JPH01178167A - Composite disk and its playing method - Google Patents

Abstract

PURPOSE:To enable an image display unit to be used by responding each video information represented as a video signal in a third area to each music represented as a voice digital signal in a second area. CONSTITUTION:Still pictures Pv, Qv, Rv, and Sv corresponding to the music P, Q, R, and S recorded in a CD area (second area), respectively, are recorded in a video area (third area). Also, a play decision signal which represents correspondence relation between the music recorded in the CD area and the still picture recorded in the video area is recorded on the TOC information of an audio read-in area (first area). And the recording position of the music can be discriminated, for example, by combining the address of the music P, position identification information such as the address of the still picture Pv corresponding to the above address, the order of the music, a time code, and a track number, etc., with a play discrimination signal. In such a way, it is possible to listen to the music as enjoying a background picture by utilizing the image display unit.

Description

[Detailed description of the invention] Technical field The present invention relates to a composite disc and a method of playing the same.

BACKGROUND ART A small digital audio disc with a diameter of approximately 12 CIlls, called a so-called compact disc (hereinafter simply referred to as CD), is known.
In addition to a signal recording area (Modulation), a composite disk has been put into practical use that has an area in which an FM-modulated video signal and a PCM signal are multiplexed and recorded. Such a composite disc is hereinafter referred to as a CDV disc.

An example of a CDV disc is shown in FIG. 1(B). So-called TOC information is recorded in the audio lead-in area on the innermost disc of a CDV disc, and by reading this information, a series of performance information such as song number, address, playing time, and total performance up to that song can be obtained. You can get the time, video information address, etc. On the outer circumferential side of the TOC area, there is an area in which audio information is recorded as PCM (hereinafter referred to as CD area), and an FM-modulated video signal and an audio signal as PCM are multiplexed, for example. Recorded area (hereinafter referred to as video area)
is formed. An audio lead-out area (not shown) is provided at the outermost periphery of the CD area. Similarly, a video lead-in area and a video lead-out area are provided at the innermost and outermost peripheries of the video area, and are used to detect the start and end of the area, respectively.

With conventional 120III CDV discs, the CD
Four songs (songs: P, QSR, S) are recorded in the area, and one song (video-T) is recorded in the video area.

Incidentally, a disc player capable of playing CDV discs is equipped with an image display, and it is considered desirable to utilize such an image display even while playing songs in the CD area.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a composite disc and a method for playing the same, which makes it possible to utilize an image display when playing songs in the CD area.

In order to achieve the above object, a composite disc according to the first invention of the present application is a composite disc in which performance control information, an audio digital signal, and a video signal are respectively recorded in first, second, and third areas, and the third area is Each piece of video information represented by the video signal in the second area corresponds to each piece of music represented by the audio digital signal in the second area.

Further, in the composite disc performance method according to the second invention of the present application, the performance control information, the audio digital signal, and the video signal are respectively recorded in the first, second, and third areas of the disc, and are represented by the video signal in the third area. A method for performing a composite disc in which video information to be displayed is recorded corresponding to each song represented by an audio digital signal in the second area, the method comprising: reading performance control information in the first area; A video signal in a third area corresponding to a specified song to be played according to the control information is read and stored, and an audio digital signal representing the specified song is read and demodulated, and at the same time, the stored video signal is converted into a still image. It is characterized by being regenerated.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIG. 1(A). In the composite disc shown in FIG. 1(A), the songs PSQS recorded in the CD area (second area)
Still images Pv, Qv, Rv, and Sv corresponding to R and S, respectively, are recorded in the video area (third area). A video signal and an audio signal may be multiplexed and recorded in a video area that carries these still images. A performance discrimination signal indicating the correspondence between the song recorded in the CD area and the still image recorded in the video area is sent to the audio lead-in area (first
area) is recorded in the TOC information.

For example, by combining the address of the song P, the address of the corresponding still image PV, the song order, time code, position identification information such as track number, etc. with the performance discrimination signal, or as a performance discrimination signal part of the TOC. By recording at a predetermined specific position, the recording position can be determined.

For example, on a 12 cm CDV disc, it is usually possible to record 20 minutes in the CD area and 5 minutes in the video area, and it is possible to record still images for 4 songs in the video area.

When the CDV player determines that a CDv disc is loaded, it first reads the TOC and determines that the disc has recorded songs and still images corresponding to each picture. Prior to a predetermined performance, still image information corresponding to several songs is searched and read into a video memory, and the stored still images are output at the same time as the performance of the target song starts.

It is also possible to increase the capacity of the video memory, store a plurality of still images in advance, and switch the still images to be output as the music performance progresses.

