JPS62140274A - Data interface device for cd player - Google Patents

Abstract

PURPOSE:To use a DC player also as a readout memory driving part by adding the 1st and the 2nd attachments which include a modulator and a demodulator to the CD player and a computer and connecting the attachment to each other by a general-purpose connection cable. CONSTITUTION:The attachment consisting of a modulator 16a and a demodulator 16b is added to the CD player 1 and the attachment 20 consisting of a demodulator 20a, a modulator 20e, CD-ROM processing circuits 20b and 20d, and an interfaced 20c is added to the main body 21 of a host computer 2. The player 1 is normally connected to a stereophonic set and music, etc., are enjoyable by loading a compact disk 10 where music information, etc., are recorded. On the other hand, a disk 10 where data for the computer 2 is recorded is loaded and command signals of control instructions are supplied from the computer 2 to the player 1 to drive the disk 10 by the player 1, thereby supplying the recorded data to the computer 2.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a data interface device for a CD player that enables an interface between a general-purpose CD player and a computer.

(Technical background of the invention) General purpose 17) CD player (Compact Disc
Player) is a device that allows you to enjoy music by reading digital data such as music information recorded on compact discs developed for music, converting this digital data from DA to digital to analog, and sending it to a stereo set. It is something.

By the way, the above-mentioned compact disk has a storage capacity of about 500 to 100 times that of a small floppy disk used as a storage medium in general computers, and can be effectively used as a computer storage medium, that is, as a read-only memory. is possible. However, as mentioned above, general-purpose CD players were developed for the general public as a music player, and due to their structure, there are many difficulties in terms of interface when connecting to a computer, and the connection cable is usually a general-purpose cable. This is difficult to implement because it uses Therefore, it is desired that a general-purpose CD player can be interfaced with a computer as a read-only memory, and can also be used as a music CD player.

(Object of the Invention) An object of the present invention is to provide a data interface device for a CD player that can be used by connecting the CD player to a stereo set and can be used as a read-only memory drive section of a computer.

(Summary of the Invention) The present invention adds first and second attachments each including a modulator and a demodulator to a CD player and a computer that interfaces the CD player as a read-only memory. , the compact disc is used as a read-only memory for a computer by connecting the second attachment with a connecting cable.

(Embodiments of the Invention) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing a circuit block of a data input/Turface device of a CD player according to the present invention.

In the figure, 1 is a CD player (Compact Di
sc Player ), 2 is a host computer (computer), each of which has the following internal configuration. First, in the CD player 1,
10 is a compact disc (Compact Disc
CD), in which audio digital data is usually recorded as signal bits in a concave and convex manner, and is rotated by a motor 11 shown in the figure. Reference numeral 12 denotes a detection unit installed near the compact disc lO, which irradiates the compact disc with a condensed beam from a semiconductor laser from an internal optical head, and detects changes in the unevenness of the compact disc by changes in the intensity of reflected diffracted light. Then, it is further converted into an electrical signal and output. 13 is a CD processing circuit connected to the motor 11 and the detection section, which amplifies and shapes the electric signal output from the detection section 12, converts it into a pulse signal, and outputs it as digital data. Further, the CD processing circuit 13 detects errors in the obtained data, corrects the errors, and then rearranges the data into a predetermined data arrangement and sends it to the DA converter (digital-to-analog converter) 14. The DA converter 14 is connected to the CD processing circuit 13, converts the input data into an analog signal, removes frequency components outside the audible band using a low-pass filter, etc., and outputs the signal to the audio output terminal 15. 16 is a first attachment provided in a part of the CD player 1, and a modulator 16a (first modulator) converts the digital data output from the CD processing circuit 13 into a digital audio interface format. It is converted into a digital transmission format, and the status signal or data signal is output to the outside, that is, to the host computer 2 in FIG. Also, the demodulator 16
b (first demodulator) converts the command signal in the digital transmission format transmitted from the host computer 2 into digital data and outputs it to the CD control circuit 17. The CD control circuit 17 is a detection section 1 in the CD player l.
2 and the signal reproducing operation of the CD processing circuit 13, as well as the modulator 16 in the first attachment 16.
The signal conversion operation, etc. in a is controlled by, for example, a microcomputer (not shown).

