KR100239788B1 - The reproducing method for compressed audio data - Google Patents

Abstract

The present invention relates to a method for reproducing compressed audio data, and more particularly, to a method for reproducing compressed audio data compressed and recorded on a compact disc.

When only the audio data is compressed and recorded on the compact disc, and the audio data is continuously reproduced in the order as in the conventional method, a large amount of compressed audio data is continuously read and output from the compact disc. There was a problem that bottlenecks occur in the process of converting and outputting audibly and audibly, so that voice information cannot be reproduced efficiently.

According to the present invention, only the voice data is compressed and recorded on a compact disc, and when the corresponding voice data is reproduced, the bottleneck caused in the audio output process is eliminated, thereby efficiently reproducing the voice data, and the compression rate of the voice data compressed on the compact disc is reduced. Even if this fluctuation occurs, the voice data is efficiently reproduced.

Description

Compressed Locked Voice Data Playback Method

The present invention relates to a method for reproducing compressed sound data, and more particularly, to a method for reproducing compressed sound data compressed and efficiently recorded on a compact disc.

Recently, a technique for recording a large amount of information by compressing and recording audio data and video data onto a compact disc has been developed and used.

When the information compressed in the compact disc is reproduced as described above, the user uses the information by reading the compressed information from the compact disc, converting it into the original information form, and outputting the original information.

Conventionally, when audio and video data are compressed by compressing audio data and video data together using MPEG (Moving Pictuer Expert Group) method and playing back audio data and video data at the same time, audio data and video data can be guaranteed at the same time. And video data are alternately recorded on the compact disc by a predetermined amount, and the audio data and the video data are simultaneously provided to the user by sequentially playing the information of the compact disc in sequence.

However, when only the audio data is compressed and recorded on a compact disc and continuously reproduced in the same order as in the conventional method described above, a large amount of compressed audio data is continuously read and output from the compact disc. There is a problem in that the bottleneck occurs in the process of converting and outputting audibly audibly, so that voice information cannot be reproduced efficiently.

The present invention has been made in order to solve the above problems, and when only the voice data is compressed and recorded on a compact disc and the corresponding voice data is reproduced, the bottleneck phenomenon generated in the voice output process is removed to efficiently reproduce the voice data. The purpose is to make it work.

Another object of the present invention is to efficiently reproduce audio data even if the compression ratio of the audio data compressed and recorded on the compact disc is varied.

In order to achieve the above object, the present invention provides a method for reproducing a compressed audio data for reproducing voice data compressed and recorded on a compact disc, wherein a playback instruction command is issued by a user while the compact disc is loaded. A first step of reading reproduction time information and compressed voice data from the compact disc when applied; After the first step, the playback time information is stored and at the same time, the compressed voice data is processed, converted into voice data in a form capable of outputting audio, and stored in a memory for a predetermined unit amount. A second step of suspending the data reading operation; A third step of converting the voice data stored in the memory into an analog voice signal after the second step; If a predetermined amount of voice data remains in the memory because most of the voice data of the memory is converted into an analog voice signal while the third process is performed, the following voice data is based on the stored playback time information. And a fourth step of repeating the operation of the second step by reading the reproduction time information from the compact disc.

The present invention configured as described above compresses and records only voice data on a compact disc, and when reproducing the voice data, eliminates the bottleneck caused in the voice output process, thereby efficiently reproducing the voice data. In addition, even when the compression ratio of the audio data compressed and recorded on the compact disc is changed, the audio data can be efficiently reproduced.

1 is a block diagram of an audio data reproducing apparatus according to the present invention.

FIG. 2 is a flowchart showing a voice data reproduction process of the voice data reproducing apparatus shown in FIG.

