JP3067148B2 - Graphics character signal and color video signal synthesizer - Google Patents

Description

The present invention relates to a compact disc (CD) player, a video disc player or VTR, a microphone,
The present invention relates to a graphics character signal and color video signal synthesizing device suitable for a CD video karaoke device obtained by combining a speaker and a monitor receiver.

[Conventional technology]

Conventionally, musical performances of orchestras (orchestra performances) are recorded as digital audio signals encoded on a compact disk, and their subcodes P, Q, R,
The lyrics of the song are recorded as coded digital graphics character signals in the R to W codes of S, T, U, V, and W, that is, user's bits. And decodes the reproduced coded digital audio signal and supplies the coded digital audio signal to a speaker through a low-frequency amplifier to cause the loudspeaker to decode the reproduced coded digital graphics character signal. There has been proposed a CD video karaoke apparatus in which the graphics character signal is encoded into a composite color character signal and supplied to a monitor receiver to display the lyrics of a song on a screen thereof.

Further, in such a CD video karaoke apparatus, a graphics character signal is synthesized with a composite color video signal of a scene, a person or the like from a video disk player, a VTR, or the like, and the composite color video signal synthesized with the graphics character signal is output. Supply to the monitor receiver,
There has been proposed a CD video karaoke apparatus in which lyrics of a popular song are displayed on the screen so as to be superimposed on images of a landscape, a person, and the like (for example, see Japanese Patent Application Laid-Open No. Sho 60-214178).

[Problems to be solved by the invention]

Of the two conventional types of CD video karaoke apparatuses, the former is preferable for singers because only the lyrics are displayed on the screen of the monitor receiver, but on the other hand, for those who are listening to the songs. Has the disadvantage of being unsatisfactory.

The latter is preferable for those who are listening to the song, but on the other hand, for those who sing the song, the lyrics are superimposed on the screen of the monitor receiver and the images of the scenery, people, etc. There is a drawback that the character is difficult to see.

Therefore, the present inventor provided two monitor receivers, that is, a monitor receiver for a person who sings a song and a monitor receiver for a person listening to the song. Only the lyrics are projected, and on the latter screen, the lyrics of the song are projected on top of images of landscapes, people, etc.
A CD video karaoke device was devised.

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

Therefore, a reference example of a CD video karaoke apparatus in which such a defect is eliminated will be described below with reference to FIG.

(1) is a CD player in which musical instrument performances of orchestras (orchestra performances) are recorded as coded digital audio signals, and the lyrics of the songs are recorded in sub-codes RW, that is, user bits. A compact disc (CD) recorded as a coded digital graphics character signal is reproduced, and among the reproduced signals, a coded digital audio signal is decoded and various signal processes are performed. It is supplied to the speaker through the omitted low-frequency amplifier, and the sub-code outputs R to W
Are supplied to the sub-code decode IC control CPU and the error correction CPU (3). Note that IC indicates a semiconductor integrated circuit. Also for subcode decode IC control
The CPU and the CPU for error correction (3) include a crystal oscillator for generating a system clock signal.

In the CPU for controlling the sub-code decoding IC and the CPU for error correction (3), the sub-code outputs R to W
The SRAM for each frame is one block.
After accumulating it in (4) and subjecting it to error correction and other signal processing, the subcode decode IC (5)
(7).

The subcode decoding ICs (5) and (7) decode the subcodes R to W, that is, the coded digital graphics character signals, to obtain digital primary color graphics character signals R, G and B. Note that these subcode decode ICs (5) and (7) are provided with D-codes for image processing, respectively.
RAMs (6) and (8) are provided.

(9) is the master clock oscillator.
8MHz master clock signal MC is a subcode decode IC
(5).

(2) a laser disk video deck, in which a coded digital video signal of a moving image or a still image is reproduced from the laser disk and decoded to obtain a composite color video signal, and this composite color video signal is synchronized and separated. It is supplied to a circuit (26) where the vertical and horizontal synchronization signals H-SYNC, V-SYNC are separated.

