Radio communication receiving device detecting a frequency modul

Details Radio communication receiving device detecting a frequency modul Radio communication receiving device detecting a frequency modul

1993-07-07

1995-09-19

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at separate stations

455205, 455343, 3403111, 34082544, H04B 116

Patent

active

054524725

ABSTRACT:
A radio communication receiving device performs prescribed operations upon detecting a frequency modulation preamble signal consisting of a series of alternating logical values. The device includes a low-pass filter that is connected to an output of a receiver that detects the frequency modulation signal and outputs an analog base band signal, and which has a numerical cutoff frequency value that does not exceed half the bit rate of the preamble, a comparison circuit that is connected to the output of the low-pass filter and compares an output voltage of the low-pass filter with prescribed threshold values, and a determining circuit that determines a preamble has been detected when the comparison by the comparison circuit indicates that an absolute value the low-pass filter output voltage does not exceed a prescribed threshold value for a prescribed time period.

REFERENCES:
patent: 4839639 (1989-06-01), Sato et al.
patent: 5142699 (1992-08-01), Sato et al.
patent: 5230084 (1993-07-01), Nguyen

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