On the other hand, in FIG. 1, the host computer 2 is provided with a second attachment 20 connected to its main body 21, and has a configuration that provides an interface between the main body 21 and the CD player 1. That is, in the second attachment 20, 20a is a demodulator (second demodulator), and this demodulator 20a receives the status signal output from the modulator 16a in the first attachment 16 in the CD player 1, or Demodulates the data signal, converts it to digital data, and outputs it. 20b is a CD-ROM processing circuit, and this CD-ROM processing circuit 20b converts the signal inputted from the demodulator 20a, that is, the scrambled data signal read out by the CD player 1, back to the original data. This circuit descrambles and performs secondary error correction on input signals as necessary. 20c is provided connected to this CD-ROM processing circuit 20b and the main body 21 of the host computer l, and
- An interface that converts the status and data processed by the ROM processing circuit 20b to match the data processing format of the main body 21. This interface 20c includes a CD-ROM control circuit 20.
d is connected, and command signals output from the main body 21, that is, signals such as control commands necessary for controlling the drive of the compact disc 10 in the CD player 1, are converted into digital data by the CD-ROM control circuit 20d. Convert and output.

20e is a modulator (second modulator), and the above CD-R
It is connected to the OM control circuit 20d, converts the command signal converted into digital data into a digital transmission format, and outputs it to the demodulator 16b (first demodulator) in the CD player 1.

The structural configuration of the data interface device for a CD player according to the present invention, which is constructed from the above blocks, will be explained. FIG. 2 is an external perspective view showing the overall appearance of a CD player including a stereo set and a host computer that are normally connected. In the figure, 1.2 is the first
The CD player and host computer (computer) 3 shown in the figure are a stereo set.

A CD player generally uses a compact disc 10 on which music information, etc. is recorded in the form of a digital signal.
is loaded, and by operating the operation buttons on the front panel 16, an audio signal is output from an output terminal (not shown in FIG. 1). Therefore, by connecting the connection cable 40 of the stereo set 3 to its output terminal, the music information recorded on the compact disc 10 is supplied from the stereo set 3, and the audio can be enjoyed as normal stereo.

The above-mentioned first attachment 16 and second attachment 20 are attached to a part of the CD player and a part of the host computer 2 having such a configuration, and these first and second attachments are connected by a connection cable 30.・Antiment 16 and 20 are connected. The above connection cable 30
Both ends are used for connecting between the stereo set 3 and the CD player 1, for example, an RCA pin plug 40a.
Pin plug similar to 30. a, 30b are added, and these pin plugs 30a, 30b are connected to the terminals (
(not shown) and a terminal 26 of the host computer 2, thereby connecting the first and second attachments 16, 20.

Next, the operation when the CD player data interface device of the present invention configured as described above is added to the CD player 1 and the host computer 2 will be described.

First, a CD player l equipped with a data interface device, that is, a CD player 1 to which the first attachment 16 shown in FIGS. 1 and 2 is attached, is normally connected to the stereo set 3 by a connecting cable 40. , as mentioned above, functions as a music CD player l. That is, the compact disc 10 storing music information etc. is loaded in a predetermined position, and the front panel 16
By operating the operation buttons on the top, you can enjoy music etc. as normal audio.

On the other hand, when used as a read-only memory for the host computer 2, the data interface device shown in FIGS.
Since the second attachment 20 shown in the figure is attached, by connecting this second attachment 20 and the first attachment 16 attached to the CD player 1 with the connection cable 30, the CD player 1 can be installed. Read-only memory (CD-R) of host computer 2
OM) Operates as a drive unit. That is, a compact disk 1 on which data for a host computer 2 is recorded.
0 is loaded into a predetermined position of the CD player 1, and a command signal of a control command is given to the CD player 1 from the host computer 2, so that the CD player 1 drives the compact disc 10, and the recorded data is transferred to the host computer. It is transferred to computer 2.

The operations of the host computer 2 and CD player 1 in this case will be explained below.

First, the main body 2 of the host computer 2 shown in FIG.
1 to the second attachment 20 interface 2
A command signal (for example, rRead command) for reading the recorded contents of the compact disc 10 is output to 0c. This command signal is further output to the CD-ROM control circuit 20d and converted into digital data. The converted command signal is converted into data in a digital transmission format by the modulator 20e, and is outputted to the demodulator 16b constituting the first attachment 16 inside the CD player 1 via the general-purpose connection cable 30. The demodulator 16b demodulates the sent command signal in the digital transmission format, that is, the control command signal for the CD player 1, and outputs it to the CD control circuit 17 as digital data. The CD control circuit 17 drives the motor 11 via the CD processing circuit 13 to rotate the compact disc 10 by an amount υ1 according to the contents of the input command signal from the host computer 2, and also drives the motor 11 to rotate the compact disc 10 by an amount υ1.
Control is performed to read out the recorded contents of the compact disc 10 which is rotating relative to the rotation speed of the compact disc 10. Data read out under these controls is input to the CD processing circuit 13. Then, the CD processing circuit 13 amplifies and shapes the signal input from the detection section 12, and outputs it as digital data to the modulator 16a. Here, in the CD processing circuit 13 described above, at the same time as signal processing, error detection and error correction of the signal obtained from the detection unit 12 are performed using, for example, CIRC (Cross In
terleave Reed Solomon Cod
This is done using an error correction code such as e). The digital data obtained in this way is transferred to the first attachment 16.
The modulator 16a converts the data into a digital transmission format, and sends it to the host computer 2 via the connection cable 30.

Here, if a data error or the like occurs during the operation of the CD processing circuit 13 described above, it is also possible to output the status inside the CD player 1 to the modulator 16a as a status signal (for example, rData ErrorJ, etc.). It is.

The data and status of the digital transmission format sent from the CD player 1 to the host computer 2 are as follows:
The signal is demodulated by the demodulator 20a of the second attachment 20, converted into digital data, and output to the CD-ROM processing circuit 20b.

This CD-ROM processing circuit 20b receives input data,
For the status signal, descrambling is performed to restore the scrambled data that was performed when the data was recorded, and secondary error correction is performed as necessary. The data or status thus obtained is output to the main body 21 of the host computer 2 via the interface 20c.

The main body 21 side takes in the data obtained as described above, or learns the operating state of the CD player 1 from a status signal, and outputs the next command in return.

Incidentally, in the above embodiments, the first and second attachments are provided inside the CD player 1 and the host computer 2, respectively, but as an option, they may be placed outside and connected to perform the above-mentioned functions. Of course, it is also good. Further, the host computer 2 may be, for example, a general-purpose personal computer, and the same effects as in the above embodiment can be obtained.

(Effects of the Invention) According to the present invention, first and second attachments including a modulator and a demodulator are respectively added to a general-purpose CD player and a computer, and a general-purpose connection is used between these first and second attachments. Since the connection is made using a cable, normally you can enjoy music by connecting the CD player to an audio device such as a stereo set, and you can also use the CD player as read-only memory by connecting it to a computer. A data interface device for a CD player can be provided.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a data interface device for a CD player according to an embodiment of the present invention, including circuit blocks of a CD player and a computer, and FIG. 2 is a block diagram showing a data interface device for a CD player and a computer shown in FIG. FIG. 3 is an external perspective view showing the configuration. L----CD player, 2-111 host computer (computer), 3-
111 stereo set, 10-m compact disc, 11-11 motor, 12-m detection unit, 13-1 CD processing circuit, 14--DA converter, 16--first attachment , 16a-one modulator (first modulator), 16b-one demodulator (first demodulator), 17-one-CD control circuit, 20-one second attachment, 20a-one demodulator ( 20b--CD-ROM processing circuit, 20cm-interface, 20d--CD-ROM control circuit, 20e--modulator (second modulator), 21-m-main body, 30-m-connection cable.

Claims (1)

[Claims] In a CD player that is connected to an audio device and plays music information recorded on a compact disc and outputs an audio signal to the audio device, the digital data that is added to the CD player and played back from the compact disc is modulated. a first modulator and the CD
a first attachment that includes a first demodulator that demodulates digital data for externally controlling the player; and a computer that is connected to the first attachment and that receives control data from the computer. a CD-ROM control circuit that is input via an interface and converts the control data into digital data;
A second modulator connected to the CD-ROM control circuit modulates and transmits the digital data, and a second modulator connected to the first modulator and demodulates the signal from the first modulator to generate digital data. a CD-R connected to the second demodulator, which descrambles or corrects data errors on the digital data and sends the data and status to the main unit via the interface;
a second attachment including an OM processing circuit, the first attachment and the second attachment are connected via a general-purpose connection cable, and the CD player is also used as a readout memory drive section of the computer. A data interface device for a CD player, characterized by: