Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation
Patent
1997-07-07
1999-08-10
Kuntz, Curtis A.
Telecommunications
Receiver or analog modulated signal frequency converter
Local control of receiver operation
4551501, 4551803, 4551831, 331 1, 375354, 375359, 375376, H04B 106, H04B 700
Patent
active
059373393
ABSTRACT:
A frequency-selection device, for selecting a radio-electric signal RF from a number of signals having frequencies which are situated in a given range, includes an oscillator OSC supplying a signal Vco having a variable frequency, a mixer M receiving the radio-electric signal RF and the output signal Vco from the oscillator OSC and supplying a signal FI having a frequency which is equal to the difference between the frequencies of the two signals, a frequency divider DIV supplying a signal Vco/R having a frequency which is equal to the frequency of the output signal Vco from the oscillator OSC, divided by a number R defined by a control signal CMD, a phase detector PD comparing the frequency of the output signal Vco/R from the frequency divider DIV with that of a reference signal Vref and adjusting the frequency of the output signal Vco from the oscillator OSC in the case of difference. This frequency-selection device supplies a signal SYNC which is active when the output signal Vco/R from the frequency divider DIV and the reference signal Vref are synchronous.
REFERENCES:
patent: 4355416 (1982-10-01), Malerba
patent: 4596025 (1986-06-01), Satoh
patent: 4982110 (1991-01-01), Yokogawa et al.
patent: 5128632 (1992-07-01), Erhart et al.
patent: 5682605 (1997-10-01), Salter
Goodman Edward W.
Kuntz Curtis A.
Tieu Binh K.
U.S. Philips Corporation
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