JPH01273263A - Recording medium performance instrument - Google Patents

Abstract

PURPOSE:To prevent disturbance of a picture caused by a sub-code by generating a graphic code detecting signal when a graphic code is detected from the reading signal of a pickup which reads information recorded on a recording medium and inhibiting special performance operations while the graphic code detecting signal exists. CONSTITUTION:A recording medium performance instruments reproduces a disk in such a way that information recorded on the disk 20 is read by a pickup 22 while the disk 20 is rotationally driven by means of a spindle motor 21 and read signals are supplied to a video format signal demodulating/processing circuit 30 and coding information signal processing circuit 31. When a graphic code detecting circuit 90 detects a graphic code from the read signals, the circuit 90 sends a graphic detecting signal to a system controller 32. While the graphic detecting signal exists, the controller 32 inhibits special performance operations which perform in the order different from the recording order of the disk by means of the track jumping operation of the information detecting point of the pickup 22.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to a recording medium playing device such as a disc player that plays video discs and digital audio discs.

BACKGROUND ART A method has been proposed for recording and reproducing image information as a subcode on a digital audio disk having an outer diameter of about 12 cm, which is generally called a compact disk (hereinafter abbreviated as CD). The subcode is formed of 8 bits, and the bit groups forming this subcode are P, Q, RS
S, TSU%V.

It is divided into 8 channels of W. In the method of recording and reproducing image information as a subcode, as shown in Figure 11, the data corresponding to the image information is formed by 6 bits of channels R-W of the 8 bits forming the subcode to form one symbol. 98 symbols are treated as one block. Two of these 98 symbols are used as synchronization signals, and 24 symbols obtained by dividing the remaining 96 symbols into four are the minimum unit of data [Pack C
Pack)] and constitutes one image processing instruction.

The first symbol of these 24 symbols (hereinafter referred to as symbol 0) indicates the mode. Symbol 1 following symbol 0 indicating this mode is an instruction (IN5TRUcTION) indicating the type of instruction. Symbol 3 and symbol 4 following the instruction are parity Q, which is an error correction code. Each symbol from symbol 4 to symbol 19 following parity Q forms a data field and includes color information and the like. Each symbol from symbol 20 to symbol 23 following the data field is a parity P which is an error correction code for protecting the information in the back.

Modes include zero mode, line gelafix mode,
There are four types of modes: TV graphics mode and user mode. The zero mode is a mode for when, for example, you do not perform any operations on the display screen, that is, you want to leave the image as it is, and all data in the background is 0.

The line gala fix mode is a mode for displaying explanations of songs, etc. by installing, for example, a liquid crystal display on the front of the player. ] A horizontally long screen is constructed. Note that a pixel refers to the smallest displayable pixel, and 6 in the horizontal (COLUMN) direction.
Normally, image processing is performed for each screen constituent unit called a font (FONT), which is divided into pixels and divided into 12 pixels in the vertical (ROW') direction.

The number of fonts that can be displayed in this line galley fix mode is 48 in the horizontal direction and 2 in the vertical direction, which is called a screen area. Then, for the scrolling function, an image is created by adding one font to the top, bottom, left and right of the outside of the screen area. Subcodes are formed to perform the processing. Note that the area outside the screen area is called a border.

The TV graphics mode is a mode for displaying images on the TV screen, and as shown in FIG.
A screen of 8 [pixels] x 192 [pixels] vertically is configured. The number of fonts that can be displayed in this TV graphics mode is 48 in the horizontal direction and 16 in the vertical direction. Also, in this TV graphics mode, there is an address corresponding to each pixel on the screen of 50 [font] horizontally x 18 [font] vertically, which is obtained by adding one font to the top, bottom, left and right of the outside of the screen area. Subcodes are formed to perform image processing by memory.

Examples of image processing instructions include instructions to fill the entire screen with a certain color, instructions to draw a picture using two different colors for one font on the screen, and instructions to move the entire screen vertically or horizontally. .

Of the 8 bits forming the subcode, the channel Q bit contains time information corresponding to the track length from the beginning of the program area of the CD to a predetermined location of each information data recorded, and indicates the recording position. It forms address time data that can be used as position data. Further, the bits of channel P form data including inter-song information.

