Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1986-09-04
1988-02-23
Masinick, Michael A.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455183, 455164, H04B 116, H04B 126
Patent
active
047275910
ABSTRACT:
A tuning system receives signals from a radio frequency source and supplies an intermediate frequency signal to a signal detector under the control of a microprocessor. The microprocessor reads a channel selector and produces a control voltage which is used to tune the system to the selected channel. The intermediate frequency signal is connected to the microprocessor and a direct measure of the actual IF signal frequency is used by the processor to continuously adjust the tuner to compensate for drifting of the RF signal. In a preferred embodiment, the IF signal increments a counter in the microprocessor for a predetermined period of time to provide a direct measure of the actual IF signal frequency.
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Ahrens, "A Radio Set Phase-Lock Loop (PLL) Using an MC6805T2()2 Single-Chip Microcomputer", Application Note AN-883, Motorola Inc, 1983.
Arvin Industries, Inc.
Masinick Michael A.
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