Signal processor for reducing interference between frequency-modulated signals
OwnerFrank Anthony Griffithsinventor
Life of this patent
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Abstract
A method of reducing the interference between the sideband of a first carrier which is frequency-modulated by a video signal and a second carrier which is frequency-modulated by an audio signal, comprising increasing the amplitude of the second carrier signal and decreasing at least those sideband components of the first carrier in the region of the second carrier as those components tend to increase to interfere with the second carrier.
Claims6
A method of reducing the interference between a primary frequency-modulated carrier signal and a secondary frequency-modulated carrier signal, comprising both increasing the amplitude of the secondary frequency-modulated carrier signal and decreasing at least those sideband components of the primary carrier signal in the region of the secondary carrier signal as those sideband components tend to increase to interfere with the secondary carrier signal.
A processor for the reduction of interference between a primary frequency-modulated signal and a secondary frequency modulated carrier signal, comprising a detector for detecting the amplitude of sideband components of the primary carrier signal in the region of the secondary carrier signal;
- a modulator for modulating the amplitude of the secondary carrier signal;
- a filter for controlling at least the said sideband components of the primary carrier signal;
- and
- means for controlling both the modulator and the said filter in response to the detected amplitude of the said components so as, respectively, to increase the amplitude of the secondary carrier signal as the amplitude of the said sideband components increases and to decrease the amplitude of said sidebands at least when those sidebands tend to exceed a threshold.
Dependencies are inferred from the claim text.