As described above, in the method of recording and reproducing image information as a subcode, a maximum of 16 image channels can be specified. That is, for example, the right φ font foreground/background (wRITE FONT in TV graphics mode)
The FOREGROUND/BACKGROUND) command has a configuration as shown in FIG.
This is a command to write the font conflict data of symbols 8 to 19 at the address position. For pixels whose font data is “01”, “COLOR
The color with the first color specified in "O)" is specified as the background color.If the font data is "1"
“COLORl” for the pixel of
) ” is specified as the foreground color. Also, at this time, symbol 4
The sub-picture channel can be specified by the 4 bits of channel R and S of symbol 5.

A maximum of 16 image channels can be specified. By specifying this image channel, 16 types of images can be recorded, and the user of the disc can select and reproduce a desired image channel at the time of reproduction.

In addition, each number from '0° to '15' exists as a color number. Kara number 1 "02" to Kara 1 number "15"
The 16 colors up to ``LOAD CLOTCOLOURO~COL
Set by the OUR15) command.

The load color lookup table Φ Color 0 to Color 15 has a configuration as shown in FIG. 15, and the contents of the color lookup table indicate the color of the preset color number or foreground/background color number. This is an instruction to set. It is necessary to specify 16 colors in total, but since the colors are 4 bits each for RGB, 2 symbols are required to set one color, and only 8 colors can be set in one batch. Therefore, this command requires 8 colors in the first half and 8 colors in the second half.
It is divided into two instructions, each specifying a color.

The instruction code for the first eight colors, Color 0 to Color 7, is "30", and the instruction Φ code for the second half, Color 8 to Color 15, is "31@".The color combination for each color number is , red is
Color is represented by 4 bits of channels R to U of even symbols assigned to one number, and green is represented by 2 bits of channel v1W following even symbol channels RU and channels R and S of the next odd symbol. It is represented by 2 bits, a total of 4 bits, and blue indicates the following channel T-
It is represented by 4 bits of W. Therefore, there are 2' (-16) gray scales for each color, and it is possible to mix RGBB colors and 16" (-4096) colors. Note that 'gray scale 'aaoo' is the darkest state, 'fill' ” corresponds to the brightest condition.

In the method of recording and reproducing image information as a subcode as described above, the time required to display one font on the screen is
It takes about 3.3/1000 seconds, and it takes about 2.5 seconds to display 48×16 characters.

In other words, the image information for one screen cannot be obtained unless the pickup traces the recording track for about 2.5 seconds. For this reason, in a recording medium performance device that plays a recording medium on which image information is recorded as subcodes using the conventional method, track jumps at the information detection point of the pickup are performed while reading the image information forming one screen. When a special performance operation such as double-speed playback, which reproduces recorded information in an order different from the recording order, is commanded and a track jump operation is performed, the image becomes distorted.

Summary of the Invention The present invention has been made in view of the above points, and includes:
It is an object of the present invention to provide a recording medium performance device capable of preventing image disturbance caused by subcodes even when a special performance operation is commanded.

In order to achieve the above object, the recording medium playing device according to the present invention generates a graphic code detection signal when a graphic code is detected from a read signal from a pickup that reads recorded information on a recording medium, and detects the presence of the graphic code detection signal. At times, special performance movements are prohibited.

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 10.

In FIG. 1, the disk 20 is connected to the spindle motor 21.
The recorded information is read by an optical pickup 22.

The disc 20 is a composite disc as shown in FIG. 2, and has a first area on the inner circumference side (hereinafter referred to as a
A second area (hereinafter referred to as a video area) 20b in which an FM-modulated video format signal and a digital audio signal into which a subcode containing image information is superimposed and recorded is recorded. It has The video format signal contains higher frequency components than the PCM signal, and the video area 20b
When recording signals to the CD area 20a, it is necessary to increase the rotational speed of the disc compared to when recording signals to the CD area 20a, and as a result, naturally, during playback, the disc speed is higher in the video area 20b than in the CD area 20a. must be played at a high rotation speed. The rotation speed is several hundred rpm in the CD area 20a, while it is several hundred rpm in the video area 20b at the innermost circumference of the area.

