Impulse noise reduction system for TV receivers
First Claim
Patent Images
1. A television receiver for processing broadcast picture and sound signals comprising:
- circuitry responsive to a control signal for reducing the effects of electrical noise present in the picture signal; and
noise detection circuitry responsive to said sound signals for generating said control signals.
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Abstract
A television receiver having circuitry for reducing the effects of impulse noise in the video signal is controlled by impulse noise detection circuitry responsive to the accompanying sound signal. Since impulse noise is relatively broadband it will occur simultaneously in both the broadcast picture and accompanying sound signals. Amplitude variations of the frequency modulated sound signal are indicative of the presence of noise, which variations are detected and utilized to generate a control signal whenever the noise amplitude exceeds a predetermined threshold.
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Citations
17 Claims
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1. A television receiver for processing broadcast picture and sound signals comprising:
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circuitry responsive to a control signal for reducing the effects of electrical noise present in the picture signal; and noise detection circuitry responsive to said sound signals for generating said control signals.
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2. In a television receiver of the type having a tuner for frequency translating selected broadcast television signals to a signal comprising an amplitude modulated IF picture signal and an associated frequency modulated sound signal, having further processing circuitry for conditioning said IF picture signal to a video signal for display on a kinescope and said sound signal to baseband audio, and having noise compensation circuitry associated with said processing circuitry, said compensation circuitry responsive to a control signal for reducing effects of electrical noise in the video signal, circuitry for generating said control signal comprising:
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means for detecting amplitude variations in the frequency modulated sound signal indicative of the presence of noise in the video signal; and circuitry responsive to said detected amplitude variations for producing a control pulse equivalent to said control signal whenever said amplitude variations exceed a predetermined threshold signal. - View Dependent Claims (3, 4, 5, 6)
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7. In a televison receiver of the type for reproducing video images and accompanying sound signals broadcast on designated picture and sound RF carrier frequency signals and having a tuner circuit for selectively translating particular RF broadcast signals to intermediate frequency signals, having detector circuitry for reducing the intermediate frequency signals to baseband video and sound signals and further processing circuitry for conditioning the baseband video signal for display on a kinescope, circuitry for reducing impulse noise in the baseband video signal comprising:
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means for delaying said baseband video signal by a predetermined period; means responsive to amplitude deviations in said sound signal corresponding to impulse noise thereon for generating a control signal; and means responsive to said control signal for substituting undelayed baseband video signal applied to said further processing circuitry with said delayed video signal. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification