KR0178729B1 - Disc format of a cd and its apparatus for reproducing - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc format and a playback apparatus for receiving information by reproducing various kinds of information (images, sounds, texts, etc.) stored on a CD without a computer. According to the present invention, still images and audio data are selectively recorded on a disc in units of pages, and a plurality of pages including a plurality of pages are provided, and an indexable area is provided for each chapter and each page. Then, the compressed still picture data and audio data are restored during recording on the disc having such an area arrangement so that the still picture can be displayed on the liquid crystal display or on the TV monitor through a jack connected to the TV. It can be transmitted through a TV speaker through a jack connected to the headphone or TV side.

Therefore, the present invention has the effect of providing a dedicated playback apparatus that is miniaturized to be portable, so that image and audio information recorded on a CD can be provided without a computer.

Description

CD disc format and playback equipment

1 is a diagram showing a disc format of a CD (CD) according to the present invention.

FIG. 2 is a view showing a file structure for explaining an environment in which the CD of FIG. 1 can be used.

3 is an external view of a CD (CD) reproducing apparatus having a disc format according to the present invention.

4 is a block diagram showing a CD (CD) playback apparatus according to a preferred embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

41: disc 42: pickup device

43: servo signal processor 44: high frequency amplifier

45: digital signal processing unit (DSP) 46: microcomputer

47,51,52: D / A Converter 48: Mixer

49: CD-ROM decoder section 50: information processing section

53: encoder portion 54: liquid crystal display portion

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc format of a compact disc (hereinafter referred to as a CD) and a playback apparatus thereof, and in particular, to reproduce and view a still picture recorded on a CD and an audio signal corresponding to the picture without using a computer. A disc format of a CD having a data recording structure defined on a disc, and a playback apparatus thereof.

In general, CD has advantages of high density, high capacity and fast access time. CD-DA (Digital Audio), CD-G (Graphic), CD-ROM (Read Only Memory), CD-I (Interactive), Video-CD, Photo -Widely used in fields such as CD. For example, a CD-ROM is a medium or device in which various data (images, sounds, texts, etc.) are pre-recorded on an optical disc of 12 cm in diameter developed for audio. In order to reproduce the information recorded on the CD-ROM, it is conventionally possible only through a computer equipped with a CD-ROM device. In other words, movies, cartoons, games, dictionaries, guides for tourist destinations, product catalogs, educational materials, etc. are recorded in a number of still images, and these are executed as computer software. Therefore, only those who have a computer with a CD-ROM device can receive various types of information recorded on the CD-ROM, and those who do not have a CD-ROM device or are unfamiliar with the computer, even if they have a computer. Difficulty in getting service. In addition, there are limitations depending on the place to receive information service because it is not portable. Of course, a dedicated CD player for audio reproduction is portable as well as stationary, but it can only listen to audio and cannot view images.

Accordingly, an object of the present invention is to solve the above-described problems and to provide a disk format in which an area is arranged so that images and audio information can be reproduced and viewed without a computer.

Another object of the present invention is to provide a reproducing apparatus capable of reproducing a CD having a data recording structure in accordance with the above-described disc format without limiting the location.

Disc format of a CD according to the present invention for achieving the above object is a volume description area in which data used for describing a disc is recorded in a CD medium, and the absolute starting position of each chapter is recorded in a table form. The page index area where the absolute starting position of each page is recorded for each chapter of the long index area, the application area according to the usage environment, and the chapter, the compressed still picture data and the compressed voice data as an option. And a page area in which the area is arranged in the circumferential direction from the inner circumference of the CD.