At the outermost circumference, the rotational speed is extremely high, reaching over 1,000 "p-".

A lead-in area is provided at the beginning of each of the CD area 20a and the video area 20b, and each lead-in area contains an index code related to the recorded content of each area, for example, each small part constituting each area. A first and second index code group configured corresponding to each area is recorded by repeating an index code indicating the start and end time, etc. of the audio lead-in area.
Type information indicating whether the disc is a composite disc is also included.

In addition, in order to be able to simultaneously display an image based on an FM modulated video format signal recorded in the video area and an image based on a subcode on a single screen, the conventional method for recording and reproducing image information using a subcode is used. In addition to the four types of modes: zero mode, line graphics mode, TV graphics mode, and user mode, there is also a graphics mode with motion picture (GRAPHIC3MODE WITI) as shown in Figure 3.
The applicant of the present application has separately proposed setting a code to be inserted as symbol 0 to specify IMOTION PICTURE).

The screen configuration in the graphics mode with motion picture is the same as in the TV graphics mode, and there is a load transparency control table (LOAD TRAN) configured as shown in FIG.
There is an instruction called SPARENCY C0NTR0L TABLE). This load transparency control table instruction is an instruction that specifies the mode of each pixel on the screen.

There are three modes specified by this command: transparent mode, mixed mode, and non-transparent mode. In these three types of modes, the mixing ratio of the video format signal obtained by the subcode and the video format signal multiplexed and recorded together with the coded information signal including this subcode is set to a different value.

Each bit of channels R to W of each symbol from symbol 4 to symbol 8 and channel R1S of symbol 9 is designated as each color registered as color 1 number "0" to color 1 number "15#". Codes TCB-0 to TCB-15 specifying the mode for each pixel
is formed. Figure 5 shows these codes TCB-0~
The correspondence between the bit pattern of TCB-15 and each mode and the mixing ratio in each mode are shown.

The pickup 22 that reads recorded information on the disk 20 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 front axis direction with respect to the information recording surface of the disk 20, and a pickup. A tracking actuator and the like for biasing the beam spot (information detection point) emitted from the recording track 22 in the radial direction of the disk is included. The pickup 22 is mounted on a slider 23 that is movable in the radial direction of the disk, and the slider 23 is linearly driven by a transmission mechanism 25 that uses a slider motor 24 as a drive source and is composed of a combination of a rack and a pinion, for example. A read RF (high frequency) signal output from the pickup 22 is supplied to a video format signal demodulation processing circuit 30 and a coded information signal demodulation processing circuit 31 via an RF amplifier 26.

The video format signal demodulation processing circuit 30 includes, for example, R
It has a demodulation circuit that demodulates the F-fold signal and converts it into a video format signal, and a memory that stores the demodulated video format signal after digitizing it, and the video format signal output from the demodulation circuit and the video format signal read out from the memory. The configuration is such that one of the video format signals is selectively output in response to a switching command from the system controller 32. The video format signal output from this video format signal demodulation processing circuit 30 is supplied to a video switch 33. The video format signal demodulation processing circuit 30 is also provided with a separation circuit that separates and extracts the horizontal synchronization signal, vertical synchronization signal V and control data C from the demodulated video format signal. The synchronization signal RI, v, and control data C are supplied to each section such as the system controller 32.

On the other hand, the coded information signal demodulation processing circuit 31 is provided with a selection switch 35 that is switched depending on the area to be reproduced (CD area and video area) during reproduction of the composite disc. sometimes a
When the video area is played back, it is on the b side, and the switching is performed in response to a switching command issued from the system controller 32. 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, for example, E F M (Eight
to Fourteen Modulation)
In the video domain, if the digital signal is directly superimposed on the FM-modulated video signal during recording, the EFM signal will have a negative effect on the low-frequency components of the FM video signal, so the degree of modulation is Although it is equivalent, the EFM signal is recorded in a state where the signal level is suppressed by several dozen degrees compared to the video carrier. Therefore, the same EFM signal has different frequency characteristics and amplitude when playing back the CD area and when playing the video area. Therefore, by switching the signal processing system of the reproduced EFM signal between the CD area and the video area, the demodulation system can be changed. The aim is to share the information.

