JPH03244283A - Synthesizer of graphics character signal and color video signal - Google Patents

Abstract

PURPOSE:To obtain synthesized output composite color video signal and output composite color graphics character signal simultaneously by supplying clock signals from a PLL circuit and a clock oscillator to a decoder circuit by switching corresponding to the presence/absence of an input composite color video signal. CONSTITUTION:A primary color graphics character signal from the decoder circuit 7 or luminance and a color difference graphics character signal from a superimposing circuit 17 is supplied to a composite encoder circuit 16, and is converted to the output composite color graphics character signal. When switches SW1, SW2 are controlled by the detection output of a video signal detection circuit 28, and a composite color video signal can be obtained from a laser disk video deck 2, the switch SW1 is turned on, and when the switch SW2 is switched to the voltage controlled oscillator 20 side of the PLL circuit 33, and no composite color video signal from the laser disk video deck 2 is obtained, the switch SW1 is turned off and the switch SW2 is switched to a master clock oscillator 9 side.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a CD player obtained by combining a compact disc (CD) player, a video disc player or VTR, a microphone, a speaker, and a monitor receiver. The present invention relates to a graphics character signal and color video signal synthesis device suitable for application to a video karaoke device.

[Summary of the invention]

The present invention decodes a coded digital graphics character signal reproduced from a recording medium on which a coded digital audio signal and a related coded digital graphics character signal are recorded, and outputs a primary color graphics character signal. a superimpose circuit that converts a primary color graphics character signal from the decoding circuit and an input composite color video signal reproduced from another recording medium into an output composite color video signal; a composite encode circuit for providing the primary color graphics character signals from the decoding circuit or the luminance and color difference graphics character signals from the superimposing circuit and converting them into an output composite color graphics character signal; a clock oscillator; It has a PLL circuit that outputs a clock signal that is phase-synchronized with the horizontal synchronization signal in the composite color video signal,
Depending on the presence or absence of input composite color video signal, P
By switching and supplying the clock signal from the LL circuit and the clock oscillator to the decoding circuit, a simple circuit configuration allows the primary color graphics character signal from the decoding circuit and the input composite color video signal to be input when there is an input composite color video signal. It is possible to simultaneously obtain an output composite color video signal which is a base color video signal and an output composite color graphics character signal which is a modulated primary color graphics character signal from a decoding circuit.

[Conventional technology]

Conventionally, instrumental performances (orchestra performances) of popular songs are recorded as digital audio signals encoded on compact discs, and their subcodes PXQ, R, S,
The lyrics of the popular song are recorded as a coded digital graphics character signal in the R to W codes in T, U, , V, W (7), that is, the user's video, and this compact disc is The reproduced coded digital audio signal is reproduced by a CD player, and the reproduced coded digital audio signal is decoded and supplied to a speaker through a low frequency amplifier to be outputted, and the reproduced encoded digital graphics character signal is decoded to produce graphics characters. A CD video karaoke device has been proposed that obtains a signal, encodes this graphics character signal into a composite color character signal, supplies it to a monitor receiver, and projects the lyrics of a popular song on the screen. .

In addition, in such a CD video karaoke apparatus, a graphics character signal is added to a composite color video signal that reproduces landscapes, people, etc. from a video disc player, VTR, etc., and a composite color video with the graphics character signal added to the composite color video signal is added. A CD video karaoke device has been proposed that supplies a signal to a monitor receiver and displays the lyrics of a popular song on the screen superimposed on images of scenery, people, etc. (Refer to Publication No.-214178).

[Problem to be solved by the invention]

Of these two types of conventional CD video karaoke devices, the former is preferable for those who sing because only the lyrics are displayed on the monitor screen, but on the other hand, it is difficult for those who are listening to the song. has the drawback of being unsatisfactory.

Also, the latter is preferable for people listening to songs, but
On the other hand, for those who sing, it is difficult to see the text of the lyrics because the lyrics are displayed in the form of images of landscapes, people, etc. on the screen of the monitor receiver.

Therefore, the present inventor provided two monitor receivers, one for the person singing the song and another for the person listening to the song, and the screen of the former had the following: Only the lyrics are displayed, and the latter screen displays the lyrics of popular songs.
A CD that is projected over images of landscapes, people, etc.
Invented a video karaoke device.

According to this, the drawbacks of the two types of conventional CD video karaoke devices are both eliminated.

A reference example of a CD video karaoke apparatus in which such drawbacks have been eliminated will be described below with reference to FIG. 2.

(1) is a CD player in which the instrumental performance (orchestra performance) of a popular song is recorded as a coded digital audio signal, and the lyrics of the popular song are recorded in its subcode R-W, that is, the user's binoto. A compact disc (CD) recorded as a coded digital graphics character signal is played back, and among the playback signals, the coded digital audio signal is decoded and subjected to various signal processing to produce the data shown in the figure. is supplied to the speaker through a low frequency amplifier omitting the subcode output R-W.
and subcode readout clock signal EX (J) are supplied to the subcode decode IC control CPU and error correction CPU (3).

Note that IC indicates a semiconductor integrated circuit. Also, a CPU for subcode decoding IC control and a CPU for error correction.
U (3) includes a crystal oscillator that generates the system clock signal.

In this subcode decoding IC control CPU and error correction CPU (3), the subcode output R
-W's 98 frames are stored as one block in its attached S-RAM f4), and after error correction processing and other signal processing are performed on this, subcode decoding IC (5), (7).

These subcode decode IC(5) and (7) decode the subcode R-W, that is, the coated digital graphics character signal, to obtain digital primary color graphics character signals R, G, and B.

Note that these subcode decode ICs (5), (7
) are respectively equipped with D-RAMs (6) and (8) for image processing.

(9) is the master clock oscillator, which will be used in 14.3 from now on.
The 118 MHz master signal MC is supplied to the subcode decoding IC (5).

(2) is a laser disc video deck, in which a coded digital video signal of a moving image or still image is played back from a laser disc, this is decoded to obtain a composite color video signal, and this composite color video signal is The vertical and horizontal synchronizing signals H-5YNC and V-SYNC are supplied to a separation circuit (26), where
are separated.

Vertical synchronization signal sea 5Y from this synchronization separation circuit (26)
NC is supplied to a subcode decoding IC (7) and a video signal detection circuit (28). Video signal detection circuit (
28) is the vertical synchronization signal V- from the synchronization separation circuit (26).
When SYNC is supplied, an input detection signal of a composite color video signal is generated and the detection signal is supplied to the subcode decoding IC (7).

Horizontal synchronization signal H-SYNC from synchronization separation circuit (26)
is supplied to the waveform shaping circuit (27) and shaped, and the waveform shaped horizontal synchronization signal H-SYNC is sent to the PLL.
The signal is supplied to a phase comparator (32) forming a circuit (33).

Note that this phase comparator (32) is a subcode decode I
C(7).

In this phase comparator circuit (32), 14.311
The phase of the 8 MHz master clock signal MC' is compared with the horizontal synchronization signal H-SYNC from the waveform shaping circuit (27), and the comparison output is used for voltage control through the low-pass filter (30) that constitutes the PLL circuit (33). type oscillator (2
9) as a frequency control signal. This master clock signal MC' is used as a synchronous clock signal.

The digital primary color graphics signals R, G, B from the subcode decoding ICs (5), (7) are sent to D/A converters and amplifiers (10〉, (11), (12) and (1
3), (14), and (15), are converted into analog primary color graphics signals R, G, and B, and are amplified and sent to superimpose ICs (16), (15), respectively.
7). These superimposed ICs (1
6), (17), the built-in conversion circuit (matrix circuit) converts the primary color graphics signal R1G,
B, luminance signal Y, red difference signal RY, blue difference signal B-
These luminance signal Y, red difference signal R-Y, and blue difference signal B-Y are sent to external amplifiers (21) and (22), respectively.
), (23), respectively, and then supplied again to the superimpose ICs (16), (17).

These superimposed ICs (16) and (17) are
Each has a crystal oscillator that generates a color subcarrier signal.

The superimpose IC (17) uses its built-in demodulation circuit to demodulate the composite color video signal from the laser disc video deck (2) to produce a luminance signal Y, a red difference signal RY, and a blue difference signal B-Y. The luminance signal Y, the red difference signal RY, and the blue difference signal B-Y are synthesized with the graphics luminance signal Y, the red difference signal RY, and the blue difference signal BY, respectively, and the synthesized luminance signal is obtained. Y, red difference signal R-Y, and blue difference signal B-Y are modulated into, for example, an NTSC system composite color video signal by its built-in modulation circuit, and outputted to an output terminal (24). This output composite color video signal, not shown, is supplied to a monitor receiver for the person listening to the song so that it is displayed on the screen, superimposed on a background moving or still image.
The lyrics of popular songs are displayed. The characters representing the lyrics are used in a CD player (1), similar to a so-called laser karaoke device.
The letters change as well as the color of the letters as the popular songs are played.

The other superimpose IC (16) outputs a graphics luminance signal Y, a red difference signal RY, and a blue difference signal B.
-Y by its built-in modulation circuit, e.g.
The signal is modulated into a composite color graphics character signal and output to the output terminal (25). Although not shown, this output composite color graphics character signal is supplied to another monitor receiver, that is, a monitor receiver for the singer, so that only the lyrics of the popular song are displayed on the screen. make it possible to do so. Similarly, the letter representing this lyrics is C.
The characters change in accordance with the performance of popular songs from the D player (1), and the colors of the characters also change.

By the way, in this reference example, the subcode decoding IC
Since there are two, (5) and (7), the structure seems complicated. In addition, subcode decoding ICs (5), (7
), the attached RA
M also requires (6) and (7), and D/A converters and amplifiers also require (10), (11), (12), and (1).
3), (14), and (15〉) are required.

In view of this point, the present invention has a simple circuit configuration,
When there is an input composite color video signal, the primary color graphics character signal from the decoding circuit and the combined output composite color video signal of the input composite color video signal and the modulated output of the primary color graphics character signal from the decoding circuit. It is an object of the present invention to propose a graphics character signal and color video signal platform device that can simultaneously obtain composite color graphics character signals.

[Means to solve the problem]

The graphics character signal and color video signal synthesizing device of the present invention reproduces a coded digital graphics character signal reproduced from a recording medium on which a coded digital audio signal and a coded digital graphics character signal related thereto are recorded. A decoding circuit (7) that decodes and outputs a primary color graphics character signal, and combines the primary color graphics character signal from the decoding circuit (7) with an input composite color video signal reproduced from another recording medium. and a superimpose circuit (17) which converts it into an output composite 7-color video signal, and a primary color graphics character signal from the decoding circuit (7) or luminance and color difference graphics from the superimpose circuit (17). a composite encoder circuit (16) for supplying a character signal and converting it into an output composite color graphics character signal; a clock oscillator (9); PLL circuit (33) that outputs a synchronized clock signal
), and a PLL circuit (33) and a clock oscillator (9) depending on the presence or absence of an input composite color video signal.
) is switched and supplied to the decoding circuit (7).

[Effect]

According to the present invention, the coded digital graphics character signal reproduced from the recording medium on which the coded digital audio signal and the related coded digital graphics character signal are recorded is supplied to the decoding circuit (7). and decoded to output a primary color graphics character signal.

The primary color graphics character signal from the decoding circuit (7) and the input composite color video signal reproduced from another recording medium are sent to the superimpose circuit (17).
) and converted to an output composite color video signal. The primary color graphics character signals from the decoding circuit (7) or the luminance and color difference graphics character signals from the superimposing circuit (17) are supplied to the composite encoding circuit (16) to form an output composite color graphics character signal. converted. The clock signal from the clock oscillator (9) and the PLL circuit (33) that outputs a clock signal that is phase-synchronized with the horizontal synchronization signal in the human-powered composite color video signal, depending on the presence or absence of the input composite color video signal, The signal is switched and supplied to the decoding circuit (7).

〔Example〕

Embodiments of the present invention will be described in detail below with reference to FIG. 1. In FIG. 1, parts corresponding to FIG.
The same reference numerals are used to omit redundant explanation. Subcode decoding IC control CPU and error correction CP
The subcode output from TJ (3) is supplied to one subcode decoding IC (7).

The horizontal synchronization signal old 5YNC from the synchronization separation circuit (26) is supplied to the waveform shaping circuit (27), where the waveform is shaped, and the waveform-shaped horizontal synchronization signal H-5YNC is used as a phase control signal forming the PLL circuit (33). A comparator (32) is supplied. Note that this phase comparator (32) is provided in the subcode decoding IC (7).

In this phase comparator circuit (32), 14.311
The phase of the 8 MHz mask clock signal MC' is compared with the horizontal synchronization signal H-SYNC from the waveform shaping circuit (27), and the comparison output is used for voltage control through the low-pass filter (30) that constitutes the PLL circuit (33). type oscillator (2
9) as a frequency control signal.

A mask clock signal from the PLL circuit (33) and master clock oscillator (9) is supplied to the subcode decode IC (7) through the changeover switch SW2 and used as a synchronization clock signal.

The digital primary color graphics signals R, G, B from the subcode decoding IC (7) are supplied to the D/A converter and amplifiers (13), (14), (15) to generate the analog primary color graphics signal R. , G, and B, are amplified and supplied to the superimpose IC (17). In superimpose IC (17),
Its built-in conversion circuit (matrix circuit) converts the primary color graphics signals R, G, and B into a luminance signal Y, a red difference signal R-Y, and a blue difference signal B-Y. After the R-Y and blue difference signals B-Y are amplified by external amplifiers (21), (22), and (23), respectively, superimposed ICs (16), (
17).

Also, the 3.579545 MHz color subcarrier signal SC from the built-in color subcarrier oscillator of the superimpose IC (17) is supplied to the superimpose IC (16).

The superimpose IC (17) uses its built-in demodulation circuit to convert the composite color video signal supplied from the laser disc video deck (2) through the on/off switch SWI into a luminance signal Y and a red difference signal R-. Y, blue difference signal BY are obtained, and these luminance signal Y, red difference signal R-Y, blue difference signal B-Y,
Graphics luminance signal Y, red difference signal RY, respectively.
The blue difference signal B-Y is bottomed out, and the bottomed luminance signal Y is
, red difference signal RY, and blue difference signal B-Y are modulated into, for example, an NTSC system composite color video signal by its built-in modulation circuit, and outputted to an output terminal (24).

The other superimposed IC (16) has an amplifier (
The graphics luminance signal Y, red difference signal R-Y, and blue difference signal B-Y from 21), (22), and (23) are converted into, for example, an NTSC composite color graphics character using its built-in modulation circuit. It is modulated into a signal and output to the output terminal (25).

The above-mentioned switches SWI and SW2 are controlled by the detection output of the video signal detection circuit (28), and when a composite color video signal is obtained from the laser disc video deck (2), the switch SW is turned on.
The switch SW2 is switched to the voltage-controlled oscillator (29) side of the PLL circuit (33), and when a composite color video signal cannot be obtained from the laser disc video deck (2), the switch SW1 is turned off and the switch SW2 is switched to the mask clock. Switched to the oscillator (9) side.

Note that instead of the superimpose IC (16), the graphics luminance signal Y, red difference signal RY, and blue difference signal BY from the amplifiers (21), (22), and (23) are
For example, a modulator may be provided for modulating into a composite NTSC 7-channel graph isograph signal.

Further, the digital primary color graphics signals R, G, and B from the subcode decoding IC (7) are supplied to D/A converters and amplifiers (13), (14), and (15).
It is converted into analog primary color graphics signals R, G, .
(16) and superimpose I
C(16), its built-in conversion circuit (matrix circuit)
The primary color graphics signals R, G, and B are converted into a luminance signal Y, a red difference signal RY, and a blue difference signal B-Y, and these luminance signal Y, red difference signal RY, and blue difference signal B are
-Y are external amplifiers (21), (22) similar to FIG.
), (23), and then supplied to the superimpose IC (16), and the graphics luminance signal Y, red difference signal RY, and blue difference signal B-
Y may be modulated into, for example, an NTSC system composite color graphics character signal by its built-in modulation circuit, and outputted to the output terminal (25). In this case, the superimpose IC (16) may also be provided with a color subcarrier oscillator.

Also, instead of the laser disc video deck (2),
Other video signal reproducing devices such as a VTR may also be used.

According to the graphics character signal and color video signal synthesis apparatus of this embodiment, compared to the graphics character signal and color video signal synthesis apparatus of the reference example shown in FIG. 7),
Only one D/A converter and amplifier are required (8).
Only one set of 13), (14), and (15) is required.

〔Effect of the invention〕

According to the device for synthesizing graphics character signals and color video signals of the present invention described above, with a simple circuit configuration,
When there is an input composite color video signal, a combined output composite of the primary color graphics character signal from the decoding circuit and the human-powered composite color video signal, the composite color video signal and the primary color graphics character signal from the decoding circuit. A modulated output composite and 7-color graphics signal can be obtained simultaneously.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing a reference example. (1) is a CD player, (2) is a laser disc video deck, (3) is a subcode decoding IC control CPU and error correction CPU (3), (4)
is RAM, (7) is subcode decode IC1 (8) is RAM, (9) is mask clock oscillator, (13), (
14) and (15) are D/A converters and amplifiers, respectively.
6) and (17) are superimposed IC, (2
1), (22) and (23) are amplifiers, (24) and (
25) are output terminals, and (26) is a synchronous separation circuit (26).
), (27) is a waveform shaping circuit, (28) is a video signal detection circuit, (29) is a voltage controlled oscillator, (30) is a low-pass filter, (31) is an amplifier, and (33) is a PLL circuit.

Claims (1)

[Scope of Claims] The coded digital graphics character signal reproduced from the recording medium on which the coded digital audio signal and the related coded digital graphics character signal are recorded is decoded to produce primary color graphics characters. a decoding circuit that outputs a signal; and a superimulator that combines the primary color graphics character signal from the decoding circuit with an input composite color video signal reproduced from another recording medium and converts the signal into an output composite color video signal. a composite encoder circuit for providing a primary color graphics character signal from said decoding circuit or a luminance and color difference graphics character signal from said superimposing circuit and converting it into an output composite color graphics character signal; an oscillator; and a PLL circuit that outputs a clock signal phase-synchronized with a horizontal synchronization signal in the input composite color video signal, and the PLL circuit and the clock oscillator 1. An apparatus for synthesizing graphics character signals and color video signals, characterized in that a clock signal from the decoding circuit is switched and supplied to the decoding circuit.