JPH08163512A - System converter - Google Patents

Abstract

PURPOSE: To simplify the circuit configuration for the converter converting a MUSE signal into a PDP signal. CONSTITUTION: The converter is provided with a luminance signal processing section 10 converting a MUSE luminance signal Y into a PDP signal, a color difference signal processing section 30 converting MUSE color difference signals R-Y, B-Y into PDP signals, and an inverse matrix circuit 50, and the processing section 10 converts a Y signal into a noninterlace signal and number of scanning lines and dot numbers for a MUSE signal are converted into those of PDP, a luminance signal level is adjusted to emphasize a contour component. The processing section 30 applies dot interleave to the R-Y and B-Y signals alternately to be converted into number of scanning lines and dot numbers for the PDP signal, and a color difference signal level is adjusted to separate a color difference signal subject to dot interleaving into two kinds of color difference signals. The circuit 50 reproduces R, G, B signals from outputs of the processing sections 10, 30 to provide an output of the PDP signal and a video image with high image quality and low noise corresponding to a high vision program is displayed.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a MUSE signal (for example, MUSE) for displaying a high-definition program on a digital display such as a plasma display panel (hereinafter simply referred to as PDP) or a liquid crystal display panel.
The present invention relates to a system conversion device that system converts a simple high-definition signal) into a signal for a digital display. Here, MUSE is Multiple Sub-Nyquist Sampling Encodi
represents ng.

[0002]

2. Description of the Related Art Conventionally, when displaying a high-definition program on a PDP, the MUSE signal is first converted into an NTSC signal, the NTSC signal is converted into a PDP signal, and the PDP signal is supplied to the PDP. By doing so, the high definition image is displayed on the PDP.

[0003]

However, the above-described conventional system conversion device temporarily transmits the MUSE signal to the NTSC.
Since the system is converted to the signal and then to the PDP signal, there is a problem that the circuit configuration becomes complicated.

The present invention has been made in view of the above-mentioned problems, and a high-definition program is displayed on a digital display (for example, PD
P) to display with high image quality and low noise, MUSE
It is an object of the present invention to simplify the circuit configuration of a system converter for converting a signal into a signal for a digital display. Another object of the present invention is to enable the contour (edge) of the displayed image to be efficiently emphasized when the image of the high-definition program is displayed on the digital display.

[0005]

According to a first aspect of the present invention, there is provided a system conversion apparatus, which comprises a brightness signal processing section for system converting a MUSE brightness signal into a brightness signal for a digital display, and a MUSE.
A color difference signal processing unit for system-converting a color difference signal into a color difference signal for the digital display, and an inverse for reproducing R, G, B signals for the digital display from output signals of the luminance signal processing unit and the color difference signal processing unit. A matrix conversion circuit, wherein the luminance signal processing section converts the MUSE luminance signal into a non-interlaced signal, and a digital display of the number of scanning lines per field of the output signal of the scanning conversion circuit. Luminance signal line number conversion circuit for converting the number of scanning lines for the display device, and a luminance signal dot number conversion circuit for converting the number of dots per line of the output signal of the luminance signal line number conversion circuit into the number of dots for the digital display And the color difference signal processing unit includes:
A color difference signal synthesizing circuit that alternately interleaves two types of color difference signals and one of the output signals of this color difference signal synthesizing circuit
A color difference signal line number conversion circuit for converting the number of scanning lines per field into the number of scanning lines for the digital display, and the number of dots per line of the output signal of the color difference signal line number conversion circuit is the dot for the digital display. A color difference signal dot number conversion circuit for converting into a number, and a color difference signal separation circuit for separating the dot interleaved color difference signal output from the color difference signal dot number conversion circuit into two kinds of color difference signals. It is a feature.

According to a second aspect of the present invention, in the first aspect of the invention, the digital display is a PDP.

According to a third aspect of the present invention, in the first or second aspect of the invention, the luminance signal processing section is provided with an edge enhancing circuit for enhancing the contour component of the luminance signal at the final stage.

The invention of claim 4 is the invention of claim 1, 2 or 3.
In the invention, the luminance signal processing unit includes a luminance signal level adjusting circuit that adjusts the luminance signal level by adding / subtracting a set value to / from the luminance signal, and the color difference signal processing unit corresponds to each of two types of color difference signals. The color difference signal level adjusting circuit adjusts the color difference signal level by adding / subtracting the set value.

[0009]

In the system conversion apparatus according to the present invention, in the luminance signal processing section, the scanning conversion circuit converts the MUSE luminance signal which is an interlaced signal into a non-interlaced signal, and the luminance signal line number conversion circuit then The number of scanning lines per field is converted into the number of scanning lines for digital display (for example, for PDP), and then the luminance signal dot number conversion circuit
Convert the number of dots per line to the number of dots for the digital display.

In the color difference signal processing section, the color difference signal synthesizing circuit uses two types of MUSE color difference signals (for example, RY and B).
-Y signals) are alternately dot-interleaved, and then the color difference signal line number conversion circuit converts the number of scanning lines per field into the number of scanning lines for the digital display, and then the color difference signal dot number conversion circuit per line. The number of dots is converted into the number of dots for the digital display, and then the color difference signal separating circuit separates the color difference signals with dot interleaving into two kinds of color difference signals (for example, RY and BY signals).

The inverse matrix circuit reproduces R, G, B signals for a digital display from the luminance signal output from the luminance signal processing section and the color difference signal output from the color difference signal processing section and supplies them to the digital display. . Therefore, the digital display displays a high-quality, low-noise image corresponding to a high-definition program.

According to the invention of claim 2, in the invention of claim 1, since the digital display is a PDP, the PDP displays a high-quality, low-noise image corresponding to a high-definition program.

According to a third aspect of the present invention, in the first or second aspect of the invention, since the luminance signal processing section includes an edge enhancement circuit at the final stage, this edge enhancement circuit is provided in the conversion circuit (scanning) located in the previous stage. Adverse effect (for example, waveform dullness) due to conversion circuits, line conversion circuits, dot conversion circuits, etc.
The contour component of the luminance signal can be efficiently emphasized without being affected.

According to a fourth aspect of the present invention, in the first, second or third aspect of the invention, the luminance signal processing section includes a luminance signal level adjusting circuit, and the color difference signal processing section includes a color difference signal level adjusting circuit. Therefore, the brightness signal level adjustment circuit adjusts the brightness signal level by adding and subtracting the set value to the brightness signal,
The color-difference signal level adjustment circuit uses two types of color difference signals
The color difference signal level is adjusted by adding / subtracting the set value corresponding to each of the RY and BY signals.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the system converter according to the present invention will be described below with reference to FIG. In FIG. 1, a MUSE luminance signal, which is a component component of a MUSE signal (for example, a MUSE simplified high-definition signal), is represented by a Y signal and a MUSE signal.
If the two types of color difference signals are the RY signal and the BY signal,
Reference numeral 10 is a luminance signal processing unit that converts the Y signal into a PDP luminance signal, and 30 is a color difference signal processing unit that converts the RY signal and the B-Y signal into a PDP color difference signal.

The brightness signal processing section 10 has an input terminal 12
Scan conversion circuit 14 for converting the Y signal (interlaced signal) input to the non-interlaced signal for each field
And the number of scanning lines per field of the luminance signal converted by the scanning conversion circuit 14 (the number of lines, for example, 1125).
Luminance signal line number conversion circuit 16 (hereinafter simply referred to as line number conversion circuit 16) for converting the number of lines) into the number of scanning lines for PDP (for example, 480 lines), and the number of lines conversion circuit 16
The number of dots per line (for example, 1920 dots) of the luminance signal converted by the above is calculated as the number of dots for PDP (for example, 6 dots).
40 dots) luminance signal dot number conversion circuit 18
(Hereinafter simply referred to as the dot number conversion circuit 18) and a brightness signal level adjustment circuit 20 (hereinafter referred to as a brightness signal level adjustment circuit for adjusting a brightness signal level by adding / subtracting a preset value to / from the brightness signal converted by the dot number conversion circuit 18 Simply the level adjustment circuit 20
And an edge enhancement circuit 22 for enhancing the contour component of the luminance signal adjusted by the level adjustment circuit 20.

The color difference signal processing section 30 has an input terminal 3
The color difference signal combining circuit 36 for alternately dot interleaving the RY signals and the BY signals inputted to 2, 34, and the number of scanning lines per field of the color difference signals dot interleaved by the color difference signal combining circuit 36 The color difference signal line number conversion circuit 38 (hereinafter simply referred to as line number conversion circuit 38) for converting into the number of scanning lines for PDP, and the number of dots per line of the color difference signal converted by the line number conversion circuit 38 Color difference signal dot number conversion circuit 40 (hereinafter simply referred to as dot number conversion circuit 40) for converting into the number of dots for PDP, and each of the color difference signals converted by the dot number conversion circuit 40 (RY signal component, A color difference signal level adjustment circuit 42 (hereinafter simply referred to as a level adjustment circuit 42) that adjusts a color difference signal level by adding and subtracting a preset value to the BY signal component). And a color-difference signal separation circuit 44 for separating the color-difference signal adjusted by the level adjustment circuit 42 and subjected to dot interleaving into individual color-difference signals (RY signal component, BY signal component). are doing.