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 36 having predetermined equalizing characteristics, and is further amplified by an amplifier 37 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 38 consisting of an LPF or the like, and the frequency characteristic is compensated by an equalizer circuit 39 which has equalization characteristics different from that of the equalizer circuit 36, and is further larger than that of the amplifier 37. By being amplified by the amplifier 40 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 compact disc, the selection switch 35 is always in the state where the a side is selected.

The reproduced EFM signal selected by the selection switch 35 is EFM
The signal is supplied to the demodulation circuit 42. The EFM demodulation circuit 42 is
The configuration is such that the reproduced EFM signal is demodulated to obtain PCM data, that is, digital data and subcodes including, for example, time-division multiplexed audio information of both left and right channels. Digital data including audio information output from the EFM demodulation circuit 42 is supplied to a deinterleaving/interpolation circuit 43. Day interleave
The interpolation circuit 43 cooperates with the RAM 44 to restore the digital data whose order has been rearranged by the increment performed during recording, and sends it to the error correction circuit 45, and the error correction circuit 45 outputs an uncorrectable signal. When this occurs, the error data in the output data of the error correction circuit 45 is interpolated by an average value interpolation method or the like. The error correction circuit 45 includes one CI RC (Cross Inter
leave Reed Sol.

(on Code) and supplies the digital data to the deinterleaving/error correction circuit 43, and if correction is not possible, an uncorrectable signal is simultaneously supplied to the deinterleaving/error correction circuit 43. There is.

The output data of the deinterleaving/interpolation circuit 43 is I;
)/A (digital-to-analog) conversion circuit 46. The D/A conversion circuit 46 includes a demultiplexer that separates digital data including time-division multiplexed left and right channel audio information from each other;
Both left and right channel audio signals are played. After unnecessary components are removed from the reproduced audio signals of both left and right channels by LPFs (low pass filters) 47 and 48, they are supplied to audio output terminals OUT+ and 0UT2 via amplifiers 49 and 50.

On the other hand, of the subcodes output from the EFM demodulation circuit 42, 2 bits of channels P and Q are supplied to the system controller 32, and 6 bits of channels R to W are supplied to the deinterleaving/error correction circuit 52. .

In the de-interleaving 9 error correction circuit 52, de-interleaving of 6 bits of channels R-W and error correction using parities Q and P are performed. Output data of the deinterleaving/error correction circuit 52 is supplied to a mode/instruction decoder 53.

The mode/instruction decoder 53 decodes the mode specified by the 3 bits of channel RT of symbol 0 of each pack, the mode specified by the item represented by 3 bits of channels U-W, and the channel of symbol 1 of each pack. The structure is such that an instruction represented by 6 bits of R-W is decoded and a signal indicating the mode and instruction is supplied to each section. The output data of the deinterleaving/error correction circuit 52 is sent to the graphic code detection circuit 90.
is also supplied. Graphic code detection circuit 90
is configured to detect a code constituting an image processing command from the output data of the deinterleaving/error correction circuit 52 and generate a graphic code detection signal. The output of this graphic code detection circuit 90 is supplied to the system controller 32.

Further, the output data of the deinterleaving/error correction circuit 52 is supplied to an image memory device 55.

The image memory device 55 has 16 RAMs 56a to 56p, which have addresses corresponding to all pixels on a screen of 50 fonts horizontally and 18 fonts vertically, and each address can store 4-bit data, and a mode/ Depending on the mode and type of instruction indicated by the output of the instruction decoder 53, data indicating the color number of each pixel of each image channel in the output data of the deinterleaving/error correction circuit 52 is detected and the corresponding address of the RAM 568-56p is detected. The horizontal and vertical synchronizing signals h % V L are used to sequentially read in a predetermined order one memory content corresponding to the image channel specified by the data d corresponding to the key operation of the operation unit 60 from among the RAMs 56a to 56p. It consists of a memory control circuit 57.

The data output from the image memory device 55 is supplied to a color look up table (hereinafter referred to as CLUT) 58. The CLUT 58 controls the deinterleaving/error correction circuit 52 depending on the mode and instruction type indicated by the output of the mode/instruction decoder 53.
Load/CLUTφ color 0 to color 7 command and load/CLUT color 8 to color 1 of the output data of
5 command is detected, the color data corresponding to each color number is held, and from among the held color data, the color data of the color number indicated by the output data of the image memory device 55 is selected and output. ing.

The output data of the CLU 758 consists of three pieces of data each representing the level of each color signal of R and GSB with 4 bits. RSG, B output from CLU758
The three data representing the level of each color signal are as follows:
The signals are supplied to D/A conversion circuits 61, 62, and 63 and converted into analog signals. The outputs of these D/A conversion circuits 61 to 63 are supplied to an analog video conversion circuit 65. The analog video conversion circuit 65 is, for example, the D/A conversion circuit 6.
A luminance signal and two color difference signals are obtained by the outputs of 1 to 63, and the signals obtained by parallel modulating two color subcarriers having a phase difference of 90'' from each other using the two color difference signals are added to form a carrier color signal. , this carrier color signal is added to the luminance signal, and a synchronization signal is added to form an NTSC video signal.The analog video conversion circuit 65 converts the D/A conversion circuits 61 to 61 to
The output of 63 is converted into a video signal and sent out.

Further, the output data of the deinterleave 9 error correction circuit 52 is also supplied to a transparency control table (hereinafter referred to as TCT) 66. TCT6
6 is a load TC of the output data of the deinterleaving/error correction circuit 52 depending on the mode and instruction type indicated by the output of the mode/instruction decoder 53.
Transparency O control bits TCB-0 to TCB- corresponding to each color number by detecting the T command
15, and one of the held TCB-0 to TCB-15 corresponding to the color number indicated by the data read from the image memory device 55 is selected and output.

The output of this TCT 66 is supplied to the video switch 33 as a control signal. The video switch 33 has a TCT
In addition to the output of 66, a video format signal obtained from the subcode and output from analog video conversion circuit 65 and a video format signal output from video format signal demodulation processing circuit 30 are supplied.

In the video switch 33, the video format signal obtained from the subcode is directly supplied to the fixed contact X of the changeover switch 68, and simultaneously supplied to the fixed contact y via the resistor R1. The fixed contact 2 of the changeover switch 68 has an open end.

The changeover switch 68 switches the movable contact U to one of the fixed contacts X5ys2 according to the control signal output from the TCT66.
It is configured to selectively output a signal supplied to one of the fixed contacts x, y, and z by contacting the fixed contacts. Further, the video format signal output from the video format signal demodulation processing circuit 30 is directly supplied to the fixed contact 2 of the changeover switch 69, and at the same time is supplied to the fixed contact y via the resistor R2. The fixed contact X of the changeover switch 69 has an open end. The changeover switch 69, like the changeover switch 68, is configured to bring the movable contact U into contact with one of the fixed contacts x, y, and z in response to a control signal. The movable contacts U of these changeover switches 68 and 69 are connected to each other.

A resistor R3 is connected between the common connection point J of these movable contacts U and the ground.
is connected. A signal obtained by mixing the video signal obtained from the subcode and the video format signal output from the video format signal demodulation processing circuit 30 is derived from this common connection point J. When the movable contact U of the changeover switch 68, 69 contacts the fixed contact X, the mixing ratio of the video format signal obtained from the subcode becomes 100%, and when the movable contact U contacts the fixed contact 2, the mixing ratio becomes 0.
%. Further, the values of the resistors RI and R2 are set so that when the movable contact U contacts the fixed contact y, the mixture ratio becomes M (M is 20 to 80%).

The signal derived to the common connection point J is connected to the video output terminal 0UT.
3.

Near the movement path of the pickup 22 in the disk radial direction, a detection signal is generated by detecting that the beam spot emitted from the pickup 22 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 70 is provided. By generating this detection signal, it is possible to detect that the pickup 22 has reached the video area. As the position detector 70, one having a well-known configuration such as an optical sensor can be used. A detection signal output from the position detector 70 is supplied to the system controller 32.

The system controller 32 is composed of a microcombiator including a processor, ROM (read only memory), RAM, and the like.

