JPS6348653A - Cd graphics adaptor - Google Patents

Abstract

PURPOSE:To increase number of displays on a CRT by providing a frequency count means for a sub code block synchronizing means and a function discriminating means separately discriminating three states, the reproduction, the eject and stop state and other state of a CD player so as to increase number of the corresponding relation between the operating state and the displayed pictures. CONSTITUTION:A system control section 16 contains the frequency count means 17 of the sub code synchronizing signal 11, the operation discriminating means 18 of the CD player 1 and a picture display control means 19. The means 17 counting the frequency of appearance of the sub code block synchronizing signal 11 and a CD player reproducing signal discriminate the operating states of the CD player 1, (a) reproducing state, (b) eject stop state and (c) other state. Further, as to each of the states (a)-(c), a picture display control means 19 attains the control of the three kinds of CRT displays, CD graphic reproduction, monochromic display and picture holding to make the displays of the of the CD player abundant.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a CD graphics adapter that extracts subcodes from a CD player and converts them into video signals.

(Prior Art) Fig. 3 shows the configuration of a conventional CD graphics adapter, in which 1 is a CD player, 2 is a CD graphics adapter, and 3 is a subcode input section, which extracts subcodes from the CD player 1. .

4 is E CC (error correcting c
ode) The decoding section performs error correction processing. 5 is a graphics decoding unit that decodes the graphics code of the subcode from the output of the FCC decoding unit 4;
It is converted into image data and stored in the frame memory 6. 7
is a CRT control unit, which is a CRT8 as a display device.
It generates synchronization signals and the like necessary for the frame memory 6 and controls the image data read out from the frame memory 6 to be displayed on the CRT 8 as a video signal. 9 is the CD in the system control section.
Controls each part of the graphics adapter 2, 10 is a CD
playback width detection means for detecting when the player 1 is in operation;
Only during reproduction, the graphics decoding section 5 and CRT control section 7 are instructed to reproduce the CD graphics.

11 is a subcode block synchronization signal (abbreviated as BL).
KC), 12 is a subcode frame synchronization signal (CLOCK for short), 13 is a subcode signal (5LIB for short)
C), 14 is the subcode extraction clock (5BCK for short)
), the respective outputs of these 11 to 14 are outputted from the CD player 1 to the CD graphics adapter 2 according to the operation timing shown in FIG. Also, 15 is C
This is a playback raw signal (PLAY) indicating that the D player 1 is playing back.

(Problem to be Solved by the Invention) Such a conventional CD graphics adapter
Since the status of player 1 can only be categorized into two types: playback and other, the CRT 8 displays only two types of display when CD player 1 is in operation: graphics playback and other cases, and information display. There was a problem that the device was insufficient.

The present invention solves the above-mentioned problems, and aims to provide a CD graphics adapter that makes it possible to increase the display of the CRT 8 in relation to the operating status of the CD player 1.

(Means for Solving the Problems) The present invention includes a function of decoding and storing a graphics code from a subcode extracted from a CD player 1, detection of the operating state of the CD player, and control processing of a display device. In a sub-code adapter for a CD player having a system control section, the system control section includes a sub-code block synchronization signal frequency counting means, and three states of the CD player: playback state, eject/stop state, and other states. Equipped with a function to determine, for each of these three states of the CD player,
The above-mentioned problems are solved by reproducing graphics, displaying a single color, and maintaining image display.

(Function) The present invention provides a means for counting the appearance frequency of a subcode block synchronization signal and a CD graphics adapter.
Using the player replay signal, it is possible to determine the operational status of the CD player: (a) playback status, (b) eject/stop status, and (c) other statuses.
), (b) and (c), the image display control means enables control of three types of CRT displays, CD graphics playback, single color display, and image retention, thereby improving the CRT display in a CD player. Display can be enriched.

(Example) Hereinafter, the present invention will be explained in detail by way of an example using the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.
Since the explanations of 1 to 8 and 11 to 15 are the same as in FIG.
In the case of the present invention, a frequency counting means 17 for the subcode block synchronization signal 11, an operation determining means 18 for the CD player 1, and an image display control means 19 are included. Note that 20 is a preset flag, 21 is an operation determination flag for the CD player 1, and 22 is an image display signal.

The present invention having such a configuration operates approximately as follows.

That is, FIG. 2 is a flowchart explaining the operation of FIG. 1, and (A) shows the operation algorithm of the frequency counting means 17 of the subcode block synchronization signal 11,
(abbreviated as Sl. The same applies to each step below), TOV is a synchronization signal that is '1' if the subcode block synchronization signal 11 does not appear for a certain period of time, which will be described later, and O''' if it appears. flag, initial state is ′
1''. Furthermore, TCNT is a timer counter value, and the initial setting is tLOIttea7+ (S3).

Sarani [BLKCK] It is the status flag of subcode block synchronization signal (BLKCK) 11, and it is Lt.
l 71 indicates the generation of a synchronization signal (S4)
, and T in S5 is the minimum frequency time of occurrence of the subcode block synchronization signal 11 in the operating state of the CD player 1 other than the eject/stop state. In S4, the status flag [BL
Check KCK, and if it is "l 11", that is, if subcode block synchronization signal 11 is generated, process 82 synchronization signal flag TOV is set to u Ou and S
Returning to the process of 3, on the other hand, if the status flag [BLKCK] is LL OII, in the first process of 85, the previous constant time T and the timer counter value TCNT are compared, and the timer counter value TCNT is set to the constant time T. In the following cases, S4
In the opposite case, the process returns to Sl. i.e. 1
The present invention first sets the synchronization signal flag TOV to "1" when the subcoat block synchronization signal 11 is not generated for a certain period of time T as shown in this flowchart.

Next, FIG. 2(B) shows the operation determination means 1 of the CD player 1.
8, and PLAY, which is a flowchart showing the operation of the image display control means 19, is an operation determination flag that generates LL OII when the CD player 1 is playing, and 1'' when the CD player 1 is not playing. Determine whether player 1 is playing. If +1111 determines that player 1 is playing, proceed to step S3.
If it is not being played and is 110 TT, then Sl
processing is performed. In this process S2, the synchronization signal flag T
Whether OV is HI II, that is, constant; T between 1 and 1
It is determined whether the subcoat block synchronization signal 11 does not occur in a longer period, and if it is "III", the process branches to process S4, and if it is "0", the process moves to process S5.

If the above judgment branches to 83, the CD player 1 is in the playback state, so play graphics.

The instructions are given to the graphics decoding section 5 and CRT control section 7 shown in FIG. In addition, when branching to S4, the CD player 1 is in eject h or stopped state,
In step S4, an instruction is given to prescent the image in the same color. Furthermore, when branching to the process of S5, the CD player] is in the playing state as described above, or to eject 1.
This is a state other than a stopped state, and the CRT control section 7 is instructed to hold the displayed image at this time.

As explained above, according to the present invention, the operating state of the CD player 1 and the display image can be displayed on the CRT in correspondence with each other.

(Effects of the Invention) As is clear from the above explanation, the present invention provides a CD player 1
Although the information sent from the CD player 1 is the same as in the conventional example, it is possible to increase the correspondence between the operating status of the CD player 1 and the displayed images, thereby increasing the number of displays on the CRT.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a flowchart 1 for explaining the operation of the device shown in FIG. 1.
FIG. 3 is a block diagram showing a conventional example, and FIG. 4 is a timing diagram explaining the device shown in FIG. 3. 1...CD player, 2...CD graphics adapter, 3...subcode input section, 4...
・ECC decoding section, 5...Graphics decoding section, 6...Frame memory, 7...C
RT control section, 8...CRT, 9...
- System control unit, 10... (CD player) playback width detection means, 11... Subcode block synchronization signal (abbreviated as BLKCK), 12... Subcode frame synchronization signal (abbreviated as CLOCK), 13
・Subcode signal (abbreviated as 5UBC), 14...Subcode extraction clock (abbreviated as 5FICK), 15...
- Playback raw signal (PLAY), 16... System control section, 17... Frequency number means (of subneed block synchronization signal), 18... Operation determination means (of CD player), 19... Image Display control means, 20...preset flag, 21...operation determination flag (of the CD player), 22...image display signal, T...certain time, TOV...synchronization signal flag, [BLKCK...
[Subcode block synchronization signal (BLKCK)
] Status flag, PLAY... operation determination flag. Patent applicant: Matsushita Denki 2:9 Sangyo Co., Ltd.

Claims (1)

[Claims] In a graphics adapter for a CD player, which has a function of decoding and storing graphics codes from subcodes extracted from the CD player, detecting the operating state of the CD player, and controlling the display device, the subcode It is equipped with means for counting the frequency of block synchronization signals, and a function for classifying and determining the three states of the CD player: playback state, eject/stop state, and other states. A CD graphics adapter that is capable of displaying and holding an image display.