Pulse or digital communications – Receivers – Automatic baseline or threshold adjustment
Patent
1993-12-10
1995-10-03
Chin, Stephen
Pulse or digital communications
Receivers
Automatic baseline or threshold adjustment
375322, 375324, H04L 2500, H04L 2700
Patent
active
054558450
ABSTRACT:
A circuit arrangement is disclosed that performs one or all of the functions selected from the group comprising (1) establishing a threshold level for detecting and encoding selected parameters of RF signals; (2) establishes a threshold level that corresponds to a signal-to-noise ratio (SNR) and which is used for detecting and encoding selected parameters of RF signals; and (3) determining the tangent angle of the received RF signals which is further used for measuring the frequency of the RF signal. The circuit arrangement comprises a microwave correlator including a power divider, a delay line, a quadrature coupler, and two multipliers. The circuit arrangement further comprises an RF amplifier, a bandpass filter, low pass filters, analog-to-digital converters, and preferably a PROM. The microwave correlator splits the RF signals between two paths, with one path being delayed with respect to the other, and then multiplies delayed RF signals with the undelayed RF signals to provide a video signal containing both sine and cosine information. The sine and cosine information are converted to digital representations which are used to provide any of the three features of the present invention.
REFERENCES:
patent: 4871975 (1989-10-01), Nawata et al.
patent: 5268647 (1993-12-01), Ichiyoshi
patent: 5345187 (1994-09-01), McGuire
Chin Stephen
Vo Don N.
Wide Band Systems, Inc.
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