JPS63316392A - Method for playing information recording disk - Google Patents

Abstract

PURPOSE:To quickly start video playing by immediately reading out index information from a lead-in area in a 2nd area at the time of detecting the specification of playing only for the 2nd area, and at the time of ending the playing, stopping a pickup on a position corresponding to the lead-in area of the 2nd area. CONSTITUTION:When the specification of playing only in the 2nd area (video area) of a CDV disk 1 is detected, the index information is immediately read out from the lead-in area in the 2nd area without reading out index information from the lead-in area of a 1st area (CD area), and at the time of ending the playing of the 2nd area, the pickup is stopped on the position corresponding to the lead-in area of the 2nd area. Thereby, specified information is supplied to a system controller 13 in accordance with the depression of an area specification key 19. In the system controller 13, a CPU processes a signal inputted in accordance with a program previously stored in a ROM and controls respective parts such as a driving circuit for driving a spindle motor 2, a driving circuit 16 for driving a slider motor 5 and a display part 17.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an information recording disc playing method, and particularly to an information recording disc (hereinafter referred to as
(simply referred to as a disk).

BACKGROUND ART A disc on which digital signals are recorded is a compact disc (CD) with a diameter of approximately 12 CO.
1 small digital audio disc is known, but recently, PCM with the same size as the disc
(Pulse Code Modulation)
In addition to signals 4. : Composite information recording discs (hereinafter referred to as CDV discs) on which FM-modulated video signals and PCM signals are recorded in a superimposed manner are being developed. In the case of this CDV disc, for example, the audio information is PCM.
A first area on the inner circumferential side (hereinafter referred to as the CD area) where the FM-modulated video signal and the PCM-converted audio signal are superimposed. The area is divided into a second area (hereinafter referred to as a video area) where information is recorded.

Incidentally, in a CD player, the lead-in area of the disc contains index information indicating the program contents of the disc, that is, TOC (Table of CDs).
ents) has been recorded, so when setting the disc,
At the end of the performance, the pickup mounted on the slider and positioned in the radial direction of the disc is moved toward the innermost lead-in area of the disc, and a position detection switch detects when it reaches the lead-in area and starts a new operation. The pickup is positioned in the lead-in area until a command is issued. This position is called the pickup rest position.

On the other hand, in the case of the above-described CDV disc, a lead-in area is provided for each of the CD area and the video area, and a TOC indicating the program content of each area is recorded in each lead-in area. Therefore, if the lead-in area of the CD area is set as the rest position of the pickup, especially if only the video area is played continuously,
When playing only the video areas of multiple CDV discs consecutively, the pickup must be moved to the lead-in area of the video area via the CD area lead-in area, so the video playback cannot be started using the play key, etc. A possible problem is that there is a large time delay from when the video area is specified to when the performance of the video area actually starts.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an information recording disc playing method that can quickly start video playback when playing only the video area of a CDv disc.

The information recording disc playing method of the present invention includes a first area (CD area) in which an audio information signal is digitized and recorded, and a second area (video area) in which a video information signal and a predetermined digital signal are superimposed and recorded. ) and in which index information of recorded contents is recorded in the lead-in area of the first and second areas, and when a performance specification of only the second area of the CDV disc is detected, the lead-in area of the first area is played. Immediately reads the index information from the lead-in area of the second area without reading the index information from the
When the performance of the second area is finished, the pickup is stopped at a position corresponding to the lead-in area of the second area.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a disc playing device to which the information recording disc playing method of the present invention is applied. In this performance device, a disk 1 is driven by a spindle motor 2.
The recorded information is read by the optical pickup 3. The pickup 3 shifts its information detection point in the tangential direction of the recording track and in the radial direction of the disk to perform so-called fine adjustment. Further, the pickup 3 is mounted on a slider 4 that is movable in the radial direction of the disk, and performs so-called rough adjustment. The slider 4 is linearly driven by a transmission mechanism 6 consisting of a combination of a rack and a pinion, for example, using a slider motor 5 as a drive source. Reading R output from pickup 3
The F (high frequency) signal is supplied to a video information demodulation system 8 and a digital audio information demodulation system 9 via an RF amplifier 7.

The beam spot emitted from the pickup 3 on the moving path of the pickup 3 in the disk radial direction is C.
A position detection switch 10 is provided which is turned on when the position corresponding to the innermost lead-in area on the D and CDV discs is reached. Position detection switch 10
When turned on, a high level signal is supplied to the system controller 13. Also, near the movement path of the pickup 3 in the disk radial direction, there is a position detector 14 that detects that the beam spot emitted from the pickup 3 has arrived at a corresponding position in the video area of the CDV disc and generates a detection signal. is provided. By generating this detection signal, it is possible to detect that the pickup 3 has reached the lead-in area of the video area. As the position detector 14, a well-known configuration such as an optical sensor, a slider pot, a mechanical switch, etc. can be used. A detection signal output from the position detector 14 is supplied to the system controller 13.

The system controller 13 is composed of a microcomputer including a CPU (central processing circuit), ROM (read only memory), RAM, and the like.

This system controller 13 includes a video information demodulation system 8.
The horizontal synchronization signal, vertical synchronization signal, or control data extracted in the digital audio information demodulation system 9 are supplied, and various designation information is supplied from the operation section 15. In addition to play keys, track keys, program keys, stop keys, etc. (not shown), the operation unit 15 includes a CD designation key 18 for specifying that a CDV disc is set, and a performance area when playing a CDV disc. A region designation key 19 is provided for designating only the region, only the video region, or the double head region, and designation information is supplied to the system controller 13 in response to the operation of these keys. In the system controller 13, the CPU processes input signals according to a program stored in advance in the ROM, and includes a drive circuit (not shown) that drives the spindle motor 2, a drive circuit 16 that drives the slider motor 5, and a display section. Controls various parts such as 17.

Next, a disc playing operation related to the playing method of the present invention executed by the microcomputer constituting the system controller 13 will be explained according to the flowchart of FIG.

When the microcomputer detects through a switch (not shown) that the disc is correctly set at the performance position, it first determines whether or not the disc set by operating the CDV designation key 18 is a CDV disc (step 101). ). If it is determined that a CD disc is not set, that is, if a CD disc is set, the motor drive circuit 16 drives the slider motor 5 to move the pickup 3 toward the lead-in area position on the innermost circumference of the disc ( Step 102), it is determined whether the pickup 3 has reached the lead-in area position based on the on/off state of the position detection switch 10 (Step 103). When it is determined that the pickup 3 has reached the innermost lead-in area position, the TOC information of the lead-in area on the innermost circumference of the disc is read (step 104).

Then, it is determined whether the disc to be played is a CDV disc based on the content of the read TOC information (step 105), and if it is determined that it is not a CDV disc, the disc set is a CD disc. In order to play a CD with the lead-in area position on the innermost circumference of the disc as the rest position of pickup 3,
The process moves to the play mode subroutine (step 106).

When the disc playing operation in this CD play mode is completed, the motor drive circuit 16 drives the slider motor 5 to move the pickup 3 toward the innermost lead-in area position (step 107), and the position detection switch 10 is activated. It is determined whether the pickup 3 has reached the innermost lead-in area position from the on/off state (step 108), and when it has reached the innermost lead-in area position, the drive of the slider motor 5 is stopped (step 109).
), the lead-in area position on the innermost circumference of the disc is set as the rest position of the pickup 3.

On the other hand, in step 101, if it is determined that a CDV disc is set by operating the CDV specification key 18, it is determined whether the performance area specified by the area specification key 19 of the operation section 15 is only a video area. Step 110) If only the video area is not specified, in order to play the CD area, the motor drive circuit 16 drives the slider motor 5 to move the pickup 3 toward the lead-in area position of the CD area on the innermost circumference of the disc. Then, it is determined whether the pickup 3 has reached the lead-in area position of the CD area based on the on/off state of the position detection switch 10 (step 113).

