JPH0136174B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for magnetically, electrically, and optically reproducing signals from a recording medium traveling by a mechanical mechanism.

<Prior art> Conventionally, in a device that magnetically, electrically, or optically reproduces a signal from a moving recording medium using a mechanical mechanism, if a human cannot recognize the reproduced signal, the previous signal is reproduced again. In order to do this, the previously reproduced signal can be repeatedly reproduced by first stopping the recording medium, then causing it to travel in the opposite direction for a certain period of time, then stopping it, and then causing it to travel in the forward direction again. However, with this method,
Since it requires mechanical operation, it cannot be played quickly, and it is difficult to run in the opposite direction for the length of the part you want to play, so if it goes too far or hits the front, it may be necessary to run in the opposite direction Therefore, mechanical strain is applied, and if this is done frequently, the reliability of the equipment deteriorates and the lifespan is deteriorated.

<Object of the present invention> In order to eliminate the drawbacks of the prior art described above, an object of the present invention is to have an electric storage device for a certain period of time, to constantly record a reproduction signal for a certain period of time from the present time, and to reproduce the signal again. When the same reproduction signal is required, by stopping the recording medium and immediately reproducing it from the electrical storage device, it is possible to omit the mechanical reverse movement of the recording medium, and the time required for repeated reproduction can be extremely reduced. The purpose is to shorten the time, reduce unreasonable operation of the mechanism, and improve the life and reliability of the mechanism.

<Preferred Embodiment of the Invention> When studying a language using a tape recorder, especially practicing hearing, if a part comes up that you do not understand, you can listen to that part by playing it over and over again. Repeat once you understand and move on to the next step.

The same is true when converting a conversation recorded on a tape recorder into a written document; parts that could not be fully heard are played back repeatedly and continued writing.

In a case like the example above, you will have to rewind the tape, but this operation is quite difficult if you are not used to it, and you may end up rewinding the tape incorrectly, or you may not be able to rewind it enough and have to rewind it again. It's quite a tedious operation, and even if you get used to it, it's nerve-wracking work.

The speed of the rewinding operation varies depending on the amount of winding on the reel, and it takes a considerable amount of time to get used to it, and repeating playback and rewinding places excessive force on the mechanism. Therefore, the reliability of the feeding mechanism section is reduced. To make matters worse, when I want to listen to a conversation or story that I want to hear right away, I have to stop playback, start rewinding, and then stop. Only when you press the playback start button will you hear the desired part, but as mentioned earlier, if you cannot rewind it enough or not enough, you will have to repeat the same operation again. I have to feed it.

In order to solve the above-mentioned problems, the present invention constantly stores the reproduced signal for a predetermined number of seconds in the past from the time of reproduction in an electric storage device such as an IC memory, and as soon as the reproduction stops, the previous conversation It is a device that plays back a story or story from an electrical storage device, allowing the same part to be played instantly over and over again.

As shown in the above example, the present invention is very effective when applied to a tape recorder for conversation practice or a tape recorder for dictation, so in this embodiment, the case where it is applied to a tape recorder will be described.

FIG. 1 shows a block diagram when the present invention is applied to a tape recorder.

<Overview> In FIG. 1, when the playback start button 101 is pressed, the running control device 103 sends a playback start signal to the tape running mechanism 104, and the playback head attached to the tape running mechanism 104 reads the tape signal. Regenerate the waveform and switch 106
After that, this signal is amplified by an amplifier 107, and a reproduced sound is emitted from a speaker 108. At the same time, a waveform storage start signal is sent to the waveform storage device 105, and the signal waveforms being reproduced by the reproduction head are sequentially stored by the reproduction head.
Also, signal waveforms from a certain period of time ago are sequentially erased. As a result, the waveform storage device 105 constantly stores signal waveforms from that point up to a certain period of time.

Next, when the playback stop button 102 is pressed, the running control device 103 sends a playback stop signal to the tape running mechanism 104 to stop running the tape, and at the same time sends a signal to the waveform storage device 105 to play back the stored waveform. Send a start signal. Waveform storage device 105
receives this signal and continues until playback is stopped.
The memorized waveform is traced backwards to find a break in the conversation or speech, and from that point on, the memorized waveform is played back, passed through the changeover switch 16, amplified by the amplifier 107, and emitted the sound from the speaker 108. do. The general operation has been explained above with reference to FIG. 1, but the details will be described below.

<Detailed Example> FIG. 2 shows details of the waveform storage device 105 shown in FIG. 1. First, the operation of the waveform storage device during playback by a tape recorder will be described.

A waveform signal reproduced by the reproduction head of the tape transport mechanism 104 shown in FIG. 1 is supplied to the input terminal 201, sampled and quantized by the A/D converter 202, and converted into a digital signal. The converted digital signal is supplied to a silent section detection section 203 and an information compression section 204. The information compression section 204 converts the digital waveform signal into
Information is compressed in real time using the ADPCM method or the like, and the compressed waveform signal is supplied to the storage section 208 via the input changeover switch 205.
The storage unit 208 includes an address counter 207 that performs counting under the control of the address control unit 206.
The compressed waveform signals are sequentially written to the addresses specified by . A/D converter 202, information compression section 2
04, the storage unit 208 operates in synchronization with the sampling pulse of the A/D converter 202.

On the other hand, the silent section detection unit 203 calculates the amplitude or power of the signal waveform, and determines that it is a silent section when the value becomes smaller than a certain threshold and this state continues for a certain period of time or more. When the start of a silent section is detected, a control signal is sent to the address control unit 206 and the address counter 207 of the storage unit 208 is
interrupts the count, and also switches the input selector switch 2.
05 to switch the connection between the information compression section 204 and the storage section 208 to the connection between the silent section detection section 203 and the storage section 208. By the above control, writing of compressed information to the storage unit 208 is interrupted during the silent period.

