VIR control apparatus for color television receiver
First Claim
1. Color television receiving apparatus for receiving a composite color television signal including horizontal synchronizing signals, color burst signals and luminance and chrominance components, the composite color television signal being of the type which additionally may include a VIR signal provided in a predetermined line interval during the vertical retrace interval, said apparatus comprising signal processing means for processing said received composite color television signal to produce a video picture therefrom;
- signal generating means for generating sampling signals during the predetermined line intervals in which said VIR signal is provided;
detecting means coupled to said signal processing means and responsive to said sampling signals to detect if said VIR signal is included in said received composite color television signal;
sampling means responsive to said sampling signals for sampling at least one component produced by said signal processing means to produce sampled control signals;
manually operable means for producing manually adjustable control signals;
switch means coupled to said sampling means and to said manually operable means and having output means, said switch means being controlled by said detecting means to selectively supply said sampled control signals to its output means if the VIR signal is detected and to supply said manually adjustable control signals to its output means if the VIR signal is not detected; and
control means responsive to the control signals selectively supplied to said output means of said switch means for controlling said signal processing means, thereby controlling predetermined chracteristics of said video picture.
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Accused Products
Abstract
Color television receiving apparatus is provided for receiving a composite television signal which includes horizontal synchronizing signals, color burst signals and luminance and chrominance components. The composite color television signal is of the type which additionally may include a VIR signal which is provided in a predetermined line interval during the vertical retrace interval. The receiving apparatus comprises signal processing circuitry for processing the received composite color television signal so as to produce a video picture therefrom. A sampling signal generator generates sampling signals during the predetermined line intervals in which the VIR signal is provided. A VIR detector is coupled to the signal processing circuitry and is responsive to the sampling signals to detect if the VIR signal is included in the received composite color television signal. At least one component produced by the signal processing circuitry is sampled by the sampling signals to produce sampled control signals. A manually adjustable generator produces manually adjustable control signals; and switching circuitry coupled to the sampling circuitry and to the manually adjustable generator is controlled by the VIR detector to selectively supply either the sampled control signals or the manually adjustable control signals to control circuitry which, in turn, controls the signal processing circuitry so as to control predetermined characteristics of the reproduced video picture. These controlled characteristics may be the luminance levels or color characteristics, such as hue and saturation, or both luminance levels and color characteristics. An improved type of sampling circuit which can be used with this color television receiving apparatus also is disclosed.
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Citations
21 Claims
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1. Color television receiving apparatus for receiving a composite color television signal including horizontal synchronizing signals, color burst signals and luminance and chrominance components, the composite color television signal being of the type which additionally may include a VIR signal provided in a predetermined line interval during the vertical retrace interval, said apparatus comprising signal processing means for processing said received composite color television signal to produce a video picture therefrom;
- signal generating means for generating sampling signals during the predetermined line intervals in which said VIR signal is provided;
detecting means coupled to said signal processing means and responsive to said sampling signals to detect if said VIR signal is included in said received composite color television signal;
sampling means responsive to said sampling signals for sampling at least one component produced by said signal processing means to produce sampled control signals;
manually operable means for producing manually adjustable control signals;
switch means coupled to said sampling means and to said manually operable means and having output means, said switch means being controlled by said detecting means to selectively supply said sampled control signals to its output means if the VIR signal is detected and to supply said manually adjustable control signals to its output means if the VIR signal is not detected; and
control means responsive to the control signals selectively supplied to said output means of said switch means for controlling said signal processing means, thereby controlling predetermined chracteristics of said video picture. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
- signal generating means for generating sampling signals during the predetermined line intervals in which said VIR signal is provided;
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2. Color television receiving apparatus for receiving a composite color television signal including horizontal synchronizing signals, color burst signals and luminance and chrominance components, the composite color television signal being of the type which additionally may include a VIR signal provided in a predetermined line interval during the vertical retrace interval, said VIR signal including a luminance reference level;
- said apparatus comprising signal processing means for processing said received composite color television signal to produce a video picture therefrom including means for separating the luminance and chrominance components from said received composite color television signal, and luminance amplifying means for amplifying said separated luminance component;
signal generating means for generating sampling signals during the predetermined line intervals in which said VIR signal is provided;
detecting means coupled to said signal processing means and responsive to said sampling signals to detect if said VIR signal is included in said received composite color television signal;
sampling means responsive to said sampling signals for sampling at least the luminance component produced by said signal processing means to produce a sampled luminance reference level;
manually operable means for producing manually adjustable control signals;
switch means coupled to said sampling means and to said manually operable means and having output means, said switch means being controlled by said detecting means to selectively supply said sampled luminance reference level to its output means if the VIR signal is detected and to supply said manually adjustable control signals to its output means if the VIR signal is not detected; and
control means including luminance gain control means responsive to the luminance reference level and control signals selectively supplied to said output means of said switch means for selectively controlling the gain of said luminance amplifying means. - View Dependent Claims (3, 4, 5)
- said apparatus comprising signal processing means for processing said received composite color television signal to produce a video picture therefrom including means for separating the luminance and chrominance components from said received composite color television signal, and luminance amplifying means for amplifying said separated luminance component;
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20. Color television receiving apparatus for receiving a composite color television signal including horizontal synchronizing signals, color burst signals and luminance and chrominance components, the composite color television signal being of the type which additionally may include a VIR signal provided in a predetermined line interval during the vertical retrace interval, the VIR signal having a luminance reference component and a chrominance reference component, said apparatus comprising means for separating said luminance and chrominance components from said composite color television signal;
- luminance amplifying means for amplifying the separated luminance component;
demodulating means for demodulating the separated chrominance component into color signal components;
sampling signal generating means for generating luminance reference sampling signals and chrominance reference sampling signals during the predetermined line intervals in which said VIR signal is provided;
detecting means responsive to the received composite color television signal for detecting whether said VIR signal is present;
luminance sampling means coupled to said luminance amplifying means and responsive to said luminance reference sampling signals for sampling the amplified luminance component during said predetermined line intervals;
manually adjustable luminance reference signal means for providing a luminance reference signal;
luminance switch means coupled to said luminance sampling means and to said luminance reference signal means and responsive to said detecting means for selectively transmitting the sampled luminance component or the luminance reference signal;
luminance control means coupled to said luminance switch means for controlling said luminance amplifying means with the signal selectively transmitted by said luminance switch means;
chrominance sampling means coupled to said demodulating means and responsive to said chrominance reference sampling signals for sampling at least one of the color signal components produced by said demodulating means during said predetermined line intervals;
manually adjustable color reference signal means for providing at least one color reference signal;
chrominance switch means coupled to said chrominance sampling means and to said color reference signal means and responsive to said detecting means for selectively transmitting the at least one color signal component or the at least one color reference signal; and
chrominance control means coupled to said chrominance switch means for controlling said demodulating means with the at least one signal selectively transmitted by said chrominance switch means. - View Dependent Claims (21)
- luminance amplifying means for amplifying the separated luminance component;
Specification