JP2002247601A - Video signal processing unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a video signal processing unit, that allows a high vision monitor to be able to correctly display a noninterlace scanning video signal output, even when the output is connected to the monitor. SOLUTION: In the video signal processing unit, that provides an output of a noninterlace scanning video signal comprising a luminance signal and two color difference signals, a user instructs operations of a variable delay circuit 8 receiving the output of a noninterlace scanning video signal conversion circuit 7, and an output from a control circuit 12 receiving a signal from a horizontal display position setting circuit 11 to delay an image display position, with respect to a horizontal synchronizing signal and to insert a signal corresponding to a black level to the delayed luminance signal and a signal equivalent to achromatic color signal to the delayed two color difference signals.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a tape medium or a disk medium (DVD disk, hard disk, etc.)
Video signals recorded on a recording medium or a storage medium of a semiconductor memory, or video information such as a satellite broadcast or a terrestrial broadcast are transferred and converted into an interlaced scan video signal or a progressive scan video signal and output. The present invention relates to a video signal processing device.

[0002]

2. Description of the Related Art Conventionally, a video signal recorded on a recording medium such as a tape medium or a disk medium or a storage medium of a semiconductor memory, or a video output such as a satellite broadcast, a cable broadcast or a terrestrial broadcast is reproduced by a television receiver. So that you can
Normally, the video signal is transmitted as a composite video signal.
With the widespread use of video equipment to which the PEG compression technique is applied, a video signal processing device for transmitting a video signal using an interlaced color difference signal or a progressive color difference signal is being introduced.

FIG. 6 is a block diagram showing a configuration of a video signal processing apparatus for reproducing a video signal recorded on a disk as a conventional example of the technology relating to the present invention.
In FIG. 6, reference numeral 1 denotes a disk in which a color difference video signal is encoded in advance in a signal form suitable for recording (or reproduction), modulated, and recorded. A pickup 2 converts an information signal recorded on the disk 1 into an electric signal. 3
Is a disk rotating device for rotating the disk 1 at a rotational speed suitable for reproduction. Reference numeral 4 denotes an interlaced scanning video signal reproducing circuit which demodulates and decodes the video signal recorded on the disk 1 and outputs it as an interlaced scanning video signal. Reference numeral 5 denotes an encoder which monitors an interlaced scanning video signal (not shown).
The video signal is converted to a video signal suitable for output. Reference numeral 6 denotes an interlaced scanning video signal output terminal from which an interlaced scanning video output reproduced from this terminal is output to a monitor (not shown). Reference numeral 7 denotes a progressive scanning video signal conversion circuit which converts an input interlaced scanning video signal into a progressive scanning video signal and outputs the signal. A color difference converter 9 converts a progressively scanned video signal into a video signal suitable for a progressive scan monitor (not shown) and outputs the video signal. 1
Reference numeral 0 denotes a progressive scan video output terminal, from which the progressive scan video output reproduced is output to a progressive scan monitor (not shown). Reference numeral 13 denotes a progressive scanning video synchronizing signal generation circuit which generates a progressive scanning video synchronizing signal.

The operation of the conventional video signal processing device configured as described above will be described.

FIG. 7 is a schematic diagram showing a signal structure of a video signal output from a conventional video signal reproducing apparatus. In the interlaced scanning video signal, an image of one field is formed in 1/60 second, and two images are combined to form an image of one frame. The number of vertical pixels in each of the two fields is 240, and the pixels are arranged so as to fill the space between the pixels in the vertical direction. On the other hand, in the progressive scanning video signal, one frame is 1/60 second and the number of vertical pixels is 480. As described above, the vertical frequency is 1/60 second, and the number of horizontal scanning lines is twice as large as that of the interlaced scanning video signal. Therefore, the horizontal scanning frequency is about 15.75 KHz for the interlaced scanning video signal. On the other hand, in the progressive scanning video signal, it is about 31.5 KHz.

In FIG. 6, when a disk 1 is rotated at a rotational speed suitable for reproduction by a disk rotating device 3, a pickup 2 reads an optical signal recorded on the disk 1 and converts it into an electric signal. The interlaced scanning video signal reproducing circuit 4 converts the given electrical signal into a digital color difference signal and outputs the signal.

