JPS6180693A - Digital disk record reproducing device - Google Patents

Abstract

PURPOSE:To discriminate whether or not picture data, which can be displayed, is recorded and to display suitably in accordance with the recording/non- recording by being equipped with a count means which counts a continuous receiving circuit of non-picture display data, and a judging means which sends the data stored in a memory means to a data processing means. CONSTITUTION:For picture data in which reproduced data is not effective, namely, the data of a ZERO mode, first the value of a non-picture display data counting counter written in RAM 119 is read, the value is increased (+1), and written in RAM 119 again. Namely, the value of the counter counts how many times picture data of a ZERO mode are reproduced after disk reproduction is executed. Next, the value of the non-picture display data counting counter written in RAM 119 is read, it is judged whether or not it is the value or above which is set beforehand, and when the conditions are approved, it is judged whether or not a picture data reproducing flag written in RAM 119 is clear. Be the above-mentioned procedure, the values of the counter and the flag are changed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a digital disc record playback device of, for example, a CD (optical compact disc) system, which records image data together with audio data.

In particular, it relates to the image display system.

[Technical background of the invention]

Currently, some audio equipment employs a digital recording and reproducing method that makes full use of PCM technology in order to achieve a high fidelity reproduction ratio and excellent operability. Therefore, to explain this using the CD system as an example, this is a disk made by coating a transparent resin disk with a diameter of 12 m with a metal thin film that forms bits (irregularities with different reflectances) corresponding to digital PCM data. is rotationally driven using a CLV (constant linear velocity) method, and is reproduced in a linear tracking method from the inner circumferential side to the outer circumferential side by an optical pickup containing a semiconductor laser and an optical conversion element. Here, the above-mentioned disk contains sub-code data for improving operability and realizing advanced functions along with the audio data to be reproduced.Then, this sub-code data is stored in each sub-code P for each frame. , subcode Q
, subcode R to subcode W. Of these, subcode Q is called address data, and in the program area of the disc (radius 5 to 58!Ill), each recorded song number (TNO), section number (INDEX), and elapsed time ( 'rIME), etc. In the lead-in area (range from radius to δ) located on the inner circumference of the song, the start address of each track number is indicated as TOC (daple of contents) data. It has become. In other words, this subcode Q is recorded so that a search operation for selectively reproducing desired data to be reproduced from the vast amount of recorded information recorded on the disc can be performed quickly and accurately. At the same time, it is also used as display data. Further, the subcode P is a simplified version of the subcode Q, and is data that simply shows only the change points of each subcode, and is used in a simple playback device that does not have an advanced search function.

On the other hand, sub-coding W consisting of 6 bits per frame is not used on existing discs that only record audio data for playback, and has recently been used as image display data. In other words, this subcode data is intended to display pixels on, for example, a TV screen in synchronization with audio data.
Its specific structure and usage are currently considered as follows.

Toe 9. The above image data is roughly divided into display image data in units called packs or image manipulation commands such as scrolling the screen, and each data is composed of 144 (=24× 6 ) bits as shown in Figure LC5. Here, symbol O is mode/item data and specifies a display screen mode as described later. Further, symbol 1 is the above-mentioned image display data and instrafushicon data indicating the type of image manipulation command, and 7/pols 4 to 19 are data for each command. And symbol 2.3
and KA~DA are parity data generated by the Reed-Solomon code, and the playback device uses this to perform error determination and error correction.

Here, the above display screen a[r mode designated by symbol O includes TV (television graphics) mode, LINE
There are three types: (line graphic) mode and ZERO mode. Therefore, TV mode is shown in Figure 6 (a).
) As shown in Figure 6(b), this mode assumes a display device such as a CR or T display in which one screen consists of 288 x 192 dots of pixels, and the LINE mode is a mode in which the Vc1 screen consists of 288 x 24 dots as shown in Figure 6(b). This mode assumes a simple display device, such as a liquid crystal display, which is composed of pixels. These screens are subdivided into areas each having 6 x 12 dots called font as shown in Figure 6 (tc), and TV%-)'' is 48 x 167 t.
y), LINE-v--)Tt48x2 font 1
The screen is configured. Note that the above-mentioned display image data for each pack is data corresponding to this one font,
Data area of symbols 8 to 19 (6X
12 pits) stores data for each pixel in the font.

Therefore, for example, when displaying in TV mode, it is necessary to record K 768 (=48×16') packs of data on a disk to constitute one screen. Also, one batch of data is recorded at a cycle of approximately 3 msec, and it takes 2.2SeC (768 x 3 msec) to display one screen.
5 ec) is required. In addition, when in TV mode, it is possible to create subtle expressions such as neutral colors and complex color changes using a pre-selected 16-color palette, making it possible to display vivid images. Similar to KL
In INE mode, images can be displayed in 8 colors. Also, among the above display screen modes, ZER, 0 mode is N0P (No 0pera) that does not affect the screen being displayed.
tion) -e: -)' There is te! , Tejlj
flt - Subcode R, S-W of disc that does not fit
All ZERO mode data will be recorded on the disc, just like on existing discs.

On the other hand, the pack data in the TV mode or LINE mode includes image manipulation commands other than the display image data, as described above, and the type of the command is indicated by symbol 1 infrastructural data. Here, the above image manipulation command includes a scroll command for the entire screen (command to move the entire screen horizontally or vertically), a scroll command for only a specific row or column, or a preset screen command to fill the entire screen with one color. By combining these, it is possible to construct a visually varied and effective screen.

[Problems with dorsal plasma technology]

However, digital disc record playback devices for discs containing such image data require advanced technology not found in conventional models in order to display accurate images from subcode data and to freely control the screen. It is necessary to have a single-picture display function, and the control system must be particularly improved.For example, the subcodes R to W of discs currently on the market all have Z[LO Even for discs that cannot display images because they contain data, not all discs contain image data that can be displayed. Therefore, when playing these discs, a display is displayed to inform you that no image data that can be displayed is recorded, or a predetermined display is displayed instead in order to make effective use of the display for displaying images. It is desired that the device has a function.

[Purpose of the invention]

The present invention has been made in response to the above-mentioned technical requirements, and after starting playback of a disc, it is determined whether displayable image data is recorded on the disc, and the system determines whether displayable image data is recorded or not. SUMMARY OF THE INVENTION As shown in FIG. a reproducing means for reading each of the above-mentioned data from the disc recorded on the disc, a double f-image data detecting means for detecting the data read out by the reproducing means, image r and t data, and display data according to the image data. a data processing means for processing data to be generated; and a data processing means for processing data to be generated;
ii! is saved by the display data supplying means and the one-stroke r1 data detection means! ii non-image display data discriminating means for discriminating overlapping and one-image display data from image data; a reproducing operation start detecting means for detecting that a reproducing operation has been started by the reproducing means; and a reproducing operation start detecting means by the reproducing operation start detecting means. a counting means for counting the number of consecutive receptions of the non-image display data when the start is detected; a storage means for storing predetermined image data not recorded on the disk; and a count value of the counting means is set in advance. [Embodiment of the invention] DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a CD-type digital disc record playback device to which the present invention is applied will be described with reference to the drawings.

First, FIG. 2 shows a schematic electrical circuit system of the digital disc record reproducing apparatus in this embodiment.

In the figure, a control circuit (101) includes a microcomputer and an interface circuit, and by selectively operating keys of a key switch group (102),
According to the program stored in the ROM (103),
Controls the disc playback system (104) to a predetermined state, and also controls the display section (105) and CRT display (104).
06) The disc playback system (104) is connected to a control circuit (101) that displays various types of information as will be described later.
), the disk motor (108) and pickup feed motor (
109) is driven and the laser diode of the pickup (110) is turned on, the data recorded on the disk (111) is reproduced by the big earp (110), and the reproduced signal is sent to the RF signal detection circuit (112). Send. This RF signal detection circuit (112) detects the detected RF
Double signal servo circuit (113) Separates into K supply signal and gFM signal supplied to demodulation circuit (114).Here, servo circuit (113) applies focus servo and tracking servo to pickup (110). At the same time, the disc playback system control circuit (107) is also sent to the pickup feed motor (109).
) together with the control signal from the controller sends out a signal that controls the linear tracking servo. In addition, the demodulation circuit (4
1:() t5 E FM Waveform shaping and EFM of M signal
It demodulates, separates the synchronization signal that becomes subcode data, and sends the synchronization signal to the subcode Q detection circuit (115
) and subcode R, W detection circuit (116), and the signal from which the synchronization signal has been separated is supplied to the D/A conversion circuit (116).
117). Then, the D/A conversion circuit (1
17) The reproduced signal returned to an analog signal undergoes necessary error correction.

The speaker (118
) is used to drive the sound. Furthermore, if the subcode Q detected by the subcode detection circuit (115) is TOC data in the lead-in area, the subcode Q detected by the subcode detection circuit (115) is transmitted to the control circuit (101).
It is taken into RAM (119) via
It is used to perform necessary control functions such as search functions, and if it is the address data of the program area,
A display unit (105) is provided from a control circuit (101) via a display output control circuit (120) to display necessary information such as KTNO or TIME.

On the other hand, the image data of the subcode R-W detected by the subcode R,W detection circuit (116) is transmitted to the control circuit (101).
) and the video ram control circuit (121) to a predetermined address in the graphic video ram (122). Nashi, this graphic video ram (122)
In consideration of various display screen modes, a pipe having a capacity of 192 to 256 is used. Further, the image display ROM (123) stores data for a predetermined image pattern, and the control circuit (101) can transfer the data to the graphic video RAM (122) via the video RAM control circuit (121). Then, the TV double signal generation circuit Cl24 reads out the image data in the graphic video column (122), adds signals such as a vertical synchronization signal, a horizontal synchronization signal, etc., and then outputs it to the TV.
Generates a screen display signal and sends it to a CRT display (
106). Here, the control circuit (101) reads the image data in the graphic video ram (122) by supplying a predetermined control signal to the video ram control circuit (121), and reads the image data on the CRT display (106).
) It is possible to freely control the image above.Next, we will explain the control function that is a feature of this embodiment based on the above configuration.0 As mentioned above, when playing the disc (111) ,
Image data that can be displayed on that disc, that is, ZIJO
Determine whether image data other than the mode is recorded,
If it is not recorded, it is desirable to display it appropriately. Therefore, in this implementation, if it is detected that displayable image data is not recorded,
A predetermined image display is executed using image data prepared in advance, and the operation is performed by a control circuit (1
It is automatically controlled by the microcomputer in 01).

Here, in order to drive the above microcomputer, R
OM (103) K A flowchart of the written display mode switching execution program is shown in FIG. 3, and will be hereinafter referred to as KG.

First, it is recognized whether the disc is currently being played (playing) or not. The digital disc playback device shown in FIG. 2 is operated by the user selectively operating a group of key switches (102) to perform functions such as performance and cueing of each side. The operating state is controlled by a micro combinator in the control circuit (101), and by monitoring the operation status of each key, it is easy to determine whether the sand is being regenerated or not. be. however,
Since the CD image display is a new function, the control circuit (
101) may be divided into a disc reproduction control circuit (conventional control circuit) and a control circuit dedicated to CD1ilj display processing. In such a system, since the operation control of the playback system (104) is executed by the former control circuit, a signal indicating the disc playback/non-playback state is transmitted to the latter control circuit through the signal line, and the control circuit in this step is Judgment is made based on the signal (step ■). Then, if the disc is not being played, ia! If detected, reset the value of the non-image display data counter written in %RAM (119) Kt (set the value to O),
Furthermore, the image data reproduction flag is cleared (value is set to 0). (Step ■) Furthermore, a screen display indicating that the disc is in a non-playback state is performed, but the explanation thereof will be omitted here. Note that this process is similar to the steps from ■ to ■ shown below.
It executes a process of displaying an image pattern (this image pattern may be different) written in advance in the image display ROM (123). (Step ■) Also, if you recognize that the disc is being played,
It reads the subcodes R to W reproduced from the disc (111L5-) through the subcode R, -W detection circuit (1!6) and recognizes what kind of data it is. (Step ■) Newly When the data is reproduced, it is determined whether the data is valid image data.
Diii image display mode) "Kha, TV mode/
LIN): There are three types: i-mode/ZER and O-mode, and the modes are designated by mode/item data, which is the first symbol data in FIG. The judgment in this step is based on this mode/item data, and the mode is TV screen display mode or L
When the image data is in the INE screen display mode, it is determined that the image data is valid. (Step ■) Then, if the reproduced data is valid image data, set the image data reproduction flag and press R, AM (
119). That is, this flag is set when valid image data is reproduced t after the start of disc reproduction. Also, in this step, image display processing is performed in accordance with the reproduced data. For example, when a command to write a font on one screen is reproduced, the image data is written to the graphic video ram (122) using the video ram control circuit (121). (Step ■) On the other hand, if the reproduced data is invalid image data, that is, ZERO mode data,
Perform the following processing. First, the value of the non-image display data counter written in RAM (119) is read out, the value is increased (+1), and RAM (119) is read out again.
19), that is, the value of this counter counts how many times the ZERO mode image data has been reproduced after the disc has been reproduced.

(Step ■) Next, the value of the non-image display data counter written in the upper Qa RAM (119) is read, and it is set to the preset value (for example, if it is set to 300, it will take about 9 seconds). (which will result in the detection of a non-display state). If this condition is satisfied, it is determined whether the image data reproduction flag written in RAM (119) is in a clear state. According to the above procedure, the values of the counter and the flag change, so both of the above two conditions are satisfied only when the zgnD mode data is continuously reproduced a predetermined number of times or more after the start of disk reproduction. Therefore, in this case, the following steps are executed (step ■): First, the image display ROM is
The data read address supplied to the graphic video RAM (123) and the data write address supplied to the graphic video RAM (122) are reset to perform an initialization operation. (Step ■) Then, data corresponding to the set read address is read from the image display R, OM (123) in which predetermined data is written in advance, and the data is roughly written to correspond to the set write address. Writing is performed in the graphic video ram (122) using the video ram control circuit (121). (step, [phase]
) Then, the read/write address is incremented and set to the address to be processed next. However, reading and writing are carried out in a one-to-one correspondence, and the process of step [phase] described above is repeated *b until all data is read from the image display ROM (123). (Step ◎) In other words, by following the above steps, the number of times ZERO mode data is detected consecutively after the start of disc playback is counted, and if the counted value exceeds the set value, the image can be displayed. It is determined that the animal does not have image data recorded, and a predetermined image pattern (prepared in advance) is displayed.

Therefore, in this embodiment, by counting the number of consecutive receptions of ZERO mode data, it is possible to easily and automatically determine whether displayable image data is recorded or not. It is conceivable that discs to be produced in the future will have the above distinction specified on their level, but this cannot be distinguished with existing discs, and moreover, if multiple discs are set in a playback device such as a commercial karaoke playback device, It is difficult to check the distinction from the label on discs, so it is effective to automatically distinguish when playing the disc. Furthermore, when a disc that does not contain display image data is played back, the fact that one image is not displayed can be mistakenly recognized as a result of the on-screen display informing the user of the status of the disc, i.e., what kind of disc it is. can be avoided, which in turn leads to improved reliability.

Also, ZE 几0 mode data is recorded in all the jump codes B to WK of discs that do not contain single image display data, but ZEIL is also recorded on discs that contain image display data.
A large amount of O mode data may be recorded, and zE
Even if general 0-e-code data is reproduced, the disc is a disc that does not record image display data. ! : I can't say that. To explain these discs using diagram M4, image data was recorded with the intention of composing a single image at the beginning of each confession (Figure 4(b) #i and retaining it until the end of the song). It shows a disc, and a large number of ZFiRO mode data are consecutively recorded after the image data constituting the image. Therefore, if we look only at this part, 2
It is indistinguishable from the disc shown in FIG. 4(a) that does not contain image display data.

Therefore, in this embodiment, assuming such a situation, the above-mentioned image data playback flag is used and the disc playback/disc playback flag is used.
It is designed to start counting the Zg and O mode data when determining rabbit playback and starting disc playback. In other words,
Since subcodes a and w display images in synchronization with a single voice signal, they are generally recorded by switching the display screen every time the song changes, so at least near the beginning of each side. It is expected that a certain amount of displayable image data will be recorded continuously. Therefore, the time to start counting ZERO mode data is set at the start of disc playback (8
When searching for the beginning of a song and playing from there, it is possible to determine whether image display data is recorded or not with a high degree of accuracy by limiting the number of times it is detected continuously. It is now possible to do so.

Furthermore, if a pattern pattern such as one in which the color of the entire m-plane changes at regular intervals is displayed as an image pattern stored in the single-image display ROM (123), the installation location (
For example, it can also create an atmosphere for a Karao-off party.

Note that in the above embodiment, when it is determined that no displayable image data is recorded, the image data prepared in advance is displayed on the display; however, the present invention is not limited to this. 105) It may be considered that a display device is provided to notify the presence or absence of image data that can be displayed in K, and the display device is controlled based on the determination up to step (2) in the above flowchart.

Furthermore, if the image display R,OM (123) of the above embodiment is made replaceable, its uses will be expanded; conversely, if a simple image display is sufficient, the image data can be stored in the ROM ( 103) may be used. In other aspects of the invention, the implementation means thereof are not limited to those described above and illustrated, and various modifications and applications are possible), allowing application of a wide range of means.

〔Effect of the invention〕

As explained above, the digital disc record playback device of the present invention determines whether displayable image data is recorded on the disc and makes an appropriate display depending on whether it is recorded or not.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the overall configuration of the present invention, FIG. 2 is a block diagram showing an electric circuit system in an embodiment of the digital disc record playback device according to the present invention, and FIG. Flowchart showing the procedure of the characteristic operation, FIG. 4 is an explanatory diagram for explaining the form of the disk related to the operation explanation of the same embodiment, and FIGS. 5 and 6 are subcodes in the technical background of the present invention. 0101 is an explanatory diagram for explaining the conceptual configuration and display screen mode of W to W;
...-control circuit, 104...disc playback system, 1
16... Subcode R to W detection circuit, 121... Video ram control circuit, 122... Graphic video ram. 123...ROM for image display. 124...TV signal generation circuit. - Agent Patent Attorney Noriyuki Chika No. 31K1 1g4 Figure (a). (b) T%1 screen subcode

Claims (1)

[Claims] Reproducing means for reading each of the above-mentioned data from a disk-shaped recording medium in which image data is digitized and recorded together with audio data, and detecting the above-mentioned image data from the data read by the reproducing means. an image data detection means, a data processing means for performing data processing to generate display data according to the image data, and a display data supply for supplying the display data generated by the data processing means to a predetermined display device. means, non-image display data determining means for determining non-image display data from the image data detected by the image data detecting means, and reproduction operation start detection means for detecting that a reproduction operation has been started by the reproduction means. , a counting means for counting the number of consecutive receptions of the non-image display data when the start of the reproduction operation is detected by the reproduction operation start detection means, and a storage means for storing predetermined image data not recorded on the disc. and determining means for determining whether the counted value of the counting means has reached a preset value and transmitting the data stored in the storage means to the data processing means when the counted value has reached the set value. A digital disc record playback device featuring: