JPH0214464A - Repeat reproduction device - Google Patents

Abstract

PURPOSE:To attain repeat reproduction for a prescribed time momentarily by varying a reproduction pointer at recording, deciding an address starting the readout at repeat reproduction, reading out and outputting a signal from a memory area designated by the reproduction pointer sequentially. CONSTITUTION:An acoustic signal obtained by the reproduction during the reproduction of an acoustic reproducer main body 1 is inputted to a repeat reproducer 6. That is, a reproduction pointer and a write pointer are recorded to a register 10 while being changed in response to the recording to an IC memory 9. At the command of repeat reproduction function, based on the reproduction pointer, the reproduction start address is decided and reproduction is applied till the readout address reaches the final address at write. Thus, when the acoustic data is occupied in the memory 9, repeat reproduction for a prescribed time is implemented momentarily without requiring mechanical operation of running control or the like of a magnetic tape.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention stores the second half of the audio signal reproduced from the main body of the audio reproduction device, and stores the audio signal stored in the repeat reproduction mode. This invention relates to a repeat playback device that outputs.

[Prior Art] Conventionally, when a user uses an audio reproduction device such as a tape recorder using magnetic tape, there are many cases where the user wants to immediately listen back to the audio signal that has been reproduced. Such demands are particularly strong in language learning and the like. In order to meet this demand, a sound reproduction device having a repeat reproduction device has already been proposed. This is so that when repeat playback is instructed via a repeat request switch, the magnetic tape is rewound for a short period of time and then played back from that point. However, since this repeat playback device requires rewinding time, it is not instantaneous enough and is difficult for users to use.

Therefore, a repeat playback device has already been proposed that uses a semiconductor memory (IC memory) to realize a repeat playback function without requiring a rewinding operation of the magnetic tape.

A repeat playback device using this IC memory simultaneously converts the acoustic signal played from the magnetic tape and generated from the speaker device from analog to digital and sequentially records it in the IC memory, and when a repeat request occurs, this IC
The acoustic signals recorded from the first address of the memory to the last recorded address are sequentially read out, digital/analog converted, and generated from the speaker device to realize a repeat playback function.

[Problems to be Solved by the Invention] However, according to the above-described repeat playback device, the repeat playback time differs each time a repeat playback request occurs, making it difficult to use. In particular, when the capacity of the IC memory is increased, the problem of greater variation in time becomes more serious.

Therefore, there are some IC memories that use first-in-first-out memory and set the number of stages according to a predetermined time to enable repeat playback for a certain period of time, but in this case, access control to the memory is The disadvantage was that the configuration was complicated.

The present invention has been made in consideration of the above points,
It is an object of the present invention to provide a repeat playback device with a simple configuration that can keep the repeat playback time constant when realizing a repeat playback function using an IC memory.

[Means for Solving the Problems] In order to solve the problems, the present invention includes a first signal processing means for analog/digital conversion of an acoustic signal reproduced from the main body of the sound reproduction device; playback pointer setting means for cyclically storing the acoustic data converted by the processing means in the semiconductor memory and setting a start address for reading out the acoustic data from the semiconductor memory during repeat playback; and playback pointer storage means for saving the start address. and a repeat playback instruction means for instructing repeat playback, and when repeat playback is instructed,
a reproduction instruction processing means for reading a reproduction pointer from a reproduction pointer storage means and sequentially reading and outputting acoustic data from each memory area from a memory area of a semiconductor memory designated by the read reproduction pointer to a memory area immediately before the memory area; a second signal processing means for digital/analog converting the acoustic data read out by the reproduction instruction processing means to produce a reproduced acoustic signal; and a speaker device for selecting the acoustic signal from the second signal processing means during repeat reproduction. and acoustic signal switching means for providing the same.

[Function] During the reproduction operation of the audio reproduction device main body, the acoustic signal obtained by reproduction is simultaneously input to the repeat reproduction device.

The input acoustic signal is converted from analog to digital by the first signal conversion means, and sequentially written and stored in the semiconductor memory by the playback pointer setting means. At this time, when the memory is full, the data is overwritten and saved again starting from the first address of the memory.

