JPH0543673U - Video signal processing circuit - Google Patents

Abstract

(57) [Abstract] [Object] The present invention relates to a video signal processing circuit used in an image reproducing apparatus having a display with an aspect ratio of 16: 9. In particular, the position of the subtitle supermarket such as movie software can be moved, and the aspect ratio 1 without loss of video and subtitle supermarket
It is intended to provide a circuit capable of obtaining a 6: 9 image. [Structure] Subtitle memory 11 and subtitle memory controller
The subtitle super moving circuit 2 composed of 12 and the mixer 13 moves the subtitle super into the video signal area. Further, the scanning line interpolation unit 3 including the image memory 15, the scanning line interpolation circuit 16, and the image memory controller 17 performs screen expansion in the vertical direction, and an image with an aspect ratio of 16: 9 without loss of video and subtitles. To obtain a video signal.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a video signal processing circuit used in an image reproducing apparatus having a display with an aspect ratio of 16: 9. Further, the present invention particularly aims to provide a video signal processing circuit capable of moving the position of the curtain of movie software or the like.

[0002]

[Prior Art]

 At present, a general television (TV) receiver has a display with an aspect ratio of 4: 3, and uses an NTSC signal as a signal source for display without adding temporal compression or expansion processing to the original signal. The video signal is playing on top. On the other hand, a TV receiver (hereinafter also referred to as a wide TV) equipped with a display with an aspect ratio of 16: 9, which has recently appeared, performs optimum time base processing on an original signal according to a signal source. There is a need. In particular, if the incoming original signal is a 16: 9 Vista image masked in black at the top and bottom (shown as white bands in the drawing) as shown in FIG. If the time axis processing is not performed, the image on the screen of the wide TV will be horizontally stretched as shown in FIG. 2 (c). Therefore, in wide TV, by expanding the screen by 4/3 in the vertical direction, the 16: 9 display is fully used, and the true signal equivalent to the input signal as shown in FIG. 2 (b) is used. An image having circularity is displayed.

[0003]

[Problems to be solved by the device]

 The screen expansion of 4/3 times is performed by expanding the vertical scanning amplitude to 4/3 times. However, in the full-screen display shown in FIG. 2B, if the subtitle super is inserted in the lower part of the video signal (the part masked with black), the subtitle will disappear. There was a problem. Therefore, when the subtitle superimposes in the lower part where there is no video signal, the center of vertical scanning is displaced upward to display the subtitle superimpose. However, this method causes a new problem that the upper image part is missing.

Furthermore, since the screen is expanded and the vertical display position of the screen is switched by the vertical scanning system, immediately after the position switching, the vertical vibration of the image and the bound scroll (temporary disturbance of vertical synchronization). Occasionally, the quality of the displayed image may deteriorate.

The problem to be solved by the present invention is to enable full-screen display on a display with an aspect ratio of 16: 9 without loss of video and subtitle superimpose, and further, when switching the display position of the subtitle super. The point is what kind of measures should be taken to make a video signal processing circuit that does not deteriorate in quality.

[0006]

[Means for Solving the Problems]

 Therefore, in order to solve the above-mentioned problems, the present invention is a video signal processing circuit used in an image reproducing apparatus having a display with an aspect ratio of 16: 9, which converts an incoming video signal into a digital video signal. A / D converter, a first memory to which the digital video signal is supplied from the A / D converter, and which writes caption information; and a first memory which writes caption information in the digital video signal. And a first control circuit for controlling the first memory so as to delay the written subtitle information by a predetermined time and read the output signal of the first memory. A mixer for mixing with a video signal, a second memory for writing the output signal of the mixer, a write operation for the second memory, and reading the written information with a delay of a predetermined time. Yo A second control circuit for controlling the second memory; a scanning line interpolation circuit to which an output signal of the second memory is supplied; and a D converting the output signal of the scanning line interpolation circuit into an analog video signal. An A / A converter is provided to provide a video signal processing circuit.

[0007]

Embodiment An embodiment of the present invention is shown in FIG. FIG. 1A is a block diagram of an embodiment, FIG. 1B is a block diagram of the subtitle super moving circuit, and FIG. 1C is a block diagram of the scanning line interpolation unit.

As shown in FIG. 1 (a), the video signal in the Vista mode coming into the input terminal 5 is converted into a digital video signal by the A / D converter 1 and supplied to the subtitle super moving circuit 2. .. The subtitle super moving circuit 2 moves the position of the subtitle super into the Vista size video information area, and supplies the output to the scanning line interpolating unit 3. The scanning line interpolating unit 3 performs scanning line interpolation so as to display a full screen on a display having an aspect ratio of 16: 9 while maintaining the circularity, and supplies the output to the D / A converter 4. The D / A converter 4 converts the digital video signal into an analog video signal, and the analog video signal is sent to the output terminal 6. If the signal obtained from the output terminal 6 is reproduced on a display with an aspect ratio of 16: 9, as shown in FIG. No image is obtained. Reference numeral 10 is a synchronous signal input terminal.

Next, the configuration and operation of the subtitle super moving circuit 2 will be described with reference to FIG. The digital video signal having the Vista size video information and the subtitle information outside the area, which is supplied from the A / D converter 1, is input to the subtitle memory 11 (first memory). The subtitle memory 11 is controlled by the subtitle memory controller 12 (first control circuit) to write subtitle information. Then, the subtitle memory 11 is controlled by the subtitle memory controller 12, delays the written subtitle information for a predetermined time, and outputs the delayed subtitle information to the mixer 13. This delay time determines the moving position of the subtitle supermarket. In the mixer 13, the caption information read from the caption memory 11 is superimposed in the Vista size video information area of the digital video signal, and the output of the mixer 13 is supplied to the scanning line interpolation unit 3. The caption memory controller 12 performs control operation according to the signal from the sync signal input terminal 10.

In the scanning line interpolating unit 3 shown in FIG. 1C, the output of the mixer 13 (a video signal in which caption information is superimposed in the Vista size video information area) is first stored in the image memory 15 (second Memory). The image memory 15 is controlled by the image memory controller 17 (second control circuit) to sequentially write at least the video information in the Vista size area. Then, the image memory 15 is controlled by the image memory controller 17 to read the video information at a speed of 3/4 of the writing speed and supply the output to the scanning line interpolation circuit 16. The scanning line interpolation circuit 16 performs scanning line interpolation to obtain a video signal which is screen-expanded by 4/3 times in the vertical direction. When this video signal is reproduced, the image shown in FIG. 2 (e) is obtained. In this description, only the scanning line interpolating unit having a vertical screen expansion ratio of 4/3 is provided, but when the screen expansion ratio is changed according to the input signal source, the scanning line interpolating unit is provided with a horizontal line. A scan line interpolation circuit may be combined.

As described above, in this embodiment, since the subtitle superimposition can be superimposed in the Vista-size video area, an image having an aspect ratio of 16: 9 without loss of the video and subtitle superimpose can be obtained. Further, in the present embodiment, since the process of moving the subtitle super and the screen expansion are not performed by the vertical scanning system, the subtitle super can be moved without deterioration of image quality. Further, this embodiment is also suitable for an image reproducing apparatus such as a liquid crystal projection in which the screen cannot be expanded in the vertical scanning system.

Here, since the subtitle super moving circuit 2 and the scanning line interpolating unit 3 both involve a time shift, it is optimal to realize them by a digital signal processing circuit using a memory as shown in the embodiment. .. Also, by arranging the moving circuit 2 of the subtitle supermarket and the scanning line interpolating unit 3 in close proximity to each other, the number of A / D converters and D / A converters can be minimized, and necessary clocks can be shared. There is an advantage in that it is possible to implement common countermeasures against EMI (electromagnetic interference).

[0013]

[Effect of the device]

 As described above, the video signal processing circuit according to the present invention can superimpose a subtitle super in the video area, and thus an image with an aspect ratio of 16: 9 can be obtained without loss of the video and subtitle. Further, since this video signal processing circuit does not perform the moving process of the subtitle super or the screen expansion in the vertical scanning system, the subtitle super can be moved without deterioration of image quality.

[Brief description of drawings]

FIG. 1 is a diagram showing an example.

[Fig. 2] Vista-size video signal source and aspect ratio 1
It is explanatory drawing with the screen displayed on the display of 6: 9.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 A / D converter 2 Subtitle super moving circuit 3 Scan line interpolator 4 D / A converter 5 Input terminal 6 Output terminal 10 Sync signal input terminal 11 Subtitle memory (first memory) 12 Subtitle memory controller (No. 1 control circuit) 13 mixer 15 image memory (second memory) 16 scanning line interpolation circuit 17 image memory controller (second control circuit)

Claims (1)

[Scope of utility model registration request] 1. A video signal processing circuit used in an image reproducing apparatus having a display with an aspect ratio of 16: 9, which is an A / D for converting an incoming video signal into a digital video signal.
A converter, a first memory to which the digital video signal is supplied from the A / D converter, and which writes subtitle information; and a first memory which controls the first memory to write subtitle information in the digital video signal. And a first control circuit for controlling the first memory so as to delay the written subtitle information by a predetermined time and read the output signal of the first memory to the digital video signal. A mixer for mixing, a second memory for writing an output signal of the mixer, a write operation of the second memory, and a function of delaying the written information by a predetermined time and reading the information. Second
Second control circuit for controlling the memory, a scanning line interpolation circuit to which the output signal of the second memory is supplied, and a D / A converter for converting the output signal of the scanning line interpolation circuit into an analog video signal A video signal processing circuit characterized by comprising the following.