Next, when the end of the silent section is detected, the silent section detection section 203 generates a special symbol indicating the appearance of the silent section, adds the duration of the silent section to it, and writes it into the storage section 208. After finishing writing the special symbol and duration, switch the input switch 205 again between the information compression section 204 and the storage section 20.
8, and sends a control signal to start address counting to the address control unit 206 to start writing compressed information.

Here, a method for storing compressed information in the storage unit 208 will be described. FIG. 3 shows a storage system of the storage section 208, which includes a storage circuit 301, a read address counter 302, and a write address counter 303. Memory circuit 301
The memory addresses of are numbered from 0 to N, and the read address counter 302,
When the write address counter 303 counts up to N, the next address becomes 0, forming a cyclic storage system. In FIG. 3, address n 304 is the address indicated by the current write address counter 303, and address _S1 305, address _S2 306, and address _S3 307 are the special symbol of the silent section and the continuation of the silent section, respectively. This is the address where time is written, and compressed waveform signal information is written at other addresses.

As mentioned above, when playing back a tape recorder,
As shown in FIG. 3, the special signal of the silent section and the compressed waveform signal information are sequentially stored at the address where the information from one cycle before is stored, using an appropriate cyclic storage method. That is, the information one cycle before the storage address is erased and new information is stored. As a result, the latest information for one round of memory addresses is stored.

Next, a description will be given of the operation when stopping reproduction and repeatedly reproducing the immediately preceding waveform information.

When the playback stop switch 102 in FIG. 1 is pressed, the address control unit 206 in FIG. 2 moves the read address counter 302 in FIG. The contents of the address are read out while counting down from the address, and this operation is continued until the special symbol indicating a silent section appears twice. Third
In the illustrated example, the countdown is made to the silent section 306 of _S2 , and reproduction of the waveform signal is started from that address. Of course, in the case of countdown, the value N follows the value 0 in order to realize a cyclic storage system. When reproduction from the storage circuit 301 is started, the read address counter 302 is counted up and the contents of the storage circuit are sequentially read out. The read contents are supplied to the silent section clock section 210 and the information restoration section 209.

When the information read from the storage unit 208 is a special symbol of a silent interval, the silent interval clock unit 210 detects this and captures the duration of the silent interval accompanying the special symbol. At the same time, the output selector switch 211
is connected to the silent interval clock section 210, and a zero signal is supplied to the D/A converter 212 via the output changeover switch 211 for the duration of the silent interval. When this operation is completed, the output changeover switch 211 is switched to the information restoration section 209 again. Information restoration unit 209
restores the compressed waveform information read from the storage unit 208, converts it to the original waveform information, and supplies it to the D/A converter 212 via the output switch 211. The D/A converter 212 converts the digital signal into an analog signal and outputs it to the outside from an output terminal 213.

The above-described repeated reproduction operation is continued until the value of the read address counter 302 matches the value of the write address counter 303. In addition, in the down-counting operation to find a silent section, if the contents of the read address counter 302 reach the next address of the write address counter 303 before two silent sections are found, playback starts from that address. Start. On the other hand, if the playback stop switch 102 is pressed again during the setting of the repeat playback operation, the repeat playback operation starts from the down-count operation to find a silent section again from that address.

The embodiments of the present invention have been described above in a case where they are applied to a tape recorder, but if the memory element becomes cheaper and smaller, it can be applied to equipment such as a VTR.

<Effects of the present invention> As described above, the present invention provides an apparatus for reproducing signals from a recording medium that runs using a mechanical mechanism.
It has an electrical storage device for a certain period of time, in which it constantly records the playback signal for a certain period of time from the present time,
When the same reproduction signal is required again, it is immediately reproduced from the electrical storage device as soon as the recording medium stops running, which eliminates the need to mechanically reverse the recording medium and reduces the time required for repeated reproduction. Extremely shortened, reducing unreasonable movement of the mechanism,
A useful signal reproducing device with improved longevity and reliability of the mechanism can be provided.

Also, when storing the reproduced signal in an electrical storage device, when the signal becomes small enough to be compared to the noise level, it is possible to save the storage area of the electrical storage device by excluding that part and storing it. Not only does it have the advantage of being easy to use, but it is also more convenient to store a special symbol in the removal section and use this special symbol to cue the beginning, allowing more convenient control of playback.

[Brief explanation of drawings]

FIG. 1 is an overall block diagram showing one embodiment of the present invention, FIG. 2 is a block diagram showing details of the waveform storage device in FIG. 1, and FIG. 3 explains the storage method in the storage section in FIG. 2. FIG. 102... Playback stop button, 103... Travel control device, 104... Tape traveling mechanism, 105...
Waveform storage device, 107...Amplifier, 108...Speaker, 203...Silent interval detection unit, 204...
Information compression section, 206...Address control section, 207
... Address counter, 208 ... Storage section, 2
09... Information restoration unit, 301... Memory circuit, 30
2... Read address counter, 303...
Address counter for writing.

Claims (1)

[Scope of Claims] 1. In a signal reproducing device that magnetically, electrically, or optically reproduces a signal from a recording medium running by a mechanical mechanism, when reproducing a signal from the recording medium, the signal is always and means for repeatedly reproducing the reproduction signal from the recording medium within the limited time from the electric storage device. , When the signal reproduced from the recording medium is stored in the electrical storage device, if the signal becomes small to a level comparable to the noise level,
That part is removed and a special symbol and a silent continuous memory code are stored in its place, and when a signal that is small enough to be compared to the noise level is reproduced from the electrical storage device, it is indicated by the silent special memory code. A signal reproducing device characterized by comprising means for not outputting for a certain amount of time.