JPH01221073A - Image information recording and reproducing system - Google Patents

Abstract

PURPOSE:To selectively display recorded image information in a partial area of an image by inserting a graphic code and an instruction code as a sub-code in a coding information signal to record the information in a recording medium and mixing a signal corresponding to the graphic code in a part determined by the instruction code at the time of reproducing. CONSTITUTION:When a window set instruction is decoded, data representing a zero % mixing ratio of video format signals instructed by a sub-code is written in an address of a window attribute memory device 67 corresponding to a font outside the widow. But, in an address corresponding to a font inside the window, data representing a designated mixing ratio is written. A mixing ratio for the part of an image B by video format signals instructed by a sub- code outputted from an analog video signal conversion circuit 65 which corresponds to respective fonts in a window D is set 100%. As a result, an image C can be formed by synthesizing parts of an image A outside the window D and those of the image B in the window D together.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a method for recording and reproducing image information on a recording medium such as a video disc or a digital audio disc.

BACKGROUND ART When the contents of a movie film source are recorded on a recording medium such as a video disc and played back, characters such as translated subtitles are usually superimposed on the screen from the beginning. The characters obtained by such conventional methods are
Since it is always displayed regardless of the user's intention, it can be a nuisance in some cases. In addition, there was the problem of having to create master discs for each language. Therefore, characters were encoded using the so-called closed caption method, and the blanking period of a video format signal whose content was information obtained from a movie film source. One possible method is to insert the characters into a part that does not appear on the screen and reproduce the characters using a dedicated decoder. According to this method,
Characters can be displayed as necessary by on/off control of a dedicated decoder.

However, since the amount of data that can be inserted in the closed caption method is small, it is only possible to display subtitles in Japanese characters.
The problem of having to create master recordings for each country remains.

On the other hand, a method has been proposed in which image information is recorded as a subcode on a digital audio disc and reproduced. The subcode is formed of 8 bits, and the bit groups forming this subcode are P and Q.

It is divided into 8 channels: R, S, T, and USVSW. In the method of recording and reproducing image information as a subcode, as shown in Fig. 12, 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 the remaining 96 symbols are divided into four, resulting in 24 symbols, which are treated as the minimum unit of data [pack], and one image processing command. It consists of

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 parity P, which is an error correction code for protecting the information in the pack.

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, no operation is to be performed on the display screen, that is, when it is desired to leave the image as it is, and all data in the pack is 0.

The line gala fix mode is a mode for displaying the explanatory outline of a song by installing a liquid crystal display or the like on the front of the player, for example, and as shown in Figure 13, it is a mode that displays 288 [pixels (PIXEL)] horizontally x 24 [pixels vertically]. ] A horizontally long screen is constructed. Note that a pixel refers to the smallest displayable pixel, and 6 in the horizontal (COLUMN) direction.
Divided into pixels and 1 in the vertical (ROM) direction
Normally, image processing is performed for each screen constituent unit called a FONT, which is divided into two pixels.

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 Figure 14, the TV graphics mode is a mode for displaying images on the TV screen.
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, the time required to display one font on the screen is 3.
．． It takes about 3/1000 seconds, and it takes about 2.5 seconds to display 48x16 characters.

This means that data for 48x16 characters can be recorded on the track traced by the pickup for about 2.5 seconds, which is sufficient to record subtitles in several languages. However, in the conventional recording and playback method using this subcode, images such as characters obtained are displayed using the entire screen, so images such as characters obtained can be used to display videos containing information obtained from a movie film source, etc. It was not possible to superimpose subtitles on images based on format signals and view them at the same time.

Summary of the Invention The present invention has been made in view of the above points, and includes:
Recording of image information that can record a large amount of data including image information such as characters along with other information, and that can selectively display the recorded image information in a partial area of an image formed by a video format signal. The purpose is to provide a playback method.

The image information recording/reproducing method according to the present invention inserts a graphic code containing image information and an instruction code specifying an area on a two-dimensional screen formed by a video format signal as a subcode of a coded information signal. It is characterized in that it is recorded on a medium, and upon reproduction, a signal corresponding to the graphic code is mixed into a portion determined by the instruction code in the video format signal.

EXAMPLES Hereinafter, examples of the present invention will be described in detail with reference to FIGS. 1 to 11.

First, as shown in FIG. Set the code to be inserted as symbol 0 to specify the graphics mode.