This system controller 32 has a horizontal synchronization signal,
Vertical synchronization signal V and control data c, EFM demodulation circuit 42
Each bit of channels P and Q in the subcode output from the
Disc designation information indicating whether the disc is a disc or a composite disc, mode designation information indicating whether the playback area during playback of the composite disc is only the CD area, only the video area, or both areas are supplied. In this system controller 32,
The processor processes the input signal according to a program stored in advance in the ROM, and controls each part of the video format signal demodulation processing circuit 30, the selection switch 35. It controls various parts such as a drive circuit (not shown) that drives the spindle motor 21, a drive circuit 71 that drives the slider motor, and a display section 72.

FIG. 6 is a block diagram showing a specific circuit example of the video format signal demodulation processing circuit 30, in which the RF multiplied signal from the RF amplifier 26 is demodulated into a video signal by the demodulation circuit 75,
Thereafter, it is supplied to a time base correction circuit 76 and a separation circuit 77. The separation circuit 77 separates the horizontal synchronizing signal h1, vertical synchronizing signal V and control data C included in the video format signal.
are separated and extracted. For example, the time axis correction circuit 76
CD (Charge Coupled Devlce)
It is configured to perform time axis correction by changing the delay amount of the element in accordance with a control signal from the time axis control circuit 78. The time axis control circuit 78 includes a crystal oscillator (VCXO) that oscillates in synchronization with, for example, the horizontal synchronization signal separated and extracted by the separation circuit 77.
) 79 and its frequency-divided output, and a control signal corresponding to the phase difference between the horizontal synchronization signal and color burst signal in the video signal that has passed through the time axis correction circuit 76. Regarding the structure, see JP-A-56-
This is shown in JP-A No. 102182 and the like.

The time axis corrected video signal is supplied to a selection switch 80 and is also supplied to an A/D (analog/digital) converter 82 via an LPF (low pass filter) 81. In the A/D converter 82, 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 82 is supplied to a video memory 83 consisting of a RAM (Random Medium Access Memory) or the like.

As the video memory 83, one having a storage capacity capable of storing at least one field's worth of video information is used. Address control and mode control of this video memory 83 are performed by a memory control circuit 84. The memory control circuit 84 sequentially reads the data written in each address of the video memory 83 using the clock from the reference clock generation circuit 85 and controls the data of the video memory 83 in response to the write enable signal W output from the system controller 32. The configuration is such that control is performed to rewrite the contents of each address. The data read from the video memory 83 is D/A (digital/analog)
The signal is converted into an analog signal by the converter 86, and is applied to the selection switch 80 via the LPF 87. Selection switch 8
0 is normally located on the a side and selectively outputs the video format signal directly supplied from the time axis correction circuit 76, and switches to the b side in response to a switching command from the system controller 32, thereby controlling the video memory 83. selectively outputs the video format signal that has passed.

The operation of the processor in the system controller 32 in the above configuration will be explained with reference to the flowcharts of FIGS. 7 and 8.

It is assumed that the composite disc has already been set at the playback position, and in this state, when a start command is issued from the operation unit 60, the processor sends a drive command to the motor drive circuit 71 to drive the slider motor 24. The pickup 22 is moved to the innermost position of the disk (step Sl). When a detection switch (not shown) detects that the pickup 22 has reached the innermost circumference position, the processor focuses the pickup 22 and then returns the index recorded in the audio lead-in area on the innermost circumference of the disc. The code information is read (step S2), and then, based on this read information, it is determined whether or not the set disc is a composite disc (step S3). If it is a compact disc, the mode directly shifts to the CD play mode (step S4), and the playback operation continues unless there is a command such as program selection. Note that since the playback operation in the CD play mode is well known, the explanation will be omitted here.

If it is determined in step S3 that the disc is a composite disc, the processor immediately accelerates the spindle motor 21 toward the maximum prescribed rotational speed in the video area (step S5), and simultaneously drives the slider motor 24 to rotate at high speed to pick up the disc. 22 is moved toward the outer circumference of the disk at high speed (step S6). Thereafter, when it is detected by the detection signal from the position detector 70 that the pickup 22 has reached the video area (step 87), the processor starts the reproduction operation of the video area (step S8). During playback of this video region, the processor processes at least one field (
or one frame of predetermined video information is controlled to be written into the video memory 83. This video information to be written may be the first information in the video area, and may also be specified in advance by addressing, for example, by operating keys on the operation unit 60.

