JPS58188311A - Signal reproducer - Google Patents

Abstract

PURPOSE:To reduce the time required for the reproduction and to improve the life and reliabilty of a mechanism section, by storing the reproduced signals for a prescribed time from the present point of time and reproducing and outputting the stored signals immediately when the reproduction of the same signals is required. CONSTITUTION:When a reproduction start button 1 is depressed, a signal waveform on a tape is irradiated as a reproducing sound from a speaker 8 by means of a reproducing head and the signal waveform from the point of time before a prescribed time is stored in a waveform storage device 105. When a reproduction stop button 102 is depressed, a controller 103 for running stops the running of tape at a tape running mechanism and transmits a reproducing start signal to the storage device 105. The device 105 receives this signal and searches the waveform stored until the reproduction is stopped inversely, the interruption and missing of conversations and speakings are found out, the stored waveform from the point of time is reproduced and the sound is outputted from a speaker 108 via a changeover switch 106 and an amplifier 107.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for recording media that is run by a mechanical mechanism.
The present invention relates to a device that reproduces signals magnetically, electrically, and optically.

<Prior art> Conventionally, in a device that magnetically, electrically, or optically reproduces a signal from a recording medium that runs using a mechanical mechanism, if a human cannot recognize the reproduced signal, the previous signal is replayed. To play, the recording medium is first stopped, then run in the opposite direction for a certain amount of time, and then stopped.
By running the vehicle in the forward direction again, the previously reproduced signal can be repeatedly reproduced. However, this method requires mechanical operation, so it cannot be played quickly, and it is difficult to run the part in the opposite direction for the length of the part you want to play, so it may end up going too far or coming too far. Further, since it is necessary to travel in the opposite direction, it is mechanically strained, and if this is done frequently, it has disadvantages such as deteriorating the reliability and life of the equipment.

<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 playback 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, the mechanical reverse movement of the recording medium can be omitted, and the time required for repeated reproduction can be extremely reduced. Using a tape recorder, which reduces unreasonable movements of mechanical parts and improves the lifespan and reliability of mechanical parts, when studying a language, especially practicing listening skills, when you come across parts that you don't understand, , play and listen to that part over and over again, and when you understand that part, move on to the next one.

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 cases like the above example, 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 too much or not having enough rewind and have to rewind again. It's quite a troublesome operation, and even if you get used to it, it's a nerve-wracking job.

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.Also, repeating playback and rewinding places excessive force on the mechanism, so This reduces the reliability of the feed mechanism. Furthermore, to listen to the 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 play button to start playback can you hear the part you want, but as I mentioned earlier, if you rewind too much or
If rewinding is not enough, you will have to repeat the same operation again.

In order to solve the above-mentioned problems, in the present invention, the reproduced signal for a predetermined number of seconds in the past is continuously input to the IC from the reproduction point.
It is stored in an electrical storage device such as a memory, and as soon as playback is stopped, the previous conversation or story is played back from the electrical storage device, allowing the same part to be immediately played back any number of times.

As shown in the example in H below, the present invention is very effective when applied to a tape recorder for conversation practice and a tape recorder for 1-1 statements, so in this embodiment, the case where it is applied to a tape recorder will be explained. .

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 +03 sends a playback start signal to the tape running mechanism 104, and the playback head attached to the tape running mechanism +04 starts playing the tape. This signal is amplified by the amplifier 107 via the selector switch 106, and the reproduced sound is emitted from the speaker +08. At the same time, a waveform storage start signal is sent to the waveform storage device 105, and the signal waveforms reproduced by the playback head are sequentially stored, and the "reliable" 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 ago.

Next, when the playback stop button 102 is pressed, the running control device 103 sends a playback stop signal to the tape running mechanism +04 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. Start sending a message.

In response to this belief, the waveform storage device 105 emits the sound from the speaker 108 via the storage selector switch 106 and the amplifier 107 until the playback is stopped. The operation has been explained with reference to FIG. 1, and will be described in detail 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 reproducing head of the tape traveling mechanism 104 shown in FIG.
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 unit 204 converts the digital waveform signal using an ADPCM method or the like.
Information is compressed in real time, and the compressed waveform signal is supplied to the storage section 208 via the manual changeover switch 205. The storage unit 208 sequentially writes the compressed waveform signals to addresses specified by the address counter 207 while counting down under the control of the address control unit 206.

A/D converter 202, information compression section 204, storage section 208
operates in synchronization with the sampling pulse of the VD converter 202.

On the other hand, the silent section detection unit 203 calculates the amplitude or power of the signal waveform, and when the value becomes smaller than a certain threshold,
If this state continues for a certain period of time, it is determined that there is no sound. When the start of a silent section is detected, a control signal is sent to the address control section 206 to interrupt counting of the address counter 207 of the storage section 208, and a control signal is sent to the input selector switch 205 to start the information compression section 204. and the storage unit 208 are connected to the silent section detection unit 203 and the storage unit 2.
Switch to connection with 08. With 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 detecting section 2
From 03, a special note indicating the appearance of a silent section is generated,
The duration of the silent section is added thereto and written into the storage unit 208. After finishing writing this special symbol and duration, press the input selector switch 205 again to the information compression unit 20.
4 and the self-memory unit 208, and sends a control signal to start address counting to the address control unit 2061 to start writing compressed information.

