Superheterodyne radio receiver with digital automatic frequency

Details Superheterodyne radio receiver with digital automatic frequency Superheterodyne radio receiver with digital automatic frequency

1991-03-28

1993-11-16

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

4551822, 4551922, 455208, 455257, H04B 1500, H04B 116

Patent

active

052631958

ABSTRACT:
The present invention relates to a radio receiver for receiving a radio signal, a first circuit for beating the signal to zero intermediate frequency in phase and quadrature shifted signals, a circuit for amplifying the in phase and quadrature shifted zero intermediate frequency signals, a second circuit for beating the amplified intermediate frequency signals to predetermined non-zero intermediate frequency in phase and quadrature shifted signals, a summer for summing the non-zero signals, and a circuit for applying the summed signals to a discriminator to obtain an output signal. Other embodiments are extended POCSAG for enhanced battery saving, paging sequence numbers for reception integrity control, digital AFC, script control of the pager for organizer/schedule applications, a vibrator holster for improved pager format and saving of battery power, intelligent low battery detection, and features arising from electronic on/off function.

REFERENCES:
patent: 3697885 (1972-10-01), Avins et al.
patent: 3922609 (1975-11-01), Grohmann
patent: 4403345 (1983-09-01), Granek et al.
patent: 5109544 (1992-04-01), Mittel et al.

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