In parallel with this storage operation, the playback pointer setting means determines the address at which reading starts during repeat playback every time audio data is given, and stores the address in the playback pointer storage means as a playback pointer. This operation is performed while the main body of the sound reproducing device is reproducing.

In the state in which the audio signal is saved after the reproduction of the main body of the audio reproduction device is stopped, the repeat reproduction instruction means Kararit-I
- When playback is instructed, the playback instruction processing means reads the playback pointer from the playback pointer storage means, sequentially reads and outputs audio data from the memory area of the semiconductor memory specified by the read playback pointer, and outputs the sound data. Digital/analog conversion is performed via processing means. This reproduced acoustic signal is generated by being applied to the speaker device via the acoustic signal switching means during repeat reproduction.

As a result, since the playback pointer is changed during recording, a predetermined playback time can be secured. Furthermore, since the semiconductor memory does not have a first-in-first-out configuration, the configuration can be simplified.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. The sound reproduction device main body 1 is, for example, an audio cassette tape recorder, and plays when the playback switch 2 is pressed and outputs the reproduced sound signal to the speaker device 4 via the signal switching device 3, and also stops the sound signal. switch 5
This is applied to the repeat playback device 6 only until the button is pressed.

The acoustic signal S1 input to the repeat playback device 6 is first given to the signal processing section 7. The signal processing unit 7 converts the input audio signal into digital audio data D1 through analog/digital conversion and outputs it to the playback pointer setting unit 8. This setting section 8 is constituted by a counter, etc., and counts the number of input data D1, and outputs it to the memory 9 as write data D2. The setting unit 8 also sets a playback pointer which is a read start address, and outputs it to the register 10 as data D3. The register 10 stores this playback pointer and outputs data D4 to the playback instruction processing section 11 in response to a read command C1 from the playback instruction processing section 11.

In this embodiment, the memory has a capacity capable of storing several tens (for example, 30) seconds of acoustic data.

On the other hand, a reproduction command C2 is input to this reproduction instruction processing section 11 from a repeat reproduction command switch 12. Based on this input playback command C2, playback instruction processing section 1
1 outputs a command C3 to the signal processing unit 7, and also outputs a read command, a read address, etc. to the memory 9 using a command C4. With this command C4,
The memory 9 outputs the stored acoustic data to the reproduction instruction processing section 11 as data D5. The reproduction instruction processing unit 11 sends the input memory data D5 to the signal processing unit 7 as data D.
Output as 6.

This signal processing section 7 converts the input data D6 into digital/
The analog audio signal S2 is reproduced by analog conversion and output to the signal switching device 3. This signal switching device 3 switches the audio signal S1 from the audio reproduction device main body 1 and this audio signal S2, and outputs it to the speaker device 4 as a reproduction signal S4.

In the above configuration, when the normal reproduction mode of the acoustic signal is instructed by the reproduction switch 2, the audio reproduction apparatus main body 1 sequentially reproduces the acoustic signal S1 from the built-in magnetic tape and provides it to the repeat reproduction apparatus 6. At this time,
The signal processing unit 7 of the repeat playback device 6 samples the input audio signal S1 at regular intervals, converts it into digital audio data D1, and outputs it to the playback/interference setting unit 8.

This setting section 8 is configured to execute a playback pointer setting process and a recording process to the memory 9 shown in the flowchart of FIG.

The processing will be explained below.

First, the playback pointer setting section 11 sets the playback pointer SS.
, the write pointer WP and the parameter F are initialized to 0 (step 5PI).

Here, the playback pointer SS indicates the readout start address of the digital audio data written in the memory 9 during repeat playback, and the write pointer WP indicates the write address to the memory 9. Also, the parameter F is the memory 9
Indicates whether the number of data written to has overflowed.

Next, the playback pointer setting section 8 determines whether or not the audio data D1 from the signal processing section 7 has been input (step 5P2). When the data is input and a positive determination is obtained, the setting unit 8 subsequently determines whether the parameter F is O (step 5P3). If a negative judgment is obtained that the parameter F is 0, the process moves to step SP7. In this process, the setting unit 8 converts the input data D1 into data D2 as it is.
is written to the address in the memory 9 indicated by the write pointer WP (step 5P7).

After that, the write pointer WP is incremented (step 5 ps), and then this write pointer WP is set to the maximum value of the number of data that can be written in the memory 9 (final address M
AX) Determine whether it has become larger than (Step 5)
P9). Obtaining a positive determination in this case means that writing of data to the final address of the memory 9 has been completed. Therefore, the setting unit 8 sets the write pointer WP to 0 to indicate the start address, and sets the parameter F to 1 (step 5210), and returns to the process of step SP2. If a negative determination is obtained in step SP9, the process returns to step SP2 and receives the next acoustic data D1 from the signal processing section 7 without changing the write pointer WP and parameter F.

Further, if it is determined in step SP3 that the parameter F is not 0, the playback pointer setting unit 8 sets the playback pointer S
Increment S (step 5P4). Next, it is determined whether or not this playback pointer SS has become larger than the final address MAX (step SP'5). If the determination is negative, the process moves to step SP7, and the input audio data D1 is continued in the memory 9. Write it down. On the other hand, if it is determined in this step SP5 that the playback pointer SS has exceeded the final address MAX, the setting section 8 sets the playback pointer SS to 0 to point to the first address of the memory 9 (step 5P6).

The playback pointer setting unit 8 repeats this series of processing only while the audio data D1 is being input; as a result,
The acoustic data D2 is written into the memory 9 in order from the first address, and when the memory 9 is full, the data D2 is overwritten again in order from the first address. Furthermore, the playback pointer SS always specifies the start address of the memory 9 until the memory 9 is filled with the audio data D2 to be written, and after the memory 9 is filled with the audio data D2, the audio data D2 to be overwritten. The address is changed so that it always specifies an address that is 1 larger than the write address of .

The playback pointer setting unit 8 constantly supplies the playback pointer SS to the register 10 as data D3 and the write pointer WP as data D4 for storage.

Note that one area determined by the address of the memory 9 stores one piece of digitized audio data D2.

Next, the repeat playback process of the audio signal by the repeat playback device 6 will be described in detail.

When the operator requires repeat playback, he operates the repeat playback command switch 12. The repeat playback command switch 12 outputs the fact that a repeat playback request has occurred to the playback instruction processing section 11 using a command C2. This reproduction instruction processing section 11 executes the processing shown in the reproduction processing flowchart of FIG.

First, in step 5P20, it is determined whether or not the playback command C2 from the repeat playback command switch 12 has been input. If the command C2 is input and a positive result is obtained, the playback pointer RP from the physical start position of the memory 9 is determined. Initialize to O (step SP21)
). Note that this second playback pointer RP is used when playing back from the middle of the memory 9, as will be described later. After that, the processing unit 11 reads out the playback pointer SS (D3) stored in the register 10 (step 5).
P22>. Next, it is determined whether the read playback pointer SS points to the starting address of the memory 9 (step 5p23>. That is, whether to read data from the starting address of the memory 9 or from the middle of the memory 9). Decide whether to read.

As a result, the playback pointer S is placed at an address in the middle of memory 9.
If S is compatible, the memory address indicated by the playback pointer SS is given to the memory 9 by the command C4, and the audio data D5 stored at that memory address is sold (Step 5P24>.Furthermore, the read audio data D5
is given to the signal processing unit 7 as data D6, and is converted into digital/analog conversion into an analog acoustic signal S2 (
Step 5P25).

Thereafter, the processing unit 11 determines whether or not the playback pointer SS has exceeded the final address MAX of the memory 9 (step 5P26>). If it has not exceeded the final address MAX, the processing unit 11 increments the playback pointer SS and performs the step 5P23 described above.
Step 5P27> returns to step 5 and reads the acoustic data D5 from the next memory area.

By performing such repeated processing, eventually
The reproduction pointer SS exceeds the final address MAX, and a positive result is obtained in step 5P26. In this case, the data D5 is read out from the memory 9 using the second playback pointer RP as a playback pointer, and the readout audio data D5 is given to the signal processing section 7 as data D6 for digital/analog conversion, thereby converting the data D5 into an analog audio signal. Convert to S2 (step 5P28.5P29>).

Thereafter, it is determined whether the reproduction pointer RP has the value of data D4 indicating the write end point stored in the register 10 (step 5P30). If they do not match, the playback pointer RP is incremented and the process returns to step 5P28, where the audio data D5 is read from the next area (step 5p31).