FIG. 2 shows an example of a CDV player suitable for playing the above-mentioned CDV disc. In the figure, a disk 1 is rotationally driven by a spindle motor 2, and recorded information is read by an optical pickup 3.

The pickup 3 includes an optical system including a laser diode, an objective lens, a photodetector, etc., and a focus actuator that drives the objective lens in the direction of its optical axis with respect to the information recording surface of the disk 1. A tracking actuator and the like are built in to bias the beam spot (information detection point) in the disk radial direction with respect to the recording track. The pickup 3 has a slider 4 that is movable in the radial direction of the disk.
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. pickup 3
The read RF (high frequency) signal output from the RF amplifier 7
through the video information demodulation system 8 and digital information demodulation system 9
is supplied to

In the video information demodulation system 8, the RF from the RF amplifier 7
The signal is demodulated into a video signal by a double signal demodulation circuit 10, and then supplied to a time base correction circuit 11 and a separation circuit 12. The separation circuit 12 extracts a horizontal (H) synchronization signal, a vertical (V) synchronization signal, and TOC information of the video area included in the video signal.
Control data such as address data of the performance music is separated and extracted. The time axis correction circuit 11 includes, for example, COD (Cha
rgeCoupled Device), and the delay amount of the element is controlled by the time axis control circuit 1
The configuration is such that time axis correction is performed by changing the time axis according to the control signal from 3. Time axis control circuit 13
For example, the oscillation output of the crystal oscillator (VCXO) 14 that oscillates in synchronization with the horizontal synchronization signal and its frequency divided output separated and extracted by the separation circuit 14, and the horizontal synchronization signal in the video signal that has passed through the time axis correction circuit 11. It is configured to output a control signal according to the phase difference between the color burst signal and the color burst signal.
Regarding its specific structure, please refer to JP-A-56-102182.
It is shown in the publication number etc.

The time axis corrected video signal is supplied to a selection switch 15 and is also supplied to an A/D (analog/digital) converter 17 via an LPF (low pass filter) 16. In the A/D converter 17, the video signal is sampled at a predetermined period, and the obtained sample values are sequentially converted into digital data. The output data of this A/D converter 17 is supplied to a video memory 18 consisting of a RAM (random access memory) or the like.

The video memory 18 used has a storage capacity capable of storing at least one field's worth of video information. Address control and mode control of the video memory 18 are performed by a memory control circuit 19. The memory control circuit 19 is connected to a system control 21 which will be described later.
The operation of the video memory 18 is controlled according to the contents of a mode command signal M including a write command, a read command, a read area switching command, a memory clear command, etc. output from the video memory 18.

The clock supplied from the reference clock generation circuit 20 to the memory control circuit 19 is used to generate an address signal that specifies the address of the video memory 18. Video memory 1
The data read from 8 is D/A (digital/
analog) is converted into an analog signal by the converter 22, and the LP
It becomes another input to the selection switch 15 via F2B. The selection switch 15 is normally located on the a side and supplies the video signal directly supplied from the time axis correction circuit 11 to the video output terminal 24, and is switched to the b side in response to a switching command from the system controller 21 to output the video memory. 18 is selected and supplied to a video output terminal 24. An image display device such as a CRT (not shown) is connected to the video output terminal 24 to reproduce images.

On the other hand, the digital information demodulation system 9 is provided with a selection switch 25 that switches depending on the area to be played back (CD area and video area) when playing back a composite disc. When the video area is played back, it is located on the a side, and when the video area is played back, it is located on the b side, and the switching is performed in response to a switching command issued from the system controller 21.

In the case of a composite disc, the rotational speed of the disc is extremely different between the CD area and the video area, and the PCM audio signal is e.g.
(teen Modulation) signal, and in the video area, the digital signal is converted directly to F during recording.
When superimposed on a video signal subjected to M modulation processing, EFM
Since the signal has an adverse effect on the low-frequency components of the FM video signal, the EFM signal is recorded with the signal level suppressed by several tens of degrees relative to the video carrier, although the modulation degree is the same. Therefore, even with the same EFM signal, CD
Since the frequency characteristics and amplitude will be different when reproducing the area and when reproducing the video area, by switching the signal processing system of the reproduced EFM signal between the CD area and the video area,
The aim is to share the demodulation system.

That is, when reproducing the CD area, the reproduced RF signal is EF
The EFM signal has its frequency characteristics compensated by an equalizer circuit 26 having predetermined equalizing characteristics, and is further amplified by an amplifier 27 with a predetermined gain. On the other hand, in the case of video area playback, FM is included in the playback RF signal.
Only the EFM signal included with the video signal is extracted by an EFM extraction circuit 28 consisting of an LPF or the like, and the frequency characteristic is compensated by an equalizer circuit 29 which has equalizing characteristics different from that of the equalizer circuit 26. By being amplified by the amplifier 30 having a gain, it is output as an EFM signal with frequency characteristics and amplitude equivalent to those during CD region reproduction.

Incidentally, when playing back a CD disc, the selection switch 25 is always in a state where side a is selected.

The reproduced EFM signal selected by the selection switch 25 is demodulated and
The signal is supplied to the correction circuit 31. This demodulation/correction circuit 31 demodulates the EFM signal and writes it into a memory such as a RAM, controls the RAM based on the clock from the reference clock generator 32, extracts data, de-interleaves it and converts it into data. Error correction is performed using the included parity, and control data such as a frame synchronization signal, CD area TOC information, and song address information is detected from the EFM signal. The digital audio signal demodulated and corrected by the demodulation/correction circuit 31 is converted into a D/A
After being signal-processed by an audio signal processing circuit 33 consisting of a converter, a degree/sociator circuit, etc., the signal is supplied to left and right channel audio output terminals 34L and 34R.

A detection signal is generated near the travel path of the pickup 3 in the disk radial direction by detecting that the beam spot emitted from the pickup 3 has arrived at a position corresponding to the vicinity of the boundary between the CD area and the video area on the composite disk. A position detector 35 is provided. By generating this detection signal, it is possible to detect that the pickup 3 has reached the video area. As the position detector 35, one having a well-known configuration such as an optical sensor can be used. A detection signal output from the position detector 35 is supplied to the system controller 21.

The system controller 21 is composed of a microcomputer including a CPU (central processing circuit), ROM (read only memory), RAM, and the like.

This system controller 21 receives the horizontal synchronization signal, vertical synchronization signal and control data from the separation circuit 12, as well as demodulation and control data.
frame synchronization signal and control data from the correction circuit 31;
Disc specification information indicating whether the disc to be played is a CD or CDV, performance mode specification information indicating the performance mode when playing a composite disc, performance song specification information specifying the performance of only a specific song, etc. are supplied from the operation unit 36. Ru. In this system controller 21, the CPU processes input signals according to a program stored in advance in the ROM,
It controls the selection switches 15, 25, the memory control circuit 19, the drive circuit (not shown) that drives the spindle motor 2, the drive circuit 37 that drives the slider motor, the display section 38, etc. monitors control data from the demodulation/correction circuit 31 and the like.

Incidentally, the rotation control of the spindle motor 2 during the performance of a CDV disc is performed by the demodulation/correction circuit 31 of the digital information demodulation system 9, regardless of the performance area, based on the frequency and phase error between the frame synchronization signal in the EFM signal and the reference clock. This is done based on the spindle error signal generated from the spindle error signal.

Next, a disc performance control procedure executed by the CPU constituting the system controller 21 when a disc is played by the disc player having such a configuration will be described with reference to the flowchart of FIG. 3.

In FIG. 3, when a CDV disc is placed on the turntable and a command to start playing is issued from the operating section 36, the player starts operating.

First, the CPU executes the main control program and
When a flag indicating that the performance designation information input from 1 is in the performance mode with background image is detected, the process moves to this subroutine and reads the TOC information.

This information includes the address of each image stored in the CD area, the address of still image information for each song recorded in the video area, a performance discrimination signal indicating this type of recording, etc. . Note that it is not necessarily necessary to prepare still image information for each song, and for example, certain still image information can be shared by a plurality of songs. In this case, the same still image information address is specified for the plurality of songs (step 511). The disc loaded is a CDV based on the already mentioned disc designation information from the operation unit 36 or by detecting that the TOC information includes the TOC of the video portion in addition to the normal CD lead-in information. When it is determined (step 512), performance music designation information indicating the music to be performed supplied from the operation unit 36 is read (step 813), and it is determined whether or not the corresponding music exists (step 514).
). If the loaded disc is not a CDV, this performance mode with background image cannot be executed, so the process returns to the main control program (step 512). Also, if there is no corresponding song, the program returns to the main control program and ends this subroutine (step 514).

