JPH0614242Y2 - Tape recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is directed to a tape recorder having an LL (Language Laboratory) function, in particular, without using a two-channel configuration.
The present invention relates to a tape recorder capable of achieving the LL function.

[Prior Art] As a teaching material device used for mastering a foreign language such as English or German, a tape recorder having an LL function is often used.

The tape recorder used for such purposes as language practice needs to have a configuration capable of recording and reproducing in two channels.

It records the teacher's voice signal on the first channel and the second channel
This is because it is necessary to have a function of recording the student's voice signal in the channel and freely recording and reproducing them.

[Problems to be Solved by the Invention] By the way, in the case of such a tape recorder having an LL function, a tape recorder having a 2-channel recording / reproducing system is indispensable.

Therefore, this LL function cannot be used in a tape recorder capable of recording and reproducing only one channel. Further, in such a two-channel tape recorder, in order to reproduce the audio signal for the teaching material recorded on the tape, it is necessary to return the tape to the original position and reproduce it. It was complicated.

In view of this, the present invention proposes a tape recorder capable of having the LL function even in a tape recorder capable of recording and reproducing only one channel.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention has a memory for storing an audio signal and a recording / reproducing control circuit for the memory, and the control circuit reproduces from a tape. Writing means for A / D converting the read audio signal or the audio signal input from the microphone and writing it in the memory, and reading until the read audio signal is A / D converted and sent to the audio output system. Means and control means for controlling them are provided, and at the time of LL, the reproduction signal from the tape is written for a first predetermined time, and thereafter, the audio signal from the microphone is written for a second predetermined time. , After the second predetermined time has elapsed, the mode automatically shifts to the read mode, and the audio signals written in the first and second predetermined times can be sequentially and repeatedly reproduced. It is characterized by having done so.

"Operation" As the memory 25 for storing the voice signal, when the capacity is full, the memory 25 circulates as if rewriting in order from the oldest voice signal, and at the time of reading, it is read sequentially from the oldest signal remaining in the memory 25. To circulate
The write and read states are controlled.

Control circuit for memory 25 (IC recording / reuse control circuit) 2
At 0, the following control operation is performed.

That is, in the LL mode, the reproduction signal is written from the tape 1 for the first predetermined time Ta, and then the audio signal from the microphone 11 is written for the second predetermined time Tb. Then, after the elapse of the second predetermined time Tb, the mode automatically shifts to the read mode.

Thereafter, the audio signals written in the first and second predetermined times Ta and Tb are sequentially and repeatedly reproduced in this order.

By doing so, for example, the teacher's voice signal reproduced from the tape is stored in the memory 25 for the first predetermined time Ta, and the student's voice signal input from the microphone 11 is stored during the latter half time Tb. It Therefore, the memory 25
In the first half, the teacher's voice signal is stored in the first half, and the student's voice signal is stored in the second half.

Therefore, during reproduction, the teacher's audio signal is reproduced in the first half, and the student's audio signal is reproduced in the latter half of the subsequent period.

This allows the same LL function to be achieved even with a single channel.

Further, in the LL mode, since the audio signal written in the memory 25 is only read and reproduced, there is no need to rewind the tape. Therefore, there is a practical advantage that the operation in the LL mode is extremely simple.

[Embodiment] Next, an example of the tape recorder according to the present invention will be described in detail with reference to FIG.

FIG. 1 is a system diagram of essential parts showing an example of a tape recorder according to the present invention, particularly a recording / reproducing circuit 10 thereof.

The audio signal recorded on the tape 1 is reproduced by the magnetic head 2, and is supplied to the speaker 5 via the preamplifier 3 and the main amplifier 4 to reproduce the audio signal. The audio signal input by the microphone 11 is supplied to the speaker 5 via the preamplifier (or microphone amplifier) 12 and the main amplifier 4 described above, and the input signal from the microphone 11 is reproduced.

In this invention, a memory 25 for storing a voice signal is provided and a control circuit 2 for the memory 25 is provided.
0 is provided.

A DRAM is used as the memory 25, and the control circuit (recording / reproducing control circuit for the IC memory 25) 20 rewrites the oldest signal to a newer signal in order when the memory 25 has a full write capacity. It is assumed that the writing and reading states of the memory 25 are controlled so that the memory 25 circulates and circulates so that the oldest signal remaining in the memory 25 is sequentially read at the time of reading.

In this example, the maximum writing time of the memory 25 is 8
I'm using the second one.

The control circuit 20 includes a writing unit 20A and a reading unit 20.
B and control means (CTL) 20 for controlling these
It is composed of C and.

First, the input audio signal is supplied to the filter 21 constituting the writing means 20A and limited to a predetermined frequency band, and then supplied to the A / D converter (ADC) 22 and converted into a digital signal having a predetermined number of bits. It The converted digital audio signal is stored in the memory 25 via the switching means 23 and the memory refresh control circuit (memory CTL) 24.
And is stored in a predetermined address.