By repeating this process, eventually step 30
A positive result is obtained. In this case, reading from the memory 9 has completed a cycle and all the audio data stored in the memory 9 has been played back, so this playback process is ended and the process returns to step 5P20 to input the next repeat playback command. Waiting for.

On the other hand, as a result of the determination in step 5P23 described above, if it is determined that data is to be read from the first address of the memory 9, the memory address indicated by the playback pointer SS is given to the memory 9 by the command C4, and the data is stored at that memory address. The read acoustic data D5 is given to the signal processing unit 7 as data D6 for digital/analog conversion and converted into an analog acoustic signal S2 (steps 5P32 and 5P33).

Thereafter, it is determined whether the reproduction pointer SS matches the value D4 of the write pointer WP stored in the register 10 (step 5P34). That is, it is determined whether the last acoustic data D5 written in the memory 9 has been read out. If the last acoustic data has not been read out,
The reproduction pointer SS is incremented and the process returns to step 5P32 described above to proceed to the process of reading audio data from the next area (step 5P35). By repeating such processing, the last written audio data is reproduced, and an affirmative result is obtained as a result of the determination in step 5P34.

In this case, since the reproduction of all the audio data has been completed, the process returns to step 5P20 and waits for the next press of the repeat reproduction command switch 12.

During this series of processing, the signal processing unit 7
The audio data D6 read out from the memory 9 through the audio signal converter 1 is sequentially digital/analog converted and outputted to the signal switching device 3 as an analog audio signal S2. This signal switching device 3 is configured to normally select the playback signal S3 from the audio playback device main body 1, and when the playback signal S2 is input from the repeat playback device 6, the playback signal is switched only for that period. It operates to select S2, and gives the selected reproduction signal S4 to the speaker device 4 to make it emit a sound.

In the case of this embodiment, since a memory having a capacity of about several tens of seconds is used, when storing acoustic data in the memory 9, it is possible that the acoustic data will not be input to the extent that the memory 9 is full. In consideration of such cases, the storage and playback processing of the playback pointer is made different depending on whether the memory 9 is full of audio data or not, as described above.

Therefore, according to the above embodiment, the playback pointer and the write pointer are stored in the register 10 while being changed according to the recording operation to the IC memory 9, and the playback start address is determined based on the playback pointer when the repeat playback function is instructed. Since the read address is determined and the playback is continued until the read address reaches the final address at the time of writing, when the memory 9 is full of audio data, the repeat playback for a certain period of time can be controlled by controlling the running of the magnetic tape, etc. This can be done instantly without requiring any mechanical action.

Note that the playback pointer SS may be advanced by an arbitrary number from the write pointer WP so that the playback time can be freely set.

Further, the audio reproducing apparatus main body 1 may be of any type as long as it has a slow operation for finding a reproducing point, and various apparatuses such as an audio cassette cheap recorder or a digital audio tape recorder can be used.

[Effects of the Invention] As described above, according to the present invention, it is possible to obtain a simple repeat playback device that can instantaneously perform repeat playback for a certain period of time.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a repeat playback device according to the present invention, FIG. 2 is a flowchart showing its recording process, and FIG. 3 is a flowchart showing its playback process. DESCRIPTION OF SYMBOLS 1... Sound reproduction device main body, 6... Repeat playback device, 7... Signal processing part, 8... Playback pointer setting part,
9...Memory, 10...Register, 11...Reproduction instruction processing unit.

Claims (1)

[Claims] Analog/
A first signal processing means for digital conversion, cyclically storing the acoustic data converted by the first signal processing means in a semiconductor memory, and setting a start address for reading the acoustic data from the semiconductor memory during repeat playback. playback pointer setting means for setting the start address as a playback pointer; playback pointer storage means for saving the start address as a playback pointer; repeat playback instruction means for instructing repeat playback; playback instruction processing means for sequentially reading and outputting audio data from each memory area from the memory area of the semiconductor memory specified by the read playback pointer to the immediately preceding memory area; a second signal processing means for digital/analog converting the acoustic data to produce a reproduced acoustic signal; and an acoustic signal switching means for selecting the acoustic signal from the second signal processing means and supplying the selected acoustic signal to the speaker device during repeat playback. A repeat playback device comprising: