Micro-controller based frequency calibration

Micro-controller based frequency calibration

A radio modem is disclosed that includes a radio receiver for receiving radio signals comprising data frequency multiplexed onto a carrier signal having a carrier frequency. An oscillator generates a reference frequency for an FM discriminator, which is connected to the antenna and to the for demodu...

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Hauptverfasser: DIFRANCISCO, LOUIS R, TRAINOR, MICHAEL J, RAUSCH, KRIS
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
BASIC ELECTRONIC CIRCUITRY
BROADCAST COMMUNICATION
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
SELECTING RESONANT CIRCUITS
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
TUNING RESONANT CIRCUITS
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creator DIFRANCISCO, LOUIS R
TRAINOR, MICHAEL J
RAUSCH, KRIS
description A radio modem is disclosed that includes a radio receiver for receiving radio signals comprising data frequency multiplexed onto a carrier signal having a carrier frequency. An oscillator generates a reference frequency for an FM discriminator, which is connected to the antenna and to the for demodulating said data from said radio signals using said reference frequency. A microprocessor has an input connected to the output of the FM discriminator. The microprocessor also has an output. The microprocessor is programmed to sample the signal voltage output by the FM discriminator, average the signal voltage samples, and compare the average to a preset voltage. The microprocessor is programmed so that if the average differs from the preset voltage, the microprocessor generates an error signal at the microprocessor output. The oscillator is coupled to the microprocessor output so that the error signal adjusts the frequency of the oscillator.
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An oscillator generates a reference frequency for an FM discriminator, which is connected to the antenna and to the for demodulating said data from said radio signals using said reference frequency. A microprocessor has an input connected to the output of the FM discriminator. The microprocessor also has an output. The microprocessor is programmed to sample the signal voltage output by the FM discriminator, average the signal voltage samples, and compare the average to a preset voltage. The microprocessor is programmed so that if the average differs from the preset voltage, the microprocessor generates an error signal at the microprocessor output. 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subjects BASIC ELECTRONIC CIRCUITRY
BROADCAST COMMUNICATION
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
SELECTING RESONANT CIRCUITS
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
TUNING RESONANT CIRCUITS
title Micro-controller based frequency calibration
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