JPS5819566Y2 - magnetic recording and playback device - Google Patents

Description

[Detailed description of the invention] This invention relates to a magnetic recording/playback device used in a language practice system. During mutual communication in the language practice system, an audio signal from the teacher stops the tape running on the student's magnetic recording/playback device. The purpose of this invention is to provide a device that allows

In conventional language practice systems and language practice magnetic recording and reproducing devices, when the teacher and student want to talk to each other, the student operates a call switch to call the teacher. In response to the student's call, the teacher inputs an audio signal to the mutual communication terminal of the magnetic recording and reproducing device for language practice on the student's side, so that the teacher can communicate with the student.
At this time, if the device on the student's side is in the tape playback state, the student must stop the device in order to eliminate unnecessary tape running.

The present invention automatically stops the student's device when an audio signal is received from the teacher's side only when the student's device is in the playback mode during such mutual communication.

The present invention will be described below with reference to four aspects.

FIG. 1 shows an embodiment of the present invention.

In the same figure, 1, 2° 3, 4, 10.15 are resistances, 16
．． 17 is a capacitor, 5, 6, 7, 8, 12 are transistors, 9 is a diode, 11 is a tape drive motor, 13
is a power supply, 14 is a mutual communication terminal, 18 is an amplifier, 19
is a rectifier circuit which operates the tape drive motor 11 by direct current and alternating current signals applied to the mutual communication terminal 14.
This controls the rotation and stopping of the motor.

It is assumed that the resistors 1 to 4 and the transistors 5, 6, and 8 constitute a bistable multivibrator, and the transistor 8 is in a non-conducting state until a DC input is applied to the intercommunication power terminal 14.

Therefore, until a DC input is applied to terminal 14, transistor 6 is in a non-conducting state.

In addition, when a voice signal is input to the mutual communication terminal, the transistor 7 transmits the signal to the amplifier 18 via the capacitor 11.
In addition to this, it is amplified and rectified by a rectifier circuit 19, and the rectified output is applied to the base of the transistor 10 to make it conductive.It is set so that even if a DC input is applied to the terminal 14, it will not become conductive by itself. .

Therefore, until a DC signal is applied to terminal 14, transistor 6 of the bistable multivibrator is non-conducting, and transistor 5 is forward biased through resistor 3.4 and is conducting.

- Since the diode 9 is reverse biased by the resistor 4 and is in a cut-off state, the sword transistor 12 is connected to the resistor 1.
0, it is forward biased and conductive.

Therefore, the tape drive motor 11 rotates, and if the mechanism is in the tape running state at this time, the tape runs.

Next, when a DC signal is applied to the interactive communication terminal 14,
Transistor 8 is forward biased through resistor 15 and becomes conductive, but since transistor 5 is conductive, transistor 6 is not forward biased through resistor 1.2 and becomes non-conductive even if transistor 8 becomes conductive. It remains as it is.

Therefore, transistor 12 remains conductive, motor 11 rotates, and the tape continues to run.

Next, when an alternating current signal (audio signal) is inputted to the intercommunication human power terminal 14 while the direct current input is being applied, the alternating current signal is inputted to the amplifier 18 through the compression capacitor 11, amplified, and rectified by the rectifier circuit 19.

The rectified output biases transistor 1 in the forward direction, and transistor 7 becomes conductive while an alternating current signal is input to intercommunication terminal 14.

Therefore, transistor 5 is reversed from a conductive state to a non-conductive state, and transistor 6 is reversed from a non-conductive state to a conductive state.

This state continues even if the audio signal disappears and the transistor 7 changes from a conductive state to a non-conductive state.

Therefore, the transistor 12 becomes non-conductive at the same time as the transistor 6 changes from a non-conductive state to a conductive state, that is, when an AC signal is input to the terminal 14, the motor 11 stops, and the tape also stops running.

To rotate the motor 11, it is sufficient to turn off the DC input signal applied to the terminal 14.

Then, transistor 8 becomes non-conductive, so transistor 6 also becomes non-conductive, and transistor 12 becomes non-conductive.
becomes conductive, so the motor 11 rotates and the tape runs again.

