JPS62250575A - Disk reproducing device - Google Patents

Abstract

PURPOSE:To facilitate the selective setting of picture display of a desired channel number by displaying the result of the count of a counter means in a different form depending whether the content of a storage area inverted by a setting means is a 1st data or a 2nd data. CONSTITUTION:In operating a select key 27b, the count of the count register at that time, that is, the content of bits F0-Ff of a flag register corresponding to channel numbers CH0-CH15 displayed on a color CRT display device 32 is inverted. Thus, only two keys, up key 27a and select key 27b are used so as to make the picture extracting instruction of the channel numbers CH0-CH15 effective and ineffective selectively. Then the display form of the channel numbers CH0-CH15 displayed on the color CRT display device 32 is changed in response to whether the bits F0-Ff of the flag register corresponding to the channel numbers CH0-CH15 selected by the count of the said count register, that is, the operation of the up key 27a are '0' or '1'.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) This invention is applicable to optical CDs (compact discs), for example.
The present invention relates to a disc playback device based on the above-mentioned method, and particularly to an improvement of an image display system using subcode data.

(Prior Art) As is well known, in the field of audio equipment, audio signals are converted into digitized data using PCM (pulse code modulation) technology in order to record and reproduce them with as high density and high fidelity as possible. Digital recording and reproducing systems that record information on a recording medium such as a disk or magnetic tape and reproduce it are now in widespread use. Among these, those that use a disk as a recording medium have a diameter of 1
Compact discs, which are 2 cm discs on which pit rows corresponding to digitized data are formed and are read optically, are now the mainstream.

On the other hand, a disc playback device that plays back a compact disc as described above moves an optical pickup containing a semiconductor laser, a photoelectric conversion element, etc. in a linear tracking manner from the inner circumference side of the disk toward the outer circumference side. The data recorded on the compact disc is read by rotating the compact disc at constant linear velocity (CLV).

Here, in addition to digital audio data, subcode data for improving operability and realizing multifunctionality is recorded on the compact disc. This subcode data is P per frame (588 bits).
, Q, R, S, T, LJ.

It consists of 8-bit data called v and W.

Among these, the subcode data P is provided for distinguishing between songs and within a song, and for example, "1" represents a song interval,
"011" indicates the middle of the song.The above subcode data Q is called address data, and in the program area of the disc (radius 25 to 58 mm), the song number (TNO) of the famous song recorded on the disc is ), verse number (index), elapsed time, etc., and in the lead-in area (radius 23 to 25 mm) of the disc, it is TOC (Table of Contents) data indicating the start address of the famous song.

The other 6-bit subcode data R to W are currently displayed on the screen of a color CRT display, for example.
It is used to construct color graphics image data for displaying color graphics images. This color graphics image data is
Data is roughly divided into data that constitutes the image area of the font, and data for image operation commands to instruct, for example, to scroll the display screen, and each data consists of 6 bits and 24 symbols, as shown in Figure 7. (This is called 1 bag).

Of these, symbol O is mode/item data and specifies a display screen mode, which will be described later. Further, symbol 1 is instruction data indicating whether the data constitutes the 1-font image area described above or the data of an image manipulation command. And symbol 4~
Reference numeral 19 denotes a data component that constitutes a one-font image area or constitutes an image manipulation command.

Note that symbols 2 and 3 and symbols 20 to 23 are error correction parity data Q and P generated by Reed-Solomon code, respectively, and this parity data Q
, P are used to perform data error determination and error correction.

Here, the display screen modes designated by the symbol O include ZERO mode, LINE graphic mode, TV graphic mode, and the like.

Among these, the TV graphics mode is for constructing one screen of color graphics images of 288 pixels (horizontal) x 192 pixels (vertical) on the screen of a color CRT display. In addition, the above LINE mode is 28
One screen is composed of 8 pixels (horizontal) x 24 pixels (vertical), and is used, for example, in a simple display device using liquid crystal.

As shown in FIG. 8, the 1-font image area is composed of 6 pixels (horizontal) x 12 pixels (vertical).

Therefore, the configuration of one screen in the TV graphic mode is as shown in FIG. 9, 48 fonts (horizontal) x
16 fonts (vertical), and the configuration of one screen in the LINE graphic mode is 48 fonts (horizontal) x 2 fonts (vertical), as shown in FIG.

The above-mentioned one pack of color graphics image data corresponds to an image area of one font, and each pixel ( 6X 12
It stores data for bits. Therefore, in order to construct one screen in the TV graphics mode, it is necessary to record 48 packs x 16 packs (768 backs) of color graphics image data on the disk.

In addition, the color graphics image data of one back is
In fact, since data is recorded on the disk at a cycle of about 3 m5ec, it takes 768 x 3 m5ec=2.3 Sec to compose one screen in the TV graphic mode. In the TV graphic mode, 16 colors can be selected from a prespecified color palette, making it possible to express subtle colors such as intermediate colors, and to provide vivid screen display.

Furthermore, as mentioned above, in the back of the color graphics image data in the TV graphics mode and LINE graphics mode, in addition to the data constituting the 1-font image area, there is also data for image manipulation commands. be. The type of image manipulation command is specified by the instruction data of symbol 1, and includes, for example, a command to scroll the entire screen, a command to fill the entire screen with one color, etc. By combining these commands, you can create an effective screen. It is designed so that it can be displayed.

Of the display screen modes mentioned above, ZERO mode is a mode that does not affect the currently displayed screen.
This is a so-called NOP (no operation) mode, and subcode data R, S, T, U, V, and W of a disc on which color graphics image data is not recorded are all in this ZERO mode.

Here, the audio combo I as described above is used.
・According to the standard for displaying color graphics images using disc subcode data R-W, T
In the V graphics mode, a white font command and a white font command are used as drawing commands to write sequentially reproduced font data to an image display memory called video RAM (random access memory). There is an exclusive-or-font instruction that performs an exclusive-OR operation between the font data currently available and the font data reproduced from the disk, and writes the result back into the video RAM.

Each of these extraction commands is assigned 16 types of channel numbers CHO to CH2S each consisting of 4 bits, and each channel number CHO to CH15 is, for example, CHO...English lyrics CH1... Pictures (flowers, etc.) CH2...Japanese translation CH3...Japanese lyrics CH4...French interpretation CH5...Sheet music CH6...Dance steps CH7...The part sung on the English lyrics Color graphics image data is recorded on the disk so as to correspond to pointer CH8...German translation CH9 to CH15...unused images.

FIG. 11 shows the actual format of one batch of color graphics image data including the above drawing command. Note that in FIG. 11, symbols 2.3 and symbols 20 to 23 are parity data Q and P, so they are omitted for simplicity.

In other words, the display screen mode of symbol 0 is “001001
J indicates the TV graphics mode, and instruction data r000110J of symbol 1 indicates a white font command. Also, symbol 4.
The 4 bits consisting of subcode data R and S of No. 5 are a portion in which code data specifying the channel number CHO-CH15 is recorded.

Further, data rcOLOROJ of subcode data T to W of symbol 4 indicates the background color of the display screen, and data "CoLORl" of subcode data T to W of symbol 5 indicates the front color of the display screen. ing. Also, subcode data S of symbol 6
-W data rROWJ is the vertical address (1 to
16) and the data of symbol 7 rcOLLIMNJ
indicates a horizontal address (1 to 48). Note that symbols 8 to 19 are portions in which data corresponding to one font is recorded, as described above.

For this reason, it is necessary to enable the user to appropriately select and set the image display of desired channel numbers CHO to CH15 when playing back the disc. In other words, for example, when playing a disc to which channel numbers CHO to CH3 are attached to oil level commands, it is possible to specify in advance to the playback device that only the oil level command with channel number CHO is valid. If possible, the image displayed on the screen will be a collection of only the oil level commands to which channel number CHO was added during recording, and the oil level commands with channel numbers CHI to CH3 recorded on the same disk will be ignored. can do.

Here, according to the compact disc standard that displays color graphics images using subcode data R to W as described above, for example, images corresponding to channels CHO and CHl may be displayed simultaneously on the same screen. , channel CHO.

All channel numbers CHO-C), such as displaying images corresponding to CH2 and CH3 simultaneously on the same screen, etc.
It is said that it is necessary to be able to indicate whether the oil level command is valid or invalid for all combinations of -115.

Note that, especially in playback devices that do not have a channel number selection function, the channel number CHO is forced.

The standard is to select CHl.

Therefore, for multiple channel numbers added to white font commands, exclusive-or-font commands, etc., it has been possible to enable or disable the oil level command independently for each channel number, and freely. It is desired to develop a disc playback device that has a function that allows selection and setting.

(Problems to be Solved by the Invention) As described above, there is a demand for a disc playback device that can independently select and set the oil level command to be valid or invalid for each of a plurality of channel numbers. There is a strong desire to facilitate handling by displaying numbers in an organic and easily recognizable manner.

Therefore, the present invention has been made based on the above circumstances, and it is possible to easily select and set the image display of a desired channel number, and also to facilitate handling by displaying the selected channel number in an easy-to-recognize manner. It is an object of the present invention to provide an extremely good disc playback device that does the following.

[Configuration of the Invention (Means for Solving Problems) That is, the disc playback device according to the present invention includes a storage means having a plurality of storage areas corresponding to the number of channel numbers, and each storage area of this storage means. and discriminating means for validating the channel number corresponding to the area where the first data is stored and disabling the channel number corresponding to the area where the second data is stored, and the discriminating means validates the channel number corresponding to the area where the second data is stored. A disc playback device configured to display an image corresponding to a channel number on a screen includes a counting means for performing a circulation coefficient operation up to a predetermined value in response to the number of times a first key is operated; a setting means for reversing the contents of a storage area of the storage means corresponding to the count value of the counting means in an operating state, and a setting means for inverting the contents of the storage area of the storage means corresponding to the count value of the counting means, depending on whether the contents of the storage area inverted by the setting means are first data or second data. The apparatus further includes display means for displaying the counting results of the counting means in different formats.

(Function) According to the above configuration, the first key and the second
A plurality of channel numbers can be set and canceled using only the keys, and the setting operation can be simplified. Furthermore, since the set and unset channel numbers are displayed in different formats, the selected and set channel numbers can be displayed in an easy-to-recognize manner and can be handled easily.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing the overall configuration of a disc reproducing apparatus that displays color graphics using subcode data R to W recorded on a compact disc. This disc reproducing device includes an audio reproducing section A for reproducing audio data components of the data recorded on the disc 11, and subcode data R-1 recorded on the disc 11.
It is comprised of a subcode decoder section B for signal processing W and displaying a color graphics image.

First, the audio playback section A includes a disk motor 12, an optical pickup 13, a servo circuit 14, a microprocessor 15, a demodulation circuit 16, and a subcode Q detection circuit 1.
1, D/A (digital/analog) conversion circuit 18, audio amplifier 19, speaker 2G, subcode R to W
It consists of a detection circuit 21 and a key switch group 22.

When the playback key of the key switch group 22 is operated, the microprocessor 15 controls the disk motor 12, the optical pickup 13, and the servo circuit 14, and the data recorded on the disk 11 is transferred to the optical pickup 13. will be read by.

The data read by this optical pickup 13 is
The demodulation circuit 16 performs waveform type and EFM (Eight to Fourteen Modulation) demodulation, and separates the signal into audio digital data and a synchronization signal including subcode data.

Of these, the synchronization signal is supplied to a subcode Q detection circuit 17 and a subcode R-W detection circuit 21, respectively, and subcode data Q and subcode data RSW are detected. The subcode data Q is then supplied to the microprocessor-15 for i
ll 111, and the subcode data R to W are supplied to the subcode decoder section 8 and used for image display as described later.

Further, the audio digital data is converted into an audio analog signal by the D/A conversion circuit 18,
The signal is supplied to a speaker 20 via an audio amplifier 19.

On the other hand, the subcode decoder section B includes an error correction circuit 23, a microprocessor 24, a main memory 25, a key switch input port 26, and a channel number CHO-CH1.
5, a memory control circuit 28, an image memory 29, a color lookup table 30, a D/A conversion circuit 31, a color CRT display 32, and a system path line 33.

The subcode data R-W detected by the subcode R-W detection circuit 21 is subjected to dinterleave processing, error correction processing, etc. by the error correction circuit 23, and then is sent to the system path line 33. A microprocessor 24 is supplied to the microprocessor 24 via the microprocessor 24. When this microprocessor-24 is supplied with the error-corrected subcode data R-W, it transfers the image data component and command data component of the data to the system path line 33.
The signal is supplied to the memory control circuit 28 via.

Here, the memory control circuit 28 includes a memory address generation circuit 28a, a memory read/write timing generation circuit 2
8b, video timing generation circuit 280 and parallel
It has a built-in serial conversion circuit 28d, etc., and writes the image data to a predetermined address of the image memory 29 according to the contents of the instruction data component, and reads out the image data stored in the image memory 29 and converts it every 4 bits. It is output to the color lookup table 30 as serial data (color code).

This color look-up table 30 is made up of a high-speed memory, and the color code can be rewritten under the control of the microprocessor 24. Then, the memory control circuit 28
The 4-bit color code output from the
Each bit is converted into a total of 12 bits of data.

As is well known, the above R, G, and B mean the three primary colors of light, red, green, and blue, and the values expressed by each 4 bits represent the luminescence intensity of the three primary colors at the pixel. It is what it represents.

Then, R from the above color lookup table 30
, G, B each of 4 bits output data is sent to the D/A conversion circuit 3.
1 is converted into a voltage level, and the electron gun of the color CRT display 32 is controlled. Further, the memory control circuit 28 generates horizontal and vertical synchronization signals necessary for the color CRT display 32 to display an image, so that a color graphics image can be displayed.

Here, the main memory 25 includes the microprocessor-2.
The controller 4 includes a ROM (read only memory) 25a in which a program for performing a series of control operations as described above is stored, and a RAM (random access memory) 25b. And the above RAM 2
5b contains 8 bits x 2 bytes as shown in Figure 2.
A 16-bit 7-lag register and a 5-lag register as shown in Figure 3.
A bit count register is formed.

Further, the key switch group 27 includes an up key 27a and a select key 27b.

The contents of the count register are incremented by 1 each time the up key 27a is operated. Note that the count register is configured such that when each bit n4 to no becomes rloooolJ, that is, counts up to "17" in decimal notation, it is returned to rooooooJ. In other words, the count register is 10 ways from "0" to
A cyclic counting operation is performed in the range up to "17".

The count value of the count register is displayed as channel number CHO-CH15 on the screen of the color CRT display 32 at the bottom of the screen area 32a, as shown in FIG. 4(a). In addition, the fourth
Figure (a) shows a state in which the channel number CH1 is displayed (that is, a state in which the count value of the count register is "1" in decimal).

Here, the count value of the count register is "16" in decimal.
”, the channel number display on the color CRT display 32 is erased, and when it becomes “17”, it is returned to “0” and the channel number CHO is displayed on the color CRT display 32.
will now be displayed. For this reason, color CR
Channel numbers CHO to CH1 by T display 32
5 is displayed every time the up key 27a is operated.
-CH15, display turned off, CHO-CH3S, display turned off in this order.

Note that the channel number CHO-CH15 may be displayed on the color CRT display 32 at the bottom of the border area 32b formed around the screen area 32a, as shown in FIG. 4(b). It is something.

On the other hand, each bit FO to Ff of the flag register corresponds to channel numbers Cl-1o to CH15, respectively. For example, if bit FO of the flag register is 1, the extraction command of channel CHO is valid. , the bit F
When O is 401'', it indicates that the extraction instruction of channel CHO is invalid.Then, the microprocessor 24 inputs each bit FO of the flag register.
Look at the value of ~Ff and select which channel number CHO~CH15
It is determined whether to enable or disable the extraction command.

Here, when the select key 27b is operated, the count value of the count register at that time, that is, the channel number CHO displayed on the color CRT display 32
Bits FO to Ff of the flag register corresponding to CH15
The content of is now reversed. That is, for example, if the count value of the count register is "3" in 10 channels, the color CRT display 32 shows the channel number CH.
3 is displayed, if you operate the select key 27b, the contents of bit F3 of the flag register corresponding to channel number CH3 will change to "1'' if it is 110 II.
Also, if it is "1", it is inverted to "0".

Therefore, two of the up key 27a and select key 27b are
Channel numbers CHO to CH15 using only one key.
It is possible to selectively enable and disable the 0 drawing command.

Then, the count value of the count register, that is, the channel number CH selected by the operation of the up key 27a.
Bit l of the flag register corresponding to O~CH15
Channel numbers CHO to CH displayed on the color CRT display 32 depending on whether 0-Ff is “0” or “1”
The display format of 15 has been changed.

For example, when the count value of the count register is "3" in decimal and channel number CH3 is displayed on the color CRT display 32, channel number C
If bit F3 of the flag register corresponding to H3 is “0”, that is, if the oil level command of the channel number C [(3) is invalid, the rC
H3J is displayed blinking.

Also, the channel number @C is displayed on the color CRT display 32.
While H3 is displayed, channel number CH
If bit F3 of the flag register corresponding to Cl-13 is 1'', that is, if the oil level command of that channel number Cl-13 is valid, rC is displayed on the color CRT display 32.
H3J is displayed by lighting up.

Therefore, depending on whether the channel numbers Cl-1o to C)-115 on the color CRT display 32 are displayed in a blinking state or a lit state, the channel numbers CHO-CH
The user can easily identify whether the oil level command No. 15 is invalid or valid, that is, whether it is in the setting state or not.

Here, FIGS. 5 and 6 are flowcharts summarizing the main parts of a series of operations executed by the microprocessor 24, respectively.

First, FIG. 5 shows that after the microprocessor 24 receives subcode data R-W from the error correction circuit 23,
This shows the operation of executing a picture command.

That is, playback of the disc 11 starts (step 81).
If so, the microprocessor-24 performs step S2.
and memory III m circuit 28. Initialization processing is performed on the color lookup table 30 and other circuits forming the subcode decoder section B.

Next, in step S3, the microprocessor-24
Both bits FO and F1 of the flag register are set to "1", and all other bits F2 to Ff are set to 0'°. In other words, the oil level commands of channel numbers CHO and CH1 are set to be valid. In this state, the microprocessor 24 determines in step $4 whether or not the oil level command has been output from the error correction circuit 23. Then, if the oil level command is not outputted (No>), the microprocessor 24 continues the determination operation, and if the oil level command is outputted (YES), the microprocessor 24 proceeds to step S5. Determine whether or not is a white font command.

If the command is a white font command (YES), the microprocessor 24 reads the channel number from one batch of color graphics image data including the command in step S6. Also, if it is not a white font instruction (No), microprocessor-2
4, in step S7, it is determined whether the input oil level command is an exclusive or font command.

If the command is an exclusive-or-font command (YES), the microprocessor 24 reads the channel number from one batch of color graphics image data that includes the command in step S6. Also, if it is not an exclusive or font command (N
o) In step S8, the microprocessor 24 determines that the input data is an image manipulation command, such as a scroll screen command or a color lookup table change command, and performs the necessary processing for those commands. Return to step S4.

On the other hand, the channel number read in step S6 is read by the microprocessor 24, and in step S9 bit Fn of the flag register corresponding to the channel number is set to "
It is determined whether or not it is 1'. Then, the microprocessor 24 selects pins 1 to Fn of the flag register.
If the bit FO of the flag register is not 1'° (No), the process returns to step S4, and if the bit FO of the flag register is "1" (YES), then in step 310, a white font instruction or exclusive-or-font The process necessary for the command is performed and the process returns to step S4.

Next, FIG. 6 shows the operation of operating the key switch group 27 to set predetermined bits FO to F of the flag register to 0 or 1. That is, the state of the flag register is not changed in the main program shown in FIG. 5, but is done in response to a vertical blanking interrupt of the color CRT display 32.

In other words, from the memory control circuit 28, the color CRT
An interrupt signal synchronized with the start of the vertical retrace period of the display 32 is generated to the microprocessor 24, and the generation interval is as follows in the case of the NTSC standard system.
60 times per second.

Then, the vertical blanking interrupt starts (step 5
11) Then, the microprocessor 24 executes a necessary interrupt processing operation for the subcode decoder section B in step S12. Thereafter, the microprocessor 24 scans the up key 27a via the key switch input port 26 in step S13,
It is determined whether the up key 27a is being operated.

Here, the microprocessor-24 selects the up key 27.
If a is operated (YES), in step 314,
It is determined whether the up key 27a was operated during the blanking interrupt immediately before the current blanking interrupt, that is, whether the amplifier key 27a was operated continuously.

The microprocessor 24 then activates the up key 27.
If it is a continuous operation of a (YES), return to the main program (step 515), and if it is not a continuous operation (N
o) In step 816, the contents of the count register n
Add +1 to Thereafter, the microprocessor 24 determines whether the content n of the count register is "16" in step S17, and if it is "16" (YES),
In step S18, the display of channel number CHO-CH15 on the color CRT display 32 is erased as described above, and the process returns to the main program (step 515).
.

Also, if it is not “16” in step S17 (No>
, the microprocessor-24 determines in step 319 whether the content n of the count register is "17". And the microprocessor-24 is "17"
Otherwise (No>, in step S20, the count value of the count register is displayed on the color OR display 32 as channel numbers CHO to CH15, and if it is "11" (YES), the content n of the counter register is displayed in step S21. channel number CH in step S20.
Display O.

Thereafter, microprocessor 24 performs step 322
Then, it is determined whether the bit l"n of the flag register corresponding to the displayed channel number @C1-to-CH15 is set to 1". And microprocessor-2
4 is “1” (YES>, step 82
3, the channel number @ on the color CRT display 32
The CHO-CH15 is turned on and the process returns to the main program (step 515). If the microprocessor 24 is not "1"(No>, the microprocessor 24 flashes the channel numbers @CHO to CH15 on the color CRT display 32 in step S24, and returns to the main program (step 515). ).

Here, in step 313, if the up key 27a is not operated (No>, the microprocessor-2
4, in step 825, the key switch input port 26
The select key 27b is scanned via the select key 27b to determine whether the select key 27b is being operated.

The microprocessor 24 then selects the select key 2.
If 7b is not operated (No), return to the main program (step 515), and press select key 27b.
If has been operated (YES), in step 826,
It is determined whether the select key 27b was operated during the blanking interrupt immediately before the current blanking interrupt, that is, whether the select key 27b was operated continuously.

In this case, if the operation is continuous (YES), the microprocessor 24 returns to the main program (step S15); if it is not a continuous operation (No), the microprocessor 24 returns to step 3.
At step 27, it is determined whether the content n of the count register is "1G". Then, if n is "16" (YES), that is, if the channel number display is to be erased, the microprocessor 24 returns to the main program (step 515) and determines that n must be "16". If (No), in step 328, bit Fn of the flag register corresponding to the count value of the count register is inverted.

Therefore, according to the configuration of the above embodiment, by operating the up key 27a, the channel number CHO
By selecting CH15 and operating the select key 27b, the pit Fn of the flag register corresponding to the selected channel number CHO to CH15 is inverted. It is possible to select and set whether the channel number extraction command is valid or invalid.

In addition, the channel number for which the extraction command is valid is color C.
The channel numbers that are lit on the RT display 32 and for which the drawing command is invalid are displayed on the color CRT display 3.
2, the setting state of the channel number can be easily identified and handling can be facilitated.

Here, in the above embodiment, the channel number is
Although the channel number is displayed on the display 32, for example, the subcode decoder section B of the disc playback device may be provided with a channel number display section.In other words, the location where the channel number display section is provided is not specified at all. Of course, it is not a thing.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and can be implemented with various modifications without departing from the gist thereof.

[Effects of the Invention] Therefore, as described in detail above, according to the present invention, it is possible to easily select and set the image display of a desired channel number, and in particular, the selected channel number can be displayed in an easy-to-recognize manner. Therefore, it is possible to provide an overall excellent disc playback device that is easy to handle.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of disk playback@snow according to the present invention, and FIG.
3 and 3 are respectively explanatory diagrams of the flag register and count register of the same embodiment, FIG. 4 is a front view showing the display state of the channel number of the same embodiment, and FIGS. 5 and 6 are respectively the same embodiment. 7 is a diagram to explain the format of one back of color graphics image data, FIG. 8 is a diagram to explain one font image area, and FIG. 10th
The figures are diagrams for explaining one screen in the TV graphics mode and the LINE graphics mode, respectively, and FIG. 11 is a diagram for explaining the drawing command part in one pack of color graphics image data. 11... Disc, 12... Disc motor, 13
...Optical pickup, 14...Servo circuit, 1
5...Microprocessor-116...Demodulation circuit,
17... Subcode Q detection circuit, 18... D/A conversion circuit, 19... Audio amplifier, 20... Speaker, 21... Subcode R-W detection circuit, 22...
・Key switch group, 23...Error correction circuit, 24・
...Microprocessor-125...Main memory, 26
...Key switch input port, 27...Key switch group, 28...Memory control circuit, 29...Image memory, 30...Color lookup table, 31...
- D/A conversion circuit, 32... Color CRT display, 33... System pass line. Applicant's agent Patent attorney Takehiko Suzue Figure 3 (a) (b) Figure 4 Figure 8 Figure 10

Claims (1)

[Claims] This device plays back a disc on which an audio signal, an image signal, and its image manipulation instructions are digitized and recorded, and has a plurality of storage areas corresponding to the number of channel numbers added to the extraction instructions in the image signal. and a determination as to whether the channel number corresponding to the area where the first data is stored is valid and the channel number corresponding to the area where the second data is stored is invalid among the storage areas of the storage means. in a disc playback device comprising: means for displaying on the screen an image corresponding to the channel number determined to be valid by the determining means; a counting means for performing a coefficient operation; a setting means for inverting the contents of the storage area of the storage means corresponding to the count value of the counting means in the operating state of a second key; and the storage area inverted by the setting means. 2. A disc playback device comprising: display means for displaying the counting results of the counting means in different formats depending on whether the content is the first data or the second data.