Pulse or digital communications – Apparatus convertible to analog – Muting circuit and squelch
Patent
1996-08-01
1998-12-01
Le, Amanda
Pulse or digital communications
Apparatus convertible to analog
Muting circuit and squelch
375326, 375329, 375360, 455212, 455218, 329304, H04L 2718
Patent
active
058449388
ABSTRACT:
A method for providing improved carrier based data operated squelch (CDOS) includes routines for recovering the carrier signal and for analyzing the received signal. The received signal is sampled at each transition point of the carrier signal as well as the halfway points between the transition points. In addition, extra samples are taken between these samples. Using the samples, a carrier locked loop routine recovers the carrier signal. A CDOS routine analyzes the extra samples to determine the presence of data. If two successive samples are different, this means that a transition has occurred. The CDOS routine analyzes these transitions to determine whether the input signal is encoded with data. If the CDOS routine determines that the input signal is encoded with data, a CDOS counter is incremented. As the input continues to look like data, the value by which the CDOS counter is incremented is increased. When the CDOS counter reaches a certain threshold, the CDOS mutes the output circuit.
REFERENCES:
patent: 4450573 (1984-05-01), Noble
patent: 4455664 (1984-06-01), Burke
Ehlers Douglas E.
Hupp Mark R.
Snyder Kenneth L.
Le Amanda
Transcrypt International, Inc.
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