Reference numeral 50 is an RGB inverse matrix circuit. The RGB inverse matrix circuit 50 is for the PDP luminance signal converted by the luminance signal processing section 10 and for the PDP converted by the color difference signal processing section 30. The R, G, and B signals for PDP are reproduced from the color difference signals of and output to the output terminals 52, 54, and 56.

Reference numeral 60 denotes a control signal generating circuit, which controls each circuit in the luminance signal processing section 10 and the color difference signal processing section 30 based on the MUSE frame pulse input to the input terminal 62. In addition to outputting the corresponding control signal, the control signal for PDP is output to the output terminal 64. The output terminal 52,
PDs 54, 56, and 62 as digital displays
P (not shown) is connected.

Next, the operation of FIG. 1 will be described. (A) The luminance signal processing unit 10 receives the Y signal (interlaced signal) which is the MUSE luminance signal input to the input terminal 12.
Is converted into a non-interlaced signal and then converted into the number of scanning lines and the number of dots for PDP, and then the luminance signal level is adjusted to emphasize the contour component and output to the RGB inverse matrix circuit 50 as the luminance signal for PDP. To do. At this time,
Each circuit 14, 16, 18, 2 in the luminance signal processing unit 10
0 and 22 are controlled by the control signal of the control signal generation circuit 60. Further, the level adjusting circuit 20 adjusts the brightness by adjusting the brightness signal level, and since the edge emphasizing circuit 22 is at the final stage, the edge adjusting circuit 22 is not affected by the conversion circuits 14, 16 and 18 (for example, the waveform is blunted) and the brightness is increased. The contour component of the signal can be emphasized.

(B) The color difference signal processing section 30 has the input terminal 3
The RY and BY signals, which are the MUSE color difference signals input to 2 and 34, are combined by alternately dot interleaving and then converted into the number of scanning lines and the number of dots for PDP, and then the color difference signal level is adjusted. After that, the color difference signals subjected to dot interleaving are separated into individual color difference signals, and the PDP is separated.
It is output to the RGB inverse matrix circuit 50 as a color difference signal for. At this time, each circuit 3 in the color difference signal processing unit 30
6, 38, 40, 42, 44 are controlled by the control signal of the control signal generation circuit 60. In addition, the level adjustment circuit 4
In No. 2, the color tone can be adjusted by adjusting the color difference signal level.

(C) The RGB inverse matrix circuit 50 is
From the luminance signal and the color difference signal for the PDP input from the luminance signal processing unit 10 and the color difference signal processing unit 30, R for the PDP,
The G and B signals are reproduced and output to the PDP via the output terminals 52, 54 and 56. Further, the control signal generation circuit 60 is M
The control signal for PDP created based on the USE frame pulse is output to the PDP via the output terminal 64. Therefore, the PDP displays an image corresponding to the MUSE signal.

In the above embodiment, the case where the PDP is used as the digital display has been described, but the present invention is not limited to this, and the case where the liquid crystal display panel is used as the digital display can be used. .

In the above-described embodiment, the edge enhancement circuit is provided at the final stage of the luminance signal processing unit so that the conversion circuit (scan conversion circuit, line number conversion circuit, dot number conversion circuit) at the previous stage has an adverse effect (for example, the waveform becomes dull). However, the present invention is not limited to this, and edge enhancement can be performed at a stage other than the final stage of the luminance signal processing unit (for example, between conversion circuits or before). It can also be used for those provided with a circuit. Further, the present invention can be applied to the case where the edge enhancement circuit of the luminance signal processing section is omitted.

In the above embodiment, the luminance signal processing section is provided with the luminance signal level adjusting circuit and the color difference signal processing section is provided with the color difference signal level adjusting circuit so that the brightness and the hue can be easily adjusted. However, the present invention is not limited to this, and the present invention can also be applied to those in which the luminance signal level adjusting circuit and the color difference signal level adjusting circuit are omitted.

[0026]

According to the first aspect of the present invention, there is provided a system conversion apparatus comprising a luminance signal processing section, a color difference signal processing section and an inverse matrix circuit, and the luminance signal processing section comprises a scanning conversion circuit and a luminance signal line number conversion. By including a circuit and a luminance signal dot number conversion circuit, the MUSE luminance signal is converted into a luminance signal for a digital display, and the color difference signal processing unit includes a color difference signal combining circuit, a color difference signal line number conversion circuit, and a color difference signal dot number. By including the conversion circuit and the color difference signal separation circuit, the MUSE color difference signal is converted into the color difference signal for the digital display, and the inverse matrix circuit outputs the R, G, B signals from the output signals of the luminance signal processing unit and the color difference signal processing unit. Configured to play.

Therefore, the system of the MUSE signal can be directly converted into the signal for the digital display.
The circuit configuration can be simplified as compared with the conventional example in which the SE signal is once converted into the NTSC signal and then converted into the signal for the digital display. Further, unlike the conventional example, since it does not include an analog circuit, it is unlikely to be affected by noise. Therefore, it is possible to simplify the circuit configuration of the system converter for displaying a high-definition program on a digital display with high image quality and low noise.

According to a second aspect of the present invention, since the digital display is the PDP in the first aspect of the invention, the circuit configuration of the system conversion device for displaying a high-quality, low-noise image corresponding to a high-definition program on the PDP. Can be simplified.

According to a third aspect of the present invention, in the first or second aspect of the invention, the luminance signal processing section has an adverse effect (for example, a blunted waveform) due to the scan conversion circuit, the line conversion circuit, and the dot conversion circuit located in the preceding stage. Since the edge enhancement circuit is provided in the final stage which is not affected, the contour component of the luminance signal can be efficiently enhanced.

The invention of claim 4 is the same as claim 1, 2 or 3.
In the invention described above, the luminance signal processing unit includes an adjusting circuit that adjusts the luminance signal level, and the color difference signal processing unit includes an adjustment circuit that adjusts the color difference signal level. Adjustment can be facilitated.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a system conversion device according to the present invention.

[Explanation of symbols]

Reference numeral 10 ... Luminance signal processing unit, 12, 32, 34, 62 ... Input terminal, 14 ... Scan conversion circuit, 16 ... Luminance signal line number conversion circuit, 18 ... Luminance signal dot number conversion circuit, 20
... Brightness signal level adjustment circuit, 22 ... Edge enhancement circuit,
30 ... Color difference signal processing unit, 36 ... Color difference signal combining circuit, 3
8 ... Color difference signal line number conversion circuit, 40 ... Color difference signal dot number conversion circuit, 42 ... Color difference signal level adjustment circuit, 44 ...
Color difference signal separation circuit, 50 ... RGB inverse matrix circuit, 52, 54, 56, 64 ... Output terminal, 60 ... Control signal generation circuit, BY, RY ... MUSE color difference signal,
Y ... MUSE luminance signal.

Claims (4)

[Claims] 1. A luminance signal processing section for system-converting a MUSE luminance signal into a luminance signal for a digital display, a color-difference signal processing section for system-converting a MUSE color-difference signal into a color-difference signal for the digital display, and the luminance signal processing. Section and an inverse matrix circuit for reproducing the R, G, B signals for the digital display from the output signal of the color difference signal processing section, and the luminance signal processing section converts the MUSE luminance signal into a non-interlaced signal. A scanning conversion circuit for converting, a luminance signal line number conversion circuit for converting the number of scanning lines per field of an output signal of the scanning conversion circuit into the number of scanning lines for the digital display, and the luminance signal line number conversion circuit. A luminance signal dot number conversion circuit for converting the number of dots per line of the output signal into the number of dots for the digital display, Chrominance signal processing unit, the MUSE
A color difference signal synthesizing circuit that alternately interleaves two types of color difference signals and one of the output signals of this color difference signal synthesizing circuit
A color difference signal line number conversion circuit for converting the number of scanning lines per field into the number of scanning lines for the digital display, and the number of dots per line of the output signal of the color difference signal line number conversion circuit is the dot for the digital display. A color difference signal dot number conversion circuit for converting into a number, and a color difference signal separation circuit for separating the dot interleaved color difference signal output from the color difference signal dot number conversion circuit into two kinds of color difference signals. Characteristic method conversion device. 2. The system conversion device according to claim 1, wherein the digital display is a plasma display panel. 3. The luminance signal processing section comprises an edge enhancement circuit for enhancing the contour component of the luminance signal at the final stage.
Or the method conversion device described in 2. 4. The luminance signal processing unit comprises a luminance signal level adjusting circuit for adjusting a luminance signal level by adding and subtracting a set value to and from the luminance signal, and the color difference signal processing unit sets the respective color difference signals in correspondence with each other. 4. The system conversion device according to claim 1, 2 or 3, further comprising a color difference signal level adjusting circuit that adjusts the color difference signal level by adding and subtracting values.