JPH0955036A - Method for storing voice data of cd-rom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to record information at a high density by making common use of the min. reproduction unit data of a min. unit and the voice data for sentence reproduction including a plurality of such data. SOLUTION: Analog voice data groups are read into a recording medium having a high memory capacity and sequential files are formed in order of reproducing these voice data groups. Next, the voice data groups for sentence reproduction are read out and are compressed by using a compression program. The compressed voice data groups are again segmented by every min. reproduction unit. The reproduction start address and reproduction end address of the voice data for word reproduction are then extracted. A file to store the respective addresses, for example, as1, al1 is formed. The file storing the voice data and the file storing the respective addresses are recorded on the CD-ROM, by which the recording of the information at the high density is made possible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for efficiently storing compressed audio data in a file on a CD-ROM. In particular, the present invention relates to a technique for storing voice data that is effective when reproducing both voice data in a minimum reproduction unit such as a word and voice data for reproducing a sentence such as a sentence including a plurality of voice data in a minimum reproduction unit. .

[0002]

BACKGROUND OF THE INVENTION In recent years, there has been an increasing demand for audiovisual teaching materials in which not only voice but also characters and images are added to teaching materials for language education such as English. Therefore, as a teaching material, a read-only memory (ROM), for example, a CD-ROM in which other digital information data such as computer code data and image data is recorded together with voice data is used instead of a conventional English word book or the like. Is starting to appear.

In this CD-ROM, each data of audio data and image data is spiraled from a central portion to a peripheral portion on a disc-shaped disk based on, for example, the standards of Yellow Book, ISO9660 and CD-ROM / XA. Recording is performed by forming pits along a track running in the direction (CLV: a method of rotating at a constant linear velocity).

Here, voice data is targeted among such various types of data. The audio data is recorded in a file on the CD-ROM as compressed audio compressed by a method such as ADPCM (adaptive differential pulse code modulation) in order to increase the storage efficiency. 1 / n of audio data to be recorded
(Where n is a positive integer greater than 1, for example 2,
4, 8, 16), n channels are secured in one file on the CD-ROM.

Conventionally, such compressed voice data is converted into C
As a method of arranging the files in the D-ROM, a method according to the reproduction order of audio data has been adopted. On the other hand, a method of more efficiently arranging voice data is
It was previously proposed in JP-A-6-295539. This method is a method of arranging audio data in order of increasing length, and preferentially arranging each audio data to be arranged in a channel having a larger remaining area of each channel.

By the way, for example, a CD-R for language learning
The OM requires at least two types of search and reproduction for reproducing individual words that form a sentence and for continuously reproducing the words as a sentence. Therefore, conventionally, as shown in FIG. 6, two types of audio data, that is, audio data for sentence reproduction and audio data for word reproduction for reproducing a word which is a minimum reproduction unit, are recorded on a CD.
-It was stored in a file on ROM. That is, since the voice data for reproducing sentences is a set of voice data for reproducing words, two same voice data are stored.

[0007]

Therefore, even if the audio data shown in FIG. 6 is interleaved according to the flow chart shown in FIG. 3 using the method described in Japanese Patent Laid-Open No. 6-295539, which has a high storage efficiency, CD-ROM
The free area of the above audio data file remains very small as shown in FIG. Therefore, the total amount of information of the audio data that can be recorded on the CD-ROM is limited, and the file characteristics on the CD-ROM having a large storage capacity have not been effectively utilized. CD-R
Since visual data such as image data and character data is recorded in the OM in addition to the voice data, the file area for the voice data on the CD-ROM is under pressure. From this point as well, the amount of information that can be stored as voice data is limited. In particular, for language learning and the like, visual data is indispensable data like voice data, but recording visual data requires a larger file area than voice data. That puts more pressure on the file area of the audio data.

Further, in order to increase the density of information to be recorded in a file on a CD-ROM in the future, there is a demand for a technique in which the same information need not be recorded in duplicate. For that purpose, it is desirable to use the audio data to be reproduced for each individual minimum reproduction unit data and the audio data to reproduce a plurality thereof. For example, it is desirable to use voice data for word reproduction and voice data for sentence reproduction.

Therefore, the present invention provides a technique of using, as a file on a CD-ROM, voice data of a minimum reproduction unit and voice data for reproducing a sentence including a plurality of the voice data.

[0010]

That is, according to the present invention, the following requirements A, B and C are satisfied in order to use the minimum reproduction unit data and the text reproduction data including a plurality of the minimum reproduction unit data. The present invention relates to a method of storing satisfying voice data in a file on a CD-ROM.

A. Storing the text reproduction data as one data. B. In the case where the sentence reproduction data is composed of arbitrary x pieces (where x is a positive integer of 1 or more) of minimum reproduction unit data, each minimum reproduction unit data is
It has a playback start address at the beginning and a playback end address at the end, and is arranged from the 1st to the xth in the playback order. C. The reproduction start address of the first minimum reproduction unit data is the reproduction start address of the text reproduction data,
The reproduction end address of the x-th minimum reproduction unit data is
It must be the playback end address of the text playback data.

According to the above invention, since the amount of audio data recorded in the file is halved, the file area of the audio data can be reduced. Also, other information can be recorded in the empty area of the audio data file. As a result, a CD-ROM having a high recording density can be provided.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, the minimum reproduction unit data is the smallest division of data to be reproduced, and examples thereof include words and phrases. The text reproduction data is a large section of the data to be reproduced, and includes a plurality of the minimum reproduction unit data. Examples of the sentence reproduction data include phrases such as lyrics in addition to sentences. More specifically, there are various types of voice data, and for example, English conversation can be cited. In this case, each sentence forming an English conversation can be used as sentence reproduction data, and individual words forming the sentence can be set as minimum reproduction unit data.

Since the text reproduction data contains a plurality of minimum reproduction unit data inside, the difference in the data length easily occurs due to the difference in the number of the minimum reproduction unit data contained inside. Therefore, when storing such audio data, the above-mentioned applicant himself proposed the Japanese Patent Laid-Open No.
It is preferable to use the technology described in Japanese Patent No. 295539, because the utilization efficiency of each channel can be further increased.

As described above, when the minimum reproduction unit data and the text reproduction data including a plurality of the minimum reproduction unit data are recorded in the file on the CD-ROM so that they can be reproduced, the data amount can be reduced to 1 by using the method of the present invention. It can be set to / 2.
Therefore, other information can be further recorded in the free area of the file, which is generated due to the decrease in the amount of data. For example, in the case of a language teaching material, in addition to English, it becomes possible to record multilingual such as Japanese, German, and French corresponding thereto. Also, since the file area itself for audio data can be made smaller,
Other file areas such as image data and character data can be enlarged accordingly.

[0016]

EXAMPLES The present invention will be further described below with reference to examples. However, this embodiment does not limit the embodiment of the present invention thereto. In this embodiment, English conversation is adopted as voice data, one sentence thereof is used as sentence reproduction data, and words constituting the sentence are used as minimum reproduction unit data. FIG. 1 is a schematic flowchart showing an example of processing of audio data according to the present invention. The analog audio data is processed into digital audio data, and a CD-R is used.
The flow of processing until recording in OM is shown. Less than,
An embodiment of a method for storing audio data in a file on a CD-ROM will be described with reference to FIG.

First, as shown in FIG. 1, the audio data is recorded in advance on a magnetic tape (MT) or a floppy disk (FD) as an analog audio data group.
Next, this analog audio data group is read into a recording medium having a large memory capacity such as a hard disk <first processing step (a)>. Then, a sequential file is created in the order of reproducing the audio data group read in the first processing step (a) <second processing step (b)>.

The voice data group for sentence reproduction, which is continuously reproduced, is read from the sequential file created in the second processing step (b) and compressed using a compression program <third processing step (c) >. At this time, an analysis / synthesis method, a waveform coding method, or the like can be used as a method for compressing the audio data, but compression using the waveform coding method by ADPCM is required as compared with other compression methods. This is preferable because the number of bits can be reduced.

Then, in parallel with the compression process of the voice data group for sentence reproduction which is continuously reproduced from the sequential file in the third processing step (c), a description file for managing the reproduction order of the voice data group is created. <Fourth processing step (d)>.

The compressed audio data group is divided into the minimum reproduction units as shown in FIG. 2 <fifth processing step (e)>. As means for dividing this voice data group,
For example, there is a method of artificially classifying each of the minimum reproduction units while listening to the reproduced audio data group.

When the sentence reproduction voice data divided into the minimum reproduction units as the word reproduction voice data are interleaved in accordance with the flowchart shown in FIG. 3, the result becomes as shown in FIG. 4 <Sixth processing Process (f)
>.

On the other hand, the reproduction start address and reproduction end address of the audio data for word reproduction divided into the minimum reproduction units are extracted <seventh processing step (g)>, and the extracted respective addresses are stored. Create a file to
Eighth processing step (h)>. At this time, the reproduction start address and the reproduction end address of the voice data for sentence reproduction constituted by the voice data for word reproduction divided for each minimum reproduction unit are also extracted and stored at the same time.

Finally, FIG. 5 shows a file F ₁ storing the interleaved voice data shown in FIG. 4 and a file F ₂ storing each address generated in the eighth processing step (h). To record on CD-ROM <
Ninth processing step (i)>. CD files F ₁ and F ₂
-As a device for recording on ROM, a commercially available CD-RO
It can be performed using an M premastering device.

By adopting such a storage method, the CD
-The free area of the memory in the file on the ROM becomes large. This can be easily understood by comparing FIG. 4 according to the storing method of the present invention with FIG. 7 which is a conventional example, because the vacant area of the hatched memory is larger in FIG. Therefore, other information can be further recorded in the empty area, and the CD-R in which information is recorded at high density
OM can be manufactured.

When it is necessary to modify the compressed audio data recorded on the CD-ROM after that, the compressed audio data is returned to the original state, the data is processed and modified, and the compression processing is performed again. It was troublesome. However, the compressed voice is a collection of 128-byte blocks called a sound group. Therefore, if the sound group is used as the minimum unit and the data is modified (for example, added, deleted, corrected, or replaced), the compressed voice is compressed. It can be processed as it is. Further, the audio data processed in this way does not generate noise or distortion during reproduction. Therefore, this compressed audio data processing method is excellent in accuracy and processability.

When reproducing the CD-ROM in which the audio data is recorded by the above method, the reproduction start address and the reproduction end address of the audio data to be reproduced in the file F ₂ are searched. Next, the desired word reproducing data or sentence reproducing data is retrieved from the file F ₁ by using those addresses and reproduced.

For example, assume that the reproduction start address and the reproduction end address are as ₁ and ae ₂ , respectively, as a result of searching the file F ₂ for the target audio data. Next, the file F ₁ is searched by relying on this address, and the word reproduction data “1234” is reproduced. On the other hand, the reproduction address and the reproduction end address are as ₁
And ae ₃ , the text reproduction data “123
45689012345689012 ”is reproduced.

[0028]

According to the present invention, in the CD-ROM, the minimum reproduction unit data which is the minimum unit to be reproduced,
Since the sentence reproduction data including a plurality of these are also used, the amount of audio data that can be stored in the CD-ROM can be halved compared to the conventional case. Therefore, even if the file area for audio data is small, information can be recorded sufficiently. Further, since other information can be recorded in the empty area, the files on the CD-ROM can be effectively used. That is, in the future, a CD-ROM in which information is recorded at high density can be manufactured.

[Brief description of drawings]

FIG. 1 is a flowchart showing an embodiment of processing of voice data according to the present invention.

FIG. 2 is an example of audio data processed on a CD-ROM according to the present invention.

FIG. 3 is a flow chart diagram for arranging audio data in order of their size.

FIG. 4 is an arrangement example in which the audio data shown in FIG. 2 is interleaved in a file in order of size.

FIG. 5 is a conceptual diagram when audio data of the present invention is recorded on a CD-ROM.

FIG. 6 is an example of audio data conventionally stored in a CD-ROM.

7 is an arrangement example in which the audio data shown in FIG. 6 is interleaved in a file in order of size.

[Explanation of symbols]

File containing F ₁ audio data File containing address information for starting and ending playback of F ₂ audio data

Claims (4)

[Claims] 1. A method of storing audio data in a file on a CD-ROM so that the minimum reproduction unit data or text reproduction data including a plurality of the minimum reproduction unit data can be appropriately selected and reproduced. By compressing the audio data to 1 / n (where n is a positive integer larger than 1) and satisfying the following requirements A, B and C, the minimum reproduction unit data CD-characterized by being used also as text reproduction data
Storage method of voice data in ROM. A. Storing the text reproduction data as one data. B. In the case where the sentence reproduction data is composed of arbitrary x pieces (where x is a positive integer of 1 or more) of minimum reproduction unit data, each minimum reproduction unit data is
It has a playback start address at the beginning and a playback end address at the end, and is arranged from the 1st to the xth in the playback order. C. The reproduction start address of the first minimum reproduction unit data is the reproduction start address of the text reproduction data,
The end address of the x-th minimum reproduction unit data must be the reproduction end address of the text reproduction data. 2. The text reproduction data is stored in order from the one with the longest data length, and each of the text reproduction data to be stored is preferentially stored in a channel having a larger remaining area of each channel. The storage method according to claim 1, wherein: 3. The sentence reproduction data having a data length size of 1 to n are written in order of data length size of 1 to n.
After sequentially arranging on each channel of, the data length is (n +
1) The sentence reproduction data after the 1st is arranged again on each channel of 1 to n, and the (n + m) th (where m is a positive integer larger than 1) sentence reproduction When arranging data, if there are multiple channels to be preferentially allocated, the channel with the smallest channel number among those plural channels is (n + m).
The storage method according to claim 2, wherein the second sentence reproduction data is arranged. 4. The storage method according to claim 1, wherein the CD-ROM includes a file for visual data different from audio data.