The screen configuration in the Extemporized Reingeller Fix mode is the same as the Reingelar fixing mode, with a set window (SE) configured as shown in Figure 2.
There is an instruction called T VINDOV). The set window command in this line graphic Φ mode is a command to set a rectangular area called "window °" at the position on the screen specified by the 4 bits of channel T-W of symbol 4.Line graphic mode Since the screen area is only two fonts in the vertical (row) direction, the entire screen area is set as a window, and only the vertical position of the window on the CRT display screen is set as a window, as shown by diagonal lines in Figure 3. Furthermore, the mixing ratio is specified by the two bits of channels R and S forming symbol 4, and this mixing ratio will be described later.

The screen configuration in extemped TV graphics mode is the same as that in TV graphics mode,
An instruction called SET WINDOW with the configuration shown in FIG. 4, an instruction called PRESET BORDER with the configuration shown in FIG. 5, which is a modification of the instruction called PRBSET MEMORY in TV graphics mode, ) There is an instruction with a configuration as shown in FIG. 6, which is a modified version of the instruction called .

The set window command in extemped TV graphics mode is symbol 6 and symbol 7.
This command sets a rectangular area called "1 window" defined by the position on the screen specified by and the positions specified by symbol 8 and symbol 9.The point (s, The position of the vertical blade s) in the y direction is represented in row (ROM) by 5 bits of channel S-W of symbol 6, and the position of the point (s)
The position of the column (COLUMN) in the horizontal direction is determined by the 6 bits R-W of the symbol
). Also, the vertical position y of the point (e, e) corresponding to the lower right corner of the window is determined by the 5 bits of S-W of symbol 8.
”), and the position of the point (e, e) in the horizontal edge y direction is represented by the column (COLUMN) by the 6 bits R-W of symbol 9.
A window as shown by diagonal lines in FIG. 7 is set on the display screen by the window command.

Furthermore, the display within the set window is obtained by mixing the video format signal obtained based on the subcode and the video format signal that has been subjected to FM modulation and multiplexed recording together with the digital signal including this subcode. The mixing ratio is specified as one of 0%, 30%, 70%, and 100% by the 2 bits of channels R and S of symbol 4.

The preset memory command in Extemped-TV Graphics Mode is the same as the command in TV Graphics Mode by the color number "0" specified by the 4 bits of channel T-W forming symbol 4.
Specify the color of all fonts in memory as one of the 16 colors from `` to color number ``15'', and set the mixing ratio in the window using the 2 bits of channels R and S forming symbol 4. This is an instruction to set the value shown.

Similarly to the command in the TV graphics mode, the preset-border command in the extempid-TV graphics mode changes the color of all fonts in the border part of the memory to the 4th channel T-W that forms the symbol 4. Color number “0” specified by bit
This command specifies one of the 16 colors from color number "15#" and sets the mixing ratio in the window to the value indicated by the 2 bits of channels R and S forming symbol 4. be.

In addition, 1 from the empty number "0'" to the empty number "15"
The 6 colors are Load Color Lookup Table Color 0 to Color 15 in TV graphics mode (
LOAD CLUT C0LOURO~C0LOUR1
5) Set by command. The load color lookup table Color 0 to Color 15 has a configuration as shown in FIG. 8, and the contents of the color lookup table indicate the color of the preset color number or the foreground/background color number. This is an instruction to set. It is necessary to specify 16 colors in total, but the colors are RG
Since each B has 4 bits, two symbols are required to set one color, and only eight colors can be set in one pack. For this reason, this command is divided into two commands that respectively designate the first eight colors and the latter eight colors.

The instruction Φ code for the first eight colors, Color 0 to Color 7, is "30" and the instruction code for the second half, Color 8 to Color 15, is "312." The color combination for each color number is as follows: Red is
Color is represented by 4 bits of channel R-U of even symbols assigned to one number, and green is represented by 2 bits of channel vSW following channel R-U of even symbols 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 since they are RGBB colors, it is possible to mix 163 (-4096) colors. In addition, the gray scale "0000" is the darkest state, "
1111'' corresponds to the brightest state.

