JPH0614237B2 - Recording / playback device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing device suitable for use in a learning device such as language practice.

BACKGROUND ART AND PROBLEMS The conventional tape recorder for language practice for learning English or the like reproduces the tape on which the model voice is recorded and records the learner's voice on the tape on the tape. , The model voice and the learner's voice can be compared. However, the recorded learner's voice alone is not automatically and repeatedly reproduced an arbitrary number of times. In this kind of language practice tape recorder, if the learner can automatically reproduce his or her voice many times, a new learning method can be developed.
The learning effect can be further improved.

An object of the present invention is to meet the above-mentioned demand, and to provide a tape recorder for language practice which can automatically reproduce only the voice of a learner.

SUMMARY OF THE INVENTION The present invention uses two semiconductor memories in which a model and a learner's voice are selectively recorded, and the learner's voice is automatically reproduced by selectively reading the model and the learner's voice. It was done like this.

Embodiment FIG. 1 shows an embodiment in which the present invention is applied to a recording / reproducing apparatus 2 using a known talking card 1.

The talking card 1 is provided with a magnetic tape 3 on the lower edge of which a model voice is recorded for a length of about 8 seconds. The recording / reproducing apparatus 2 is provided with a card running groove 4 on its upper surface, a start button 5, a mode selection knob 6, a slow reproduction button 7, a volume knob 8 and the like, and a microphone jack 9 and a speaker 10 on the other side surfaces. , Microphone on
A lamp 11 and the like are provided. A microphone 12 is connected to the microphone jack 9.

In the recording / reproducing apparatus 2, when the card 1 is inserted from one end of the card running groove 4, a card detection switch (not shown) is closed and the card reproducing mode is set. The card 1 runs in the direction of arrow a by the capstan provided in the running groove 4, and the tape 3 is played back by the playing head also provided in the running groove 4. When the reproduction of the tape 3 is completed in about 8 seconds, the card 1 stops at the other end of the running groove 4.

FIG. 2 shows an embodiment of the circuit. In this embodiment, two semiconductor memories 13 and 14 are provided, and the recording / reproducing apparatus 2 uses these memories 13 and 14 in the following mode. It is made to be used.

A, card mode A mode in which the talking voice signal of the card 1 is recorded in, for example, one memory 13 and the voice signal from the microphone 12 is recorded in the other memory 14 by using the talking card 1 and the microphone 12. , B, c modes. The modes a, b and c are selected by the mode selection switch 6.

a mode First, the card 1 is reproduced and the reproduced voice signal of the model is recorded in the memory 13. At this time, the reproduced sound is heard from the speaker 10. Next, the learner waits for the microphone ON lamp 11 to light up or the sound emitted from the speaker 10 to be heard by the learner.
2 is used to respond or repeat the reproduced sound, and the audio signal is recorded in the memory 14. When this recording is completed, the playback mode is automatically activated, and the memory 13 is first read only once and the voice of the model of the card 1 is output to the speaker 10.
Can hear from. Then, the memory 14 is read only once, and the voice of the learner can be heard from the speaker 10.

b mode After the end of the a mode, when the b mode is selected and the start button 5 is pressed, the playback mode is entered. First, the memory 13 is read only once, and the voice of the model of the card 1 is output to the speaker 1.
You can hear from 0. Then, the memory 14 is read only once, and the voice of the learner can be heard from the speaker 10.

c-mode When this c-mode is selected and the start button 5 is pressed after the end of the a-mode, the memory 13 is first read and the voice of the model is heard. Next, the learner's voice is newly recorded in the memory 14 by the microphone 12. When this recording is completed, the playback mode is entered, and the memory 13 is first read and the model voice can be heard. Then, the memory 14 is read and the above-mentioned new voice of the learner can be heard.

In addition, while the b mode and the c mode are being performed,
Immediately after inserting the card 1, the mode is returned to the a mode.

B, mimicry mode In this mode, the card 1 is not used and only the microphone 12 is used.
When recorded in 3 or 14, this is immediately read out only once and can be heard from the speaker 10.

C. Repeat Play Mode In the above card mode and mimicry mode, if the start button 5 is held down while the memories 13 and 14 are being read, the memories 13 and 14 are repeatedly read and the model or learner's You can listen to the sound as many times as you like.

D, slow playback mode In the card mode, imitation mode and repeat playback mode, by pressing the slow playback button 7,
1 / without changing the frequency of the reproduced sound from the speaker 10.
Slow playback at 2x speed or 2 / 3x speed can be performed.
For example, by reading each address of the memories 13 and 14 twice, it is possible to perform pitch-invariant slow reproduction at 1/2 speed.

In the card mode and the mimicry mode, when recording the voice of the learner, the recording is started after waiting for the lighting of the microphone ON lamp 11 or the dial tone. In each of the above modes, the speaker 10 is used at the time of recording.
May be appropriately muted.

