JP3663915B2 - Image quality correction device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to image quality correction by speed modulation in a television receiver provided with ghost removing means (hereinafter referred to as GRS).
[0002]
[Prior art]
Conventionally, in this field, that is, the contents relating to image quality correction of a television receiver equipped with GRS, the main feature is that the gain for contour correction of a video signal is variable.
[0003]
[Problems to be solved by the invention]
However, the frequency characteristics are extended by the operation of the GRS. For this reason, noise and the like become conspicuous, but if the contour correction is performed on the video signal at this time, the noise component will be emphasized.
[0004]
Therefore, a means for correcting the contour without emphasizing noise even when the GRS is operating has been required.
[0005]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention does not perform contour correction on the video signal during GRS operation, but corrects the contour by velocity-modulating the electron beam of the CRT and operates during GRS operation. It is a thing that always provides stable image quality correction by changing its effect when there is no.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The television receiver according to claim 1 of the present invention includes a ghost removing means (GRS) 1, a primary differentiation circuit 2, an effect variable means 3 connected to the primary differentiation circuit, and an output thereof. And a drive circuit 5 for the speed modulation coil 4. The GRS 1 is detected to operate, and the effect variable means 3 changes the speed modulation effect to correct the image quality.
[0007]
The television receiver according to claim 2 of the present invention includes a ghost removing means (GRS) 1, a primary differentiation circuit 2, a gain variable means 6 connected to the primary differentiation circuit, and an output thereof. A drive circuit 5 for the speed modulation coil 4 is detected. When the GRS 1 is detected to operate, the gain variable means 6 changes the speed modulation gain to correct the image quality.
[0008]
The television receiver according to claim 3 of the present invention is connected to a ghost removing means (GRS) 1, a primary differentiating circuit 2, a frequency characteristic varying means 7 connected to the primary differentiating circuit, and an output thereof. And a drive circuit 5 for the speed modulation coil 4, detecting that the GRS 1 is operating, and varying the speed modulation effect by the frequency characteristic varying means 7.
[0009]
According to a fourth aspect of the present invention, there is provided a television receiver comprising: a ghost removing means (GRS) 1; a primary differentiation circuit 2; a coring amount variable means 8 connected to the primary differentiation circuit; The drive circuit 5 of the speed modulation coil 4 is detected, and it is detected that the GRS is operating, and the effect of speed modulation is varied by the coring amount varying means 8.
[0010]
According to a fifth aspect of the present invention, there is provided a television receiver comprising: a ghost removing means (GRS) 1; a primary differentiation circuit 2; an amplitude limiting means 9 connected to the primary differentiation circuit; A drive circuit 5 for a speed modulation coil 4, detecting that the GRS is operating, and varying the effect of speed modulation by the amplitude limiting means 9.
[0011]
According to a sixth aspect of the present invention, a television receiver includes a ghost removing means (GRS) 1, a primary differentiating circuit 2, a peaking frequency varying means 10 connected to the primary differentiating circuit, and an output thereof. And a drive circuit 5 for the speed modulation coil 4, detecting that the GRS is operating, and varying the effect of speed modulation by the peaking frequency varying means 10.
[0012]
(Embodiment 1)
FIG. 1 is a schematic configuration diagram of a television receiver according to claim 1 of the present invention. In FIG. 1, a video signal processed by GRS 1 is input to a primary differentiation circuit 2 for speed modulation, The effect variable circuit 3 varies the effect in accordance with the operation of the GRS 1, and is output to the speed modulation coil 4 via the drive circuit 5.
[0013]
On the other hand, the video signal processed by the GRS 1 is processed by the signal processing unit 11 and then displayed on the CRT 12. The velocity modulation coil 4 performs velocity modulation in the horizontal direction on the electron beam in the CRT using the input signal.
[0014]
(Embodiment 2)
FIG. 2 is a schematic configuration diagram of a television receiver according to claim 2 of the present invention. In FIG. 2, a ghost removal function is started in GRS1, and a processed video signal is used as a primary for speed modulation. The gain is input to the differentiation circuit 2, the gain of the contour correction is changed in accordance with the operation of the GRS 1 by the gain variable circuit 6, and is output to the speed modulation coil 4 through the drive circuit 5.
[0015]
Here, since a video signal generally subjected to GRS processing has a characteristic that frequency characteristics increase in a high-frequency band, a gain for contour correction performed by the signal processing unit 11, that is, a contour, compared to when the GRS 1 is stopped. Reduce the degree of emphasis and loosen the contour correction. In that case, on the speed modulation side, the gain variable circuit 6 increases the contour correction gain to compensate for the contour correction effect.
[0016]
(Embodiment 3)
FIG. 3 is a schematic configuration diagram of a television receiver according to claim 3 of the present invention. In FIG. 3, a video signal processed by GRS is input to a primary differentiation circuit 2 for speed modulation, The frequency characteristic variable circuit 7 varies the frequency characteristic according to the operation of the GRS 1, and is output to the speed modulation coil 4 via the drive circuit 5.
[0017]
Here, when GRS1 starts operation, the frequency characteristic variable circuit 7 operates so as to reduce the frequency characteristic compared to the case where GRS1 is stopped. This is because the frequency characteristic is extended by the operation of the GRS.
[0018]
(Embodiment 4)
FIG. 4 is a schematic configuration diagram of a television receiver according to claim 4 of the present invention. In FIG. 4, a video signal processed by GRS is input to a primary differentiation circuit 2 for speed modulation, The coring amount variable circuit 8 changes the coring amount in accordance with the operation of the GRS 1, and outputs it to the speed modulation coil 4 through the drive circuit 5.
[0019]
Here, the coring amount variable circuit 8 increases the coring amount during operation of the GRS 1 to prevent a noticeable noise by performing contour correction on the video signal subjected to the GRS process, and changes the weak signal. Do not emphasize too much.
[0020]
(Embodiment 5)
FIG. 5 is a schematic configuration diagram of a television receiver according to claim 5 of the present invention. In FIG. 5, a video signal processed by GRS is input to a primary differentiation circuit 2 for speed modulation, The amplitude limit variable circuit 9 varies the amplitude limit according to the operation of the GRS 1, and is output to the speed modulation coil 4 via the drive circuit 5.
[0021]
Here, the amplitude limit level variable circuit 9 operates so as to reduce the maximum amplitude limit value during the operation of the GRS 1 compared to when the GRS 1 is stopped. This is effective when the contour correction gain is increased as described in the second embodiment.
[0022]
(Embodiment 6)
FIG. 6 is a schematic configuration diagram of a television receiver according to claim 6 of the present invention. In FIG. 6, the video signal processed by GRS is input to the primary differentiation circuit 2 for speed modulation, The peaking frequency variable circuit 10 varies the peaking frequency in accordance with the operation of the GRS 1, and is output to the speed modulation coil 4 via the drive circuit 5.
[0023]
Here, the peaking frequency variable circuit 10 operates so as to set the peaking frequency, that is, the frequency band where the effect of contour correction is maximized, to be lower during the operation of GRS1 than when GRS1 is stopped. This is because the frequency characteristic is extended by the operation of the GRS.
[0024]
【The invention's effect】
In a television receiver equipped with GRS, image quality can be corrected without much emphasizing noise by varying its effect in conjunction with the GRS removal operation.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing a first embodiment of the present invention. FIG. 2 is a schematic configuration diagram showing a second embodiment of the invention. FIG. 3 is a schematic configuration diagram showing a third embodiment of the invention. 4 is a schematic configuration diagram showing the fourth embodiment of the present invention. FIG. 5 is a schematic configuration diagram showing the fifth embodiment of the present invention. FIG. 6 is a schematic configuration diagram showing the sixth embodiment of the present invention. ]
DESCRIPTION OF SYMBOLS 1 Ghost removal means 2 Primary differentiation circuit 3 Effect variable means 4 Speed modulation coil 5 Drive circuit 6 Gain variable circuit 7 Frequency characteristic variable circuit 8 Coring amount variable circuit 9 Amplitude limiting amount variable circuit 10 Peaking frequency variable circuit 11 Signal processor 12 CRT