Here, a method for storing compressed information in the storage unit 208 will be described. FIG. 3 shows the storage system of the storage section 208 (7), which includes a storage circuit 801, a read address counter 302, and a write address counter 303. The memory addresses of the memory circuit 301 are numbered (from O to N), or the read address counter 302 and the write address counter 303 count (well, N) and when the count advances, the next address is O. , forming a η-type memory system.
(In A, n address 304 is the address that indicates the current write address color/re 303, and address 51 and 30
Addresses 5, 82, 306, and 83, 307 each have a number C in which a special note for a silent section and the duration of the silent section are written, and compressed waveform information is written at other addresses.

As described above, when playing back a tape recorder, as shown in Figure 3, the special signal of the silent section and the compressed waveform signal information are stored in the cyclic storage system, so that the information from the previous round is stored. The data will be stored sequentially at the specified address. That is, the information one cycle before the storage address is erased and new information is stored. As a result, the latest information corresponding to the number of cycles corresponding to the storage address is stored.

Next (Operation when stopping B playback and repeatedly playing the previous waveform information will be explained.

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 interval appears twice. In the example of FIG. 3, the countdown is made to the silent section 306 of S2, and the 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.

Read j1 when playback from the storage circuit 301 is started]
The address counter 302 is counted up and the contents of the sequential storage circuit are read out. The read contents are
The signal is supplied to the silent section clock section 210 and the information restoration section 209.

If the information read from the storage unit 208 is a special symbol for a silent interval, the silent interval clock unit 210 detects this,
Captures the non-interval duration associated with the special note. At the same time, the output changeover switch 211 is connected to the silent interval clock section 210, and a zero signal is supplied to the VA 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. The information restoration unit 209 restores the compressed waveform information read out from the storage unit 208, converts it to the original waveform information, and outputs it via the output switch 211.
and supplies it to the A converter 212. D/, the converter 212 converts the digital signal into an analog signal and outputs it to the output terminal 213.
Be more visible to the outside world.

In the following repeated reproduction operation, the value of the read address counter 302 is changed to the value of the write address counter 303.
This continues until the values match. In addition, in the down-counting operation to find a silent section, the silent section is
If the contents of the read address counter 302 reach the next address of the write address counter 308 before looking at it, playback starts from that address. On the other hand, if the playback stop switch +02 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.

Although the case where the 1-1 embodiment of the present invention is applied to a tape recorder has been described above, if the memory element is inexpensive and small, it can be applied to equipment such as a VTR.

<Effects of the Present Invention> As described above, the present invention provides a device for reproducing signals from a recording medium that runs by a mechanical mechanism, which has an electric storage device for a certain period of time, and which continuously reproduces a certain period of time from the current point in time. It is possible to record a signal and, when the same reproduction signal is required again, immediately reproduce it from an electrical storage device as soon as the recording medium stops running, thereby omitting the mechanical reverse movement of the recording medium. Therefore, it is possible to provide a useful and reliable regeneration device that can extremely shorten the time required for repeated regeneration, reduce unreasonable operation of the mechanism, and improve the life and reliability of the mechanism.

In addition, when storing the reproduced signal in an electrical storage device,
When the signal becomes small enough to be compared to the noise level, removing that part and storing it has the advantage of making effective use of the storage area of the electrical storage device. It is more convenient to memorize a special mark and use this special mark to cue the beginning, as it allows you to control playback more precisely.

[Brief explanation of the drawing]

FIG. 14 is an overall block diagram showing one embodiment of the present invention;
The second factor is a block diagram showing details of the waveform storage device in FIG. 1, and FIG. 3 is a schematic block diagram for explaining the storage method in the storage section in FIG. 2. 102・Reproduction stop button, 1o3... Travel control device,
104... Tape running mechanism, 1o5... Waveform storage device, 107... Amplifier, 108... Speaker. 203... Silent section detection unit, 2o4... Information compression unit. 206 Address control unit, 207 Address counter, 208 Storage unit, 2o9 Information restoration unit. 301...Storage circuit, 3o2...Address columnar for reading, 803...Address counter for writing.

Claims (1)

[Claims] l A recording medium that runs by a mechanical mechanism is magnetic,
In a signal reproducing device that regenerates a signal electrically or optically, when reproducing a signal, means for always storing the reproduced signal within a certain limited time before the current time in an electrical storage device. and a stage for repeatedly reproducing signals within a limited period of time that have been previously recorded by the electrical storage device, immediately and without mechanical operation, if necessary. signal regenerator. 2. When storing a signal reproduced from a recording medium running by a mechanical mechanism in an electrical storage device, if the signal is reduced to a kill level compared to the noise level, the signal will be stored excluding that part. A signal reproducing device according to claim 1, characterized in that: 3. When a signal reproduced from a recording medium running by a mechanical mechanism is stored in an electrical storage device, if the signal becomes small enough to be compared with the noise level, that part is removed and the Instead, memorize special notes,
3. The signal reproducing apparatus according to claim 1, wherein the special symbol is used to locate the beginning of the borrowed signal when reproducing the signal.