Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Patent
1998-01-15
1999-07-20
Chin, Wellington
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
455352, 455339, 455340, 455266, H04Q 718
Patent
active
059267526
ABSTRACT:
A system (10) for remote convenience control of performance of a function includes a portable transmitter unit (14) and a receiver unit (18). In one embodiment, the system (10) is a remote convenience vehicle system. The transmitter unit (14) transmits a signal (16). The signal has a RF frequency at an unknown value within a range of values and conveys a message that contains a function request. Within the receiver unit (18) is superheterodyne circuitry (32) that has a mixer (44). The mixer (44) mixes a RF signal (42) coming from an antenna (28) and a reference frequency signal from a reference oscillator (46), and outputs an intermediate frequency signal (50) conveying the message. A bandpass filter (66) filters the intermediate frequency signal to pass a range of frequency values smaller than a known range of intermediate frequency values. Tuning control circuitry (70) automatically adjusting the bandpass range of the bandpass filter (66) to vary the bandpass range over the intermediate frequency range. Passage detector circuitry (72) senses the intermediate frequency signal passing through the bandpass filter (66) and automatically causes the adjustment of the bandpass range to stop.
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Chin Wellington
TRW Inc.
Woldetatios Yemane
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