Method of reducing interference components in a frequency modulated signal and device for carrying out said method
AssigneeU.S. Philips Corporation
InventorEeltje de Boer
Life of this patent
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Abstract
A method of reducing interference components in a frequency-modulated carrier signal in which the modulating signal contains a composite color television signal with a chrominance signal modulated on a chrominance subcarrier wave. In addition to the frequency modulation, the carrier signal is pulse-width modulated by the first-order lower side-band component of the frequency-modulated signal produced by the modulated chrominance subcarrier signal.
Claims14
A method of reducing interference components in a frequency-modulated signal, comprising a carrier signal being frequency-modulated by at least one modulating signal of a fixed frequency, wherein the carrier signal is pulse-width modulated by the first-order lower side-band component which is contained in the frequency-modulated signal as a result of the modulating signal.
A device for reducing interference components in a frequency-modulated signal, said signal having a carrier signal which is frequency-modulated by at least one modulating signal at a fixed frequency, wherein the device comprises a modulation device for the pulse-width modulation of the carrier signal by the first order lower side-band component in said frequency-modulated signal.
Dependencies are inferred from the claim text.