JPS62229591A - Disk reproducing device - Google Patents

Abstract

PURPOSE:To recognize a selected channel number and to facilitate the handling by selecting and setting a desired number from plural channel numbers by external operation and displaying the set channel number on a picture display screen. CONSTITUTION:A sub code data R-W detected by a disk 11 is fed to a microprocessor 24 via an error correction circuit 23 and a picture data component and an instruction data component in the data are fed to a memory control circuit 28. The circuit 28 writes a picture data in a picture memory 29 in response to the content of the instruction data component, reads the storage data and displays a picture on a CRT display device 32. In selecting and setting a desired channel number by a key switch group 27, the processor 24 displays the number on the CRT32 and makes only a picture drawing command added by the channel number selected and set effective. Thus, the desired channel number is displayed with ease of recognition and the handling is facilitated.

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 sound single-channel devices, audio signals are converted into digitized data using PCM (pulse code modulation) technology in order to achieve high-density and high-fidelity recording and playback. Digital recording and reproducing systems that convert the data, record it on a recording medium such as a disk or magnetic tape, and reproduce it are now in widespread use. Among these, those that use disks as recording media are
Compact discs, which are formed by forming pit rows corresponding to digitized data on a disc with a diameter of 12 ca+, and which are read optically, are currently the mainstream.

On the other hand, a disc playback device for playing the above-mentioned Combat L-disc moves an optical pickup containing a semiconductor laser, a photoelectric conversion element, etc. from the inner circumference of the disc toward the outer circumference in a linear tracking manner. In addition, data recorded on the compact disc is read by rotating the compact disc using a constant linear velocity (CLV) method.

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 pits).
, Q, R, S, T, U.

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

Of these, the subcode data P is provided for distinguishing between songs and within a song, and for example, "1" represents an interval between songs,
“0” 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, fflT
It shows the number @ (index) and elapsed time, etc., and the lead-in area of the disc (radius 23 to 25111 m>
This is TOC (Table of Contents) data indicating the start address of the famous song.

The other 6-bit i subcode data R to W are
Currently, it is used to construct color graphics image data for displaying color graphics images, for example on the screen of a color CRT display. This color graphics image data is roughly divided into data constituting a 1-font image area, which will be described later, and image operation command data for instructing, for example, to scroll the display screen. 6
As shown in the figure, it consists of 24 6-bit symbols (this is called one buck).

Of these, symbol O is mode/item data and specifies a display screen mode, which will be described later. Further, symbol 1 does not indicate whether the data constituting the 1-font image area described above is image manipulation command data, but is instruction data. 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 symbol 2.3 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 graphic mode displays 288 pixels (horizontal) x 1921 pixels on the color CRT display screen.
92 pixels) to compose one screen of color graphics image. 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.

FIG. 7 shows the configuration of one screen in the TV graphic mode and the LINE graphic mode. That is, in any mode, the image area is subdivided into 6 pixels (horizontal) x 12 pixels (vertical) called 1 font, and in TV graphics mode it is subdivided into 48 fonts (horizontal) x 16 fonts (@direct). ) constitutes one screen, and in LINE graphic mode there are 48
One screen is composed of font (horizontal) x 2 fonts (vertical).

The above-mentioned 1-back color graphics image data corresponds to an image area of 1 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 backs x 16 backs (168 backs) of color graphics image data on the disk.

In addition, the color graphics image data of one back is
In fact, data is recorded on the disk at a cycle of approximately 3 m5 ec, so it takes 768 x 31 R3 eC = 2.3 sec to compose one screen in 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.

Roughly speaking, as mentioned above, the back of color graphics image data in the TV graphics mode and LINE graphics mode includes data for image manipulation commands in addition to data constituting a 1-font image area. There is. 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, according to the standard for displaying color graphics images using subcode data R-W of audio compact discs as described above, TV
In graphic mode, data for each font that is played sequentially is stored in video RAM (random access).
White font commands and video R
AM1%: There is an exclusive-or-font command that performs an exclusive-OR operation on the polished font data and the font data reproduced from the disk and writes the result back into the video RAM.

Each of these drawing commands is assigned 16 types of channel numbers CHO to CH15 each consisting of 4 bits, and each channel number CHO to CH15 can be, for example, CHO...English lyrics CHI...picture. (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 the pointer CH8...German translation CH9 to CH15...unused images.

FIG. 8 shows the actual format of one batch of color graphics image data including the above drawing command. In addition, in FIG. 8, symbols 2.3 and symbols 20 to 23 are parity data Q and P, so
It is omitted for simplicity.

That is, the display screen mode of symbol O roo1001
J indicates the TV graphics mode, and instruction data roo0110J of symbol 1 indicates a white font command. Also, symbol 4
, 5, the 4 bits consisting of subcode data R and S are a portion where code data specifying the channel number CHO-CH15 is recorded.

Further, data rcOLOROJ of subcode data TW of symbol 4 indicates the background color of the display screen, and data rcOLOR1J of subcode data TW of symbol 5 indicates the front color of the display screen. . Also, subcode data S of symbol 6
-, -W data rROWJ is the vertical address (
1 to 16), and the data of symbol 7 rcOLUMN
J 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.

Therefore, it is necessary to enable the user to appropriately select and set the image display of the desired channel number CHO-CH15 when playing back the disc. In other words, for example, when playing a disc with channel numbers CHO to CI- (3 attached to the drawing command), only the rain command with channel number e C+-10 is valid for the playback device in advance. If it is possible to specify this, the image displayed on the screen will be a collection of rain commands () with channel numbers CHO added at the time of recording, and will be a collection of commands with channel numbers CH1 to CH3 recorded on the same disk. You can make it ignore rain commands.

Here, according to the compact disc standard that displays color graphics images using subcode data R-W as described above, for example, images corresponding to channels CHO and CHl may be displayed simultaneously on the same screen. , for all combinations of channel numbers CHO-CH15, such as displaying images corresponding to channels CHO2'CH2 and CH3 simultaneously on the same screen.
It is said that it is necessary to be able to indicate whether a rain order is valid or invalid.

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 Cl-11.

Therefore, for multiple channel numbers that have been added to white font commands, exclusive or font commands, etc., it has been possible to enable or disable rain commands independently for each channel number. 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 enablement and disablement of rain control commands 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 select and set the image display of a desired channel number, and in particular, the selected and set channel number is displayed in an easy-to-recognize manner to facilitate handling. The purpose is to provide a good disc playback device.

[Structure of the Invention] (Means for Solving Problems) J That is, the disc playback device according to the present invention includes a setting means for selecting and setting a desired channel number from among a plurality of channel numbers by external operation; The apparatus further includes display means for displaying the channel number set by the setting means on an image display screen.

(Function) According to the above configuration, a desired channel number is selected and set by an external operation from among the plurality of channel numbers, and the channel number is displayed on the image display screen. It is possible to select and set the image display of a desired channel number, and in particular, it is possible to display the selected and set channel number in an easy-to-recognize manner to facilitate handling.

(Embodiment) Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. Fig. 2 shows a color graphics image display using subcode data R to W recorded on a compact disc. , is a block configuration diagram showing the overall configuration of a disc playback device.This disc playback device includes an audio playback section A for playing back audio data components of data recorded on a disk 11, Subcode data R- recorded in 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.
7, D, /A (digital/'analog) conversion circuit 18,
Audio amplifier 19, speaker 20. Subcode R-
It consists of a W 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 11 and a subcode R-W detection circuit 21, respectively, and subcode data Q and subcode data RW are detected. The subcode data Q is then supplied to the microprocessor 15 for controlling, for example, a search operation, and the subcode data R to 3 are supplied to the subcode decoder section B for image display, which will be described later. It is provided.

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 channel numbers CI-10 to C.
It consists of a key switch group 27 for selecting and setting H15, 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. The data is supplied to the microprocessor 24 via the microprocessor 24. When this microprocessor-24 is supplied with the error-corrected subcode data R to 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 28a1 and a memory read/write timing generation circuit 2.
8b, video timing generation circuit 280 and parallel
It has a built-in serial conversion circuit 286, 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 by υItll of the microprocessor 24. The 4-bit color code outputted from the memory control circuit 28 is then converted into R, G, . B is converted to 4 bits each, resulting in a total of 12 bits of data.

In addition, the above R. G. As is well known, B stands for red, green, and blue, which are the three primary colors of light, and the value expressed by each 4 bits represents the luminous intensity of the three primary colors applied to the pixel. It is something.

Then, R from the above color lookup table 30
．． The output data of 4 bits each of G and 8 is converted into a voltage level by a D/Agi conversion circuit 31, and an electron gun of a 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.
4 is a ROM (read-only) that stores programs for performing a series of control operations as described above.
(memory) 25a, and a RAM (random access memory) 25b. And the above R.A.M.
In 25b, a flag register of 8 bits x 2 bytes - 16 bits 1 as shown in FIG. 3 is formed.

Each bit of this flag register corresponds to channel numbers CHO to CH15, respectively. For example, if bit FO of the flag register is "1", the mailing command of channel CHO is valid, and the bit FO is 0". When , it is assumed that the channel CHO mailing command is invalid.

Therefore, when a desired channel number CHO-CH15 is selected and set by operating a predetermined key of the key switch group 27, the operation state of the key is changed to the key switch input board 2.
6 and the system path line 33 to the microprocessor-24, the microprocessor-24
is operated to set the bit of the flag register corresponding to the selected channel number CHO-CH15 to 1''.

Thereafter, the microprocessor 24 selects the selected channel number CHO based on the contents of the flag register.
~CH15 is displayed on the screen of the color CRT display 32, and the selected channel number CH
Only box delivery orders marked with O~CH15 are valid.
In other words, it operates to display an image.

Here, the channel number CHO-CH15 selected and set by the key switch group 27 is a border area formed around the screen area 32a on the screen of the color CRT display 32, as shown in FIG. 1(a). They are displayed side by side at the bottom of the figure 32b.

FIG. 1(a) shows channel numbers CHO to CH2.
This indicates that up to channel number CH is set.
The O-CH2 mail order is valid.

In this state, for example, if you operate the key switch group 27 to set channel number CH3, the channel numbers @CHO~CH3 will be displayed as shown in Figure 1(b), and the channel numbers CI-(0-CH3) will be displayed. The order to return the box shall be valid.

Here, FIGS. 4 and 5 are flowcharts summarizing the main parts of a series of operations executed by the microprocessor 24, respectively. First, FIG. 4 shows an operation in which the microprocessor 24 executes a mailing instruction after receiving subcode data R to W from the error correction circuit 23.

That is, playback of the disc 11 starts (step S1)
If so, the microprocessor-24 executes step $2
Then, the memory control circuit 28. Initialization processing is performed on the color lookup table 30 and other circuits forming the subneed decoder section B.

Next, in step S3, the microprocessor-24
Bits FO and Fl of the flag register are both set to 1'', that is, channel number CHO.

Set the CHl mailing command to be valid.

In this state, the microprocessor-24 performs step S
In step 4, it is determined whether or not a mailing command has been output from the error correction circuit 23. Then, the microprocessor 24 continues the determination operation if the box pass command is not output (No>), and if the box pass command is output (YES).
), in step S5, it is determined whether the input mailing command is a white font command.

If the command is a white font command (YES), the microprocessor 24 reads the channel number from one pack of color graphic image data that includes the command in step S6. Also, if it is not a white font instruction (No), the microprocessor-24
In step S7, it is determined whether the input mailing command is an exclusive-or-font command.

If it is an exclusive or font command (YES), the microprocessor 24 executes step S.
At step 6, the channel number is read from one pack of color graphics image data that includes the instruction. Also,
If it is not an exclusive or font command (No
), the microprocessor-24, in step S8,
It is determined that the input data is an image manipulation command, such as a scroll screen command or a color lookup table change command, and the processing necessary for those commands is performed, and the process returns to step S4.

On the other hand, the channel number read in step S6 is read by the microprocessor 24 in step S9, and the flag register corresponding to the channel number is read by the microprocessor 24.
It is determined whether or not the value is “1''. Then,
If the bit l"n of the flag register is not 1" (No), the microprocessor-24 executes step S.
Returning to step 4, if bit l"n of the flag register is "1" (YES), the process necessary for the white font instruction or exclusive-or-font instruction is performed in step 310, and the process proceeds to step S4. return.

Next, FIG. 5 shows the operation of operating the key switch group 27 to set a predetermined bit of the flag register to "1". That is, the state of the flag register is not changed in the main program shown in FIG. 4, 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, in step 312, the microprocessor-24 executes necessary interrupt processing operations for the subcode decoder section B. Thereafter, in step 813, the microprocessor 24 scans the key switch group 27 via the key switch input board 26 to determine whether a key is being operated.

Here, if the key is not operated (No>), the microprocessor 24 returns to the main program (
Step 814), if the key is operated (YES)
In step S15, it is determined whether the same key was operated during the blanking interrupt immediately before the current blanking interrupt, that is, whether the same key was operated continuously.

If the same key is operated continuously (YES), the microprocessor 24 returns to the main program (step 314); if the same key is not operated continuously (No), the microprocessor 24 returns to the main program (step 314).
In step 516, the bit l''n of the flag register corresponding to the operated key is inverted.Then, in step 317, the microprocessor-24 inverts the bit l''n of the flag register corresponding to the operated key.
It is determined whether n is "1" or not.

Here, if the bit Fn is “1” (YES>
In step 318, the microprocessor 24 causes the channel number corresponding to the bit Fn to be displayed on the border area 32b of the color CRT display 32, as shown in FIG. 1, and returns to the main program (
Step 514). If the bit Fn is not 1'' (No), the microprocessor 24, in step S19, sets the channel number corresponding to the bit Fn to
The border area 32b of the color CRT display 32 is turned off and the process returns to the main program (step 514).

Therefore, according to the configuration of the above embodiment, by operating the key switch group 27, channel numbers can be freely selected and set by external operation, and the setting status of channel numbers can be easily identified. This allows for easier handling.

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 detailed above, according to the present invention, it is possible to select and set the image display of a desired channel number, and in particular, the selected channel number is displayed in an easy-to-recognize manner to facilitate handling. Thus, it is possible to provide an extremely good disc playback device.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of a disc playback device according to the present invention, and is a front view showing the display state of selected channel numbers, and FIG. 2 is a block diagram showing the overall structure of the embodiment. 3 is an explanation of the flag register of the same embodiment, FIGS. 4 and 5 are flowcharts for explaining the operation of the same embodiment, and FIG. 6 is a flowchart for explaining the operation of one pack of color graphics image data. A diagram for explaining the format, FIG. 7, shows the TV graphic mode and [lN
FIG. 8 is a diagram for explaining one screen in the E-graphics mode. FIG. 8 is a diagram for explaining a rain control command part in one back of color graphic graphics 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 to W detection circuit, 22...
・Key switch, group, 23...Error correction circuit, 24
...Microprocessor-125...Main memory, 2
6... Key switch input board, 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 (a) (b) Figure 1 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8

Claims (1)

[Claims] This device plays back a disc on which audio signals, image signals, and image manipulation instructions are digitized and recorded, and a desired image can be displayed on the screen by selecting and setting the channel number added to the drawing instruction in the image signal. A disc playback device that displays a desired channel number from among a plurality of channel numbers by an external operation; and a display device that displays the channel number set by the setting means on the screen. A disc playback device comprising: