Detector of the presence of a transmission in a modem

Details Detector of the presence of a transmission in a modem Detector of the presence of a transmission in a modem

1995-09-11

1997-04-15

Bocure, Tesfaldet

Pulse or digital communications

Receivers

Automatic baseline or threshold adjustment

375222, H03K 900, H04L 2706, H04L 2714, H04L 2772

Patent

active

056217650

ABSTRACT:
A detector of the presence of a transmission in a modem, including a circuit for determining the absolute value of a receive signal, a first averaging block of the absolute value and two first comparators with respect to two predetermined detection and loss thresholds of a transmission, and further including a second averager which is associated with two second comparators with respect to predetermined extreme thresholds which englobe the two detection and loss thresholds, the first averager having a high time constant with respect to the time constant of the second averager.

REFERENCES:
patent: 4534034 (1985-08-01), Krishnan
patent: 4541101 (1985-09-01), Potage et al.
patent: 4674103 (1987-06-01), Chevillat et al.
patent: 4969207 (1990-11-01), Sakamoto et al.
patent: 5018190 (1991-05-01), Walker
patent: 5040194 (1991-08-01), Tjahjadi et al.
French Search Report from French Patent Application No. 94 11211, filed Sep. 14, 1994.

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