Refined tuning of RF receiver with frequency-locked loop

Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency

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455209, 455260, 455316, 331 22, 331 41, 3581951, H03D 716, H03J 704, H04N 550

Patent

active

048233994

ABSTRACT:
In an RF receiver having a phase-locked loop demodulator and FLL tuning in its RF converter, the frequency of the VCO output signal in the phase-locked loop (PLL) demodulator is controlled indirectly by the FLL in the RF converter in response to a measurement of the VCO output signal in the phase-locked loop demodulator and comparison of such measured signal to a predetermined intermediated frequency. A microcomputer performs a refined FLL tuning algorithm to tune a selected RF carrier input signal and audio subcarrier input signals. The algorithm provides a means of assuring that the PLL demodulator is responding to an input signal derived from a carrier signal of a selected input frequency without having to use hardware to detect the presence of a carrier signal.

REFERENCES:
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patent: 4298988 (1981-11-01), Dages
patent: 4306310 (1981-12-01), Malinowski et al.
patent: 4575761 (1986-03-01), Carlson et al.
patent: 4658438 (1987-04-01), Kamata et al.
patent: 4709408 (1987-11-01), Itakura et al.

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