Microprocessor controlled tuning system
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United States of America Patent
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-
Feb 23, 1988
Grant Date -
N/A
app pub date -
Sep 4, 1986
filing date -
Sep 4, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
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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