The digital audio signal stored in the memory 25 is read out by the memory control circuit 24 and the switching means 23 and the reading means 20.
It is supplied to a D / A converter (DAC) 27 that constitutes B and is converted into an analog signal. The converted analog audio signal is limited to a predetermined band by the filter 28 and then sent to the main amplifier 4 side.

The switching means 23 described above is switched to the A / D converter 22 side for writing and to the D / A converter 27 side for reading. The switching means 23 is controlled by the control means 20C provided in the control circuit 20.

The control means 20C is appropriately controlled based on the output of the microcomputer 30 for controlling the main body of the tape recorder.

The driver 36 for the capstan is controlled based on the output of the microcomputer 30, and the driving state of the capstan motor 37 is controlled based on this.

Key inputs relating to a plurality of operation switches are made on the microcomputer 30.

The switch S1 is a reproduction switch for putting the tape in a reproduction state.

S2 is a function switch, and in this example LL
Two types of mode and repeat mode can be selected.

The switch S3 is a start switch for controlling writing and reading to and from the memory 25, and the microphone input state is also controlled by operating this switch S3.

In this example, by operating the switch S3, the preamplifier 12 is put into an operating state, and the input of the audio signal from the microphone 11 is received.

Reference numeral 40 is a cycle switching means for controlling the maximum writing time for the memory 25. In this example, the mode is switched between three stages of 0 seconds, 4 seconds, and 8 seconds, and in the case of 0 seconds, in principle, writing and reading to the memory 25 are prohibited. The maximum write time of the memory 25 is limited to 4 seconds in the 4-second cycle, which is a first predetermined time Ta that determines the write time and a second predetermined time that determines the read time as described later. Expressed as the sum of Tb.

Therefore, when the 8-second cycle is selected, the sum of the first and second predetermined times Ta and Tb is 8 seconds. In the example described below, the first and second predetermined times Ta and Tb are set for convenience of description.
Are equal.

The cycle switching output from the cycle switching means 40 is supplied to the control means 20C provided in the control circuit 20 to control the switching timing of the switching means 23. The cycle switching output is also supplied to the timer 41, and this timer output is input to the microcomputer 30.

By receiving this input, the on / off time for the preamplifier 12 is controlled according to the set cycle. That is, when the cycle is 0 seconds, 4 seconds, 8 seconds
The off time is controlled to be 0 second, 2 seconds, and 4 seconds.

When the function switch S2 is switched to the repeat side and the repeat mode is set, the microphone 11
The operation state of the preamplifier 12 is controlled so as to prohibit the input from, and the reading to the memory 25 is repeated with the operation of the start switch S3.

On the other hand, when the function switch S2 is switched to the LL mode side, the operation prohibition state of the preamplifier 12 is released by operating the start switch S3. Then, writing and reading with respect to the memory 25 are alternately repeated in accordance with the operation of the start switch S3, and in particular, the period (= Tb) during which the input signal from the microphone 11 is received is automatically set. Then, the write mode is extended by Tb.

Next, each operation in the repeat mode and the LL mode will be described in detail with reference to FIGS. 2 and 3.

FIG. 2 is a diagram showing an operation state when the repeat mode is selected. First, the function switch S2 is first
It is assumed that they are switched as shown by the broken line in the figure. Further, it is assumed that the 8-second cycle is selected by the cycle switching means 40.

Here, Ti (i = 1, 2 ...) In FIG. 2 corresponds to the first predetermined time Ta, and in this example, T
a is set to 4 seconds.

Now, when the reproduction switch S1 is operated, the capstan motor 37 is driven in response to this, for example, based on a command from the microcomputer 30, so that the signal from the tape 1 is reproduced. As a result of this reproduced signal being emitted through the speaker 5, the signals T1, T2, T3, T4 reproduced from the tape 1 are immediately heard from the speaker 5 as shown in FIGS.

As described above, when the reproduction switch S1 is operated, the memory 25 immediately shifts to the write mode.
The reproduced signal reproduced by the IC is recorded (IC in FIG. 2B).
・ REC section). When the start switch S3 is operated at the time when the reproduction section I has elapsed, the microcomputer 30 causes the control unit 20C to store the memory 25.
A corresponding control signal IC for switching to the reading state
(REC / PB) is supplied to the switching means 23 side.

At the same time, the stop signal is supplied from the microcomputer 30 side to the motor 37, and the tape 1 is stopped.

As a result, the digital audio signal read from the memory 25 is converted into an analog signal by the reading means 20B and then supplied to the speaker 5. Therefore, in the section II in which the start switch S3 is turned on, the audio signal from the memory 25 is reproduced, and the sound is emitted from the speaker 5 (section IC / PB in FIGS. 2B and 2C).

Start switch again at a predetermined time after this section II has elapsed
When S3 is turned on, the memory 25 transits to the write mode again. As a result, the reproduction state of the tape 1 is reached again, and the mode is changed to the tape reproduction mode and the writing mode to the memory 25 (section III in the figure).

By turning on the start switch S3 in this manner, the audio signals written in the memory 25 are sequentially reproduced, and a repeat operation is performed.

FIG. 3 is a diagram for explaining the operation in the LL mode,
In this case, the function switch S2 is switched as shown by the solid line. Then, by turning on the reproduction switch S1, the tape 1 is in the reproduction state and the memory 25 is in the writing mode.

