JPH02219369A - Video signal processor - Google Patents

Abstract

PURPOSE:To adjust a reproduced picture in a common circuit by applying digital processing to a video signal different in signal form, converting the signal into Y and C signals, adjusting the signals, and returning the signals to three primary colors by an inverse matrix circuit common for the both signals. CONSTITUTION:The digital video signals of the three primary colors even to either high-vision or NTSC are supplied to signal input terminals 10-12 and these signals are converted to analog signals by D/A conversion circuit 20-22. Then, three primary color signals are sent through interpolation filter circuits 30-32. A matrix circuit 40 supplies the Y signal to subtractors 41 and 42 and a Y signal processing circuit 50. The circuit 50 adjusts the Y signal to a desired state and supplies the signal to an inverse matrix circuit 70. The subtractors 41 and 42 respectively supply B-Y and R-Y signals to first and second C signal processing circuits 60 and 61. In the circuits 60 and 61, the amplitude of the C signal is respectively adjusted. These Y, B-Y and R-Y signals are converted to three primary color signals G, B and R in the circuit 70, and sent to signal output terminals 80-82.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a video signal processing device.

In conventional technology television, on the transmitting side, the 3
The primary color (RGB) signal is converted into a luminance (Y) signal and a color difference (C) signal, subjected to specified signal processing, and sent out. On the receiving side, the incoming signal is processed and restored to the original three primary color signals and sent to the CRT. However, the appropriate image quality of the reproduced image varies depending on the monitoring conditions and the viewer's subjectivity. Therefore, it is desirable for the video signal processing device on the receiving side to be able to set the brightness, contrast, saturation, etc. of the reproduced image to the desired state. ) is also desired to be equipped with these image quality adjustment functions.

This high-definition broadcasting is based on the MUSE (MUSE) system (Development of the MUSE system: NHK Technical Research, 1986).
2, VOL32. N02) is planned to be used. In the MUSE method, a luminance signal and a color difference signal are time-division multiplexed within one horizontal scanning line, band compression is performed by subsampling, and the signal is transmitted as an analog signal, so on the receiving side, the incoming signal is converted to a digital signal and the band It is necessary to perform compression restoration processing. Furthermore, since signal transmission uses a pseudo-constant brightness method in which the receiver side compensates for the nonlinear electrical/optical conversion (gamma) characteristics of the display device, performing all of these signal processing digitally stabilizes the operation of the device. It is effective for

Therefore, it is desirable to perform D/A conversion after restoring the three primary color signals of RGB. In this case, it is necessary to adjust the saturation of the reproduced image in a digital processing section, which increases the size of the device due to the increase in the number of bits. Alternatively, the fine adjustment function may deteriorate due to an insufficient number of bits. In addition, it is desired that receivers compatible with high-definition broadcasting can also receive broadcasting using the current NTSC system, and such dual-system compatible types will not only be able to adjust the saturation described above, but also have adjustment functions such as brightness and contrast. Each must be placed independently. Furthermore, this contrast adjustment has conventionally been performed using G,
A configuration in which the amplitudes of the three BIR primary color signals are controlled is generally used.

Problems to be Solved by the Invention However, with the above configuration, in order to reproduce a proper image, it is necessary to adjust the contrast independently for NTSC broadcasting and high-definition broadcasting. Conventional methods for controlling the amplitudes of the three primary color signals require precision components or circuits because they must be precisely balanced to prevent changes in the color temperature of the displayed image, and therefore This poses problems such as not only the operability deteriorates but also the economic efficiency.

In view of this, the present invention provides video signal processing that allows a viewer to optimize a reproduced image with a substantially single adjustment operation for both high-definition and NTSC broadcasting when adjusting a receiver. The purpose is to provide a device.

Means for Solving the Problems The invention according to claim 1 provides a digital video signal processing circuit that processes a first video signal and a second video signal of different formats and sends them both as three primary color signals, and an output of this circuit. A digital-to-analog conversion circuit that serves as an input signal, an analog matrix circuit that converts the three primary color signals sent by this conversion circuit into a luminance signal and a color difference signal, and transmits at least the relative amplitude of these luminance signals and color difference signals. It has an analog video signal processing circuit for controlling, and an analog inverse matrix circuit for converting the output of this circuit into a primary color signal, and is configured so that this inverse matrix circuit can be used commonly for the first and second video signals. It is characterized by this.

The invention as claimed in claim 2 provides a digital video system that processes a first video signal and a second video signal of different formats, and sends out the first video signal as a three primary color signal and the second video signal as a luminance signal and a color difference signal. A signal processing circuit, a digital-to-analog conversion circuit that uses the output of this circuit as an input signal, and converts the three primary color signals sent out by this conversion circuit into a luminance signal and a color difference signal, and also sends out the brightness signal and color difference signal. An analog matrix circuit that effectively stops matrix processing operations, an analog video signal processing circuit that controls at least the relative amplitude of these luminance signals and color difference signals, and an analog inverse matrix that converts the output of this circuit into primary color signals. The present invention is characterized in that the inverse matrix circuit is configured so that it can be used commonly for the first and second video signals.