The vertical synchronizing signal V-SYNC from the synchronizing separation circuit (26)
Is supplied to the subcode decode IC (7) and the video signal detection circuit (28). The video signal detection circuit (28)
When the vertical synchronizing signal V-SYNC is supplied from the synchronizing separation circuit (26), an input detection signal of a composite color video signal is generated, and the detection signal is converted to a subcode decoding IC.
(7).

The horizontal synchronizing signal H-SYNC from the synchronizing separation circuit (26) is supplied to a waveform shaping circuit (27) to be shaped, and the waveform-shaped horizontal synchronizing signal H-SYNC forms a PLL circuit (33). It is supplied to the phase comparator (32). The phase comparator (32) is provided in the subcode decode IC (7).

In this phase comparison circuit (32), a 14.3118 MHz master clock signal MC 'from a voltage controlled oscillator (29) constituting a PLL circuit (33) is converted into a horizontal synchronization signal H-SYNC from a waveform shaping circuit (27). And a phase comparison, and the comparison output is passed through a low-pass filter (30) constituting a PLL circuit (33).
It is supplied to the voltage controlled oscillator (29) 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 decode ICs (5), (7) are D / A converters and amplifiers (10), (11), (! 2) and (13), (13). 14),
It is supplied to (15), converted into analog primary color graphics signals R, G, B, amplified and supplied to superimpose ICs (16), (17), respectively. In these superimposed ICs (16) and (17), the built-in conversion circuit (matrix circuit) converts the primary color graphics signals R, G, and B into a luminance signal Y and a red color difference signal R-G.
Y and a blue difference signal BY, and these luminance signal Y, red difference signal RY and blue difference signal BY are amplified by external amplifiers (21), (22) and (23), respectively. After that,
Again, it is supplied to the superimpose ICs (16) and (17). Each of these superimpose ICs (16) and (17) has a crystal oscillator for generating a color subcarrier signal.

The superimposed IC (17) demodulates the composite color video signal from the laser disk video deck (2) by its built-in demodulation circuit, and outputs a luminance signal Y, a red difference signal RY, and a blue difference signal BY. And these luminance signal Y, red color difference signal RY, blue color difference signal BY
A graphics luminance signal Y, a red color difference signal RY,
The blue color difference signal BY is synthesized, and the synthesized luminance signal Y, red color difference signal RY, and blue color difference signal BY are modulated by the built-in modulation circuit into, for example, an NTSC composite color video signal. And outputs it to the output terminal (24). The output composite color video signal, not shown, is supplied to a monitor receiver for the person listening to the song, and the lyrics of the pop song are displayed on the screen so as to overlap the background moving image or still image. Will be issued. The characters representing the lyrics change in color and the color of the characters in accordance with the performance of the song from the CD player (1), similarly to the so-called laser karaoke apparatus.

In the other superimpose IC (16), a luminance signal Y, a red color difference signal RY, and a blue color difference signal B-
Y is modulated into, for example, a composite color graphics character signal of the NTSC system by its built-in modulation circuit and output to an output terminal (25). This output composite color graphics character signal is supplied to another monitor receiver, not shown, that is, a monitor receiver for a song singer, so that only the lyrics of the pop songs are projected on the screen. To be Similarly, the character representing the lyrics changes in accordance with the performance of the song from the CD player (1), and the color of the character changes.

By the way, in this reference example, the subcode decode IC
(5) and (7) are provided, which complicates the configuration. Also, the subcode decode ICs are (5) and (7) are 2
Along with the provision of the RAM, two additional RAMs (6) and (7) are required, and D / A converters and amplifiers are also (10), (11), (12) and ( 13), (14),
(15) and two sets are required.

In view of this point, the present invention provides a simple circuit configuration, when there is an input composite color video signal,
The output composite color video signal obtained by synthesizing the primary color graphics character signal and the input composite color video signal from the decoding circuit, and the modulated output composite color graphics character signal of the primary color graphics character signal from the decoding circuit are simultaneously output. An object of the present invention is to propose an apparatus for synthesizing a graphics character signal and a color video signal which can be obtained.

[Means for solving the problem]

An apparatus for synthesizing a graphics character signal and a color video signal according to the present invention provides a coded digital graphics character signal reproduced from a recording medium on which a coded digital audio signal and an associated coded digital graphics character signal are recorded. Decoding means for outputting a primary color graphics character signal, and combining the primary color graphics character signal from the decoding means with an input composite color video signal reproduced from another recording medium to produce an output composite A superimposing means for converting the primary color graphics character signal from the decoding means into a luminance and color difference graphics character signal, and a primary color graphics character signal from the decoding means or Luminance and color difference Composite encoding means for supplying a fixed character signal and converting it to an output composite color graphics character signal, clock oscillating means, and PLL means for outputting a clock signal synchronized in phase with a horizontal synchronization signal in the input composite color video signal The clock signal from the PLL means and the clock oscillating means is switched and supplied to the decoding means according to the presence or absence of the input composite color video signal.

[Action]

According to the present invention, 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 is decoded by decoding means, Outputs primary color graphics character signal. The superimposing means combines the primary color graphics character signal from the decoding means with the input composite color video signal reproduced from another recording medium, converts the synthesized signal into an output composite color video signal, and outputs the composite color video signal from the decoding means. The primary color graphics character signal is converted into a luminance and color difference graphics character signal. The primary color graphics character signal from the decoding means or the luminance and color difference graphics character signal from the superimposing means is converted into an output composite color graphics character signal by the composite encoding means. The PLL means outputs a clock signal that is phase-synchronized with the horizontal synchronization signal in the input composite color video signal. The clock signal from the PLL means and the clock oscillating means is switched and supplied to the decoding means according to the presence or absence of the input composite color video signal.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIG. 1. In FIG. 1, portions corresponding to FIG. 2 are denoted by the same reference numerals, and redundant description will be omitted. . Subcode decode IC control CPU and error correction CPU
The subcode output from (3) is supplied to one subcode decode IC (7).

The horizontal synchronizing signal H-SYNC from the synchronizing separation circuit (26) is supplied to a waveform shaping circuit (27) to be shaped, and the waveform-shaped horizontal synchronizing signal H-SYNC forms a PLL circuit (33). It is supplied to the phase comparator (32). The phase comparator (32) is provided in the subcode decode IC (7).

In this phase comparison circuit (32), a 14.3118 MHz master clock signal MC 'from a voltage controlled oscillator (29) constituting a PLL circuit (33) is converted into a horizontal synchronization signal H-SYNC from a waveform shaping circuit (27). And a phase comparison, and the comparison output is passed through a low-pass filter (30) constituting a PLL circuit (33).
It is supplied to the voltage controlled oscillator (29) as a frequency control signal.

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

The digital primary color graphics signals R, C, and B from the subcode decode IC (7) are supplied to a D / A converter and an amplifier (1).
3), (! 4), and (15), are converted into analog primary color graphics signals R, G, and B, amplified, and supplied to a superimpose IC (17). In the superimpose IC (17), the primary color graphics signal R,
G and B are converted into a luminance signal Y, a red color difference signal RY, and a blue color difference signal BY, and these luminance signal Y and red color difference signal R-Y are converted.
Y and the blue difference signal BY are supplied to an external amplifier (21), respectively.
After being amplified by (22) and (23), they are supplied to the superimposed ICs (16) and (17). 3.57 from the built-in color subcarrier oscillator of the superimpose IC (17)
Superimpose IC for 9545MHz color subcarrier signal SC
Supply to (16).

In the superimpose IC (17), the laser demodulator (2)
The composite color video signal supplied through the on / off switch SW1 is demodulated to obtain a luminance signal Y, a red difference signal RY, and a blue difference signal BY, and these luminance signal Y, red difference signal RY, and blue difference signal are obtained. The signal BY has a luminance signal Y, a red color difference signal RY, and a blue color difference signal B-
Y, and the combined luminance signal Y and red color difference signal R
-Y, the blue difference signal BY is modulated by the built-in modulation circuit into, for example, an NTSC composite color video signal and output to the output terminal (24).

The other superimposed IC (16) uses an amplifier (2
The luminance signal Y, red color difference signal RY, and blue color difference signal BY of the graphics from 1), (22), and (23) are converted into, for example, NTSC composite color graphics characters by the built-in modulation circuit. Modulate to a signal and output to terminal (2
Output to 5).

The switches SW1 and SW2 are connected to the video signal detection circuit (2
The switch SW is turned on when the composite color video signal is obtained from the laser disk VCR (2), controlled by the detection output of 8), and the switch SW2 is turned on by the voltage-controlled oscillator (PLL) of the PLL circuit (33). If the composite color video signal cannot be obtained from the laser disk VCR (2), the switch SW1 is turned off and the switch SW2 is switched to the master clock oscillator (9).

Note that instead of the superimposed IC (16), the luminance signal Y, red color difference signal RY, and blue color difference signal BY of graphics from the amplifiers (21), (22), and (23) are, for example, Alternatively, a modulator for modulating the composite color graphics signal of the NTSC system may be provided.

Also, the digital primary color graphics signals R, G, B from the subcode decode IC (7) are supplied to D / A converters and amplifiers (13), (14), (15), and analog primary color graphics The signals are converted into signals R, G and B, amplified and supplied to the superimposed IC (16). The superimposed IC (16) uses its built-in conversion circuit (matrix circuit) to convert the primary colors. The graphics signals R, G, B are converted into a luminance signal Y, a red color difference signal RY,
The luminance signal Y, the red color difference signal RY, and the blue color difference signal BY are converted into a blue color difference signal BY, and the same external amplifiers (21), (22), and (23) as in FIG. After being amplified by the superimposing IC (16), the luminance signal Y of the graphics, the red color difference signal RY,
The blue difference signal BY may be modulated by the built-in modulation circuit into, for example, an NTSC composite color graphics character signal and output to the output terminal (25). In this case, the superimpose IC (16) may be provided with a chrominance subcarrier oscillator.

Further, instead of the laser disk video deck (2), another video signal reproducing device such as a VTR may be used.

According to the graphics character signal and color video signal synthesizing device of this embodiment, the subcode decoding IC and the RAM are compared with the graphics character signal and color video signal synthesizing device of the reference example of FIG. 7),
(8) and one each, and the D / A converter and amplifier are (1)
3), (14), and (15) are required.

〔The invention's effect〕

According to the graphics character signal and color video signal synthesizing device of the present invention described above, with a simple circuit configuration, when there is an input composite color video signal,
Simultaneously obtain an output composite color video signal obtained by synthesizing the primary color graphics character signal and the input composite color video signal from the decoding circuit and a modulated output composite color graphics signal of the primary color graphics character signal from the decoding circuit. be able to.

BRIEF DESCRIPTION OF THE 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) CD player, (2) laser disc VCR, (3) subcode decode IC control
CPU and error correction CPU (3), (4) are RAM, (7)
Is a subcode decode IC, (8) is a RAM, (9) is a master clock oscillator, (13), (14), and (15) are D / A, respectively.
Converters and amplifiers, (16) and (17) are superimposed ICs, (21), (22), and (23) are amplifiers, (2
4) and (25) are output terminals respectively, and (26) is a sync separation circuit (2
6) and (27) are waveform shaping circuits, (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)

(57) [Claims] And decoding said coded digital graphics character signal reproduced from a recording medium on which the coded digital audio signal and the coded digital graphics character signal related thereto are recorded. And decoding the primary color graphics character signal from the decoding means and an input composite color video signal reproduced from another recording medium, and converting the combined signal into an output composite color video signal. A superimposing means for converting the primary color graphics character signal from the decoding means into a luminance and color difference graphics character signal; and a primary color graphics character signal from the decoding means or luminance and color difference graphics from the superimposing means. Supply the character signal An output composite color graphics character signal; a composite encoding means; a clock oscillating means; and a PLL means for outputting a clock signal synchronized in phase with a horizontal synchronizing signal in the input composite color video signal. A graphics character signal and color video signal synthesizing device, wherein a clock signal from the PLL means and the clock oscillating means is switched and supplied to the decoding means in accordance with the presence or absence of a color video signal.