JPS6017048Y2 - language practice tape recorder - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a tape recorder, particularly a tape recorder for language practice.

A tape recorder for language practice is designed so that while listening to the teacher's voice recorded on the teacher's track, the student's own voice is recorded on the student's track and then played back and listened to to compare with the student's pronunciation.

With such a tape recorder, while playing back the teacher's voice, external noise is input from the microphone and recorded on the student track, and when a tape recorded in this way is played back, the clarity of the teacher's voice deteriorates. do.

The present invention has been developed in view of these points, and will be described in detail below with reference to the illustrated embodiments.

In the figure, 1 corresponds to the teacher's track where the teacher's voice is recorded, and the teacher's magnetic head that plays back the teacher's voice, and 2 amplifies the signal reproduced by the teacher's magnetic head (1). 3 is a main amplifier circuit, and 4 is an output terminal to which a load such as an earphone is connected.

Reference numeral 5 denotes a student magnetic head corresponding to a student track on which the student's voice is recorded, 6 an input terminal to which a recording signal from a microphone is input, and 7 a recording signal input to the input terminal 6. This is an amplification circuit that guides the amplified signal to the student magnetic head (5).

9 is a control signal amplification circuit that derives and amplifies a part of the output signal of the preamplifier circuit 2; 9 is a rectifier circuit that rectifies the signal amplified by the control circuit 8; and 10 is an input of the amplification circuit 7. This is a muting transistor whose collector-emitter path is connected to the ground of the signal transmission circuit 11 on the side, and to whose base a control signal from the rectifier circuit 9 is applied.

The present invention is constructed as described above, and its operation will be explained next.

When the user performs an operation for language practice, the language practice state is entered, and the teacher's voice, which is a teaching material, is reproduced by the teacher's magnetic head 1 and then applied to the preamplifier circuit 2.

The signal amplified by the preamplification circuit 2 is further amplified by the main amplification circuit 3, and then outputted to an output terminal 4 to be listened to by a practitioner using an earphone or the like.

When the practitioner speaks into the microphone after listening to the teacher's voice, the signal obtained from the microphone is input to the input terminal 6, and the recording signal of the practitioner's voice input to the input terminal 6 is sent to the amplifier circuit 7. After being amplified, the signal is applied to the student's magnetic head 5 and recorded on the student's track of the magnetic tape.

When the teacher's voice is being reproduced by the teacher's magnetic head 1, the reproduced signal is amplified by the control signal amplification circuit 8, then amplified by the rectifier circuit 9, and applied to the base of the muting transistor 10. will be done.

Therefore, during this time, the muting transistor 10 is turned on and the signal transmission line 11 is grounded.

Therefore, the signal from the microphone input to the input terminal 6 is bypassed by the transistor 11.
Signals such as noise are not recorded on the student's track by the student's magnetic head 5.

When the teacher's voice is being played back in this way, the muting transistor 10 is turned on and the student track is left unrecorded. The intelligibility of the teacher's voice does not decrease when comparing it to the recording.

In this case, the student magnetic head 5 operates as a reproducing head.

Although the present embodiment has been described with reference to the case where the control signal amplification circuit 8 is provided, it is not necessary if the gain of the preamplification circuit 2 is sufficiently large.

In addition, the muting transistor 10 is connected to the amplifier circuit 7.
Although the case where it is provided on the input side has been described, it is of course possible to provide it on the output side.

As explained above, according to the present invention, a very simple configuration prevents signals such as noise input from the microphone during playback of the teacher's voice from being recorded on the student track. It is possible to prevent voice intelligibility from deteriorating, and the present invention has great practical value.

[Brief explanation of the drawing]

The illustrated circuit is one embodiment of the present invention. Explanation of main figure numbers, 1...Magnetic head for teachers, 5
....Magnetic head for students, 8..Control signal amplification circuit, 9..Rectification circuit, 1o, tune, muting transistor.

Claims (1)

[Scope of utility model registration request] A teacher's magnetic head that corresponds to the teacher's track where the teacher's voice is recorded and plays back the teacher's voice, and a student's magnetic head that corresponds to the student's track and records the student's voice. and a rectifier circuit that rectifies the signal reproduced by the teacher's magnetic head, and a collector-emitter path is connected between the signal transmission path to the student's magnetic head and ground, and from the rectifier circuit to the base. and a muting transistor to which a control signal is applied, and when the teacher's voice is being reproduced on the teacher's magnetic head, the muting transistor bypasses the signal from the student's magnetic head. A tape recorder for language practice featuring the following features: