JPH01294276A - Player for cd audio/rom disk - Google Patents

Abstract

PURPOSE:To surely discriminate a disk type by detecting the presence or the absence of a sink signal recorded on a CD.ROM disk to discriminate an audio CD disk or the CD.ROM disk. CONSTITUTION:A detecting means 3 which detects the presence or the absence of the sink signal recorded on the CD.ROM disk and a discriminating means 8 which discriminates a disk 1 set to a player for CD audio/ROM disk as the audio CD disk or the CD.ROM disk based on the detection result of the detecting means 3 are provided. It is detected whether the sink signal is recorded on the disk or not, and the disk is discriminated as the CD.ROM disk when it is recorded, but the disk is discriminated as the audio CD disk when it is not recorded. Thus, the disk type is surely discriminated.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" This invention relates to audio CD discs and CD-R discs.
The present invention relates to a CD audio/ROM dual-purpose player that can play any OM disc.

"Prior Art" Conventionally, CD players include audio CD players and CD-ROM players.

FIG. 3 is a block diagram showing the configuration of a conventional audio CD player. In this figure, l is a compact disc (CD), 2 is a spindle motor that rotates the compact disc l, 3 is an optical pickup that reads digital information recorded by pits on the signal recording surface of the compact disc 1, and 4 is this A feed motor for moving the optical pickup 3, 5 is the optical pickup 3
an RF amplifier that amplifies the read signal output from the 6
is a constant linear velocity control (CL) of the spindle motor 2 under the control of a microcomputer 8 to be described later.
V servo), focus adjustment control (focus servo) and tracking adjustment control (tracking servo) of the optical pickup 3. This servo circuit 6 has focus servo gain and tracking control according to commands from the microcomputer 8. An automatic adjustment function is provided to adjust the servo gain to the optimal value. 7 is RF
A signal processing circuit performs processing such as demodulating the signal amplified by the amplifier 5 and correcting and correcting code errors; 9 is a DA converter that converts the digital signal output from the signal processing circuit 7 into an analog audio signal; is an audio circuit that amplifies this audio signal, and the output signal of this audio circuit 10 is outputted to an external speaker or the like via an audio output terminal 11. 12 is LED,
A display device such as a liquid crystal display 13 is an operation section including a play button for instructing the start of the playback operation, a stop button for instructing the stop, and a numeric keypad for instructing the song number. The microcomputer 8 is composed of a CPU (central processing unit), a ROM in which programs used by the CPU are stored, a RAM for data recording, and an I10 (input/output) port. This microcomputer 8 outputs a control signal to the servo circuit 6 based on the track information output from the signal processing circuit 7 and the song number (self-position 11) input from the operation section 13, and also outputs a control signal to the operation section 13. The song number input from 13 and the TOC (T
available of contents) information on the display 12
Further, if the signal processing circuit 7 has not completely corrected and corrected the code error, an audio mute signal is output to the audio circuit IO.

Next, FIG. 4 is a block diagram showing the configuration of a conventional CD-ROM player. In this figure, 14 indicates the error correction capability 10-' of the audio CD player by
Error correction circuit for CD-ROM to improve
15 is a host computer interface for matching the microcomputer 8 with an external host computer.

``Problems to be solved by the invention'' By the way, recently, audio CD discs, CD-R
C that can play OM discs on the same player
A dual-purpose D-Audio/ROM player has been developed.

In such an audio/ROM player, it is necessary to determine whether the disc set in a predetermined mounting section is an audio CD disc or a CD-ROM disc. Conventionally, the disc type has been determined by detecting a subcode recorded on the disc. However, this discrimination based on the subcode has a problem in that the disc type cannot be stably discriminated.

This invention was made in view of the above-mentioned circumstances, and it is possible to reliably determine whether an audio CD disc is an audio CD disc or a CD/ROM disc and to ensure stable playback.
The purpose is to provide an OM player.

"Means for Solving the Problem" This invention provides an audio CD disk and a CD-R.
A CD audio/ROM dual-purpose player into which an OM disc is loaded includes a detection means for detecting the presence or absence of a sync signal recorded on the CD-ROM disc, and a detecting means for detecting the presence or absence of a sync signal recorded on the CD-ROM disc; The present invention is characterized by comprising a discriminating means for discriminating whether the loaded disc is an audio CD disc or a CD-ROM disc.

"Operation" According to the present invention, it is detected whether or not a sync signal is recorded on the disc. If any information is recorded, the disk is determined to be a CD-ROM disk, and if no information is recorded, the disk is determined to be an audio CD disk.

"Embodiment" Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a CD audio/ROM dual-purpose player according to an embodiment of the present invention. In this figure, parts corresponding to those in FIGS. 3 and 4 are given the same reference numerals, and their explanations will be omitted.

The player shown in FIG. 1 includes a CD-ROM error correction circuit 14 and a host computer interface 1 at the output terminal of the signal processing circuit 7 of the audio CD player shown in FIG.
5 and an output terminal 16 are connected.

Next, FIG. 2 is a diagram showing the data structure of a CD-ROM disc, and (1) is a diagram showing the structure of data blocks.

In this figure, block [B1] is a sync (synchronization) signal composed of 12 bytes, which synchronizes servo circuits and the like. FIG. 2(b) shows details of this sync signal. Block [B21 is a header consisting of 4 bytes, and a specific address is written therein. Block [B11 is a user data area composed of 2048 bytes, and is an area that can be used by the user. Block [B4] is an auxiliary data area composed of 288 bytes, in which data for data error detection is recorded.

In this manner, a 12-byte sync signal is recorded at the beginning of a CD-ROM disc. On the other hand, audio CD discs do not have a sync signal and instead record audio data. In other words, if the sync signal at the beginning of the data block is detected, the audio CD disc or CD-ROM is detected.
It becomes possible to determine whether it is a disc or not. Therefore, in this embodiment, it is determined whether the disc currently set in the loading section is a CD-ROM disc or an audio CD disc, based on whether or not there is a sync signal at the beginning of the data block. ing. The process of this discrimination will be explained in detail below.

First, when a CD-ROM disk is set in the loading section, the feed motor 4 is driven under the control of the microcomputer 8, and the optical pickup 3 is moved to the leading position of the data. Then, when the spindle motor 2 reaches a predetermined rotation speed, the optical pickup 3
The signal of the block [B1] shown in FIG. 1 is read.

This signal is input to the microcomputer 8 via the RF amplifier 5 and the signal processing circuit 7. The microcomputer 8 converts this signal into a sync signal (Fig. 2(b)) stored in the internal memory.
), it is determined that it is a CD/ROM disc. Next, the microcomputer 8 displays the CD-ROM on the display 12.
Then, the operation unit 13 other than the EJECT button is disabled, and then an audio output signal is output to the audio circuit 10. Note that if this audio mute signal is not output, the data output from the signal processing circuit 7 will be converted into an analog signal by the DA converter, supplied to the speaker via the audio circuit 10, and produced as noise. The microcomputer 8 then communicates with the host computer via the host computer interface 15. From then on, CD-R
Data read from the OM disk is output to the host computer via the CD-ROM error correction circuit 14 and the host computer interface 15.

Next, when an audio CD disc is set as a disc in the mounting section, the signal at the beginning of the data is read by the optical pickup 3 in the same manner as described above. Then, the microcomputer 8 compares the sync signal with the sync signal shown in FIG. 2(b) and determines that they are not the same. Therefore, the microcomputer 8 does not communicate with the host computer via the host computer interface 17, turns off the audio mute signal to the audio circuit 10, and enables audio output.

Note that if it is necessary to reproduce an audio signal during reproduction of a CD-ROM disc, the audio mute signal is turned off.

"Effects of the Invention" As explained above, according to the present invention, the CD/ROM
Since it is determined whether the disc is an audio CD disc or a CD-ROM disc by detecting the presence or absence of a sync signal recorded on the disc, it is possible to reliably determine the disc type.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a data configuration diagram of a CD-ROM disk, FIG. 3 is a block diagram showing the configuration of a conventional audio CD player, and FIG. 4 is a block diagram showing the configuration of a conventional audio CD player. The figure is a block diagram showing the configuration of a conventional CD-ROM player. 1...CD, 3...Optical pickup (detection means), 8...Microcomputer (discrimination means).

Claims (1)

[Claims] In a CD audio/ROM dual-purpose player into which an audio CD disc and a CD/ROM disc are installed, a detection means for detecting the presence or absence of a sync signal recorded on the CD/ROM disc, and based on the detection result of the detection means, Is the disc installed in the CD audio/ROM player an audio CD disc or CD/R?
What is claimed is: 1. A CD audio/ROM dual-purpose player, characterized in that the CD audio/ROM dual-purpose player is equipped with a discriminating means for discriminating whether the disc is an OM disc.