A CD playback apparatus according to the present invention for achieving another object of the present invention is a device for reproducing a still picture and audio information recorded on a CD, the error being detected and detected in the still picture and audio information picked up from the disc. A CD-ROM decoder for correcting and inputting the decoded data to the information processing section, an information processing section for expanding the compressed still picture and audio information at the time of recording, and outputting the expanded still picture and audio information; And two D / A converters for converting and outputting image and audio information into analog signals, respectively, and an encoder unit for converting and outputting a still image converted into analog signals into a composite video signal.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram showing a disc format of a CD according to the present invention, which is based on the CD-I BRIDGE disc format. In general, CD-I BRIDGE discs are a special type of CD-ROM XA disc with CD-I applications that can run in a CD-I player. In FIG. 1, in the region arrangement state of a disc whose left is the inner circumference of the disc and the right is the outer circumference, a volume descriptor program area in which data used to describe the disc is recorded is disposed on the inner circumference of the disc. A chapter is used as a concept to distinguish when a large number of contents are included in one disk after the volume description program area while going to the outer periphery of the disk. The chapter index that records the absolute starting position of each chapter in the form of a table (Chapter) Index) program area is arranged. Here, the long colored program region is always colored in a fixed position so that a CD-ROM disc having an area arrangement as shown in Fig. 1A can be accessed without relying on file structure. The program area must exist. Thus, in this embodiment, it is fixed to the position of 3 seconds as shown. After the long index program area, an application program suitable for each use environment is selectively selected so that a CD-ROM disc having an area arrangement as shown in FIG. 1 can be played not only in the playback device disclosed in the present invention but also in a computer, a CD-I player, and the like. The application program area is placed. Next to the application area are a number of chapters (Chapterl, ..., Chapter) containing a page index and data of pages. Here, the page index area contains the absolute starting position so that the position of each page can be known. Each page contains a compressed still picture and optionally compressed audio data as shown in FIG. The sound data is a sound corresponding to a still picture contained in each page, or an effect sound or background music. When a CD-ROM disk having such an area arrangement is to be executed in a computer basic system, it has a file structure as shown in FIG.

In FIG. 2, in the environment of CD-I, Windows, Macintosh, DOS, etc., the index index (CHAP.INX) of the disk is treated as one file, and each chapter is one file. It can be seen that it is treated as. The page index is located at the head of each boot file.

3 is an external view of a CD player according to the present invention. As shown, it has a portable structure and is equipped with two line output jacks to be connected to the liquid crystal display and the TV side. And, the headphone jack is mounted so that you can listen to the sound effects and audio while carrying. 4 is a block diagram of the CD player of the present invention having this appearance.

4 is a block diagram showing a CD player according to the present invention. As shown in the drawing, the apparatus of the present invention scans a laser beam in a corresponding area of the disk 41 rotating at a forward marching speed, and converts the reflected beam back into an electrical signal and outputs a high frequency signal. It is provided. In addition, the servo signal processing unit 43 that controls the servo operation of the pickup device 42 performs servo while interfacing information with the microcomputer 46. A high frequency amplifier 44 is connected to the output terminal of the pickup device 42, amplifies the high frequency signal reproduced from the disc by the pickup device to an appropriate level, and converts the amplified signal into the servo signal processing unit 43 and the digital signal processing unit ( Digital Signal Processors (hereinafter referred to as DSPs) respectively. A CD-ROM decoder 49 is connected to the output terminal of the DSP 45 to error-correct the still picture data and the compressed audio data compressed by the DSP, and output the error-corrected data to the information processing unit 50. . The microcomputer 46 is connected to the DSP 45, the CD-ROM decoder 49, and the like, and controls the DSP 45 and the CD-ROM decoder 49 while exchanging information with each other. The DSP 45 is also connected with a first D / A converter 47 for converting and outputting digital signal processed audio data into an analog signal. Two D / A converters 51 and 52 are connected to the information processing unit 50 for restoring the compressed still picture data and the compressed audio data which are error-corrected by the CD-ROM decoder 49 to the original data. The 2D / A converter 51 converts audio data into an analog signal and outputs it. The 3D / A converter 52 converts still image data into an analog signal and outputs it. A mixer 48 is connected between the first D / A converter 47 and the second D / A converter 51. The output terminal of the mixer 48 is connected to a jack connected to the headphone jack or the audio line terminal of the TV side. The encoder unit 53 which receives an analog converted image signal converts the image signal into a composite image signal form and outputs the converted image signal. The composite video signal is output through the jack connected to the TV-side video line terminal or output to the liquid crystal display unit 54.

In the CD reproducing apparatus of the present invention configured as described above, in the audio disc reproducing mode, the pickup device 42 controlled by the servo signal processing unit 43 scans a laser beam in a corresponding area of the disc 41 to disc 41 The beam reflected from the beam is converted into an electrical signal. The high frequency signal output from the pickup device 42 is amplified by the high frequency amplifier 44 and then applied to the DSP 45. The DSP 45 extracts and demodulates the EFM signal from the high frequency signal. The demodulated audio data is converted into an analog signal by the first D / A converter 47 and then output through a mixer 48 to a jack connected to the headphone or TV side audio line terminal.

In the disc playback mode in which still pictures and audio are recorded, data demodulated by the DSP 45 is input to the CD-ROM decoder 49. As shown in FIG. The CD-ROM decoder 49 detects and corrects an error in the demodulated data so that the decoded data is input to the information processor 50. FIG. The information processing unit 50 decompresses the compressed still picture data and the compressed audio data at the time of recording, and outputs the decompressed still picture data and the audio data. In this case, as a data compression method for recording, a moving picture expert group (MPEG), which is an international standard method for protecting moving picture data, or a joint photographic coding esperts group (JPEG), an international standard method for protecting still picture data, are generally used. The amount of data is compressed using the encoding technique presented in. In addition, a graphic compression method or an adaptive prediction coding (ADPCM) method may be used. The 2D / A converter 51 converts the extended audio data into an analog signal and outputs the audio signal to the headphone or TV side through the mixer 48. On the other hand, the 3D / A converter 52 converts the extended still picture data into an analog signal and outputs the converted signal to the encoder unit 53. The encoder unit 53 converts the still image signal converted into analog into a composite video signal type and outputs it to the video line terminal connected to the TV side or to the liquid crystal display unit 54 to output the image information to the TV monitor. Or image information through the liquid crystal display unit 54.

As described above, the present invention relates to a disc format of a CD and a playback device thereof, compared to the conventional method in which CDs containing information such as still images, sounds, and the like of cartoons can be played and executed by one of the computer application programs. By providing a dedicated playback device downsized to be portable, there is an effect that the information service can be received at any time without restriction.

Claims (7)

In CD media, volume description area where data used to describe a disc is recorded. Index area where the absolute starting position of each chapter is recorded in table form, application area according to usage environment, and chapter. A page index area in which the absolute starting position of each page is recorded for each chapter of the page, and a page area containing compressed still picture data and optionally compressed audio data. Characterized in that the disc format of the CD. The CD format according to claim 1, wherein the long index area of the CD is fixed at a predetermined time so that the CD can be accessed without reproducing the file structure. 2. The disc format of the CD according to claim 1, wherein the page index area of the CD is located at the beginning of each file because the long index area is treated as one file according to the use environment of the CD. An apparatus for reproducing a still picture and sound information recorded on a CD having a disc format according to any one of claims 1 to 3, wherein the error is detected and detected in the still picture and sound information picked up from the disc. A CD-ROM decoder for correcting and decoding the decoded data; An information processing unit which decompresses the compressed still picture and sound information at the time of recording and outputs the expanded still picture and sound information; Two D / A converters for converting the extended still image and voice information into analog signals and outputting the analog signals; And an encoder for converting and outputting a still image converted into the analog signal into a composite video signal. The CD player according to claim 4, wherein the encoder is connected to a liquid crystal display unit for displaying a composite video signal. The CD player according to claim 4, wherein the encoder is connected to a liquid crystal display unit for displaying a composite video signal. The CD player according to claim 4, wherein the D / A converter transmits the audio information converted into an analog signal through one of a jack, a headphone jack, and a built-in speaker connected to the TV side audio line terminal.