Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1987-07-30
1989-04-18
Tarcza, Thomas H.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
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:
patent: 4163259 (1979-07-01), Skerlos
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.
Barron, Jr. Giberto
Callan Edward W.
General Instrument Corporation
Tarcza Thomas H.
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