Selective call receiver with decoder controlled filters

Details Selective call receiver with decoder controlled filters Selective call receiver with decoder controlled filters

1992-04-01

1993-07-27

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

4551821, 4551823, H04Q 100

Patent

active

052313905

ABSTRACT:
A selective call receiver (100) includes a receiver (1104) for receiving a signal. The receiver (104) includes a controlled filter (142) having a variable frequency response. A decoder (106) coupled to the controlled filter (142) of the receiver (104) decodes the received signal. The decoder (106) has a decoder clock for generating a decoder clock signal (122). A controlled oscillator (134) has an input filter (136) controlled by a control signal (132). The controlled oscillator (134) generates an output signal (140) in response to the control signal (132) for coupling to a comparator (124) which generates the control signal (126) from the decoder clock signal (122) and the output signal (140). The control signal (126) is further coupled to the controlled filter(142) for controlling the frequency response of the controlled filter (142) which filters the received signal.

REFERENCES:
patent: 3626311 (1971-12-01), Kraybill
patent: 4045740 (1977-08-01), Baker
patent: 4281348 (1981-07-01), Shizuya
patent: 4422178 (1983-12-01), Mori
patent: 4472685 (1984-09-01), Dutasta
patent: 4598422 (1986-07-01), Fellman

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