Also, write font foreground/background (WRIT
E FONT PORE GROUND/13ACKGR
OUND) command has a configuration as shown in FIG. 9, and is an command to write the font data of symbols 8 to 19 at the row address defined by symbol 6 and the column address defined by symbol 7. It is. For a pixel whose font data is '01', the color numbered 1 defined by "Color 0 (COLOI? O)" is designated as the background color. For pixels whose font data is “1”, “color 1”
(COLOR1) ” is specified as the foreground color. At this time, the sub-picture channel can be specified using the 4 bits of channels R and S of symbol 4 and symbol 5. A maximum of 16 image channels can be specified. By specifying these image channels, 16 types of images can be recorded, and the side using the disk can select the desired image channel and play it back. Can be done.

FIG. 10 shows a composite disc on which a digital audio signal as a coded information signal into which a subcode containing image information is inserted as described above is recorded. In the same figure,
The composite disc 20 has a first area (hereinafter referred to as CD area) 20a on the inner circumferential side where digital audio and signals in which subcodes including image information are inserted are recorded, and an F
It has a second area (hereinafter referred to as a video area) 20b in which an M-modulated video format signal and a digital audio signal into which a subcode containing image information is inserted are recorded in a superimposed manner. The video format signal contains higher frequency components than the PCM signal, and when recording the signal to the video area 20b, the CD area 20b
It is necessary to increase the rotational speed of the disc compared to when recording to 0a, and as a result, the C
It is necessary to reproduce the disc at a higher rotational speed in the video area 20b than in the D area 20a. The rotation speed is several hundred rpI1 in the CD region 20a.
1, whereas in the video area 20b, the rotation speed is extremely high, 2,000-plus rpm at the innermost circumference of the area, and 1,000-plus rpm at the outermost circumference.

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.

FIG. 11 shows a disc player for reproducing recorded information on the composite disc as described above. In FIG. 11, a disk 20 is rotationally driven by a spindle motor 21, and recorded information is read by an optical pickup 22. As shown in FIG. The pickup 22 includes an optical system including a laser diode, an objective lens, a photodetector, etc., 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 beam spot emitted from the pickup 22. A tracking actuator and the like for biasing the information detection point (information detection point) in the disk radial direction with respect to the recording track is built in. 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, for example, a combination of a rack and a pinion. The read RF (high frequency) signal output from the pickup 22 passes through the RF amplifier 26 to the video format signal demodulation processing circuit 30 and the coded information signal demodulation processing circuit 3.
1.

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. Further, this video format signal demodulation processing circuit 30 is provided with a separation circuit that separates and extracts the horizontal synchronization signal h1, the vertical synchronization signal V, and the control data C from the demodulated video format signal, and these separated horizontal and vertical synchronization signals hSv 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
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 tens of outputs with respect 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
The signal is extracted by an EFM extracting circuit 38 consisting of an LPF or the like, its frequency characteristics are compensated by an equalizer circuit 39 having equalizing characteristics different from those of the equalizer circuit 36, and further amplified by an amplifier 40 having a larger gain than the amplifier 37. , it is output as an EFM signal with frequency characteristics and amplitude equivalent to those during CD area reproduction.

Incidentally, when playing 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 I-key circuit 42. The EFM demodulation circuit 42 is configured to demodulate the reproduced EFM signal 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. The deinterleaving/interpolation circuit 43 cooperates with the RAM 44 to restore the digital data whose order has been rearranged by the interleaving performed during recording, and sends it to the error correction circuit 45, and the error correction circuit 45 outputs an uncorrectable signal. It is configured to interpolate error data in the output data of the error correction circuit 45 by an average value interpolation method or the like when output. The error correction circuit 45 is a CI RC (Cross Interlea
ve Reed Sol.

The circuit is configured to perform error correction based on the digital data (son code) and supply the digital data to the deinterleaving/error correction circuit 43, and if correction is impossible, simultaneously supplying an uncorrectable signal to the deinterleaving/error correction circuit 43. .

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

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-W are supplied to the deinterleaving/error correction circuit 52. .

In the de-interleaving φ 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 to 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.

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 each having addresses corresponding to all pixels on a screen of 50 fonts horizontally by 18 fonts vertically, and each address can store 4-bit data. Depending on the mode and instruction type indicated by the output of the mode/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 data is stored in the RAMs 56a to 56p. Write to the corresponding address, and 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 among the RAMs 56a to 56p using the horizontal and vertical synchronizing signal hSv. 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/CLUT-color 0 to color 7 command and load-CLUT/color 8 to color 1 of the output data of
5 command, holds color data corresponding to each color number, and selects and outputs the color data of the color number indicated by the data read from the image memory device 55 from among the held color data. It becomes.

The output data of this CLUT 58 consists of three data each representing the level of each color signal of R, G, and B with 4 bits. R, GSB output from CLUT58
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. These D/A conversion circuits 61 to 63
The output of is supplied to an analog video conversion circuit 65.

The analog video conversion circuit 65 obtains a luminance signal and two color difference signals from the outputs of the D/A conversion circuits 61 to 63, for example, and parallel modulates two color subcarriers having a phase difference of 90@ with the two color difference signals. The obtained signals are added together to obtain a carrier color signal, and this carrier color signal is added and synthesized with the luminance signal, and a synchronization signal is added to generate the NTSC signal.
It is configured to form a video format signal of the system.

This analog video conversion circuit 65 converts the outputs of the D/A conversion circuits 61 to 63 into video format signals and sends them out.

Further, the output data of the deinterleaving/error correction circuit 52 is also supplied to the window attribute memory device 67.

The window attribute memory device 67 has addresses corresponding to all fonts on the screen of 50 fonts horizontally x 18 fonts vertically, and includes a RAM 68 that can store 2-bit data at each address, and a mode/instruction decoder 53. Depending on the mode and type of command indicated by the output of the device, the device consisting of the deinterleaving/error correction circuit 52 detects data indicating the position of the window in the output and data indicating the mixing ratio, and corresponds to the font in the window of the RAM 68. At the address corresponding to the font outside the window, write data indicating the detected mixing ratio, and at the address corresponding to the font outside the window, write data corresponding to the mixing ratio of 0% of the video format signal obtained by the subcode, and horizontal and vertical synchronization. It consists of a memory control circuit 69 that sequentially reads out the contents of the RAM 68 in a predetermined order in response to a signal hSv. The output data of this window attribute memory device 67 is supplied to a switch control circuit 70. The switch control circuit 70 is configured to supply a control signal to the video switch 33 according to the mixing ratio of each font indicated by the output data of the window attribute memory device 67. The video switch 33 includes a switch control circuit 70.
In addition to the output of , a video format signal obtained from the subcode and output from the analog video conversion circuit 65 and a video format signal output from the 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 V of the changeover switch 72, and simultaneously supplied to the fixed contact xSY via the resistors RI and R2.

The fixed contact 2 of the changeover switch 72 has an open end. The changeover switch 72 switches the movable contact t to the fixed contacts u, x,
Fixed contacts uSx, y, in contact with one of y, z,
The configuration is such that a signal supplied to one of the signals z is selectively output.

Further, the video format signal from the video format signal demodulation processing circuit 30 is directly supplied to the fixed contact 2 of the changeover switch 73, and at the same time is supplied to the fixed contact VsX via resistors R3 and R4.

The fixed contact U of the changeover switch 73 has an open end. The changeover switch 73, like the changeover switch 72, is configured to bring the movable contact t into contact with one of the fixed contacts uSx, ySz in response to a control signal. The movable contacts t of these changeover switches 72 and 73 are connected to each other. A resistor R5 is connected between the common connection point J of these movable contacts t and the ground. A signal obtained by mixing the video format signal obtained from the subcode and the video format signal from the video format signal demodulation processing circuit 30 is derived from this common connection point J.

When the movable contact t of the changeover switch 72, 73 contacts the fixed contact U, the mixing ratio of the video format signal obtained by the subcode becomes 100%, and when the movable contact t contacts the fixed contact 2, the mixing ratio becomes 0%. Become. Furthermore, when the movable contact t contacts the fixed contact X, the mixing ratio becomes 70%, and when the movable contact t contacts the fixed contact y, the mixing ratio becomes 30%.
% of the resistors R1 to R4.

The signal led to the common connection point J is connected to the video output terminal OUT.
, is supplied to.

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 75 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 75, one having a well-known configuration such as an optical sensor can be used. A detection signal output from the position detector 75 is supplied to the system controller 32.

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

This system controller 32 has a horizontal synchronization signal h1.
Vertical synchronization signal V and control data cSEFM 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 a CD area, only a video area, or a double-headed area, etc. 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 76 that drives the slider motor, and a display section 77.

FIG. 12 shows the video format signal demodulation processing circuit 30.
is a block diagram showing a specific circuit example of the RF amplifier 26.
The signal is demodulated into a video signal by an RF multiplied signal demodulation circuit 80, and then supplied to a time axis correction circuit 81 and a separation circuit 82. The separation circuit 82 separates and extracts the horizontal synchronizing signal h1, the vertical synchronizing signal V, and the control data C included in the video format signal. The time axis correction circuit 81 includes, for example,
CCD (Charge Coupled Device
), etc., and 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 83. The time axis control circuit 83 includes a crystal oscillator (VCX) that oscillates in synchronization with, for example, the horizontal synchronization signal separated and extracted by the separation circuit 82.
O) It is configured to output a control signal according to the phase difference between the oscillation output of 84 and its frequency divided output, and the horizontal synchronization signal and color burst signal in the video signal that has passed through the time axis correction circuit 81. Regarding the specific configuration, see Japanese Patent Application Laid-open No. 1986.
-102182, etc.

The time axis corrected video signal is supplied to a selection switch 85 and is also supplied to an A/D (analog/digital) converter 87 via an LPF (low pass filter) 86. In the A/D converter 87, 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 87 is supplied to a video memory 88 consisting of a RAM (random access memory) or the like.

As the video memory 88, 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 88 are performed by a memory control circuit 89. The memory control circuit 89 sequentially reads the data written in each address of the video memory 88 using the clock from the reference clock generation circuit 90 and controls the data of the video memory 88 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 88 is D/A (digital/analog)
The signal is converted into an analog signal by a converter 91, and is applied to the selection switch 85 via an LPF 92. Selection switch 8
5 is normally located on the a side and selectively outputs the video format signal directly supplied from the time axis correction circuit 81, and switches to the b side in response to a switching command from the system controller 32, thereby changing the video memory 88. 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 flowchart in FIG. 13.

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 76 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 circumferential position, the processor adjusts the focus of the pickup 22.
After that, the index code information recorded in the audio lead-in area on the innermost circumference of the disc is read (step S2), and based on this read information, it is determined whether the disc set is a composite disc or not. It is determined whether or not (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). After that, when it is detected by the detection signal from the position detector 75 that the pickup 22 has reached the video area (step S7),
The processor starts a playback operation of the video area (step S8). During playback of this video area, the processor controls the writing of at least one field (or one frame) of predetermined video information obtained from the disk into the video memory 88. 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 specified 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 813). At the same time, the processor switches the selection switch 85 in the video format signal demodulation processing circuit 30 to the b side, selects the video information written in the video memory 88 during video area playback, outputs it as output, and outputs it during the playback period of the CD area. The still image is played back. When it is detected that the playback of the CD area has ended by reading the audio readout information (step 514), if there is no particular operation command, the processor drives the slider motor 24 to return 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.

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 S10 to S14. Now, the mode/instruction decoder 53 loads the CLU while playing the video area.
When the T color 0 to color 7 instructions and the load CLUT color 8 to color 15 instructions are decoded, the CLUT
58 holds color data of designated 16 colors out of 4096 colors.

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 specified by data d corresponding to a key operation on the operation unit 60, the image data of the specified channel is sequentially output from the image memory device 55 and supplied to the CLU 758. Then, the color data of the first color indicated by the image data is stored in the CLUT58.
is output from. A video signal based on this color data is output from the analog video conversion circuit 65 and supplied to the video switch 33.

Now, when the window set instruction is decoded,
In the window attribute memory device 67, data indicating a mixing ratio of video format signals of 0% by subcode is written to the address corresponding to the font outside the window specified by the window set command of the RAM 68, and corresponds to the font inside the window. Data indicating the mixing ratio specified by the window set instruction is written to the address. R of this window attribute memory 67
The data read from AM68 is sent to the video switch 33.
The mixing ratio of the video format signal supplied to the analog video conversion circuit 65 and the video format signal output from the video format signal demodulation processing circuit 30 is controlled in units of fonts. As a result, as shown in FIG. 14, the mixing ratio of the portion corresponding to each font in the window D of the image A by the video format signal output from the video format signal demodulation processing circuit 30 is set to 0%, that is, the analog video signal conversion circuit 65 If you set the mixing ratio of the portions of image B corresponding to each font in window D to 100% based on the video format signal output from the subcode output from the subcode, then the portions of image A outside window D and the image @! Image C can be formed by combining the portion of image B with the portion within window D. Note that by writing data indicating a 100% mixing ratio of video format signals according to the subcode to the address corresponding to the font outside the window specified by the window φ set command of the RAM 68 in the window attribute memory device 67, the image It is also possible to form an image obtained by combining a portion of image A within window D and a portion of image B outside window D.

Therefore, as shown in FIGS. 15(A) to 15(C), subtitles, musical scores, scene descriptions, etc. can be inserted into moving images obtained from video format signals recorded in the video area using subcodes. Become.

In addition, by inserting data corresponding to characters in each language into each image channel, subtitles in multiple languages can be recorded on a single disc, and the desired language can be selected by key operation on the operation unit 60. This means that subtitles can be selectively displayed, eliminating the need to create master discs for each country.

The case where image information is recorded and reproduced using 6 bits of channels R-W of the subcode has been described above, but characters, symbols, etc. as image information are encoded and inserted into channel Q for recording, and the window is It is conceivable to record and reproduce image information using only channel Q by setting it at a predetermined position. In this case, 64 bits of data can be inserted into channel Q in 1/75 [second], so 48 bits of data can be inserted in 1 second.
This means that 00 bits of data can be inserted.

Of these 4800 bits, 9/10 are used as track number, minute, and second data, so the maximum is 4800 bits.
1/10 of the 00 bits can be used as data representing characters, symbols, etc. Therefore, for example, if characters of three Japanese languages are inserted, 160 bits can be allocated to one Japanese language per second, and the same effect as in the above embodiment can be obtained.

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 may be an LDD. It is also possible to use other recording media, such as a disc called FM-modulated video format signal, an audio signal, and a disc on which digital audio signals are multiplexed.

Effects of the Invention As detailed above, the image information recording and reproducing method according to the present invention converts a graphic code containing image information and an instruction code specifying an area on a two-dimensional screen formed by a video format signal into a coded information signal. The subcode is inserted as a subcode and recorded on the recording medium, and during playback, the signal corresponding to the graphic code is mixed with the part determined by the instruction code in the video format signal, so data containing image information such as characters is A large amount of information can be recorded, and the recorded image information can be selectively displayed in a partial area of the image formed by the video format signal.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing types of recording modes in the present invention;
FIG. 2 is a diagram showing the configuration of the set window command in extemped line graphics mode,
Figure 3 shows the window in the Extemporized line graphics mode, and Figure 4 shows the set window in the Extemporized TV graphics mode.
FIG. 5 is a diagram showing the structure of the window command, FIG. 5 is a diagram showing the structure of the preset memory command, and FIG. 6 is a diagram showing the structure of the preset memory command.
FIG. 7 is a diagram showing the configuration of the border command; FIG. 7 is a diagram showing a window in expanded TV graphics mode; FIG. 8 is a diagram showing the load color lookup table color 0 to color 7 command; Figure 9 is a diagram showing the structure of the light font foreground/background command, Figure 10 is a diagram showing the recording area of a composite disc, and Figure 11 is a diagram showing the recording area of a composite disc. Block diagram showing a device for reproducing image information, video format signal demodulation processing circuit 3 in the device of FIGS. 12 and 11^
13 is a block diagram showing a specific circuit example of 0.
A flowchart showing the operation of the processor in the system controller 32 of the device shown in the figure, FIGS. 14 and 15 are diagrams showing images obtained by the device shown in FIG. 11, and FIG. 16 is a diagram showing the recording format of the subcode. , FIG. 17 is a diagram showing the screen configuration in line gala fix mode, and FIG. 18 is a diagram showing the screen configuration in TV graphics mode. Figure 2 Figure 3 Figure 4 Figure 9 Figure 12 Figure 14 Figure 13

Claims (3)

[Claims] (1) In addition to the video format signal and the coded information signal, a graphic code containing image information and an instruction code that specifies an area on the two-dimensional screen formed by the video format signal are subcodes of the coded information signal. 1. A recording and reproducing method for image information, characterized in that a signal corresponding to the graphic code is inserted into a recording medium and recorded on a recording medium, and a signal corresponding to the graphic code is mixed into a portion determined by the instruction code in the video format signal during reproduction. (2) The graphic code is composed of a plurality of code groups, and when playing, any one of the plurality of code groups is selected according to a command, and the image signal obtained by decoding the selected code group is 2. The image information recording and reproducing method according to claim 1, wherein the image information is mixed with the video format signal. (3) The code group includes a type identification code, and upon reproduction, after storing the code group in different storage areas according to the type identification code, any one of the recording areas is selected according to the instruction, and the code group is selected. 3. The image information recording and reproducing method according to claim 2, wherein an image signal obtained by decoding a code group obtained from the storage area is mixed with the video format signal.