* Explanation of symbols for main parts of the drawings

2: Disc drive motor 3: Pickup drive motor

4 amplification unit 5 optical pickup

6 amplification unit 7 digital signal processing unit

8: memory part 9: memory part

10: first decoder 11: second decoder

12: switch part 13 D / A conversion part

14: first control unit 15: keypad

16 liquid crystal display 17 second control unit

18: memory

As shown in FIG. 1, the audio data reproducing apparatus according to the present invention includes a disc drive motor 2, a pickup drive motor 3, an amplifier 4, an optical pickup 5, an amplifier 6, and a digital device. Signal processing unit 7, memory unit 8, memory unit 9, first decoder 10, second decoder 11, switch unit 12, D / A converter 13, first control unit 14, the keypad 15, the liquid crystal display unit 16, the second control unit 17 and the memory unit 18 are provided. The keypad 15 inputs various commands for controlling the reproducing operation to the first control unit 14, and the liquid crystal display unit 16 displays the reproducing situation visually under the control of the first control unit 14. . The first control unit 14 controls the operation of the disc drive motor 2 and the pickup drive motor 3. The digital control unit 14 reads the audio data compressed and recorded on the compact disc 1. 7) The play time information applied from the second drive unit 17 is stored, and when the pause command instructing to stop the read operation from the second control unit 17 is applied, the operation of the disc drive motor 2 and the pickup drive motor 3 is stopped. Stops reading audio data of the compact disc 1 and stops, and when a read command is applied from the second control unit 17 again, the disc drive motor can read out the next part of the audio data based on the stored reproduction time information. (2) and the pickup drive motor (3) are operated. The digital signal processing unit 7 receives the reproduction time information and the audio data applied through the amplifier 6 from the optical pickup 5, outputs the reproduction time information to the first control unit 14, and outputs the audio data to the CD. It converts the data into a ROM format and outputs it to the first decoder 10 and the switch unit 12, and transmits a control signal applied from the first controller 14 to the amplifier 4 side. The amplifier 4 amplifies a control signal applied from the first controller 14 through the digital signal processor 7 and outputs the signal to the disk drive motor 2 and the pickup drive motor 3. The disc drive motor 2 is driven in accordance with a control signal applied from the amplifier 4 to rotate the compact disc 1, and the pickup drive motor 3 is optically driven in accordance with a control signal applied from the amplifier 4. The pickup 5 is driven. On the other hand, the optical pickup 5 is driven by the pickup driving motor 3, by radiating light to the compact disc 1 to convert the light reflected from the compact disc 1 applied to an electrical signal (compact disc ( The reproduction time information and audio data are read out from 1) and output to the digital signal processing section 7 via the amplifying section 6. The first decoder 10 decodes the audio data of the CD-ROM format applied from the digital signal processor 7, converts the audio data of the MPEG format into the MPEG data, stores the data in the memory unit 8, and then stores the audio data in the second decoder 11 side. Output The second decoder 11 decodes the audio data of the MPEG format applied from the first decoder 10, converts the voice data into general voice data, stores them in order in the memory unit 9, and outputs them to the switch unit 12. The second controller 17 reports the output state of the voice data stored in the memory 9 to the second controller 17 side. The switch unit 12 selects and outputs one of the voice data directly applied from the digital signal processor 7 and the voice data applied from the second decoder 11 under the control of the first controller 14, and is compressed. In the case of reproducing the recorded audio data, the audio data applied from the second decoder 11 is output to the D / A converting section 13, and in the case of reproducing the non-compressed audio data recorded in the digital image, the digital data is reproduced. The audio data directly applied from the signal processor 7 is output to the D / A converter 13 side. In addition, the D / A converter 13 converts the voice data applied from the switch unit 12 into an analog signal and outputs it to the voice output unit (not shown). The second controller 17 outputs a command corresponding to the voice data output state of the memory unit 9 to the first controller 14, from the first decoder 10 to the second decoder 11. When the voice data is input as much as the storage amount of the memory unit 9 when is inputted, a pause command instructing to stop reading of the voice data is output to the first control unit 14, and the voice data of the memory unit 9 is If it is reported that the voice data output is to be completed from the second decoder 11 just before all of them are output, a read instruction command for instructing to read the voice data is output to the first controller 14 side. On the other hand, the memory unit 18 connected to the second control unit 17 stores the recording sector information of the entire compact disc 1 when the compact disc 1 is loaded.

The audio data reproducing apparatus according to the present invention made as described above performs operations in the order shown in Fig. 2 when reproducing the voice data compressed in the compact disc 1.

First, when a playback instruction command is applied to the first control unit 14 by the user via the keypad 15 while the compact disc 1 is loaded (step 20), the first control unit 14 is the digital signal processing unit. (7) and the amplifying section (4) outputs a control signal to the disc drive motor (2) and the pickup drive motor (3) side, drive the compact disc (1) by the disc drive motor (2) to optical pickup (5), the reproduction time information and the audio data of the compact disc 1 are read out and output to the digital signal processing unit 7 side through the amplifying unit 6 (step 21). At this time, the digital signal processing unit 7 outputs the reproduction time information to the first control unit 14 and converts the audio data into a CD-ROM format and outputs the audio data to the first decoder 10. The control unit 14 reads out the reproduction time information applied from the digital signal processing unit 7 and stores it in its own memory (step 22). On the other hand, the audio data of the CD-ROM format applied to the first decoder 10 is decoded by the first decoder 10 to be converted into the audio data of the MPEG format and output to the second decoder 11 (step 23). In this case, the second controller 17 may issue a pause command for instructing to stop reading of the voice data when the voice data of the MPEG format is input to the second decoder 11 as much as the storage amount of the memory unit 9. Output to side 14). When the pause command is input from the second control unit 17 to the first control unit 14 in this manner (step 24). The first control unit 14 controls the disc drive motor 2 and the optical pickup 5 to stop the audio data reading of the compact disc 1 (step 25). Subsequently, the second decoder 11 decodes the voice data of the corresponding MPEG format applied from the first decoder 10, converts the voice data into general voice data, stores the same in the memory unit 9, and sequentially switches the switch unit 12. And output to the voice output unit through the D / A converter 13, and the second decoder 11 outputs the voice data output state of the memory unit 9 while outputting the voice data stored in the memory unit 9. When the second control unit 17 reports to the second controller 17, most of the voice data of the memory unit 9 is output and only a predetermined amount of voice data is stored in the memory unit 9, the second decoder 11 outputs the voice data. Report to the second control unit 17 that the output will be completed, where the second control unit 17 outputs a read command command to the first control unit 14 instructing to read the audio data from the compact disc 1. do. Accordingly, when a read command is inputted to the first control unit 14 (step 26), the first control unit 14 stores the next play time information and audio data based on the play time information stored in its memory. The disk drive motor 2 and the optical pickup 5 are controlled and operated so as to read out from 1) (step 27). After the operation of step 27 is performed, the flow returns to step 22 to repeatedly perform the same operation as described above. On the other hand, the reproduction time information read out when reading the audio data from the compact disc 1 is used when reading the following audio data, which indicates the recording position of the audio data in which the reproduction time information is recorded on the compact disc 1; This is because it is used as information to be shown.

In the case where the audio data compressed and recorded on the compact disc 1 is continuously reproduced continuously, a large amount of compressed audio data is read out from the compact disc 1 and the digital signal processor 7, the first decoder 10, and the like. It is applied to the voice output unit through the second decoder 11, and it takes a relatively long time to output a large amount of voice data in order through the voice output unit, so that a bottleneck phenomenon is caused when a large amount of voice data is continuously applied. . In the present invention, as described above, after storing a predetermined amount of voice data in the memory unit 9 connected to the second decoder unit 11, the compressed voice is again compressed from the compact disc 1 at the time when the voice data is output. By reading and outputting data, the bottleneck in the voice output process can be eliminated and the voice data can be reproduced efficiently. In addition, even when the compression ratio of the audio data compressed and recorded on the compact disc 1 changes, the audio data is reproduced and output as described above, so that the audio data can be efficiently reproduced.

As described above, the present invention compresses and records only voice data on a compact disc, and when reproducing the voice data, eliminates the bottleneck caused in the voice output process, thereby efficiently reproducing the voice data, and compressing and recording the compact disc. Even if the compression rate of the voice data is changed, the voice data can be reproduced efficiently. Therefore, the present invention can be usefully applied to a case of reproducing an audio book in which book contents are recorded by voice on a compact disc.

Claims (1)

A compressed sound data reproducing method for reproducing voice data compressed and recorded on a compact disc, comprising: playing time information from the compact disc when a playback instruction command is applied by a user while the compact disc is loaded; A first step of reading out the compressed voice data; After the first step, the playback time information is stored and at the same time, the compressed voice data is processed, converted into voice data in a form capable of outputting audio, and stored in a memory for a predetermined unit amount. A second step of suspending the data reading operation; A third step of converting the voice data stored in the memory into an analog voice signal after the second step; If a predetermined amount of voice data remains in the memory because most of the voice data of the memory is converted into an analog voice signal while the third process is performed, the following voice data is based on the stored playback time information. And a fourth step of reading out the play time information from the compact disc and repeating the operation of the second step.