The modes A to C described above are examples, and the card 1,
Various usage modes other than the above can be created by variously changing the usage of the microphone 12, the memories 13, 14, and the like.

Next, the configuration and operation of the circuit of FIG. 2 will be described for the case of the a mode described above.

In FIG. 2, the control circuit 15 applies a write signal and a read signal to the memories 13 and 14 at a predetermined timing, and a switch circuit 16 including a multiplexer.
A switching signal for switching 17 is applied at a predetermined timing. Further, the memories 13 and 14 have a capacity in which a voice of approximately 8 seconds is written. First, when the card 1 is inserted into the running groove 4 shown in FIG. 1, the card detection switch 18 shown in FIG. 2 is turned on. As a result, the card reproduction mode, that is, the memory recording mode is entered, and the card 1 runs and the tape 3 is reproduced by the head 19 for about 8 seconds. The reproduced sound signal of the model is the amplifier 20.
After being widened with, pass through the contact a side of the switch circuit 16,
Furthermore, the band is limited by the low-pass filter 21 and A /
It is added to the D converter 22. The A / D converted digital audio signal is written in the memory 13. At this time, the digital audio signal is applied to the D / A converter 23 through the contact a side of the switch circuit 17 and converted into the original analog audio signal. This analog audio signal has its clock component removed by a low-pass filter 24, then amplified by an amplifier 25 and added to the speaker 10.

When the reproduction of the card 1 is completed, the learner's voice signal is added from the microphone 12, and this voice signal is sent to the amplifier 3
3, the contact b of the switch circuit 16 and the low-pass filter 2
1 to the A / D converter 22. The learner's digital voice signal that has been A / D converted is added to the memory 14. At this time, the speaker 10 may be sounded if necessary. When the speaker 10 is not sounded, the switch circuit 17 is configured to select the zero level output.

Immediately after the writing to the memories 13 and 14 is completed as described above, the read mode is set, the memory 13 is first read, and then the memory 14 is read. The read digital audio signal is sequentially taken out from the contacts b and c of the switch circuit 17, converted into an analog audio signal by the D / A converter 23, and then applied to the speaker 10 through the low-pass filter 24 and the amplifier 25.

After the operation of the mode a is completed, the mode selection switch 6 is switched to select the mode, and the start button 5
By operating the slow reproduction switch 7, it is possible to arbitrarily select the b, c modes, the repeated reproduction mode, the slow reproduction mode, or the like described above. All the operations in these modes are executed under the predetermined control by the control circuit 15.

In the present embodiment, when the memories 13 and 14 are read out, only the voice part actually spoken by the model and only the voice part actually spoken by the learner are selected from the signals written in the memories 13 and 14. I am trying to read it.
For this reason, the voice detection circuit 26 detects the voice portion when writing to the memories 13 and 14. Then, at the time of reading, the portion from the head address of the voice portion to the end address of the voice portion of the memories 13 and 14 is read based on the above detection.

FIG. 3 shows an embodiment of the voice detection circuit 26, and FIG. 4 shows its timing chart.

As described above, writing to the memory 13 or 14 is performed when the switch 18 is turned on when the card 1 is inserted.
Alternatively, it is started when the microphone ON lamp 11 is turned on or when a dial tone is emitted, at which time the memory 13 or 14 is set to
The output of the / D converter 22 starts to be added.

In FIG. 3 and FIG. 4, A /
The sine bit of the digital signal output from the D converter 22 is added to the monomultis 27 and 28. The time constant of the mono-multi 27 is τ ₁ = R ₁ C by the switch 29.
And τ ₂ = R ₂ C. The switch 29 is initially closed by the contact a, and the time constant τ ₁ is selected. Also Mono Multi 28
Is an ordinary trigger type with a time constant τ ₃ . Note that τ ₁ , τ ₂ , and τ ₃ are, for example, τ ₁ = 20 msec,
τ ₂ = 0.5 sec and τ ₃ = 0.2 sec are selected.

In the silent state from the start of writing to the memory 13 or 14, if the noise of a predetermined level or higher is present for a short period as shown in FIG.
8 is triggered and its Q ₁ and Q ₂ outputs are “H”
However, since τ ₁ is short, Q ₁ immediately becomes “L” (low level), and it is determined to be noise. The fall of the Q ₁ output resets the monomulti 28, and the Q ₂ output also becomes “L”.

If continuous audio signals are input in this state, the A /
The D output triggers the monomultis 27 and 28, and the Q ₁ output becomes “H”. This Q ₁ output is ignored even if the voice is interrupted within τ ₁ , and holds “H”. On the other hand, the Q ₂ output also becomes “H” and falls to “L” at the time of τ ₃ . This falling triggers the flip-flop 30 and its Q
₃ outputs become "H". Q ₃ output of the "H" with is applied to the control circuit 15 switches the switch 29 to the contact b. As a result, the time constant of the monomulti 27 becomes τ ₂ . Then, when τ ₂ has passed since the voice disappeared and the mono-multi 27 was triggered most, the Q ₁ output, which was determined to have surely lost the voice, falls to “L”.
At this fall, the flip-flop 30 is reset and Q
₃ outputs become "L".

The rising time t ₁ of this Q ₃ output is τ from the beginning of the actual voice.
It is delayed by ₃ , and the falling time point t ₂ is delayed by τ ₂ from the end of the actual voice. The control circuit 15 obtains the corresponding address of the memory 13 or 14 from the points t ₁ and t ₂ of this Q ₃ output. An address traced back by τ ₄ (0.5 sec, for example) from the address of the next collision t ₁ point is regarded as the beginning of the voice, and this is made the read start address at the time of reading. Further, an address traced back by τ ₅ (for example, 0.3 seconds) from the address at the point t _{2 is} not recognized as the end of the voice, and this is used as the read end address.

According to the above, at the time of reading, only the signal written between the read start address and the end address of the memories 13 and 14 is read as the audio signal, so that a useless portion is not read and the signal is read from the memory 13. The interval between the voice that is played and the voice that is read from the memory 14 can be made appropriate.

In the imitation mode described above, the memories 13 and 14 are used as follows.

First, when the voice from the microphone 12 is recorded in the memory 13, the voice is immediately read. After being read once, the memory 13 is in the reproduction standby state, and at the same time, the memory 14 is in the recording standby state. Therefore, if the start button 5 is pressed, the memory 13 can be read any number of times. When a new voice is recorded by the microphone 12, the new voice is recorded in the memory 14 and read immediately after recording. After this, the memory 14 is in the reproduction standby state.

FIG. 5 shows another embodiment of the memory configuration in the imitation mode, and the same parts as those in FIG. 2 are designated by the same reference numerals.

This embodiment uses a buffer memory 3 having a capacity of about 0.5 seconds.
A main memory 32 having a capacity of about 1 and 8 seconds is provided.

When writing, the memory 31 first starts writing. Writing to the memory 31 is performed by the voice detection circuit 26.
Is endlessly performed in a cycle of 0.5 seconds until voice detection is performed at point t _{1 in} FIG. When the speech detection is made at t ₁ point, along with the address of the t ₁ point is stored,
The writing to the memory 31 is stopped and the writing to the memory 32 is started. The stored t ₁ point is at a position delayed by τ ₃ from the actual head of the voice, as is apparent from FIG. The head portion of this actual voice is written in the memory 31. Therefore, in the case of reading, first, reading is started from the address next to the address of t ₁ point of the memory 31, when the end address is reached, it returns to the start address, and from there, the address of t ₁ point is read, then The main memory 32 is read out. By performing the read operation in this manner, the read start address of the memory 31 becomes substantially equal to the read start address of FIG. 4, and it becomes possible to read a portion substantially the same as the audio portion of FIG. .

The case where the present invention is applied to a tape recorder for language practice has been described above. However, the present invention also applies to music, reading,
It can be applied to learning devices such as lines.

Effect of the Invention Since the model voice recorded on the recording medium and the learner's voice can be easily compared, and the learner can easily listen to his / her own voice any number of times, the interest in learning is increased. Can increase the learning effect. Since various use modes can be set by combining the writing and reading timings of the two memories,
It is possible to develop new learning methods in the field of such learning devices.

[Brief description of drawings]

1 is an external perspective view showing an embodiment of the present invention, FIG. 2 is a block diagram showing an embodiment of the present invention, FIG. 3 is a block diagram showing an embodiment of the voice detecting circuit of FIG. 2, and FIG. FIG. 5 is a timing chart of FIG. 3, and FIG. 5 is a block diagram showing another embodiment when the imitation mode is performed. In the reference numerals used in the drawings, 12 ... Microphone 13, 14 ... Memory 15 ... Control circuit 19 ... Reproduction head.

Claims (1)

[Claims] 1. A reproducing device for reproducing a signal from a recording medium, a first storage device for recording a reproduction signal obtained from the reproducing device, and a second storage device for recording an input signal from a microphone. Conversion means for selecting a signal to be recorded in the first and second storage devices and the recorded signal and converting it into a reproduced sound; and for recording the reproduction signal in the first storage device as a reproduction mode and performing the conversion. The input signal is recorded in a second storage device after being supplied to the means, and then the signal recorded in the first storage device is supplied to the conversion means and then recorded in the second storage device. A recording / reproducing apparatus comprising: the first and second storage devices and a control means for controlling the converting means so as to supply the converted signal to the converting means.