According to the above-described configuration, the present invention converts the three primary color signals sent by the digital video signal processing circuit into a luminance signal and a color difference signal using a matrix circuit, and converts the relative amplitudes of the converted luminance signal and color difference signal into an analog video signal. After being controlled by the processing circuit, the first and second video signals are converted back into the RGB three primary color signals by the IJ circuit, which produces a proper image without deteriorating the receiver's operability. It can be adjusted to obtain

Embodiment FIG. 1 shows a configuration diagram of a video signal processing apparatus in a first embodiment of the present invention.

In FIG. 1, digital video signals of three primary colors are supplied to signal input terminals 10, 11, and 12 for both high-definition and NTSC, and these are supplied to the D/A conversion circuit 20.
After being converted into an analog signal by 2L22, the conductor 301.31 is passed through an interpolation filter (LPF) 30.31.32.
At 1.321, the three primary color signals of G, B, and R are sent out. The matrix circuit 40 supplies a Y signal obtained by adding these three primary color signals at predetermined ratios, for example approximately 60%, 10%, and 30%, to one of the subtracters 41 and 42 and also to the Y signal processing circuit 50. supply This Y signal processing circuit 50 adjusts the amplitude, DC level, amplitude frequency characteristics, etc. of the supplied Y signal to a desired state using a control signal from a control signal input terminal 51, and transmits the signal to an inverse matrix circuit 70 via a conductor 52. Supplies Y signal to

The subtracter 41 supplies the B-Y signal obtained by subtracting the Y signal supplied from the matrix circuit 40 and the B signal supplied via the conducting wire 311 to the -Cth signal processing circuit 60. . Further, another subtracter 42 supplies the second C signal processing circuit 61 with an R-Y signal obtained by subtracting the aforementioned Y signal and the R signal supplied via the conducting wire 321. . These first and second C signal processing circuits 6016
1, the amplitude of the C signal is adjusted by a control signal supplied from the second control signal input terminal 62 via the conductor 621. These Y signal processing circuits 501 C-th signal processing circuit 6
0, Y, B-Y, R sent out by the second C signal processing circuit 61
-Y signal is converted into three primary color signals of GlB and R by the inverse matrix circuit 70, and then sent to signal output terminals 80, 81.
82.

This inverse matrix circuit 70 supports high-definition, NTSC
A common coefficient is used for both, and in this embodiment, the BY and RY axes are used, but other axes may be used. For example, it is of course possible to use the Q axis or other axes, and in this case, after converting the output signals of the subtracters 41 and 42 to match the desired C signal axis, It is sufficient to supply the signal to the C signal processing circuits 60 and 61.

As described above, according to this embodiment, the D/
A conversion circuit 20, 21, 22 matrix circuit 40 Y/
The first and second C signal processing circuits convert at least the relative amplitudes of these Y/C signals into C signals.
After adjusting with o1 ei, G,
Since it is configured to restore the three primary color signals of B and R and supply them to the display device, it is possible to adjust the contrast, saturation, etc. of the reproduced image using a common circuit, and therefore, it is inexpensive and significantly improves operability. A receiver can be provided.

FIG. 2 shows a configuration diagram of a video signal processing device according to a second embodiment of the present invention, in which a signal input terminal 10011
10.120 shows an apparatus suitable for supplying three primary color digital video signals for high-definition, and a Y signal and two types of color difference signals for NTSC.

In FIG. 2, when processing a high-definition signal, 3
The primary color digital video signal is sent to the D/A conversion circuit 200.2.
10. After being converted to an analog signal at 220, LPF3
Conductor 302.312.3 through 00.310.320
G on 22 respectively.

Sends out three primary color signals of B and R. Matrix circuit 4
00 converts these three primary color signals to a predetermined ratio, for example approximately 6
The Y signal added at 0%, 10%, and 30% is sent to the subtracter 41.
0.420 via a switch 401 (solid line in FIG. 2), and a switch 402 to the Y signal processing circuit 500.
(solid line in Figure 2). This Y signal processing circuit 500 adjusts the amplitude, DC level, amplitude frequency characteristics, etc. of the supplied Y signal to a desired state using a control signal from a control signal input terminal 510, and connects the Y signal to an inverse matrix circuit 700 via a conductor 520. Supplies Y signal to

The subtracter 410 subtracts the Y signal supplied from the matrix circuit 400 and the B signal supplied via the conductive wire 312, and outputs the B-Y signal to the -Cth signal processing circuit 6.
Supply to 00. Further, another subtracter 420 supplies the R-Y signal obtained by subtracting the aforementioned Y signal and the R signal supplied via the conducting wire 322 to the second C signal processing circuit 610. . In these first and second C signal processing circuits 600 and 610, the amplitude of the C signal is adjusted by a control signal supplied from a second control signal input terminal 620 via a conductive wire 622. These Y signal processing circuit 5001 -C signal processing circuit 6oo1 Second C signal processing circuit 610
The Y, B-Y, and R-Y signals sent out by the inverse matrix circuit 700 are converted into G and B signals by the inverse matrix circuit 700.

After being converted into R three primary color signals, the signal output terminal 800.
810.820.

Next, when processing an NTSC signal, the Y signal and two color difference signals (hereinafter referred to as B-Y for convenience of explanation) supplied to the signal input terminals 100, 110, and 120 are used.

Use the RY axis. ) is D/A conversion circuit 2001210
122 (1) and is converted into an analog signal via LPF 300, 310, 320. In this case, switch 401
(Dotted line in FIG. 2) indicates that the matrix circuit 400 is connected to the subtracter 41
The Y signal supplied to 0 is made substantially zero. Thus, subtracters 410 and 420 provide the BY and RY signals provided via conductors 312 and 322, respectively, to first and second C signal processing circuits 600 and 610. These C signals are connected to the first and second signal processing circuits Boo and 8, which adjust the amplitude of the output signal in response to the control signal from the control signal input terminal 620.
After being processed in step 10, it is supplied to an inverse mask circuit 700. Another switch 402 (broken line in FIG. 2) transmits the Y signal sent by the LPF 300 to the Y signal processing circuit 50.
Supply to 0.

This Y signal processing circuit 500 has a control signal input terminal 510
After adjusting the amplitude of the output signal in response to a control signal from the Y signal, the Y signal is provided to the inverse matrix circuit 700 via conductor 520. The inverse matrix circuit 700 converts these Y and C signals into G and B signals.

Convert to R three primary color signals and output signal to terminal 800.810
1820.

As described above, according to this embodiment, the three primary color digital video signals of G1 B1 R are used as the high-definition signal, and the Yl 0 signal is used as the current television signal, and the D/A conversion circuit 20
Switch 40 also when supplied to 0.210.220
1.402, etc., it becomes possible to adjust the contrast, saturation, etc. of the reproduced image using a common circuit without sacrificing the advantages of the present invention.Therefore, it is possible to create a receiver that is inexpensive and has significantly improved operability. can be provided.

In this embodiment, the color difference signal axis is B-Y.

Although the RY axis is used, it goes without saying that the I, Q axis, or other axes may be used.

As described in detail, according to the present invention, after performing digital processing on video signals having different signal formats, such as a high-definition signal and a current television signal, at least one of the video signals is converted into G, BlR.
When D/A converted as a three primary color digital video signal, this analog three primary color signal is converted into Yl 0 by a matrix circuit.
After converting them into signals and adjusting at least the relative amplitudes of these Y and C signals using an analog video signal processing circuit, a common inverse matrix circuit converts both signals into G, B, and
Since the three primary color signals of R are returned and supplied to the display device, it is possible to adjust the contrast, saturation, etc. of the reproduced image using a common circuit, thus providing a receiver that is inexpensive and has significantly improved operability. If you can do that, the practical effects are great.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a video signal processing apparatus according to a first embodiment of the present invention, and FIG. 2 is a block diagram of a video signal processing apparatus according to a second embodiment of the present invention. 20.21.22.200.210.220...D/
A conversion circuit, 40.400...ma) IJx circuit,
50.600...Y signal processing circuit, 60.61.60
0.610...C signal processing circuit, 70.700...
Inverse matrix circuit.

Claims (2)

[Claims] (1) A digital video signal processing circuit that processes a first video signal and a second video signal of different formats and sends them both as three primary color signals, a digital-to-analog conversion circuit that uses the output of this circuit as an input signal, and this conversion An analog matrix circuit that converts the three primary color signals sent out by the circuit into a luminance signal and a color difference signal and sends them out; an analog video signal processing circuit that controls at least the relative amplitude of these luminance signals and color difference signals; 1. A video signal processing device comprising an analog inverse matrix circuit that converts an output into a primary color signal, and configured such that the inverse matrix circuit can be used commonly for first and second video signals. (2) a digital video signal processing circuit that processes a first video signal and a second video signal of different formats and sends out the first video signal as a three primary color signal and the second video signal as a luminance signal and a color difference signal; A digital-to-analog conversion circuit takes the output of this circuit as an input signal, converts the three primary color signals sent by this conversion circuit into a luminance signal and a color difference signal, and effectively performs matrix processing when sending out the luminance signal and color difference signal. It has an analog matrix circuit that stops its operation, an analog video signal processing circuit that controls at least the relative amplitude of these luminance signals and color difference signals, and an analog inverse matrix circuit that converts the output of this circuit into a primary color signal. A video signal processing device characterized in that the inverse matrix circuit is configured so that it can be used commonly for first and second video signals.