JPH0365865A - MUSE decoder output circuit - Google Patents

Abstract

PURPOSE:To output the high frequency component of the Y signal and utilize the enhancement and to attain high brightness by providing an output terminal through which a high frequency component of a Y signal is outputted singly so as to avoid the high frequency component of the Y signal from being added to an output RGB signal. CONSTITUTION:A Y signal, a Y-R signal and a B-Y signal outputted from a TCI(time compressed integration) are converted into RGB signals and in the case of gamma correction, the Y signal is subject to gamma correction and the high frequency component of the Y signal subject to gamma correction is extracted and its high frequency component is added to the RGB signals subject to gamma correction, the result is converted into an analog signal and outputted in the MUSE decoder output circuit, which has an output terminal 16 outputting the high frequency component of the Y signal singly so as not to add the high frequency component of the Y signal to the output RGB signal. Thus, the high frequency component of the Y signal (enhancement) is outputted singly from the output terminal (E terminal) 16. Thus, the system is independent of the deviation in the convergence and high brightness of the MUSE receiver is attained.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is applicable to MLISE (+multiple 5ubn
yquist sampling encoding
) The present invention relates to an output circuit of a decoder, and more specifically relates to an output circuit of a υSE decoder that can expand the use of high-definition receivers.

[Technical background and issues] In recent years, TV receivers with larger screens (aspect ratio 9)
: 16) Various high-definition television receivers (HDTVs) are being developed. Compared to current television receivers, HDTVs are superior in not only the sense of realism and power of images, but also the texture of images, and it is only a matter of time before they are put into practical use.

By the way, in HDTVs such as MLISE receivers, the transmitted MUSE signal is a band compression signal, so in order to reproduce images from the MISE signal, a current TV receiver must have an &I MUSE decoder (memory ) is required.

This MUSE decoder is equipped with an output circuit shown in FIG. 4, for example. This output circuit includes TCI (ti
me compleasad integration
), an inverse matrix circuit 1 that converts the Y signal, R-Y signal, and B-Y signal output from γ-1 to gamma correct only the above Y signal
A correction unit 5, a filter unit (HPL) 6 that extracts the high frequency component (enhancement amount) of this gamma-corrected Y signal, and adders 7, 8.9 that add this high frequency component to the gamma-corrected RGB signals, respectively. , D/A converters 10, 11, and 12 that convert these added RGB signals into analog signals;
Filter sections (LPF) 13, 14, and 15 are provided that make this analog RGB signal a 22 M cell bandwidth.

By inputting these 22 MHz bandwidth RGB signals to the display, high-definition broadcasting is displayed on the display.

By the way, in the output circuit of the above MUSE decoder, the convergence (Conv) of the display (monitor)
In order to suppress the deviation of the Y signal, the high frequency component of the Y signal is added to the output RGB signal, but when larger screens and higher brightness are required in the future, the high frequency component of the Y signal mentioned above will be added to the output RGB signal. It is difficult to suppress the convergence shift by just adding
It is conceivable to combine it with an SE monitor, but current projection type projectors also have problems with convergence deviation and high brightness, so it is difficult to suppress convergence deviation with the output circuit of the MUSE decoder mentioned above. It is also difficult to increase the brightness.

This invention was made in view of the above-mentioned problem, and its purpose is to output the high frequency component (enhancement amount) of the Y signal and use this enhancement amount to enable high brightness.
Another object of the present invention is to provide an output circuit for a MUSE decoder that can suppress convergence deviation and expand the use of the MUSE decoder.

[Means for Solving the Problem] In order to achieve the above object, the present invention converts the Y signal, R-Y signal, and B-Y signal output from the TCI into RGB signals, and performs gamma correction. Above Y
Gamma-correct the signal, extract high-frequency components of this gamma-corrected Y signal, add these high-frequency components to the gamma-corrected RGB signals, convert the added RGB signals to analog, and output. The output circuit of the MUSE decoder has an output terminal that outputs the high-frequency component of the Y signal alone, and the high-frequency component of the Y signal is not added to the output RGB signal. .

[Function] With the above configuration, the high frequency component (enhancement amount) of the Y signal is output independently from the output terminal (E terminal), so by using the high frequency component in various ways, the Must
! For example, by providing a liquid crystal shutter in the black matrix part of the monitor (dayplay) screen and driving this liquid crystal shutter according to the high frequency component from the E terminal, the monitor screen can be used in various ways. This makes it possible to suppress the shift in convergence when increasing the brightness. In addition, in the case of a MUSE projection type projector, a monitor screen for the high frequency component of the Y signal is provided in addition to the RGB monitor screen. In other words, by making it a 4-tube type,
It is possible to increase the brightness of the screen and to suppress convergence deviation.

[Example] Hereinafter, an example of the present invention will be described based on FIGS. 1 to 3. In FIG. 1, parts that are the same as those in FIG. 4 are given the same reference numerals, and redundant explanation will be omitted.

In FIG. 1, the output circuit of the MUSE decoder is equipped with an E terminal (output terminal) 16 that outputs the high frequency component (enhancement amount) of the Y signal. Furthermore, the adders 7, 8.9 shown in FIG. 4 are omitted, and the high-frequency components of the Y signal are not added to the gamma-corrected ROB signals, and the RGB signals that are not added are added to the D/ A converter 1
0, 11, and 12 are converted to analog. That is, the MUSE decoder outputs RGB signals to which the high frequency components of the Y signal are not added and high frequency components of the Y signal independent of these RGB signals.

Here, a method of using the E terminal will be explained with reference to FIGS. 2 and 3.

In FIG. 2, a liquid crystal shutter 18 is provided in the black matrix portion of the monitor screen 17, and this liquid crystal shutter can be operated by the high frequency component of the Y signal from the E terminal 16. That is, as the brightness of the monitor increases, the shift in convergence of the monitor becomes noticeable, but this is because the liquid crystal shutter 17 operates according to the high frequency component of the Y signal.

It is possible to make the convergence shift less noticeable.

Furthermore, in FIG. 3, an MCl5E projection type projector is assumed, and this MUSE projection type projector is equipped with a monitor 22 for the high frequency component of the Y signal in addition to the RGB monitors 19, 20, and 21. . That is, RGB
Since one tube for the high-frequency component is added to the three tubes, it is possible to increase the brightness of the screen 23, and it also makes convergence deviation less noticeable.

In this way, the high-frequency component (enhancement amount) of the Y signal is output independently, so the enhancement amount can be used in various ways, which not only expands the use of MUSE receivers, but also improves future MUSE receivers. When increasing the brightness of a device, it is possible to increase the brightness without being affected by a convergence shift, and when using a MUSE receiver in a projection type projector, it is possible to increase the brightness without being affected by a convergence shift.

In addition, by outputting the high frequency component of the Y signal alone,
Adders 7, 8, and 9 are omitted, and MUSII! The number of circuits required for the output circuit of the decoder can be reduced.

[Effects of the Invention] As explained above, according to the output circuit of the MUSE decoder of the present invention, the adder that adds the high frequency component of the Y signal to the RGB signal is omitted, and the circuit outputs the high frequency component independently. By using the high-frequency component of the Y signal, it is possible to increase the brightness of the CRT monitor without being affected by convergence deviation, and it is possible to increase the brightness of the MUSE receiver. Furthermore, it can be used in projection type projectors that require high brightness.

[Brief explanation of drawings]

FIG. 1 is a schematic block diagram of an output circuit of a MUSE decoder showing an embodiment of the present invention, FIGS. 2 and 3 are diagrams for explaining how to use the MUSE decoder, and FIG. FIG. 2 is a schematic block diagram of an output circuit of a MUSE decoder. In the figure, 1 is an inverse matrix circuit, 2, 3, 4, and 5 are γ-1
Correction section, 6 is filter section (HPL), 10, 11, 12
is a D/A converter, 13, 14.15 is a filter unit (LP
F), 16 is an E terminal (output terminal).

Claims (1)

[Claims] (1) When converting the Y signal, R-Y signal, and BY signal output from the TCI into RGB signals and performing gamma correction, the Y signal is gamma-corrected, and the gamma-corrected Y signal is In an output circuit of a MUSE decoder that extracts high-frequency components, adds each of the high-frequency components to the gamma-corrected RGB signals, converts the added RGB signals to analog, and outputs the high-frequency components of the Y signal. What is claimed is: 1. An output circuit for a MUSE decoder, comprising: an output terminal that outputs a single signal; and a high frequency component of the Y signal is not added to the output RGB signal.