Pulse or digital communications – Receivers – Automatic frequency control
Patent
1996-01-31
1998-10-20
Chin, Stephen
Pulse or digital communications
Receivers
Automatic frequency control
375216, 375316, 4551822, H04L 2700, H04L 2706
Patent
active
058258337
ABSTRACT:
A digital and analog reception apparatus includes a first mixer (MIX1) which converts up a reception signal having an input frequency fa inputted into an input terminal IN and a second mixer (MIX2) which converts down a first intermediate frequency fc of a signal outputted from the first mixer (MIX1) by using a second local frequency fd and a second intermediate frequency fe. The apparatus is also provided with a phase-locked loop (PLL), an automatic frequency controller (AFC) which comprises a second local oscillator and a low frequency band pass filter unit LPF adjusts a second local frequency fd, and a microcomputer discriminates an analog/digital distinction of the reception signal having the input frequency fa. Upon receiving an analog signal, the digital and analog reception apparatus deactivates a low-pass filter unit LPF, thereby having an AFC signal control a second local oscillator. On the other hand, upon reception of a digital signal, the phase-locked loop (PLL) and the low-pass filter unit LPF control the second local oscillator.
REFERENCES:
patent: 4320530 (1982-03-01), Ikeda
patent: 5163159 (1992-11-01), Rich et al.
patent: 5203032 (1993-04-01), Usui
patent: 5355532 (1994-10-01), Kubo et al.
patent: 5418815 (1995-05-01), Ishikawa et al.
patent: 5493714 (1996-02-01), Cahill
Chin Stephen
Deppe Betsy L.
Mattson Brian M.
Mitsumi Electric Co. Ltd.
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