Claims (6)

A ghost removing means , a signal processing means for processing the video signal output from the ghost removing means and supplying it to the video display means, a primary differentiating circuit for differentiating the video signal outputted from the ghost removing means, and a speed wherein in the case where the image quality correcting means due to modulation, and a connected effect varying means to said first derivative circuit for variably controlling the effect of the velocity modulation, removal operation of the ghost is made by the ghost removing means by detecting the operation of the ghost removing means is characterized in that so as to vary the effect of image quality correction means according to the speed modulated by the effect varying means with reducing the effect of contour correction of the video signal in said signal processing means Television receiver. A ghost removing means , a signal processing means for processing the video signal output from the ghost removing means and supplying it to the video display means, a primary differentiating circuit for differentiating the video signal outputted from the ghost removing means, and a speed wherein in the case where the image quality correcting means due to modulation, and a variable gain means connected to the primary differentiating circuit for variably controlling the effect of the velocity modulation, removal operation of the ghost is made by the ghost removing means A television receiver characterized in that an operation of a ghost removing unit is detected to reduce a gain of contour correction of a video signal in the signal processing unit, and a gain of the image quality correcting unit by the speed modulation is changed by the gain variable unit. Machine. A ghost removing means , a video signal processing means for processing the video signal output from the ghost removing means and supplying it to the video display means, a primary differentiating circuit for differentiating the video signal outputted from the ghost removing means, A case in which an image quality correcting means by speed modulation and a frequency characteristic changing means connected to the primary differential circuit for variably controlling the effect of the speed modulation are provided, and a ghost removing operation is performed by the ghost removing means television receiver is characterized in that so as to make reduce a frequency characteristic of the velocity modulation means by detecting and said frequency characteristic variable means an operation of the ghost canceling means. A ghost removing means , a video signal processing means for processing the video signal output from the ghost removing means and supplying it to the video display means, a primary differentiating circuit for differentiating the video signal outputted from the ghost removing means, An image quality correcting means by speed modulation and a coring amount varying means connected to the primary differential circuit for variably controlling the effect of the speed modulation are provided, and the ghost removing operation is performed by the ghost removing means. television receiver is characterized in that so as to make increase the coring amount of image quality correction means according to the velocity modulation by the coring amount varying means detects the operation of the ghost removing means when. A ghost removing means , a video signal processing means for processing the video signal output from the ghost removing means and supplying it to the video display means, a primary differentiating circuit for differentiating the video signal outputted from the ghost removing means, An image quality correcting means by speed modulation; and an amplitude limiting means connected to the first-order differential circuit for variably controlling the effect of the speed modulation, and the ghost removing operation is performed by the ghost removing means. A television receiver characterized by detecting an operation of the ghost removing means and changing an amplitude limit level by the amplitude limit means so that a limit value of a maximum amplitude in the image quality correction means by the speed modulation becomes small . A ghost removing means , a video signal processing means for processing the video signal output from the ghost removing means and supplying it to the video display means, a primary differentiating circuit for differentiating the video signal outputted from the ghost removing means, A case in which image quality correction means by speed modulation and peaking frequency variable means connected to the primary differential circuit for variably controlling the effect of speed modulation are provided, and a ghost removal operation is performed by the ghost removal means A television receiver characterized in that the operation of the ghost removing means is detected and the peaking frequency of the image quality correcting means by the speed modulation is lowered by the peaking frequency varying means .

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