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US 7,587,017 B2Granted
Carrier phase synchronization system for improved amplitude modulation and television broadcast reception
AssigneeUT-Battelle, LLC
InventorsStephen F. Smith, James A. Moore
Life of this patent
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Abstract
Systems and methods are described for carrier phase synchronization for improved AM and TV broadcast reception. A method includes synchronizing the phase of a carrier frequency of a broadcast signal with the phase of a remote reference frequency. An apparatus includes a receiver to detect the phase of a reference signal; a phase comparator coupled to the reference signal-phase receiver; a voltage controlled oscillator coupled to the phase comparator; and a phase-controlled radio frequency output coupled to the voltage controlled oscillator.
Claims17
An apparatus, comprising:
- a first multichannel receiver for detecting the phase of a reference signal;
- a first phase comparator coupled to the first multichannel reference signal receiver;
- a first voltage-controlled oscillator coupled to the first phase comparator;
- a first amplitude-modulated radio-frequency output coupled to the first voltage-controlled oscillator;
- a second multichannel receiver for detecting the phase of a reference signal;
- a second phase comparator coupled to the second multichannel reference signal receiver;
- a second voltage-controlled oscillator coupled to the second phase comparator;
- and
- a second amplitude-modulated radio-frequency output coupled to the second voltage-controlled oscillator, wherein the first amplitude-modulated radio-frequency output and the second amplitude-modulated radio-frequency output provide a group of co-channel signals whose carrier frequencies and phases thereof are synchronized to:
- (a) substantially eliminate audible and sub-audible beats between a local desired station's carrier signal and one or more interfering stations' carriers;
- and
- (b) substantially reduce distortion effects in the signals as received in the coverage area overlapped by the two or more signals.
9 more elements
Dependencies are inferred from the claim text.