _S3 , and noise. One terminal a' is connected to the limiting circuit 3, and the other terminal b' is connected to the noise limiting circuit 3 via the movable contact of the characteristic changeover switch _S3 and the encode characteristic selection side terminal R. , a switch _S1 ' that is linked to the switching operation of the signal changeover switch S1', and a switch that is linked to the switching operation of the signal changeover switch _S1 '.
S1' is switched to one terminal _a' in conjunction with the switching operation of the signal changeover switch _S1 , which is switched to the playback signal side a, in the recording mode and playback mode of the encoded playback signal, and the characteristic changeover switch By imparting decoding characteristics to the playback signal encoded in the noise limiting circuit 3 regardless of the switching operation of _S3 , the playback signal that is not encoded is input from the noise limiting circuit 3, and when the external input signal is in the recording mode. , is switched to the other terminal b' in conjunction with the switching operation of the signal changeover switch _S1 , which is switched to the external input signal side b, and the characteristic changeover switch _S3
The movable contact is switched to the encoding characteristic selection side terminal R, and the encoding characteristic is given to the external input signal in the noise limiting circuit 3, so that the encoded external input signal is output from the noise limiting circuit 3. The above problem has been solved, and one embodiment thereof will be described below with reference to FIG. 2.

Embodiment FIG. 2 shows a block system diagram of an embodiment of the tape recorder according to the present invention, in which the same components as in FIG. 1 are given the same numbers. In the figure, S ₁ ' is a switch that is linked to switch S ₁ ; when switch S ₁ is connected to terminal a, it is connected to terminal a', and when switch S ₁ is connected to terminal b, it is connected to terminal b'. It is said that the configuration is as follows. The movable contact piece of switch S ₃ is terminal b' of switch S ₁ ', and the terminal P is terminal of switch S ₁ '.
connected to a′.

When dubbing recording, connect switch S ₁ to terminal a and switch S ₃ to terminal R. Switch S ₁
By connecting to terminal a of switch S ₁ ′ becomes terminal
connected to a′. A reproduction signal from the reproduction amplifier 2 is supplied to the magnetic head 5 via the switch S ₁ , the NR circuit 3, and the recording amplifier 4, and is also taken out from the terminal 6.

In this case, switch S ₃ is connected to terminal R, and switch S ₁ ′ is connected to terminal a′, so
The NR circuit 3 is put into a decoding state. As a result, the playback signal from the playback amplifier 2 is not encoded again and becomes an abnormal signal unlike the conventional circuit, and normal dubbing can be performed.
Furthermore, natural monitor output can be obtained.

Next, when recording an external input signal, switch S ₁
Connect to terminal B and switch _S3 to terminal R. The connection of switch S ₁ to terminal b connects switch S ₁ ' to terminal b'. The external input signal that has entered the terminal 7 is supplied to the magnetic head 5 via the switch S ₁ , the NR circuit 3, and the recording amplifier 4, and is also taken out from the terminal 6.

In this case, switch S ₃ is connected to terminal R, and switch S ₁ ' is connected to terminal b', so
The NR circuit 3 is placed in an encoding state. As a result, the external input signal from the terminal 7 is encoded by the NR circuit 3 and recorded on the magnetic tape.

On the other hand, during playback, switch _S3 is connected to terminal P. At this time, the NR circuit 3 is brought into the decoding state regardless of the connection position of the movable contacts of the switches S ₁ and S ₁ '. Thereby, the reproduction signal from the reproduction amplifier 2 is decoded by the NR circuit 3 and taken out.

In addition, in order to configure the NR circuit 3 to switch its characteristics to flat characteristics (i.e., a state without noise limiting effect), the NR circuit 3 must be equipped with switches S ₃ and S ₁ '.
An off switch may be provided to disable the noise limiting operation.

Effects As described above, according to the present invention, especially during dubbing recording, the noise limiting circuit always has decoding characteristics, so that there is no risk of re-encoding a playback signal that has already been encoded.
It is possible to perform normal dubbing, that is, it is possible to prevent the encoded playback signal from being given the encoder characteristics again due to the user's careless erroneous switching operation of the characteristic changeover switch. The reproduced signal can be used as a recording signal having flat signal level and frequency characteristics, and a natural monitor output can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block system diagram of an example of a conventional tape recorder, and FIG. 2 is a block system diagram of an embodiment of the tape recorder according to the present invention. 1, 5...Magnetic head, 2...Reproduction amplifier, 3...Noise limiting circuit, 4...Recording amplifier, 7...External signal input terminal, _S1 , _S1 ', _S3 ...Switch.

Claims (1)

[Claims for Utility Model Registration] A signal changeover switch that switches between an external input signal and an encoded playback signal, and characteristics of a noise limiting circuit that imparts encoding characteristics or decoding characteristics to the signal selected by the signal changeover switch. one terminal connected respectively to the decode characteristic selection side terminal of the characteristic changeover switch and the noise limiting circuit, and the characteristic changeover switch that switches the characteristic selection switch through the movable contact and the encode characteristic selection side terminal of the characteristic changeover switch the other terminal connected to the noise limiting circuit, and a switch that is linked to the switching operation of the signal changeover switch, and the linked switch is configured to: It is switched to the one terminal in conjunction with the switching operation of the signal changeover switch that is switched to the signal side, and decoding characteristics are imparted to the reproduced signal encoded in the noise limiting circuit, regardless of the switching operation of the characteristic changeover switch. As a result, an unencoded playback signal is output from the noise limiting circuit, and when the external input signal is in recording mode, the signal is switched to the external input signal side in conjunction with the switching operation of the signal changeover switch, which is switched to the external input signal side. and the movable contact of the characteristic changeover switch is switched to the encoding characteristic selection side terminal, and the encoded characteristic is given to the external input signal in the noise limiting circuit. A tape recorder characterized in that an input signal is output.