When it is detected in step S9 that the playback of the video area has ended, the processor decelerates the spindle motor 21 toward the maximum prescribed rotational speed in the CD area (step 510), and simultaneously drives the slider motor 24 to rotate at high speed to pick up the data. 22 is moved at high speed to the innermost position of the disk (step 511). When it is detected that the pickup 22 has reached the innermost circumferential position of the disk based on the detection output of the aforementioned detection switch (not shown) (step 512), the processor starts the reproduction operation of the CD area (step 513). At the same time, the processor switches the selection switch 80 in the video format signal demodulation processing circuit 30 to the b side, selects the video information written in the video memory 83 during playback of the video area, outputs the video, and outputs the video information during playback of the CD area. Play still images. When it is detected by reading the audio readout information that the playback of the CD area has ended (step 514), if there is no particular operation command, the processor drives the slider motor 24 to move the pickup 22 to the home position. (step 515)
), the disc is further ejected by a loading mechanism (not shown), and the series of playback operations is completed.

Further, during execution of a main routine or the like, an interruption by a timer or the like causes the processor to proceed to step S20 and determine whether or not a search operation has been commanded by a key operation on the operation unit 60. When it is determined in step 520 that a search operation has been commanded, the processor starts the search operation (step 521), and determines whether the search operation is terminated depending on whether the difference between the target address and the read address becomes less than or equal to a predetermined value. Upon detection (step 522), execution of the routine that was being executed immediately before proceeding to step S20 is resumed. When it is determined in step S20 that a search operation has not been instructed, the processor operates the operation unit 60.
It is determined whether or not a special performance operation, that is, a track jump operation of the information detection point of the pickup 22, is commanded by the key operation, such as double-speed playback, scanning, etc., in which recorded information on the disk 20 is played in an order different from the recording order. (Step 523). Note that the track jump operation is performed by driving a tracking actuator within the pickup 22 or by driving the slider 23.

When it is determined in step 323 that a special performance operation has been commanded, the processor determines whether or not a graphic code detection signal is output from the graphic code detection circuit 90 (step 524). Step S2
When it is determined in step 4 that the graphic code detection signal is output, the processor immediately proceeds to step S.
The execution of the routine that was being executed immediately before the transition to step 20 is resumed. If it is determined in step S24 that the graphic code detection signal is not output, the processor performs the commanded special performance operation until the stop of the special performance operation is commanded by key operation on the operation section 60 (step S25. 526), resumes execution of the routine that was being executed immediately before proceeding to step S20.

After the recorded information in the video area of the composite disc is reproduced in steps 81 to S9 in the above operation, the recorded information in the CD area is reproduced in steps 810 to S14.

Now, while the video area is being played, the mode/instruction decoder 53 loads, CLUT, and color.
Color 7 instruction and load CLUT - When color 8 to color 15 instructions are decoded, CLUT58 contains 409
Color data for 16 designated colors out of 6 colors is held.

Thereafter, 16 channels of image data are stored in the RAMs 56a to 56p in the image memory device 55 by decoding the light, font, foreground/background commands, etc. When one of the 16 channels of image data is designated by data corresponding to a key operation on the operation unit 60, the image data of the designated channel is sequentially output from the image memory device 55 and supplied to the CLUT 58. Then, the color data of the first color indicated by the image data is output from the CLUT 5g. A video format signal based on this color data is output from the analog video conversion circuit 65 and supplied to the video switch 33.

