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Title: Synchronizing carrier frequencies of co-channel amplitude-modulated broadcast

Abstract

Systems and methods are described for carrier-frequency synchronization for improved AM and TV broadcast reception. A method includes synchronizing a carrier frequency of a broadcast signal with a remote reference frequency. An apparatus includes a reference signal receiver; a phase comparator coupled to the reference signal receiver; a voltage controlled oscillator coupled to the phase comparator; and a radio frequency output coupled to the voltage controlled oscillator.

Inventors:
 [1];  [2]
  1. London, TN
  2. Powell, TN
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
Sponsoring Org.:
USDOE
OSTI Identifier:
909403
Patent Number(s):
7,218,696
Application Number:
10/304,338
Assignee:
UT-Battelle, LLC (Oak Ridge, TN) ORO
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION

Citation Formats

Smith, Stephen F, and Moore, James A. Synchronizing carrier frequencies of co-channel amplitude-modulated broadcast. United States: N. p., 2007. Web.
Smith, Stephen F, & Moore, James A. Synchronizing carrier frequencies of co-channel amplitude-modulated broadcast. United States.
Smith, Stephen F, and Moore, James A. Tue . "Synchronizing carrier frequencies of co-channel amplitude-modulated broadcast". United States. doi:. https://www.osti.gov/servlets/purl/909403.
@article{osti_909403,
title = {Synchronizing carrier frequencies of co-channel amplitude-modulated broadcast},
author = {Smith, Stephen F and Moore, James A},
abstractNote = {Systems and methods are described for carrier-frequency synchronization for improved AM and TV broadcast reception. A method includes synchronizing a carrier frequency of a broadcast signal with a remote reference frequency. An apparatus includes a reference signal receiver; a phase comparator coupled to the reference signal receiver; a voltage controlled oscillator coupled to the phase comparator; and a radio frequency output coupled to the voltage controlled oscillator.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue May 15 00:00:00 EDT 2007},
month = {Tue May 15 00:00:00 EDT 2007}
}

Patent:

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  • 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.
  • 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.
  • Systems and methods are described for carrier-frequency synchronization for improved AM and TV broadcast reception. A method includes synchronizing a carrier frequency of a broadcast signal with a remote reference frequency. An apparatus includes a reference signal receiver; a phase comparator coupled to the reference signal receiver; a voltage controlled oscillator coupled to the phase comparator; and a radio frequency output coupled to the voltage controlled oscillator.
  • The synchronizing mechanism for the unfolding of articulated carrier elements which are outwardly extendable or inwardly retractable in a bellows-type arrangement on each side of a satellite body comprises a system of gear-train units placed alternately at one end of a driving carrier element. The mechanism is adapted to cooperate with at least one drive motor for folding-back or unfolding the carrier elements.
  • Systems and methods are provided for pulse-width modulated control of power inverter using phase-shifted carrier signals. An electrical system comprises an energy source and a motor. The motor has a first set of windings and a second set of windings, which are electrically isolated from each other. An inverter module is coupled between the energy source and the motor and comprises a first set of phase legs coupled to the first set of windings and a second set of phase legs coupled to the second set of windings. A controller is coupled to the inverter module and is configured tomore » achieve a desired power flow between the energy source and the motor by modulating the first set of phase legs using a first carrier signal and modulating the second set of phase legs using a second carrier signal. The second carrier signal is phase-shifted relative to the first carrier signal.« less