JP3460243B2 - Video signal processing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is suitable for application to, for example, inserting a karaoke character signal reproduced from CD-G software into a video signal for a background image. The present invention relates to a video signal processing device. Conventionally, there has been proposed a video system for superimposing karaoke characters on a background image by inserting a karaoke character signal reproduced from, for example, CD-G software into a video signal for a background image. . [0003] In a conventional video system, a background image 1 as shown in FIG.
0B is a karaoke character 10 for one screen as shown in FIG.
C is superimposed as it is to form a superimposed image as shown in FIG. 5A. Since the background image 10B is obstructed by the karaoke character 10C and the lack of image information increases, the image of the background image is increased. There was a problem that information was not sufficiently transmitted. Accordingly, an object of the present invention is to reduce the loss of image information of a background image due to karaoke characters or the like. [0005] A video signal processing apparatus according to the present invention comprises a phase difference providing means for providing a phase difference between horizontal and vertical synchronizing signals of the first and second video signals. A phase difference control means for continuously changing the phase difference applied by the phase difference providing means; a character extraction means for extracting a character extraction signal of a portion of the second video signal relating to character display ; Display position on horizontal position
First range selecting means for specifying a display range and a display range;
Specify the display position and display range on the vertical position of the
Second range selecting means, and a first video signal of the first video signal.
Corresponding to the position selected by the first or second range selection means
A first video signal based on the character extraction signal
Signal switching means for switching between the video signal and the second video signal
When a phase difference is provided between the horizontal synchronization signals of the first and second video signals by the phase difference providing means, in the horizontal direction of the image by the first video signal ,
In accordance with the position selected by the first range selection means,
The character signal is switched by the signal switching means.
Therefore, when the character portion is continuously changed in the horizontal direction, or when a phase difference is given between the vertical synchronization signals of the first and second video signals, the image of the image by the first video signal is changed.
At the position selected by the second range selection means in the vertical direction
Correspondingly, the character signal is switched off by the character signal switching means.
By switching, the character part is continuously and vertically
To change it . According to the present invention, the phase difference providing means provides
Horizontal (or vertical) synchronization of the first and second video signals
If a phase difference is provided between the first video signal
Of the horizontal (or vertical) direction of the image
The position selected by the first range selection means or the second selection means
In response to the above, the character signal is switched by the character signal switching means.
By switching, you can move the text horizontally (or
(Vertical direction) continuously. Thereby , an image, for example, a karaoke character, by the second video signal is horizontally or vertically scroll-displayed at a part of the image by the first video signal, and its display range in the scroll direction is determined by the first video signal. Since the image information corresponds to a partial position of the image, loss of image information in the scroll direction of the background image is reduced, and the image information of the background image can be sufficiently transmitted. An embodiment of the present invention will be described below with reference to FIG. In the figure, NT supplied to an input terminal 1
The SC video signal SV is supplied to a fixed terminal on the b side of the changeover switch 2. The video signal SV supplied to the input terminal 1 is supplied to a synchronization separation circuit 3, and the composite synchronization signal C / SYNC separated by the separation circuit 3 is supplied to a horizontal synchronization separation circuit 4, a vertical synchronization separation circuit 5, and an APC circuit. 6. The horizontal synchronization signal HD1 separated by the synchronization separation circuit 4 and the vertical synchronization signal VD1 separated by the synchronization separation circuit 5 are supplied to the controller 7. The center frequency of the video signal SV1 supplied to the input terminal 1 is fsc (fsc is the color subcarrier frequency).
Is supplied to the APC circuit 6 via the band pass filter 8 which is The APC circuit 6 extracts a color burst signal, and forms a color subcarrier signal SSC which is phase-synchronized with the color burst signal. The color subcarrier signal SSC output from the APC circuit 6 is supplied to an RGB encoder 10 via a phase adjuster 9. Reference numeral 11 denotes a CD (compact disk) as well-known CD-G software, and reference numeral 12 denotes an optical pickup. A signal reproduced from the CD 11 by the optical pickup 12 is supplied to a conventionally known digital signal processing circuit 13 for a CD. 13L and 13R are audio signal output terminals, and 13S is a data output terminal from which data of the subcode channels P to W is output. The data output terminal 13S of the signal processing circuit 13
Are supplied to the CD-G decoder 14. That is, the data of the channels P to W are supplied to the error detection / correction circuit 16 via the subcode interface 15 and subjected to error detection and correction processing, and then supplied to the display control circuit 17. Under the control of the display control circuit 17, the red, green, and blue data (R, G, B data) of each font constituting the screen of the karaoke character composed of the data of the channels R to W are stored in the RAM interface 18. , Are sequentially supplied to a RAM (display memory) 19 and sequentially stored at corresponding addresses. Clocks and timing signals required by the subcode interface 15, the error detection / correction circuit 16 and the display control circuit 17 are supplied from a timing control circuit 20. The timing control circuit 20 includes a synchronization signal generator. The horizontal synchronization signal HD2 output from the synchronization signal generator is supplied to the phase comparator 21. The horizontal synchronizing signal HD1 output from the synchronizing separation circuit 4 is supplied to the horizontal delay control circuit 22 and is delayed by a predetermined time under the control of the controller 7. The delay-controlled horizontal synchronization signal HD output from the delay control circuit 22
1 'is supplied to the phase comparator 21. The phase comparator 21 compares the phases of the horizontal synchronizing signals HD2 and HD1 '.
The comparison error signal output from the
Is supplied as an oscillation control signal to an oscillator constituting the synchronization generation section. As a result, the phase of the horizontal synchronization signal HD2 output from the synchronization generator of the timing control circuit 20 matches the phase of the horizontal synchronization signal HD1 '. The vertical synchronizing signal VD1 separated by the synchronizing separation circuit 5 is supplied to a vertical delay control circuit 23 and is delayed by a predetermined time under the control of the controller 7.
The delay-controlled vertical synchronization signal VD 1 ′ output from the delay control circuit 22 is supplied to the timing control circuit 20. In the timing control circuit 20, for example, the counter constituting the synchronizing signal generating section is reset by the vertical synchronizing signal VD1 '. To be matched. As described above, the R, G, B data of each font stored in the RAM 19 is stored in the display control circuit 17.
Is sequentially read out in synchronization with the horizontal and vertical synchronization signals output from the synchronization generation section of the timing control circuit 20. R output from the display control circuit 17,
The G and B data are supplied to the RGB encoder 10 after being converted into analog signals by the D / A converter 24. The encoder 10 is supplied with the composite synchronization signal C / SYNC output from the synchronization generator of the timing control circuit 20. In the encoder 10, the following processing is performed. First, a luminance signal and a color difference signal are obtained from a R, G, B data (analog signal) by a matrix circuit.
Next, for the luminance signal, a composite synchronizing signal C / SYNC is added, and for the chrominance signal, a well-known rectangular signal is used by using the color subcarrier signal SSC supplied from the APC circuit 6 to the encoder 10 via the phase adjuster 9. Carrier chrominance signals are formed by two-phase modulation. Next, the luminance signal and the carrier chrominance signal to which the synchronizing signal is added are synthesized, and the video signal SVCA
Is formed. The luminance signal Y formed in the encoder 10 is supplied to a character extracting circuit 25. In the character extracting circuit 25, a portion related to the display of the karaoke character is detected based on the level of the luminance signal Y, and a high-level character extracting signal SSE is formed corresponding to this portion. This character extraction signal SSE is supplied to the controller 7. A video signal SVCA for displaying karaoke characters output from the encoder 10 is supplied to a changeover switch 2.
Is supplied to the fixed terminal on the side a. Switching of the changeover switch 2 is controlled by the controller 7. Slide switches 26 and 27 for setting the display position (superimpose position) of the karaoke character with respect to the image based on the video signal SV are connected to the controller 7. In this case, the display position is determined by setting the switches 26 and 27 to the a side and the a side with respect to the background image by the video signal SV.
2 is set in the range of FIG. 2 when connected to the a side and the b side, and set in the range of FIG. 2 when connected to the a side and b side, respectively. The range is set, and when connected to the b side and the b side, respectively, the range is set to the range shown in FIG. In the controller 7, the logical product of the display position signal SPO which becomes high level corresponding to the above-mentioned display position and the character extraction signal SSE is obtained, and the output signal is supplied to the changeover switch 2 as the changeover control signal SSW. You. The changeover switch 2 is connected to the a side during a period when the signal SSW is at a high level, and is connected to the b side during other periods. Accordingly, the changeover switch 2 outputs a video signal SVout in which the karaoke character signal corresponding to the display position of the karaoke character is inserted into the video signal SV supplied to the input terminal 1, and this video signal SVout is buffered. It is led to an output terminal 29 via an amplifier 28. By supplying the video signal SVout to a monitor (not shown), the karaoke character can be superimposed at the display position of the karaoke character in the background image based on the video signal SV. As described above, the delay time in the delay control circuits 22 and 23 is controlled by the controller 7, and this delay time is controlled in accordance with the setting of the display position of the karaoke character. When the display position is set to or within the range, the delay time in the delay control circuit 22 is set to 0, and the delay time in the delay control circuit 23 is changed continuously. Also, when the display position is set to or within the range, the delay control circuit 2
2, the delay time in the delay control circuit 23 is set to zero. The controller 7 is connected to a volume 30 for setting the change speed of the delay time. In this embodiment, since the delay time in the delay control circuit 22 or 23 is continuously changed, the karaoke character is displayed at the display position of the karaoke character set by the slide switches 26 and 27 in the horizontal direction. Or scroll vertically. The scroll display will be described below with reference to the waveform diagram of FIG. It is assumed that the display position of the karaoke character is set in the range of. When the video signal SV supplied to the input terminal 1 is as shown in FIG. 3A, the horizontal synchronization signal HD1 separated by the synchronization separation circuit 4 becomes as shown in FIG. The output horizontal synchronizing signal HD1 'is delayed from the horizontal synchronizing signal HD1 by T0 as shown in FIG. Since the horizontal synchronizing signal HD1 'output from the delay control circuit 22 is supplied to the phase comparator 21, the phase of the horizontal synchronizing signal HD2 output from the synchronization generator of the timing control circuit 20 is as shown in FIG. As shown, the phase coincides with the phase of the horizontal synchronizing signal HD1 '. Since the R, G, B data of each font stored in the RAM 19 of the decoder 14 is read out in synchronization with the horizontal synchronizing signal HD2, the video signal SVCA for displaying karaoke characters formed by the encoder 10 is shown in FIG. As shown in E.
Although the waveform of the video signal SVCA actually corresponds to the character shape, the karaoke character portion is indicated by a straight line for the sake of simplicity. A character extracting signal SSE is output from the character extracting circuit 25 as shown in FIG. 9F, and a display position signal SPO indicating the display position becomes as shown in FIG. 10G. The supplied switching control signal SSW is as shown in FIG. Therefore, the changeover switch 2 outputs a video signal SVout in which the karaoke character signal is inserted into the video signal SV corresponding to the display position of the karaoke character as shown in FIG. FIG. 5B shows an image based on the video signal Sout, and the karaoke character 10C is superimposed at the display position of the background image 10B. Similarly, when the delay time in the delay control circuit 22 is T1 and T2 as shown by the broken line in FIG. 3C, the video signal SVout output from the changeover switch 2
Are as shown in FIGS. Therefore, the delay time in the delay control circuit 22 is T0 → T1 →
By continuously changing the delay time such as T2 →..., A horizontal scroll display is performed from the right end to the left end of the karaoke character screen. In this case, the scroll speed can be changed by changing the change speed of the delay time by the volume 30. After scrolling and displaying the left end of the karaoke character screen, the delay time in the delay control circuit 22 is returned to the initial value T0, and the display state of the right end is returned. Similarly, when the display position of the karaoke character is set in the range, the karaoke character screen is horizontally scroll-displayed at the display position. On the other hand, although the detailed description is omitted, when the display position of the karaoke character is set in or range, the karaoke character screen is vertically scrolled from the upper end to the lower end. As described above, in the present embodiment, the video signal S
Since the karaoke characters are scroll-displayed at the display position of the background image 10B by V, all the karaoke characters can be displayed at this display position, and the lack of image information of the background image 10B due to the karaoke characters can be reduced. is there. In the above embodiment, the input terminal 1
The horizontal synchronization phase or the vertical synchronization phase of the video signal SVCA output from the encoder 10 is controlled on the basis of the video signal SV supplied to the
The horizontal synchronization phase or the vertical synchronization phase of the video signal SV may be controlled based on the video signal SVCA. In short, scroll display is possible by continuously changing the relative phase difference between horizontal synchronization and vertical phase between the video signals SV and SVCA. In the above-described embodiment, an example is shown in which karaoke characters are scroll-displayed on an image based on the video signal SV. However, the present invention is not limited to karaoke characters, and other characters or general images are similarly scroll-displayed. Can be. According to the present invention, the phase difference providing means is provided.
The horizontal (or vertical) of the first and second video signals
When a phase difference is given between the synchronization signals of the first
The horizontal (or vertical) direction of the image
That is, the selection is made by the first range selection means or the second selection means.
Corresponding to the position
By switching the signal, the character part is moved horizontally.
(Or vertical) continuously .
An image based on the second video signal, for example, a karaoke character is horizontally or vertically scroll-displayed at a part of the image based on the first video signal, and its display range in the scroll direction is one of the image based on the first video signal. Since the image information corresponds to the position of the copy, the loss of image information in the scroll direction of the background image is reduced, and the image information of the background image can be sufficiently transmitted.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a video signal processing device according to the present invention. FIG. 2 is a diagram for explaining setting of a display position of a karaoke character in the embodiment. FIG. 3 is a diagram for explaining scroll display in the embodiment. FIG. 4 is a diagram showing an example of a background image and a karaoke character screen. FIG. 5 is a diagram showing a superimposed state of karaoke characters in the conventional example and the embodiment. [Description of Signs] 2 Changeover switch 3 Sync separation circuit 4 Horizontal sync separation circuit 5 Vertical sync separation circuit 6 APC circuit 7 Controller 8 Band pass filter 9 Phase adjuster 10 RGB encoder 11 Compact disk (CD) 12 Optical pickup 13 Digital signal Processing circuit 14 CD-G decoder 17 Display control circuit 19 RAM (display memory) 20 Timing control circuit 21 Phase comparator 22 Horizontal delay control circuit 23 Vertical delay control circuit 25 Character extraction circuit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H04N 5/262-5/28 G10K 15/01 302 G11B 27/34

Claims (1)

(57) [Claim 1] A phase difference providing means for providing a phase difference between horizontal or vertical synchronization signals of the first and second video signals, and the phase difference providing means provides the phase difference. a phase difference control means for continuously changing the phase difference, the character of the portion relating to the display of the characters of the second video signal
Character extracting means for extracting a sampling signal, and a display position and a display range on a horizontal position of the video signal
Range selection means for specifying the video signal, a display position and a display range on a vertical position of the video signal
Second range selecting means for specifying the first or second range of the first video signal.
Select the characters above to correspond to the position selected by the selection means.
The first video signal and the second video signal based on the
And a character signal switching unit for switching between the first video signal and the second video signal when the phase difference is provided between the horizontal synchronization signals of the first and second video signals. Horizontal shift of image by video signal
That is, corresponding to the position selected by the first range selecting means.
Switch the character signal by the character signal switching means.
Characters to change the character part continuously in the horizontal direction.
Is on or above when the phase difference between the vertical synchronizing signals of the first and second video signal is applied, of the vertical direction of the image by the first video signal, said second range select hand,
The character signal switching procedure described above corresponds to the position selected in the step.
By switching the character signal by the step, the character part
A video signal processing device characterized by continuously changing the minutes in the vertical direction .