Here, when the load TCT instruction is decoded, the TCT
66, the transparency conflict control bits TCB-0 to TCB-15 corresponding to each color number are held. And the retained TCB-0 to TCB-1
5, one corresponding to the color number indicated by the data output from the image memory device 55 is selectively T.
The signal is output from the CT 66, and the mixing ratio in the video switch 33 is specified by the output of the TCT 66. Then, the mixing ratio of the video format signal output from the analog video conversion circuit 65 and the video format signal output from the video format signal demodulation processing circuit 30 is controlled on a pixel-by-pixel basis. As a result, for example, as shown in FIG. 9, the mixing ratio of the portion corresponding to each pixel outside the area of image A by the video format signal output from the video format signal demodulation processing circuit 30 is reduced to 1.
00%, the mixing ratio of the portion corresponding to each pixel within the area is set to 0%, and the mixing ratio of the portion corresponding to each pixel outside the area of image B by the video format signal output from the analog video conversion circuit 65 is set to 0%. Obtained by combining the part of image A outside the area and the part of image B inside the area by setting the mixing ratio to 0% and the mixing ratio of the part corresponding to each pixel in the area to 100%. Image C can be formed.

Therefore, as shown in FIGS. 10(A) to 10(C), subtitles, musical scores, and scene descriptions are added to moving images obtained from video format signals recorded in the video area or still images obtained from the video memory 83 using subcodes. This means that sentences etc. can be inserted.

Also, as a matter of course, the analog video conversion circuit 65
If the mixing ratio of the video format signal outputted from the subcode is set to 100% over the entire screen, only an image based on the subcode can be obtained.

Further, when a special performance operation is commanded by key operation on the operation section 60, it is determined in step S24 whether or not a graphic code detection signal is output, and if the graphic code detection signal is output, that is, the image information Special performance operations are prohibited when recorded as a subcode. Therefore, while a series of graphic codes forming one screen image is being read, a special performance operation is commanded and the pickup 2
This makes it possible to prevent image disturbance caused by the sub-code due to the track jump of the second information detection point.

In the above embodiment, the special performance operation is prohibited by step S24 in the program in the system controller 32, but when the graphic code detection signal is present, a code instructing the special performance operation is output from the operation unit 60. You may choose not to do so.

Furthermore, in the above embodiment, the recording medium on which the subcode carrying image information is recorded is a composite disc called CDV, but the recording medium on which the subcode carrying image information is recorded is called LDD. It is also possible to use other recording media, such as a disc on which FM-modulated video format signals, audio signals, and digital audio signals are multiplexed.

Effects of the Invention As detailed above, in the recording medium playing device according to the present invention, when a graphic code is detected from a read signal from a pickup that reads recorded information on a recording medium, a graphic code detection signal is generated, and a graphic code detection signal is generated. When it exists, special performance movements are prohibited, so even if a special performance movement is commanded while a series of graphic codes forming one screen image is being read, the special performance movement will be prohibited. Therefore, the information detection point of the pickup does not jump the track, and the disturbance of the image due to the subcode is prevented.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing the recording area of a composite disc, FIG. 3 is a diagram showing the types of recording modes, and FIG. 4 is a diagram showing the loading mode. FIG. 5 is a diagram showing the correspondence between the TCB bit pattern and the mixing ratio. FIG. 6 is a video format signal demodulation processing circuit in the device shown in FIG. 1. 30, FIGS. 7 and 8 are flowcharts showing the operation of the processor in the system controller 32 of the apparatus shown in FIG. FIG. 11 is a diagram showing the recording format of the subcode, FIG. 12 is a diagram showing the screen configuration in the line graphics mode, and FIG. 13 is the screen configuration in the TV graphics mode. 14 is a diagram showing the structure of the light font foreground/background command, and FIG. 15 is a diagram showing the structure of the light font foreground/background command.
It is a diagram showing load color lookup table color 0 to color 7 instructions. Applicant: Pioneer Corporation Pioneer Video Corporation

Claims (1)

[Claims] A recording medium playing device that plays a recording medium on which a graphic code containing image information in addition to a coded information signal is inserted as a subcode into the coded information, the pickup reading the recorded information of the recording medium. a graphic code detection means that generates a graphic code detection signal when a graphic code is detected from the read signal from the pickup; and when the graphic code detection signal is present, a recording medium is detected by a track jump operation of the information detection point of the pickup. 1. A recording medium performance apparatus comprising: special performance prohibition means for prohibiting a special performance operation in which the recorded information is played in an order different from the recording order.