If the corresponding song exists, the still image information to be the background image of the song is read (in step 51, the spindle motor 2 is accelerated toward the maximum specified rotation speed of the video area).
5), the pickup 3 is moved in the outer circumferential direction (step 516). After that, when it is detected that the light spot (information detection point) of the pick-up 3 has reached the video area based on the detection output of the position detector 35 (step 517).
, the switch 15 is connected to the b side, and the switch 25 is connected to the b side, and the address of the still image information that becomes the background image of the performance music is searched (step 518). When the address of the still image information is detected (step 519), a V sync defining one field is detected from the demodulated video signal (step 519).
20) Start supplying a write command signal to the memory control circuit 19 to write video data into the video memory 18 (step 521). When V sync is detected again from the demodulated video signal (step 522), the supply of the write command signal is stopped to cause the memory control circuit 19 to stop writing video data.

Next, in order to play music in the CD area, the spindle motor 2 is decelerated (step 524), and the pickup 3 is moved inward (step 525).

Return the pickup 3 to the standard position on the inner circumference of the disc,
When the switch 25 is connected to the a side and moved to the outer circumferential direction again to read the lead-in area of the CD area (step 52
6) Search for the performance-designated music recorded in the CD area (step 527). When the search for the target is completed (step 828), the supply of a read command signal instructing the memory control circuit 19 to read the stored video signal is started, and the still screen is displayed on the previously described screen display (step 52).
9) Start playing the song (step 529). The end of the music is read from the control data obtained by playing several songs, or the end of the performance is detected if the data is not demodulated for a certain period of time (step 531). When the end of the performance is detected, the supply of the read command signal to the memory control circuit 19 is stopped and the process returns to the main control program (step 532).
. Still image playback ends when the readout command signal stops, but the readout command signal continues to be supplied until the next song starts playing or other still image information is read. The blank screen state may be shortened. If the performance mode with background screen is still specified in the main control program, the subroutine is repeated from step 813 in which the next performance-designated music is read.

In this way, it is possible to enjoy the performance of the song while displaying background images related to the performance song, such as the lyrics of the song, the musical score, and BGV (background video) on the image display.

In the embodiment, a video memory for one field was used, but this can be used as a memory for one frame to store video information for two fields, and playback can be performed by reading out each field alternately. Image quality can be improved. It is also possible to store a plurality of screens using a video memory with a larger capacity, and to switch the display screens sequentially as the music performance progresses. In this case, since the CD includes a subcode for system control, for example, if a screen switching signal is inserted into the so-called user's bit of this subcode, and the switching signal is read as the performance progresses, The readout screen can be changed sequentially. Further, by recording a signal specifying an output screen in the user's bit, it is also possible to read out a specific screen among the plurality of screens stored in the memory. Also,
It is also possible to provide a mode in which screens with different tastes, such as lyrics and scenery, are recorded in advance in the video area for each image, and only one of them is selected as the background image.

As described in detail of the invention, according to the composite disc and the recording and reproducing method thereof according to the present invention, the disc is provided with a CD area in which only digital signals are recorded and a video area in which frequency-modulated video signals are recorded. The video information is pre-recorded in the video area corresponding to each song recorded in the CD area, and when the player plays the CD area, the player demodulates the video information corresponding to the song to be played and displays it on the image display. This is preferable because it is possible to listen to the song while enjoying the background screen using the image display.

[Brief explanation of the drawing]

FIG. 1(A) is a diagram showing the division of the information recording area on a CDV disc according to the present invention, FIG. 1(B) is a diagram showing the division of the recording area of a standard CDV, and FIG. FIG. 3 is a block diagram showing an example of a disc player for playing a CDV disc according to the present invention. FIG. 3 is a flowchart showing the control procedure of the CPU. Explanation of symbols of main parts 1...Disk 2...Spindle motor 3...Optical pickup 5...Slider motor 8...Video Information demodulation system 9...Audio information demodulation system 15.25...Selection switch 21...System controller Applicant: Pioneer Corporation

Claims (3)

[Claims] (1) A composite disc in which performance control information, audio digital signals, and video signals are respectively recorded in first, second, and third areas, wherein each video information represented by the video signal in the third area is recorded in the third area. A composite disc characterized in that the disc corresponds to each of the songs represented by audio digital signals in two areas. (2) A patent characterized in that the performance control information includes song address information indicating a range in which an audio digital signal representing the song exists and video address information indicating a range in which a video signal representing the video information exists. A composite disc according to claim 1. (3) Performance control information, audio digital signals and video signals are respectively recorded in the first, second and third areas of the disc, and each video information represented by the video signal in the third area is recorded in the second area. A method of playing a composite disc recorded corresponding to each piece of music represented by an audio digital signal, the method comprising: reading performance control information in the first area; and determining a designated piece of music to be played according to the performance control information. A composite disc characterized in that the video signal in a third area corresponding to the designated song is read and stored, the audio digital signal representing the designated song is read and demodulated, and at the same time, the stored video signal is reproduced as a still image. How to play.