When it is determined that the pickup 3 has reached the lead-in area position of the CD area, the TOC information of the lead-in area is read (step 114), and based on the contents of the TOC information, the set disc is a CDV disc. It is determined whether or not (step 115). CDV
If it is determined that the disc is not a disc, since the set disc is a CD disc, this is assumed to be an erroneous operation of the CDV designation key, and the process shifts to the CD play mode in step 106. In this case, the contents of the command by the CDV designation key 18 are canceled and the display unit 17 indicates that it is a CD disc.
to be displayed. On the other hand, if it is determined that the disc is a CDv disc, the process moves to the CD area play mode subroutine (step 116) in order to play the CD area. Naturally, audio information is played back when playing this CD area, but the TV monitor (not shown) also receives, for example, blue screen information from a character generator (not shown) in the video information demodulation system 7. A blue screen is displayed based on the

When the disc performance operation in this CD area play mode is completed, it is determined whether or not the performance area specified by the area designation key 19 is only the CD area (step 11).
7) If only the CD area is specified, in order to move the pickup 3 to the CD area glued-in area position, go through steps 107, 108, and 109 to move the lead-in area position on the innermost circumference of the disc to the rest position of the pickup 3. shall be.

If it is determined in step 117 that only the CD area is not specified, since both the video and CD areas are specified, the spindle motor 2 is accelerated toward the maximum specified rotational speed (approximately 2700 rpm) for the video area ( Step 118), the position detector 14 detects whether the pickup 3 has reached the lead-in area position of the video area.
The determination is made from the output signal of (step 119).

If only the video area is specified in step 110, the spindle motor 2 is accelerated toward the maximum specified rotational speed in the video area in order to play the video area (step 120), and the motor drive circuit 16 drives the slider motor 5. is driven to move the pickup 3 toward the video area input area position (step 121), and the process proceeds to step 119.

When the pickup 3 reaches the lead-in area position of the video area, the TOC information of the lead-in area is read (step 122).

Then, it is determined whether or not the TOC information has been read (step 123), and if it has not been read, the CDV specification key 1
Due to the erroneous operation in step 8, it is assumed that the CDV disc is not set, and the process moves to step 107. If the TOC information has been read, the process moves to the video area play mode subroutine (step 124) in order to play the video area. In this video area, FM modulated video information and PCM audio information are recorded in a superimposed manner, and image information is reproduced.

When the disc playing operation in the play mode of the video area is completed, the motor drive circuit 16 drives the slider motor 5 to move the pickup 3 toward the lead-in area position of the video area (step 125), and the pickup 3 moves to the lead-in area position of the video area. It is determined from the output signal of the position detector 14 whether or not the lead-in area position has been reached (
Step 126). When the lead-in area position of the video area is reached, the drive of the slider motor 5 is stopped (step 127), and the lead-in area position of the video area is set as the rest position of the pickup 3.

Note that the information recording disc playing method of the present invention is not limited to an apparatus in which the number of discs that can be set is one, but can also be applied to an apparatus in which a plurality of discs can be set. In this case, when the CDV disc to be played is specified in advance from among the plurality of discs set and only the video area is to be played continuously, the pickup reads the TOC information from the video area glued-in area, so the lead-in area of the CD area is read by the pickup. The video performance can be started more quickly than when the area position is always set to the rest position of the pickup.

Furthermore, the present invention can be applied to devices capable of playing not only CDV discs but also discs of different sizes and signal systems, such as video discs.

Effects of the Invention As described above, in the information recording disc playing method of the present invention, when a performance designation for only the second area of a CDv disc is detected, the index information is not read from the first area glue-in area and the second area is immediately played. The index information is read from the lead-in area, and when the performance of the second area is finished, the pickup is stopped at the position corresponding to the lead-in area of the second area, so you can quickly play the video when only the video area of the CDV disc is to be played. can be started.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a disc playing apparatus to which the playing method of the present invention is applied, and FIG. 2 is a flow diagram showing the operation of a microcomputer within the system controller. Description of symbols of main parts 2...Spindle motor 3...Pickup 4...Slider 5...Slider motor 6...Transmission mechanism 10 ...Position detection switch 13 ...System controller 14 ...
・Position detector 15...Operation unit

Claims (1)

[Claims] A first area in which an audio information signal is digitized and recorded, and a second area in which a video information signal and a digital signal are recorded in a superimposed manner, and are recorded in the lead-in area of each of the first and second areas. A method for playing a composite information recording disc in which index information of content is recorded, wherein when a performance designation for only a second area of the composite information recording disc is detected, the index information is read from a lead-in area of the first area. The index information is immediately read from the lead-in area of the second area without any interruption, and when the performance of the second area is finished, the pickup is stopped at a position corresponding to the lead-in area of the second area. Information recording disc performance method.