KR0133453Y1 - Compact disc graphic player - Google Patents

Abstract

The present invention aims to provide a CDG reproducing apparatus with a simpler hardware configuration by using a counter in the microcomputer as a substitute for the frequency divider.

To this end, the present invention determines whether there is an external video signal input and controls the external horizontal synchronization signal from the synchronization separating unit 10 to be applied to the phase comparator 30 when there is an external video signal input. In the CDG reproducing apparatus having a synchronous signal switching means 100 for controlling its own standard horizontal synchronous signal to be applied to the phase comparator 30 when there is no video signal input, the synchronous signal switching means 100 is external. As the video signal is input, the synchronization detector 100A detects synchronization of the external video signal, and the clock oscillator 100B for generating an external horizontal synchronization signal when the external video signal is not input, and the counter ( 100E) and counts a reference clock signal from the clock oscillator 100B to the counter 100E and outputs the standard synchronous horizontal signal based on the count value. The comb 100F and the switching unit 100D are switched so that the corresponding horizontal synchronizing signal is applied to the phase comparator 30 according to the presence or absence of a detection signal from the synchronization detecting unit 100A.

Description

CDG Player

1 is a block diagram of a CDG player having a general superimpose function.

2 is a block diagram of a CDG player having a superimpose function, which is an improvement of the CDG player shown in FIG.

3 (a) to 3 (d) show an example of the result of superimposing an external image signal and an internal graphic signal based on the superimpose timing signal from the CDG coder shown in FIG. drawing.

4 is a block diagram of a conventional CDG playback apparatus that solves the problem of the CDG playback apparatus shown in FIG.

5 is a main block diagram of a CDG reproducing apparatus according to the present invention.

* Explanation of symbols for main parts of the drawings

10: synchronization separator 20: CDG recorder

30: phase comparison unit 40: phase compensation value control unit

50: oscillator 60: RGB encoder

70: switching unit 80: burst gate pulse generating unit

90: synchronization signal control means 100: synchronization signal switching means

100A: synchronization detector 100B: clock oscillator

100C: Divider 100D: Switching part

100E: Counter inside the microcomputer 100F: Microcomputer

The present invention relates to a CDG reproducing apparatus, and more particularly, to a CDG reproducing apparatus with a simpler hardware configuration.

Now, with the development of 'video disc' which is a composite medium of video and audio, it has been able to create a new type of software called visual music. As the / V device was born, it became a full-fledged A / V era where video and audio coexist.

As the A / V era begins in earnest, the public's attention to pure audio culture that presupposes only auditory appreciation has shifted to the A / V culture where audio-visual coexists. As a leader of the era, it can be seen that a multi-disc player (MDP) that reads information from a disc-shaped information storage medium and reproduces a video signal and an audio signal is attracting attention.

The multi-disc player reads image information and / or audio information recorded on a disc-shaped information storage medium such as a compact disc graphic (CDG) or a laser disc (LD) to perform image signal processing and / or audio signal processing, respectively. The audio signal is output through the speaker and the video signal is displayed on the monitor.

As described above, the information storage medium employed in the multi-disc player, for example, a compact disc graphic (CDG), provides not only good sound quality but also high-quality random access due to the audio code and 8-bit sub code signal recorded on the disc. Random Access) and graphic display are available.

Here, the 8-bit subcode signal recorded on the compact disc graphic is located in the channels P, Q, R, S, T, U, V, and W. Among the P and Q channels, the random access and reproduction of the multi disc player are already performed. It is used for time display and track number display, and the remaining R to W channels are used for graphic data transmission.

As such, in general, a superimpose function is widely adopted to display graphic data on a compact disc graphic, for example, lyrics data or caption data, on a monitor together with a video signal provided from an external source such as a television.

The CDG reproducing apparatus having the superimpose function generally extracts and separates an external horizontal synchronous signal and an external vertical synchronous signal from an external video signal provided from an external video source such as a television as shown in FIG. The synchronization separator 10, a CDG decoder 20 for decoding the graphic information recorded in the subcode on the CDG disc, an external horizontal synchronization signal from the synchronization separator 10, and the CDG decoder 20 from the CDG decoder 20. A phase comparator 30 for comparing the phases of the internal horizontal synchronization signal, and an oscillator 50 for oscillating a source clock of the internal horizontal synchronization signal in order to compensate for the phase difference detected as a result of the comparison in the phase comparator 30; An RGB encoder that encodes R, G, and B color signals for graphic information applied from the CDG decoder 20 based on the composite compensation signal from the phase compensation value control unit 40 and the CDG decoder 20 to be controlled. (60) and a switching unit (70) for superimposing the external video signal and the graphic signal from the RGB encoder (60) at high speed according to the superimposition timing signal from the CDG decoder (20). do.

Referring to the operation of the CDG playback apparatus having a general superimpose function configured as described above, first, the synchronization separating unit 10 is an external horizontal synchronous signal and an external vertical synchronous signal from an external video signal provided from an external video source such as a television. Extract and isolate. Thereafter, the CRT controller (not shown) in the CDG decoder 20 is reset by the external vertical synchronization signal, and the clock signal from the oscillator 50 input to the CDG decoder 20 is divided by 910 minutes. The external horizontal synchronizing signal is applied to one end of the phase comparing unit 30 as an internal horizontal synchronizing signal, while the external horizontal synchronizing signal from the synchronizing separation unit 10 is applied to the other end of the phase comparing unit 30. Accordingly, the phase comparison unit 30 compares the phases of the external horizontal synchronization signal and the internal horizontal synchronization signal, and the phase compensation value control unit 40 compensates for the phase difference when the phase difference is detected as a result of the comparison. For example, a phase compensation value control signal capable of adjusting the time of the clock signal oscillated by the oscillator 50 is solved, and in the oscillator 50, a source clock of an internal horizontal synchronization signal is generated according to the phase compensation value control signal, for example, 14.31818. It will oscillate MHz. Accordingly, the CDG decoder 20 synthesizes the oscillation frequency and the internal vertical synchronous signal and applies it to the RGB encoder 60 as a composite synchronous signal. Thus, the RGB encoder 60 encodes R, G, and B color signals for graphic information output as a result of decoding from the CDG decoder 20. Accordingly, the switching unit 70 transfers the external video signal from the external video source and the graphic signal (internal video signal) output from the RGB encoder 60 from the output terminal A of the CDG decoder 20. Based on the imposing timing signal (Superimposing Timing) to switch at high speed to produce a single screen (image) to output.

According to the CDG reproducing apparatus having a general superimpose function operating as described above, the internal horizontal synchronizing signal and the external horizontal synchronizing signal coincide in the oscillator 50 according to the phase compensating control signal output from the phase compensating control unit 40. The source clock of the internal horizontal synchronization signal is oscillated as much as possible. When an abnormality occurs in the source clock oscillated by the oscillator 50, the output state of the analog R, G, and B color signals encoded by the RGB encoder 60 Since it is not good, for example, an image that appears on a television monitor does not appear correctly, but an unstable screen such as an image being shaken or an unnatural color is displayed.

Therefore, as shown in FIG. 2, in order to improve the problem of the CDG reproducing apparatus, a synchronization separator 10 extracting and separating an external horizontal synchronization signal and an external vertical synchronization signal from an external image signal provided from an external image source 10 And a phase of the CDG decoder 20 which decodes the graphic information recorded in the subcode on the CDG disc, the external horizontal synchronization signal from the synchronization separating unit 10 and the internal horizontal synchronization signal from the CDG decoder 20. Phase comparator 30 for comparing the phase comparator and phase compensator for controlling the oscillator 50 for oscillating the source clock of the internal horizontal synchronization signal to compensate for the phase difference detected as a result of the comparison in the phase comparator 30. RGB encoder 60 for encoding R, G, B color signals for graphic information applied from the CDG decoder 20 on the basis of the composite synchronization signal from the CDG decoder 20, the CDG decoder 20, and the CDG decoder. A switching unit 70 for superimposing and switching the external video signal and the graphic signal from the RGB encoding 60 at high speed in accordance with the superimposition timing signal from 20, and outputting from the CDG decoder 20. A burst gate pulse generator 80 for outputting an internal color subcarrier pulse based on the complex synchronous signal, and an external color subcarrier pulse received from the internal color subcarrier pulse applied to the RGB encoder 60 A synchronization signal control means (90) for controlling a carrier pulse synchronization to be synchronized with the internal color subcarrier pulses, and the synchronization signal control means (90) is internally applied by the burst gate pulse generator (80). A phase comparison unit 90A for comparing the phase of the color subcarrier pulses with the phase of the external color subcarrier pulses according to the external image signal provided from the external image source, and the phase Phase compensation value control unit 90B which outputs a phase compensation value control signal so that the phase difference can be compensated if the phase difference is detected as a result of the comparison in the granting unit 90A, and the phase compensation value from the phase compensation value control unit 90B. A CDG reproducing apparatus having a superimposed device composed of, for example, an oscillating unit 90C made of a crystal oscillator for applying a color subcarrier oscillated in accordance with a control signal to the RGB encoder 60 has been proposed.

Referring to the operation of the CDG playback apparatus with the improved superimpose function configured as described above, the external horizontal synchronization signal and the external horizontal signal as the external video signal provided from an external video source such as a television is applied to the synchronization separating unit 10. Separated by vertical sync signal. After that, the CRT controller (not shown) in the CDG decoder 20 is reset by the external vertical synchronization signal, and the clock signal from the oscillator 50 input to the CDG decoder 20 is divided by 910 so that the internal horizontal synchronizer is divided. The signal is applied to one end of the phase comparator 30, while the external horizontal synchronization signal from the sync separator 10 is applied to the other end of the phase comparator 30. Accordingly, the phase comparator 30 compares the phase of the external horizontal synchronizing signal with the phase of the internal horizontal synchronizing signal, and as a result, outputs from the phase compensator control unit 40 when a phase error is detected. The oscillator 50 oscillates a clock signal whose source clock oscillation time of the internal horizontal synchronizing signal is adjusted so that the internal horizontal synchronizing signal coincides with the external horizontal synchronizing signal, that is, 14.31818 MHz. Accordingly, the CDG decoder 20 divides the oscillation frequency by 910 to generate a phase compensated internal horizontal synchronizing signal, synthesizes the phase compensated internal horizontal synchronizing signal and the internal vertical synchronizing signal, and outputs the composite synchronizing signal. The R, G, and B color signals for the graphic information according to the decoding result are output. In addition, the CDG decoder 20 outputs a superimposition timing signal for determining a superimposition time through the output terminal A in outputting the composite synchronization signal and the R, C, and B color signals.

In this way, while the various signals are output from the CDG decoder 20, the burst gate pulse generator 80 outputs the internal color subcarrier pulses based on the composite synchronization signal output from the CDG decoder 20. The internal color subcarrier pulses are applied to the RGB encoder 60 and the synchronization signal control means 90. Accordingly, the phase comparator 90A constituting the synchronization signal control means 90 is configured to convert the internal color subcarrier pulse phase from the burst gate pulse generator 80 and the external image mutually provided by the external image source. The phases of the external color subcarrier pulses are compared and the phase compensation value control unit 90B performs phase compensation so that the synchronization of the external color subcarrier pools is synchronized with the synchronization of the internal color subcarrier pools when the phase difference is detected. Outputs a value control signal and the oscillator 90C oscillates 3.579545 MHz, which is a color subcarrier frequency after being correctly phase compensated according to the phase compensation value control signal, and applies it to the RGB encoder 60 so that the RGB encoder 60 After encoding the R, G, and B color signals for the graphic information output as a result of the decoding in the CDG decoder 20, the color ban after corrected phase compensation. The graphic signal is output according to the wave frequency. Accordingly, the switch SW of the latching part 70 is, for example, a superimposing timing output from the output terminal A of the CDG decoder 20 as shown in FIG. 3 (c). On the basis of the Timing) signal, the graphic signal (internal video signal) shown in FIG. 3 (b) is shown in the sections t1 and t2, and the external video signal shown in FIG. 3 (a) is shown in the sections other than t1 and t2. It is switched at a high speed so as to be outputted so that a video signal as shown in FIG. 3 (d) is output on one screen (image).

According to the CDG reproducing apparatus with the improved superimpose function as described above, the external image signal is synchronized with the internal color subcarrier pulse synchronously applied to the RGB encoder 60 by the control operation of the synchronization signal control means 90. As the color subcarrier pools are synchronized, an unstable image is not displayed but a more stable image is displayed.

By the way, CDG discs include video accompaniment, oral fairytale, and educational use. CDG discs for video accompaniment display only lyrics in the background color except for the beginning and end of the song. It is necessary to superimpose lyrics or subtitles that are read and played from a CDG disc in the same external video, but CDG discs for movie play and education do not need an external video to superimpose because they are completely processed with their own graphics.

For this reason, a CDG disc player or a multi-disc player that has a superimpose function is a superimpose mode that superimposes external video and lyrics when an external video signal is input, for example, depending on whether an external video signal is input. If the external video signal is not inputted permanently, switching to the CDG internal mode is required.

In addition, since the external video is not required for the CD and CD for the CD and the education, the phase of the horizontal synchronization signal is not accurately compensated when the mode is switched from the superimpose mode to the CDG internal mode. This causes problems such as flickering or flickering.

In order to solve this problem, the present applicant is able to automatically switch to the superimpose mode that requires an external video signal or the CDG internal mode that does not require an external video signal, depending on the input view of the external video signal. A patent application No. 94-6689 (name: CDG reproducing apparatus) of March 31, 1994, proposed to accurately compensate for the horizontal synchronization signal phase.

Patent application No. 94-6689 shows a synchronization separator 10 for extracting and separating an external horizontal synchronization signal and an external vertical synchronization signal from an external video signal provided from an external video source, as shown in FIG. CDG decoder 20 which decodes the graphic information recorded in the subcode on the CDG disc, and compares the phase of the external horizontal synchronization signal from the synchronization separator 10 with the internal horizontal synchronization signal from the CDG decoder 20. Oscillator 50 for oscillating a source clock for the internal horizontal synchronization signal applied to the CDG decoder 20 in order to compensate the phase difference detected as a result of the comparison in the phase comparison unit 30 and the phase comparison unit 30 A CDG reproducing apparatus having a phase compensation value control unit (40) for controlling a), wherein the external horizontal synchronizing unit from the synchronization separating unit (10) While the signal is controlled to be applied to the phase comparator 30, when there is no input of an external video signal, a synchronization signal switching means 100 for controlling the standard horizontal sync signal to be applied to the phase comparator 30 is added. The synchronization signal switching means 100 includes a synchronization detection unit 100A for detecting synchronization of the external video signal as the external video signal is input, and an external horizontal synchronization signal when the external video signal is not input. A clock oscillator 100B for oscillating a reference clock for making a signal, a divider 100C for generating a standard horizontal synchronizing signal substituted for an external horizontal synchronizing signal by dividing the reference clock signal oscillated in the clock oscillating unit 100B by 910; The switching unit 100D is switched to switch the horizontal synchronization signal to the phase comparator 30 according to the detection signal from the synchronization detection unit 100A.

The CDG reproducing operation according to the above-mentioned patent application 94-6689 is as follows.

First, when the synchronization detection unit 100A in the synchronization signal switching unit 100 detects synchronization of an external video signal, a detection signal corresponding thereto is outputted, so that the switch SW2 of the switching unit 100D is automatically in the superimpose mode. Is connected to an output terminal of the synchronization separator 10. Thereafter, similar to the description of the block diagram of FIG. 2, the CRT controller (not shown) in the CDG decoder 20 is reset by the external vertical synchronous signal separated by the synchronization separator 10, and the CDG decoder ( The clock signal from the oscillator 50 input to the oscillator 50 is input to 910 units and applied to the phase comparator 30 per day as an internal horizontal synchronizing signal, while at the other end of the phase comparator 30, the synchronization isolator. An external horizontal synchronizing signal from (10) is applied. Accordingly, when a phase error is detected as a result of the comparison in the phase comparator 30, the oscillator 50 oscillates a source clock of the internal horizontal synchronization signal according to the phase compensating control signal output from the phase compensating value controller 40. It will oscillate the clock signal with time adjustment. Accordingly, the CDG decoder 20 divides the oscillation frequency by 910 to generate a phase-compensated internal horizontal synchronizing signal, and synthesizes the phase-compensated internal horizontal synchronizing signal and the internal vertical synchronizing signal and outputs the composite synchronizing signal. In outputting the R, G, and B color signals for the graphic information according to the decoding result, the superimposition timing signal for determining the superimposition time is output through the output terminal A.

On the other hand, the burst gate pulse generating unit 80 is to force the internal color subcarrier pulse based on the composite motion signal output from the CDG decoder 20, the internal color subcarrier pulse is synchronized with the RGB encoder 60 As applied to the control means 90, the phase comparator 90A constituting the synchronization signal control means 90 includes an internal color subcarrier pulse phase from the burst gut pulse generator 80 and an external image source. The phases of the external color subcarrier pulses of the external video signal provided by the PSA are compared, and the phase compensation value controller 90B compares the external color subcarrier pulses with the synchronization of the internal color subcarrier pulses when the phase comparison result is detected. The phase compensation value control signal is output so that the synchronization is synchronized with the oscillator 90C. 3.57954, which is the color subcarrier frequency after the phase compensation is correctly performed according to the phase compensation value control signal. Oscillates and applies to the RGB encoder 60, the RGB encoder 60 encodes R, G, and B color signals for graphic information output from the decoding result of the CDG decoder 20, and then accurately compensates for the phase. The graphic signal is output according to the following color subcarrier frequency. Accordingly, the switch SW1 of the switching unit 70 has a high speed based on the superimposition timing signal output from the output terminal A of the CDG decoder 20 so that the external image signal and the graphic signal are superimposed. The switching operation is performed so that a screen (image) is output.

On the other hand, when there is no synchronization signal of the external video signal detected by the synchronization detection unit 100A, there is no output of the detection signal accordingly, so that the switch SW2 automatically divides the divider to perform the operation of the CDG internal mode. Connect to the output terminal of 100C). Subsequently, the reference clock signal of the 14.31818 MHz band oscillated by the clock oscillator 100B is 910 subdivided by the divider 100C and applied to the phase comparator 30 as a standard horizontal synchronization signal. At this time, the reset pin of the CRT controller (not shown) in the CDG decoder 20 is set to the high state, that is, the internal reset mode, and the CDG decoder 20 is internally leveled. When the synchronization signal is applied to the phase comparator 30, the phase comparator 30 compares the phases of the standard horizontal synchronization signal and the internal horizontal synchronization signal. As a result of the comparison, when the phase error is detected, the operation is performed according to the phase compensation operation and subsequent processing procedures as in the superimpose mode described above, while the superimpose output from the CDG decoder 20 is performed. Since there is no timing signal, only the internal video signal output from the RGB encoder 60 is output through the switching unit 70.

According to Patent Application No. 94-6689 as described above, the horizontal synchronization signal as a comparison target, which is transferred to the phase comparison unit through the switching unit in the synchronization signal switching means, changes according to the presence or absence of an external video signal. Since the phase of the applied horizontal synchronization signal is accurately compensated by the compensation operation, an unstable screen such as a screen shake is not generated.

However, in the CDG reproducing apparatus of the aforementioned patent application 94-6689, in order to generate a standard horizontal synchronization signal, which is a substitute for an external horizontal synchronization signal, by dividing the reference clock signal oscillated by the clock oscillator 100B 910, The divider (100C), which is composed of TTL (Transistor-Transistor Logic) ICs, was separately configured, resulting in complicated hardware configuration inside the system.

Accordingly, the present invention has been made in view of the above circumstances, and an object thereof is to provide a CDG reproducing apparatus with a simpler hardware configuration by using a counter in the microcomputer as a substitute for the frequency divider.

In order to achieve the above object, the CDG reproducing apparatus according to the present invention determines whether an external video signal is input and controls the external horizontal synchronization signal from the synchronization separator to be applied to the phase comparator when there is an external video signal input. In the CDG reproducing apparatus having the same synchronizing signal switching means for controlling the standard comparator synchronization signal to be applied to the phase comparator when there is no external video signal input,

The synchronization signal switching means includes a synchronization detector for detecting synchronization of the external video signal as an external video signal is input, and a clock oscillator for oscillating a reference clock for generating an external horizontal synchronization signal when the external video signal is not input. A microcomputer that counts a reference clock signal from the clock oscillator and outputs the standard horizontal synchronous signal based on the count value, and a corresponding horizontal synchronous signal according to the presence or absence of a detection signal from the synchronization detector. The switching unit is switched to be switched to be applied to the phase comparator.

According to the present invention configured as described above, by generating and outputting from the microcomputer by the count operation of the counter inside the microcomputer, the standard horizontal synchronizing signal, which is a substitute for the external smooth synchronizing signal, makes the hardware configuration simpler.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

5 is a main block of the CDG reproducing apparatus according to the present invention, the apparatus according to the present invention is a synchronization detection unit (100A), clock oscillator (100B), switching unit (100D), microcomputer (100F) internal counter (100E) Since the synchronization signal switching means 100 is configured, the same components as those described in FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted.

In the figure, the counter 100E is incorporated in the microcomputer 100F described later and counts the number of pulses of the reference clock signal (for example, 14.31818 MHz) output from the clock oscillator 100B.

The microcomputer 100F outputs a standard horizontal synchronizing signal (that is, a signal stored in advance) that is an alternative to the external horizontal synchronizing signal based on the count value from the counter 100E.

In addition, although not shown in the drawing, the microcomputer 100F controls the operation of the control function set by the control function setting means (not shown) such as a remote controller.

Referring to the operation of the CDG playback apparatus according to the present invention configured as described above are as follows.

In the embodiment description of the present invention, only the case where there is no synchronization signal of the external video signal detected by the synchronization detection unit 100A will be described.

Once there is no synchronization signal of the external video signal detected by the synchronization detection unit 100A, there is no output of the detection signal. Therefore, the switch SW2 automatically performs the microcomputer 100F to perform the CDG internal mode operation. Is connected to the standard horizontal synchronous signal output. Subsequently, the reference clock signal of the 14.31818 MHz band oscillated by the clock oscillator 100B is applied to the counter 100E in the microcomputer 100F to be counted, and the signal (that is, the coefficient value) counted by the counter 100E is counted. The microcomputer 100F is applied to the microcomputer 100F, and the microcomputer 100F stores a standard horizontal synchronization signal stored in advance on the basis of the count value in the phase comparison unit 30 and the standard horizontal synchronization signal and the CDG decoder (see FIG. 4). 20, phases of the internal horizontal synchronization signals are compared with each other, and the subsequent operation is performed in the same manner as the operation description based on the block diagram of FIG.

According to the present invention as described above, by generating and outputting the standard horizontal synchronous signal, which is a substitute for the external horizontal synchronous signal, by using the counter inside the microcomputer without using a separate divider, it is possible to compare the hardware of the conventional CDG reproducing apparatus. The advantage is simpler configuration.

Claims (1)

When the external video signal is input and the external video signal is input, the external horizontal synchronization signal from the synchronization separator 10 is controlled to be applied to the phase comparator 30, while the input of the external video signal is controlled. If there is no CDG reproducing apparatus having a synchronization signal switching means 100 for controlling its standard horizontal synchronization signal to be applied to the phase comparator 30, the synchronization signal switching means 100 receives an external video signal. As a result, a synchronization detector 100A for detecting synchronization of the external video signal, a clock oscillator 100B for generating a reference clock for generating an external horizontal synchronization signal when no external video signal is input, and a counter 100E are built in. And the microcomputer 100F for counting the reference clock signal from the clock oscillator 100B to the counter 100E and outputting the standard horizontal synchronization signal based on the count value. And a switching unit (100D) which is switched so that a corresponding horizontal synchronizing signal is applied to the phase comparing unit (30) in accordance with the presence or absence of a detection signal from the synchronization detecting unit (100A).