[0007] The encoder 5 converts the digital video signal reproduced as described above into an interlaced video signal suitable for outputting to a monitor (not shown). That is, a synchronizing signal is added to a digitally input luminance signal, the signal is output as an analog signal, and two color difference signals of CB and CR are also converted into analog signals and output. Also,
A chrominance signal modulated by a chrominance subcarrier is created from the two signals CB and CR, and a chrominance signal, a luminance signal, and a synchronizing signal are combined to generate a composite video signal. The analog luminance signal, color difference signal, color signal, and composite video signal thus generated are output from the interlaced scanning video signal output terminal 6. The progressive scanning video signal conversion circuit 7 converts the output of the interlaced scanning video signal reproducing circuit 4 into a progressive scanning video signal. The color difference converter 9 converts the output of the progressive scanning video signal conversion circuit 7 into a progressive scanning video signal suitable for outputting an image to a progressive scanning monitor (not shown). That is, a synchronizing signal generated by the progressive scanning video synchronizing signal generation circuit 13 is added to the digitally input luminance signal, and the resultant signal is output as an analog signal. The two color difference signals of PB and PR are also converted to analog signals. Output from the progressive scanning video output terminal 10.

FIG. 8 is a diagram showing the timing of a video signal of a conventional video signal processing device.

As described above, the video signal output from the progressive scanning video signal output terminal has 480 vertical pixels and 525 frame lines (hereinafter 480P).
). The 480P video signal is correctly displayed by being input to a monitor conforming to the 480P video signal.

[0010] The horizontal scanning of 480P in FIG. 8A shows a video signal over one horizontal period of the progressively scanned video signal. On the other hand, the number of scanning lines is 113
FIG. 8 (b) Hi-Vision horizontal scanning in which five progressively scanned video signals (hereinafter referred to as Hi-Vision) have been used indicates a video signal over one horizontal scanning period of the Hi-Vision signal. As shown in FIG. 8, the 480P signal has a horizontal frequency of 31.5 KHz and is a binary synchronization signal, whereas the HDTV signal has a horizontal frequency of 34 KHz and is a ternary synchronization signal.

FIG. 9 is a schematic diagram showing image output positions on a variety of monitors of a progressively scanned image of a conventional image signal processing device.

FIG. 9 (e) shows an image position on the 480P monitor showing a 480P video signal correctly displayed on the 480P monitor. This is the same display position as when a progressive scanning video signal is displayed on a conventional progressive scanning video signal monitor. On the other hand, in many cases, the HDTV monitor can synchronize with the 480P video signal. This is because the vertical synchronizing signal is 480P and HDTV is 60Hz for both, and the horizontal cycle is also 480P is 31.5KHz and HDTV is close to 34KHz. However, when a 480P video signal is input to the HDTV monitor, FIG.
As shown in the image position on the HDTV monitor, 48
As compared with the case where an image is displayed on the 0P monitor, there is a problem that the display position is shifted to the left, the left end of the image is out of the screen, and a non-image portion (black) appears at the right end. 31.5 against the output timing designed for
This is due to the fact that the position shifts because a KHz signal is input. On the other hand, in the monitor, a clamp operation is performed in order to determine the reference of the luminance of the input video signal due to its circuit characteristics.
It is assumed that. As shown in FIG. 8, since the blank period is different between the HDTV signal and the 480P signal, when the 480P signal is input to the HDTV monitor, the clamp operation is not performed correctly when the left end of the image is white because the 480P signal is clamped during the image period. , Correct brightness is not reproduced.

[0013]

As described above, in the conventional video signal processing apparatus, when the progressive scanning video signal output is connected to the high-vision monitor, the interlaced scanning video signal is connected to the interlaced scanning video monitor. There is a problem that the display position is different from that in the case where the display is performed, and that a correct display cannot be performed due to a malfunction of the clamp circuit inside the monitor. In the future, there is a demand for an inexpensive and simple video signal processing device capable of correctly displaying a progressively scanned video signal even when the output is connected to a high-vision monitor.

The present invention solves the above-mentioned problems of the prior art, and delays the image display position with respect to the horizontal synchronizing signal in the progressive scanning video signal output according to a user's instruction, and turns black the delayed portion of the luminance signal. By inserting a corresponding signal and inserting a signal corresponding to an achromatic color into the delayed portion of the two color difference signals, the interlaced scanning video signal can be output even when the progressive scanning video signal output is connected to a high-vision monitor. It is an object of the present invention to provide a video signal processing device capable of performing display at the same display position as when connected to an interlaced scanning video monitor and capable of generating a progressive scanning video signal without malfunction of a clamp circuit inside the monitor.

[0015]

SUMMARY OF THE INVENTION In order to solve this problem, the present invention is directed to a video signal processing apparatus for outputting a progressively scanned video signal consisting of an interlaced video signal, a luminance signal and two color difference signals, The image display position with respect to the horizontal synchronizing signal in the progressive scanning video signal output is delayed, and a signal corresponding to black is inserted into a delayed portion of the luminance signal, and a signal corresponding to achromatic color is inserted into a delayed portion of the two color difference signals. This is a video signal processing device provided with an image position control unit to be inserted.

With this arrangement, even when the progressive scan video signal output is connected to a high-vision monitor, it is possible to display at the same display position as when the interlaced scan video signal is connected to the interlaced scan video monitor. , It is possible to generate a sequential scanning video signal without malfunction of the clamp circuit.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (Embodiment 1) Hereinafter, Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 5 in the case of reproducing a signal recorded on a disc.

FIG. 1 is a block diagram showing the configuration of the video signal processing device according to the first embodiment of the present invention. In FIG.
Reference numeral 1 denotes a disc on which a color difference video signal is encoded in advance in a signal form suitable for recording (or reproduction), modulated, and recorded. A pickup 2 converts an information signal recorded on the disk 1 into an electric signal. Reference numeral 3 denotes a disk rotating device which rotates the disk 1 at a rotation speed suitable for reproduction. Reference numeral 4 denotes an interlaced scanning video signal reproducing circuit.
, Demodulates and decodes the video signal recorded in, and outputs it as an interlaced video signal. Reference numeral 5 denotes an encoder which converts an interlaced scanning video signal into a video signal suitable for a monitor (not shown) and outputs the video signal. Reference numeral 6 denotes an interlaced scanning video signal output terminal from which an interlaced scanning video output reproduced from this terminal is output to a monitor (not shown). Reference numeral 7 denotes a progressive scanning video signal conversion circuit which converts an input interlaced scanning video signal into a progressive scanning video signal and outputs the signal. Reference numeral 8 denotes a variable delay circuit which gives an input video signal a delay of a delay time determined by the control circuit 12 and outputs the video signal. 9 is a color difference converter.
The progressive scanning video signal is converted into a video signal suitable for a progressive scanning monitor (not shown) and output. Reference numeral 10 denotes a progressive scanning video output terminal, from which the progressive scanning video output reproduced from the terminal is output.
It is output to a progressive scanning monitor (not shown). 11 is
Horizontal display position setting means, the user uses this means,
The horizontal display position of the progressive scanning video signal is set. A control circuit 12 controls the amount of delay of the variable delay circuit 8 in accordance with the output of the horizontal display position setting means 11 and the output timing of the sequential scanning video synchronizing signal generation circuit 13. Reference numeral 13 denotes a progressive scanning video synchronizing signal generation circuit which generates a progressive scanning video synchronizing signal.

The operation of the video signal processing apparatus according to the first embodiment of the present invention configured as described above will be described.

FIG. 2 is a schematic diagram showing a signal structure of a video signal output from the video signal reproducing device according to the first embodiment of the present invention. In the interlaced scanning video signal, an image of one field is formed in 1/60 second, and two images are combined to form an image of one frame. The number of vertical pixels in each of the two fields is 240, and the pixels are arranged so as to fill the space between the pixels in the vertical direction. On the other hand, in the progressive scanning video signal, one frame is 1/60 second and the number of vertical pixels is 480.
It is. As described above, the vertical frequency is 1/60 second, and the number of horizontal scanning lines is twice as large as that of the interlaced scanning video signal. Therefore, the horizontal scanning frequency of the interlaced scanning video signal is about 15.75 KHz. On the other hand, in the progressive scanning video signal, it is about 31.5 KHz.

In FIG. 1, when the disk 1 is rotated at a rotational speed suitable for reproduction by a disk rotating device 3, a pickup 2 reads an optical signal recorded on the disk 1 and converts it into an electric signal. The interlaced scanning video signal reproducing circuit 4 converts the given electrical signal into a digital color difference signal and outputs the signal.

The encoder 5 converts the digital video signal reproduced as described above into an interlaced video signal suitable for outputting to a monitor (not shown). That is, a synchronizing signal is added to a digitally input luminance signal, the signal is output as an analog signal, and two color difference signals of CB and CR are also converted into analog signals and output. Also,
A chrominance signal modulated by a chrominance subcarrier is created from the two signals CB and CR, and a chrominance signal, a luminance signal, and a synchronizing signal are combined to generate a composite video signal. The analog luminance signal, color difference signal, color signal, and composite video signal thus generated are output from the interlaced scanning video signal output terminal 6. The progressive scanning video signal conversion circuit 7 converts the output of the interlaced scanning video signal reproducing circuit 4 into a progressive scanning video signal. The color difference converter 9 converts the output of the progressive scan video signal conversion circuit 7 into a progressive video signal suitable for outputting an image to a progressive scan monitor (not shown). That is, a synchronizing signal generated by the progressive scanning video synchronizing signal generation circuit 13 is added to the digitally input luminance signal, and the resultant signal is output as an analog signal. The two color difference signals of PB and PR are also converted to analog signals. Output from the progressive scanning video output terminal 10.

FIG. 3 is a diagram showing the timing of the video signal of the video signal processing device according to the first embodiment of the present invention.

As described above, the video signal output from the progressive scanning video signal output terminal has 480 vertical pixels and 525 frame lines, ie, 480P.
It is. The 480P video signal is correctly displayed by being input to a monitor conforming to the 480P video signal.

The horizontal scanning of 480P in FIG. 3A shows a video signal over one horizontal cycle of the progressively scanned video signal. On the other hand, the number of scanning lines is 113
The horizontal scanning of the high-definition television shown in FIG. 3B, in which five high-definition televisions have been used, shows a video signal over one horizontal scanning period of the high-definition signal. As shown in FIG.
The 80P signal has a horizontal frequency of 31.5 KHz, which is a binary synchronization signal, whereas the HDTV signal has a horizontal frequency of 34 KHz, which is a ternary synchronization signal.

FIG. 4 is a diagram showing the timing of setting the horizontal display position of the video signal processing device according to the first embodiment of the present invention.

FIG. 5 is a schematic diagram showing image output positions on the various monitors of the progressive scanning image of the image signal processing device according to the first embodiment of the present invention.

FIG. 5E shows the image position on the 480P monitor showing the 480P video signal correctly displayed on the 480P monitor. This is the same display position as when a progressive scanning video signal is displayed on a conventional progressive scanning video signal monitor. On the other hand, in many cases, the HDTV monitor can synchronize with the 480P video signal. This is because the vertical synchronization signal is 480P and HDTV is 60Hz, and the horizontal period is 480P is 31.5KHz and HDTV is close to 34KHz. However, when a 480P video signal is input to the HDTV monitor, FIG. As shown in the image position on the HDTV monitor, the display position is shifted to the left, the left end of the image goes out of the screen, and a non-image portion (black) appears at the right end, as compared with the case where the image is displayed on the 480P monitor. A problem arises, which is originally 34
This is due to the fact that the position shifts because a 31.5 KHz signal is input with respect to the image output timing designed for KHz horizontal synchronization. On the other hand, in the monitor, a clamp operation is performed in order to determine the reference of the luminance of the input video signal due to its circuit characteristics. The clamp operation is performed by using the voltage in the blanking period immediately after the horizontal synchronization signal (that is, the black level). It is assumed that. HDTV signal and 4
As shown in FIG. 5, when the 480P signal is input to the high-definition monitor, the clamp operation is not performed correctly when the left end of the image is white. Is not reproduced.

In FIG. 1, the user instructs the horizontal display position setting means 11 to change the horizontal display position in order to correctly display the progressively scanned video signal on the high definition monitor. The control circuit 12 synchronizes with the horizontal synchronizing signal of the progressively scanned video synchronizing signal generating circuit 13 in accordance with the horizontal display position instruction obtained from the horizontal display position setting means 11 and sends a timing signal representing the start position of the video signal to the variable delay circuit 8. give. The variable delay circuit 8 delays the output of the progressive scanning video signal conversion circuit 7 according to the timing signal given by the control circuit 12 and inputs the delayed output to the color difference converter 9. As a result, in FIG. 4, the horizontal display position conventionally represented by (c) the horizontal output before the display position is corrected is now represented by (d) the horizontal output after the display position is corrected.

As a result, the image position moves to the right with respect to the horizontal synchronization signal, and the blanking period immediately after the synchronization signal is extended. During the blanking period, the luminance signal has a black level, and the two color difference signals (not shown) have a level corresponding to an achromatic color. When the video signal whose display position has been changed in this way is output to the HDTV monitor, as shown in FIG. 5 (g), the image position on the HDTV after the display position is corrected, FIG. The display position can be the same as the image position on the monitor.
In addition, the clamp position of the high-vision monitor is correctly set to black or achromatic color without application of a video signal, so that luminance and color can be correctly reproduced.

That is, according to the video signal processing apparatus of the first embodiment of the present invention, the video signal processing apparatus is provided with the horizontal display position setting means, the control circuit and the variable delay circuit, and displays the image for the horizontal synchronizing signal according to the setting of the user. By sequentially delaying the position according to a user's instruction, inserting a signal corresponding to black into a delayed portion of the luminance signal, and inserting a signal corresponding to achromatic color into a delayed portion of the two color difference signals, thereby sequentially scanning. Even when the video signal output is connected to a high-definition monitor, it is possible to display at the same display position as when the interlaced scanning video signal is connected to the interlaced scanning video monitor, and there is no malfunction of the clamp circuit inside the monitor A video signal processing device capable of generating a progressive scanning video signal can be provided.

In the video signal processing apparatus according to the first embodiment, the horizontal display position is set in two stages of the presence or absence of a delay. The effect remains the same.

In the first embodiment, the progressive scan video signal and the interlaced scan video signal are output from independent video output terminals, respectively. It is also possible to adopt a configuration of outputting from a video signal output terminal.

Further, in FIG. 1 and subsequent figures, each of the constituent elements following reference numeral 4 is in the form of a circuit in the present embodiment, but these can be replaced by software.

Further, in the present embodiment, the description has been made with respect to a video signal recorded on a disk medium, but this is also applicable to information signals including video signals of other tape media, satellite broadcasting, terrestrial broadcasting and the like. Can be applied in the same way.

[0036]

As described above, according to the present invention, the image display position with respect to the horizontal synchronizing signal in the progressive scanning video signal output is delayed by the instruction of the user, and the signal corresponding to black is added to the delayed portion of the luminance signal. , And an image position control means for inserting a signal corresponding to an achromatic color into a delayed portion of two color difference signals, so that when a progressively scanned video signal output is connected to a high-definition monitor, it can be skipped. It is possible to provide a video signal processing device capable of displaying a scan video signal at the same display position as when connected to an interlaced scan video monitor and generating a progressive scan video signal without malfunction of a clamp circuit inside the monitor. it can.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a video signal processing device according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing a signal structure of an output video signal.

FIG. 3 is a diagram showing timing of a video signal according to the embodiment;

FIG. 4 is a diagram showing timing of setting a horizontal display position.

FIG. 5 is a schematic diagram showing image output positions of various progressive scan images on various monitors.

FIG. 6 is a block diagram showing a configuration of a conventional video signal processing device.

FIG. 7 is a schematic diagram showing a signal structure of an output video signal.

FIG. 8 is a diagram showing the timing of the video signal.

FIG. 9 is a schematic diagram showing image output positions of various progressive scan images on various monitors.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 disc 2 pickup 3 disc rotating device 4 interlaced scanning video signal reproducing circuit 5 encoder 6 interlaced scanning video signal output terminal 7 progressive scanning video signal conversion circuit 8 variable delay circuit 9 color difference converter 10 progressive scanning video output terminal 11 horizontal display position setting means 12 control circuit 13 progressive scan video synchronization signal generation circuit

Claims (4)

[Claims] 1. An interlaced scanning video signal, a luminance signal and 2
What is claimed is: 1. A video signal processing device for outputting a progressive scanning video signal comprising two color difference signals, wherein an image display position with respect to a horizontal synchronizing signal in the progressive scanning video signal output is delayed, and a delayed portion of the luminance signal corresponds to black. A video signal processing apparatus comprising an image position control means for inserting a signal corresponding to an achromatic color into a delayed portion of the two color difference signals. 2. An image position control means for giving a delay of an integral multiple of a preset time to a video signal output position with respect to a horizontal synchronizing signal of a progressive scanning video signal output, and blackening a delayed portion of a luminance signal. 2. The video signal processing apparatus according to claim 1, wherein a corresponding signal is inserted, and a signal corresponding to an achromatic color is inserted into a delayed portion of the two color difference signals. 3. An image position control means for applying a delay of a time selected from a plurality of delay times set in advance to a video signal output position with respect to a horizontal synchronization signal of a progressive scanning video signal output, and 2. The video signal processing apparatus according to claim 1, wherein a signal corresponding to black is inserted into a delayed portion, and a signal corresponding to an achromatic color is inserted into a delayed portion of the two color difference signals. 4. The video signal processing device according to claim 1, wherein the progressive scanning video signal is a progressive scanning video signal system having 480 vertical pixels.