In the embodiment shown in FIG. 1, the reciprocal communication terminal 14 is supplied with a direct current input and then an alternating current signal. Tape running also stops in the recording state (a state in which one's own practice sounds are recorded on a separate track while playing back the teaching materials).

This is inconvenient because if the teaching material is being recorded, the teaching material will be cut off in the middle.

Therefore, it is necessary to stop the running of the tape depending on the state of use of the magnetic recording/reproducing device.

FIGS. 2 and 3 show an embodiment of the present invention in which the running of the tape is stopped only when the tape is in the playback state.

In FIG. 2, reference numeral 20 denotes a switch whose movable contact 20a switches from the fixed contact 20b to 20c only during recording or LL recording, and this switch allows the input to the amplifier 18 to be applied only during playback.

A switch such as the switch 20, which is turned on only during playback, is not limited to the insertion location shown in FIG. 2, but may be placed at any position where the same function can be performed without damaging the original function of the device.
For example, it may be inserted at 21'P22 in FIG.

Also, contrary to switch 20, a switch that is conductive only during playback may be connected between points 20 and 210 in the figure and the ground. Although a mechanical switch is used in this example, it may be replaced with an electrical circuit as shown in FIG.

In FIG. 3, transistors 23 and 24 and resistors 25 to
28 constitutes a bistable multivibrator, and in this bistable multivibrator, the transistor 24 is made non-conductive only in the playback state by a circuit not shown, and the transistor 24 is made conductive in other states, such as the recording state fLL recording state. state, the transistor 8 is rendered non-conductive through the diode 29.

As described above, according to the present invention, when communicating with each other in a language practice system, the operation that was conventionally performed on the student's side by setting the tape running to a stopped state depending on the state of the device can be changed to the operation that the teacher naturally performs, that is, the manual terminal for mutual communication. The tape running can be automatically stopped in conjunction with the teacher's operation of loading the audio signal, which reduces unnecessary operations on the part of the student and simplifies handling.

[Brief explanation of the drawing]

FIG. 1 shows a circuit according to one embodiment of the present invention, and FIGS. 2 and 3 respectively show circuits according to other embodiments of the present invention. 6...First transistor, 5...Second transistor, 11...Tape drive motor, 12...Switching transistor, 14...
・・・・・・Human power terminal for mutual communication.

Claims (2)

[Scope of utility model registration request] (1) A common intercommunication terminal to which a DC signal and an AC signal are applied, a bistable multivibrator triggered by the DC signal and the AC signal, a tape drive motor, the bistable multivibrator and the tape. a switching device disposed between the drive motors in which a bistable multivibrator rotates the time motor in a first stable state and stops the time motor in a second stable state; and a switching device that simultaneously transmits a DC signal and an AC signal to the mutual communication terminal. Magnetic recording and playback characterized by comprising a control device that brings the time bistable multivibrator into a second stable state when a DC signal is applied, and puts the bistable multivibrator into a first stable state when a DC signal is no longer applied. Device. (2) The control device includes a third transistor connected in series between the emitter of the first transistor of the first and second transistors constituting the bistable multivibrator and ground, and the second transistor. A fourth transistor is connected in parallel between the base and emitter of the third transistor, a DC signal from the mutual communication input terminal is applied to the base of the third transistor, and a direct current signal from the mutual communication input terminal is applied to the base of the fourth transistor. The structure is such that an alternating current signal is converted to direct current through a rectifier circuit and applied, and when only a direct current signal is applied to the mutual communication terminal, the third transistor is turned on and the third transistor is turned on. When the first transistor is non-conductive, the bistable multivibrator is in the first stable state, and when an AC signal is applied to the intercommunication terminal in a manner superimposed on the DC signal, the fourth transistor is conductive and the bistable multivibrator is in the first stable state. The bistable multivibrator is reversed from the first stable state to the second stable state when the transistor changes from the conducting state to the non-conducting state, and when the DC signal is no longer applied to the intercommunication terminal, the third transistor The magnetic recording and reproducing device according to claim 1, wherein the bistable multivibrator returns to the first stable state when the first transistor returns from the conducting state to the non-conducting state. .