As a result, in the section I until the start switch S3 is operated, the reproduction mode of the tape 1 is continuously executed, and the audio signal from the tape 1 is reproduced from the speaker 5 (A in FIG. 3). , D). On the other hand, the write mode is continuously executed for the memory 25 (C in the same figure).

When the start switch S3 is turned on at a predetermined time, the operation prohibition state for the preamplifier 12 is released for a predetermined time, that is, the second predetermined time Tb, and the input signal from the microphone 11 is written in the memory 25. Be done.
(Figures B and C).

When this period Tb has elapsed, the memory 25 automatically shifts to the read mode. When the start switch S3 is operated, the tape 1 stops as described above.

When the start switch S3 is operated in this way, the microphone 1
The write mode period for the memory 25 is automatically extended by Tb so that the input signal from 1 is recorded for a predetermined period Tb. When this period Tb elapses, the memory 25
The read mode for is automatically changed.

As a result, the digital audio signal read from the memory 25 is converted into an analog signal in the reading means 20B and supplied to the speaker 5 via the main amplifier 4.
Therefore, the reproduction output is the audio signal written in the memory 25 (section II in FIGS. 3C and 3).

Now, the signal read out from the memory 25 is Tc (= Ta + T) from the time point after the start switch S3 is turned on and the data is written for a predetermined period Tb.
From the time point that is traced back to b), reading is performed for Tc,
This is sequentially repeated (the repeat section in FIG. 6C).

In this example, the student's audio signal S input from the microphone 11
Then, of the teacher's audio signal reproduced from the tape 1, the teacher's audio signal T2 reproduced at the time point traced back from the start switch S3 by Ta is repeatedly reproduced.

By doing so, the audio signal S of the student can be recorded in the memory 25 after the audio signal T of the teacher. Therefore, by sequentially reproducing the information in the memory 25, the audio signal T of the teacher and the student can be recorded. , S can be reproduced alternately. With this, it is possible to achieve almost the same function as the LL function realized in the tape recorder having the two-channel structure.

When the start switch S3 is operated again, the mode is changed to the same mode as the section I (section III in the figure).

In the above example, the voice signal of the teacher and the student is recorded based on the cycle of 8 seconds at maximum, and the voice signal is played back. They are recorded one by one and are reproduced one after another.

FIG. 4 shows still another example of the present invention,
In this example, a switching means 50 is provided as a means for switching the reproduction signal reproduced from the tape 1 and the audio signal inputted from the microphone 11, and the switching means 50 is provided.
This is an example in which control is performed based on the switching signal from. It can be easily understood that the same operation as described above can be achieved in this case as well.

[Advantage of Device] As described above, according to this device, in the LL mode, the reproduction signal from the tape is written for the first predetermined time Ta, and thereafter, the audio signal from the microphone 11 is secondly written. The audio signal written for a predetermined time Tb is automatically changed to the read mode after the second predetermined time has elapsed, and the audio signals written at the first and second predetermined times are alternately and repeatedly reproduced. .

That is, when the memory capacity for storing audio signals is full, the oldest signal is rewritten in order, and at the time of reading, the oldest signal remaining in the memory is sequentially read out so that the writing / reading state of the memory is controlled. It was done.

According to this, since the voice signals of the teacher and the student can be recorded alternately, the function exactly the same as the normal LL function can be achieved only by providing the memory and its control circuit. Therefore, only the recording / reproducing system for one channel is sufficient, and the configuration can be simplified and the cost can be reduced.

Further, according to this invention, there is no need to rewind and play the tape, and the operation is very simple. Therefore, the present invention is extremely suitable when applied to the tape recorder having the LL function as described above.

[Brief description of drawings]

FIG. 1 is a system diagram of an essential part showing an example of a tape recorder having an LL function according to the present invention, FIG. 2 is a diagram for explaining the operation in a repeat mode, and FIG. 3 is a diagram for explaining an operation in the LL mode. FIG. 4 is a main part system showing still another example of the present invention. 1 ... tape 10 ... recording / reproducing circuit 11 ... microphone 20 ... IC recording / reproducing control circuit 25 ... memory 20A ... writing means 20B ... reading means 20C ... control means 30 ... microcomputer S1 ... Regeneration switch S2 …… Function switch S3 …… Start switch 37 …… Capistan drive motor 40 …… Cycle switching means

Claims (1)

[Scope of utility model registration request] 1. A memory for storing an audio signal and a recording / reproducing control circuit for the memory, wherein the audio signal reproduced from a tape or the audio signal input from a microphone is A / D converted. Then, there are provided a writing means for writing to the memory, a reading means for D / A converting the read audio signal and sending it to an audio output system, and a control means for controlling these. Sometimes the reproduction signal from the tape is written for a first predetermined time, and thereafter, the audio signal from the microphone is written for a second predetermined time, and after the second predetermined time elapses, the mode automatically changes to the reading mode. The tape recorder is characterized in that the audio signals respectively written at the first and second predetermined times are sequentially and repeatedly reproduced.