JPH05342748A - Disc reproducer - Google Patents

Abstract

PURPOSE:To disclose the record contents of a disc in mounting of the disc. CONSTITUTION:In mounting of a disc, a reproduction command means 41 works to continue a reproduction operation still after a data of a TOC is reproduced with an optical pickup 1. At the same time, a counting means 45 is driven to count the amount of the data reproduced with the optical pickup 1. A management information detecting means 42 performs a detection to determine whether an image data exists in the data reproduced or not. Such an operation is continued until the management information detecting means 42 detects the existence of any image data or an output of the above counting means 45 attains a specified amount of data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for reproducing a disc on which images, music, character information, etc. are recorded.

[0002]

2. Description of the Related Art Among optical discs, compact discs for recording audio data have become widespread. CD graphic players, which record and reproduce image data and character data in addition to audio data on this disc, have become popular especially in karaoke. In addition, MIDI (Musi
A disc that records data according to a standard called cal instrument digital interface has also been developed. This is an image or MID in an area called a subcode.
I control data is recorded.

A subcode is control data recorded in each frame (588 bits for one frame) which is a recording unit of data on the disc. The subcode indicates whether the frame is at the start of a song or during a song, or its address information, and an image. The control data for identifying whether or not the data exists is described.
(Magazine "Electronics" published by Ohmsha, 1985, 1
CD-I (monthly issue, pages 97 to 104) closer to which image data (natural images, animations, computer graphics, etc.) and character data are recorded on this disc, and the operator interactively reproduces the recorded data. A compact disc interactive) player is expected to be put to practical use. CD-I players have also been developed that enable graphic display and MIDI data reproduction using these subcodes.

A player that reproduces an optical disk first sets a TOC (Table of con
Get the management information of the disk called tent). TO
In C, for example, in the case of the compact disc, the number of recorded songs, their start addresses and their playing times are described. When the operator specifies a music piece to be reproduced to the player, the player reproduces the specified music piece based on the address information recorded in the TOC.

The recorded contents of this TOC are almost the same even in the case of a disc on which image data is recorded in addition to audio data. Only the start address of the tune is recorded and the data recorded on the disc is audio. No information is recorded in the TOC to identify whether only the data or the image data of the subcode and the MIDI data are included. Whether or not the disc also records sub-code data must be confirmed by actually starting reproduction of each track and allowing image data and MIDI data to appear in the sub-code.

[0006]

Usually, a player for reproducing a disc displays the recorded contents of the disc when the TOC is acquired. The recorded contents are the number of songs on the disc, the playing time, and the like, as described above. Therefore, if only the TOC is acquired when the disc is mounted, even if the disc also recorded image data, it cannot be displayed at that time. The presence or absence of image data cannot be determined until the player operates the reproduction key and the player starts the reproduction operation.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a disc reproducing apparatus which discriminates the presence or absence of image data or MIDI data when a disc is mounted and displays information to that effect. ..

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, in the present invention, the above-mentioned T
After acquiring the OC information, when the output of the counting means is within a predetermined value, the drive of the disk reproducing operation of the reproducing means by the reproducing drive means is continued until the control data detecting means detects the specific control data. It is a feature of.

A second feature is that the disk drive operation of the reproducing means is continued to be driven by the reproducing drive means until the control data detecting means detects the specific control data when the output of the time measuring means is within a predetermined time. And A third feature is that the disk drive operation of the reproducing means by the reproducing drive means is continued to cause the control data detecting means to detect specific control data when the output of the counting means is within a predetermined value.

A fourth feature is that the disk drive operation of the reproducing means by the reproducing drive means is continued so that the control data detecting means detects the specific control data when the output of the time measuring means is within a predetermined time. ..

[0011]

When the disc is loaded, the reproducing operation is continued after the TOC data is acquired and the specific control data is detected or the output of the counting means reaches a predetermined value.

[0012]

Embodiments of the present invention will be described below with reference to FIG. In the following description, the normal operation of this CD graphics reproducing player will be described first. First, the operator mounts the disc on the player having the configuration shown in FIG. The mounting of the disc can be detected by closing a disc tray (not shown) of the player or by an optical element that irradiates the disc with light and receives the reflected light. When the mounting of the disc is detected by such means, the reproduction instruction means 41 constituted by software in the microcomputer 4 sends a reproduction instruction to the servo circuit 3. When the disc is loaded, the playback command means 41 is adapted to the TOC (Top of Conte
nt). Therefore, the reproduction command means that the servo circuit 3 operates the motor 2 to cause the optical pickup 1 to move the TOC (Top
of Content) is the command to move to the address.

By driving the servo circuit 3 in this way, the optical pickup 1 moves to the address of the TOC and reads the TOC data recorded on the disk D.
The read data is E by the CD-DA decoder 6.
After FM demodulation, for example, R in the microcomputer 4 or in the CD-DA decoder or externally attached
It is stored in a TOC memory (not shown) existing in the AM.
The TOC contains the number of songs recorded on the disc D, the playing time of each song, and the start address information of each song.
The information stored in the OC memory is read as needed. For example, when it is desired to display the recorded contents of the disc D on the display means 9 when the disc is mounted, the information is read from the TOC memory and the display control means 8 causes the display means 9 to display.
Can also be displayed.

Normally, the optical pickup 1 is
After the C data is acquired, the reproduction standby state is set, and the microcomputer 4 is set in the standby state for the operator to operate the operation unit (not shown). Here, when the operator operates the reproduction key of the operation section, the reproduction instruction means 41 obtains the start address of the first music piece from the information stored in the TOC memory and instructs the optical pickup 1 to move to that address. As a result, the servo circuit 3 moves the optical pickup 1 to the desired address via the motor 2.

The data reproduced by the optical pickup 1 is subjected to the above-mentioned decoding process by the CD-DA decoder 6. Here, the format of recording data on the disc D will be described with reference to FIG. FIG. 3 is a minimum recording unit of data called a frame. A sync signal is recorded in the sync pattern in the figure. Control data indicating the recorded contents of the frame is described in the sub-code, the P channel identifies the interval between songs or the song in progress, and the Q channel describes information such as the time from the beginning of the song. Has been done. The R to W channels are areas prepared for expansion, and images and M
IDI data is present. Two-channel audio data is recorded in the area described as audio data.

The data decoded by the CD-DA decoder 6 is supplied to the microcomputer 4 and the management information detecting means 42 detects the subcode. As described above, since the sub-code contains data for identifying whether the frame is between songs or during songs, the management information detecting means 42 finds a desired song based on the information. In this way, when the optical pickup 1 arrives at the beginning of the desired song, the reproducing operation is started. After being subjected to decoding processing by the reproduced CD-DA decoder 6 described above, the audio data is converted into an analog signal by the D / A converter 10. In this case, the audio data passes through the undriven mute means 11 and the audio output means. 12 are supplied. The audio output means 12 includes an amplifier and a speaker, and the analogized data is amplified by the amplifier and then emitted by the speaker.

When the management information detecting means 42 detects that the reproduction data of the optical pickup 1 contains image data, the reproduction data is transmitted to a subcode decoder such as the CD-graphics decoder 7. After being supplied and subjected to decoding processing such as error correction, it is displayed on the display means 8 by the display control means 8. What has been described above is the operation of the normal disc reproducing apparatus when the disc is mounted. The disk reproducing apparatus of the present invention is the same as the above description until the TOC data is read and the data is stored in the TOC memory in the microcomputer 4. However, the operation described below is a difference from a normal disc reproducing apparatus and is a feature of the present invention.

After the TOC data is obtained and stored in the TOC memory in the microcomputer 4, the optical pickup 1 does not enter the reproduction standby state. That is, the reproduction instruction means 41 obtains the start address of the first music piece of the disc D from the TOC memory and supplies a reproduction instruction to the servo circuit 3 to instruct the optical pickup 1 to move to that address. .. By such a command, the optical pickup 1 arrives at the address and the disc D
When the reproduction is started, the reproduction continuation judging means 42 drives the counting means 45. The counting means 45 counts the amount of data read from the disk D. At this time, the mute command means 44 operates to drive the mute means 11 to reduce the level of the reproduced audio data so that no sound is outputted to the outside.

Playback by the optical pickup 1 is started,
From the data generated by the CD-DA decoder 6, the management information detecting means 42 detects the aforementioned R to W channels in the subcode of the frame. As described above, it is possible to identify whether the audio data or the image data is included by the R to W channels. As a result of the detection operation, if the image data is not included, the operation is repeated for the next frame. If the management information detection means 42
When it is detected that the image data is included, the reproduction continuation determination means 43 causes the reproduction instruction means 41 to stop supplying the reproduction instruction. If the image data cannot be detected even if the output of the counting means 45 exceeds the predetermined data amount, it is determined that there is no image data on the disc D, and the reproduction continuation determination means 42 causes the reproduction instruction means 41. Stop playing.

As described above, when the disc is mounted, it is determined whether image data exists on the disc. As a result of the judgment, if the image data exists, the management information detecting means 42 supplies the information to the display control means 8, and when the display control means 8 receives the information, the image or the MID.
Information indicating that the I data exists can be displayed on the display unit 9.

In this example, the reproducing system having the display means such as the CD graphics player has already been described. I often use small display parts. In the CD-I or CD-ROM applied game system, the CD graphics decoder does not exist in particular, but it has a dedicated display means, which can display the presence of image (MIDI) data.

It should be noted that the predetermined data amount may be determined for several frames or the like, and the determination method may be determined by a method suitable for that case. Further, in the above embodiment, it is determined whether or not the control data detecting operation is ended depending on the amount of reproduced data. In addition to this, as shown in FIG. A method of measuring the time and determining the end of the detection operation is also conceivable. However, in this case, the operation of the means other than the time counting means 13 is the same as that described in the above-mentioned embodiment, and thus the duplicated description will be omitted.

Further, in the above description, even when the output of the counting means 45 is less than a predetermined data amount, the reproduction continuation judging means 43 controls so as to stop the reproduction operation when it detects that the image data exists. And In addition to this, there is also a method of continuing the reproduction until the output of the counting means 45 reaches the data amount without stopping the reproduction operation even when the presence of the image data is detected. However, which method is to be adopted is a matter of setting, and the method that is suitable for that case may be adopted.

The example shown here is an example in which the first part of the first track in the disc D is reproduced to search for the presence of the subcode image data. On the other hand, a method of inspecting the existence of image data by a similar method can be considered. In particular, it may happen that the inspection is missed if only one song is inspected.
By inspecting all the songs, it is possible to more reliably determine whether or not the disc contains image data. (Depending on the disc, it may be considered that image data is included only in a certain track.) Also, as a test for the existence of image data,
In addition to playing back the beginning of a song to check it, you can also combine fast-forward and fast-reverse with playback of the song or the entire disc, and scan sub-codes partially while repeating fast-forward and fast-reverse and playback to display images. A method of determining the presence or absence of data is also possible. As described above, which track is to be reproduced after reproducing the TOC information when the disc D is mounted may be described in the microcomputer 4 with software for designating the track. And when the disc is mounted,
After the C information is reproduced, the software is driven to cause the optical pickup 1 to reproduce the designated track, so that the subcode is detected.

Since the microcomputer 4 can know whether the detected subcode information is the CD graphics or the MIDI data, the CD graphics can be reproduced as the information finally displayed to the user. It is possible to display which information can be reproduced.

[0026]

As described above, according to the present invention, it is possible to judge whether or not image data and MIDI data are present on the disc D when the disc is mounted, and it is possible to display that fact on the display means 9. Therefore, the operator can record the contents of the disc. Can be known when the disc is mounted.

[Brief description of drawings]

FIG. 1 is a functional block diagram of an embodiment of the present invention.

FIG. 2 is a functional block diagram of an embodiment of the present invention.

FIG. 3 illustrates the structure of a frame that is a unit of recording data on a disc.

[Explanation of symbols]

 4 Microcomputer 41 Playback Command Means 42 Management Information Detection Means 43 Playback Continuity Judging Means

Claims (5)

[Claims] 1. A disc reproducing apparatus comprising: a reproducing unit for reproducing recorded information on a disc; and a reproducing driving unit for driving a reproducing operation of the reproducing unit when the disc is mounted, wherein the amount of data reproduced by the reproducing unit. Counting means, a control data detecting means for detecting specific control data among the data reproduced by the reproducing means, and the control data detecting means for determining the specific control data when the output of the counting means is within a predetermined value. A disc reproducing apparatus comprising: a reproduction continuation judging unit for continuing the drive of the disc reproducing operation of the reproducing unit by the reproducing driving unit until the control data is detected. 2. A disc reproducing apparatus comprising a reproducing means for reproducing recorded information on a disc and a reproducing drive means for driving a reproducing operation of the reproducing means when the disc is mounted, wherein the reproducing means starts the reproducing operation. A time measuring means driven when, a control data detecting means for detecting specific control data among the data reproduced by the reproducing means, and a control data detecting means for specifying the output when the output of the time measuring means is within a predetermined time. 2. A disc reproducing apparatus, comprising: a reproduction continuation judging means for continuing the drive of the disc reproducing operation of the reproducing means by the reproducing drive means until the control data of (1) is detected. 3. A disc reproducing apparatus comprising: a reproducing unit for reproducing recorded information on a disc; and a reproducing driving unit for driving a reproducing operation of the reproducing unit when the disc is mounted, wherein an amount of data reproduced by the reproducing unit. Counting means, a control data detecting means for detecting specific control data among the data reproduced by the reproducing means, and the control data detecting means for determining the specific control data when the output of the counting means is within a predetermined value. A disc reproducing apparatus comprising a reproduction continuation judging means for continuing the drive of the disc reproducing operation of the reproducing means by the reproducing drive means so as to perform an operation of detecting control data. 4. A disc reproducing apparatus comprising a reproducing means for reproducing recorded information on a disc and a reproducing drive means for driving a reproducing operation of the reproducing means when the disc is mounted, wherein the reproducing means starts the reproducing operation. A time measuring means driven when, a control data detecting means for detecting specific control data among the data reproduced by the reproducing means, and a control data detecting means for specifying the output when the output of the time measuring means is within a predetermined time. 2. A disc reproducing apparatus, comprising: a reproduction continuation judging means for continuing the drive of the disc reproducing operation of the reproducing means by the reproducing drive means so as to perform the operation of detecting the control data. 5. The disc reproducing apparatus according to claim 1, wherein the reproducing unit includes a reproducing track designating unit that designates a track to be reproduced when the disc is mounted.