JPH06275011A - Compact disk device - Google Patents

Abstract

PURPOSE:To display information by a simple liquid crystal display type device, to display and confirm the contents of a disk and to improve the additive value of a CD by displaying additive information employing only character codes. CONSTITUTION:Signals from a disk signal detection section 2 are waveform reformed by an analog waveform reforming section 3. These signals are synchronization detected by a synchronization detection section 4, processed in a digital signal processing section 5 and are inputted to a subcoding section 6. The tracking information is inputted into a tracking servo section 7 and controls the operations of an optical pickup. On the other hand, the contents of the subcoding are inputted to a character generation section 9 by the section 6, converted into prescribed characters or figures and outputted to a display section 10. In the section 10, the information added in a TOC area, such as the title of a music and others, is displayed. Thus, there exists no need for the use of subcodings R to W and a display device, such as a television set, is not required.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of using compact disc subcoding.

[0002]

2. Description of the Related Art Conventionally, a compact disc (hereinafter referred to as a CD) has a diameter of 120 mm and a center hole of 15 mm, and a music program can be recorded from an inner diameter of 50 mm to an outer diameter of 116 mm. It has become. There are zones called lead-in and lead-out immediately inside and outside the area in which the music program is recorded, and the CD player detects the contents of these zones and automatically plays. CD
Unlike tape, you can quickly find the beginning of a song and move the pickup to that position. What is useful for this purpose is recorded on the innermost circumference of the disc.
This is called OC (Table of Contents), and the CD player reads this content, and when a command to reproduce any movement comes, it is possible to quickly find the desired position and move the pickup. The block diagram of the above-mentioned TOC area starts with a block of frame synchronization, and the head of the area can be detected. One symbol composed of 8 bits is recorded in the sub-coding block. This sub-coding function has (1) a cue for a music piece and a program function for reproducing in accordance with a preset order. (2) It is possible to enjoy various ways such as a display that were not possible with conventional LPs. There are two types of blocks, P and Q, inside the sub-coding, and a control signal (time information) is mainly input to improve the operability of the disc, and six types of R to W include graphics, characters, voice synthesis, etc. It is designed to include information about. A display device such as a television or a liquid crystal panel is required to use the six types of subcodes R to W, and a signal converter for this is required on the player side. Therefore, in commercially available players, the coding of R to W is not used, and normally only two types of P to Q are used. The content of 72 bits of the data area has the structure shown in the block 62 in FIG. When the POINT of the block 63 is 00 to 99, it indicates the absolute time when each movement indicated by the numeral starts. 69 PMIN in the figure,
The PSEC 70 and the PFRAME 71 record the absolute time when the lead-out starts. The POIN
When the content of T is A0, the PMIN indicates the first movement number, and the values of PSEC and PFRAME are zero.
When POINTO is A1, PMIN indicates the last movement number, and the values of PSEC and PFRAME are zero. By reading the TOC area of the CD in this way, the information on the number of pieces of music recorded on the CD and the playing time can be known. Therefore, the CD drive reads the information of this TOC area first when the disc is inserted. The control is changed according to each data. In order to handle complicated information such as graphics, characters, and voice synthesis, it is possible to use 6 types of R to W of the sub-coding.
In order to use the six types of subcodes W to W, a display device such as a television or a liquid crystal panel must be connected to the CD player, and a signal converter for this purpose is also required on the player side.
Therefore, in the commercially available player, the coding of R to W is not used, and only two types of P to Q are usually used. For these reasons, the above TOC area is used in the conventional TOC area. Since only the internal information peculiar to the CD such as the number of songs and the playing time was written like this, for example, several consecutively-transmitted discs were mounted together,
In the case of reproducing, the conventional TOC area information has a problem that the contents of each disc (for example, the title of a song) cannot be confirmed.

[0003]

As described above, the conventional T
The OC information has a problem that it cannot be performed when it is desired to display information such as the title of a song title on the display, because only the internal information of the disc is written. SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and provide a device capable of reading out various information about the CD and displaying the information on a display.

[0004]

In order to solve the above-mentioned problems, the present invention puts additional information in the TOC area so that the title of the song and other information are written in addition to the playing time information of the song. , Read it out and display it on the display.

[0005]

With the above construction, the CD according to the present invention
In the effective use method of the TOC area, since the additional information is put in the TOC area, it is possible to know more information about the CD by reading the additional information.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the structure of a method of utilizing additional information (characters) by the TOC area of a CD according to the present invention will be described with reference to FIG. A block 1 is a spindle motor of the CD and a signal detector 2 of the disk.
This tracking information is subjected to waveform shaping by, the synchronization detection unit 4 detects the synchronization, the digital signal processing unit 5 processes it, and the tracking information is input to the sub-coding unit 6.
The light is input to control the operation of the pickup. The present invention inputs the content of sub-coding to the character generating section 9 from the sub-coding detecting section 6 in the block 11 of the digital portion which constitutes the conventional CD player, and converts it into a character code of a predetermined character or numeral. And output to the display unit 10. The display unit 10 displays the information added in the TOC area, for example, the title of the song, etc.

Next, the TOC area pointer according to the present invention will be described with reference to FIG. However, the data described below is expressed in hexadecimal. In the figure, for example, the first song is ABC and the second song is the song titled DEF is 1
When recorded for each minute, the content of the TOC area of the first song ABC has a structure as shown in block 21. At the top of the block, set POINT of block 13 to B
0 = number of characters, PMIN of block 18 is a variable number (01 to 99), and PSEC of block 19 is 0
0, and the PFRAM of the block 20 is set to the number of characters (03 in this case because it is 3 characters of ABC). Again 2
When POINT of the block 13 of the tier is B1 = character, it has the following meanings. Ie PMIN
= Movement number (01 to 99), PSEC = indicating what number character, PFRAM = indicating character (here, 41 of hexadecimal number corresponding to each of the alphabet A, B, C, ... Z of the character) , 42, 43, ..., 5A correspond to 41 in this case because it is A). Similarly, 42 is recorded in the third row of the block 20 and 43 is recorded in the fourth row. If the above Q code is read and displayed on a simple liquid crystal panel capable of displaying characters, the title will be displayed according to the music.

[0008]

As described above, C according to the present invention
According to the method of effectively using the TOC area of D, the additional information can be displayed only by the Q code, and it is not necessary to use the subcoding R to W, so that a large-scale display device such as a television is not required. It can be displayed with a liquid crystal display device equipped in a conventional CD player. For example, in the case of a player that processes playback of a disc of several consecutive transmissions, only the time information of the conventional TOC is used to display the disc. Although it was impossible to determine the contents, the present invention makes it possible to display and confirm the contents of the disc, which is convenient for use and has the effect of increasing the added value of the CD.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a method of effectively using a TOC area of a CD according to the present invention.

FIG. 2 is an explanatory diagram of a method of effectively using a TOC area of a CD according to the present invention.

FIG. 3 is a configuration diagram of a conventional TOC area.

[Explanation of symbols]

1 CD spindle motor and disk signal detection block 2 Signal detection unit 3 Analog waveform shaping unit 4 Sync detection unit 5 Signal processing unit 6 Sub coding unit 7 Tracking servo unit 8 Rotation servo unit 9 Character generation unit 10 Display unit 11 Digital part

Claims (1)

[Claims] 1. A digital portion for inputting a signal from a compact disc of a CD player, performing synchronization detection, processing a digital signal, and outputting the digital signal to a D / A converter portion, which is stored in a TOC area of the compact disc. A compact disc device comprising: a sub-coding detection unit for detecting additional information data, a character generation unit for reading the additional information data and converting it into a character, and a display unit for displaying this character.