Squelch circuit

Details Squelch circuit Squelch circuit

1989-06-30

1991-03-26

Safourek, Benedict V.

Pulse or digital communications

Spread spectrum

Direct sequence

455218, 328118, H04B 110

Patent

active

050035568

ABSTRACT:
A squelch circuit is disclosed that distinguishes between noise impulses and valid packets of data transmitted over a transmission line such as a twisted pair media within a local area network. The squelch circuit converts supplied data into a stream of positive and negative pulses and detects a sequence of positive and negative pulses quantified in time based on prior knowledge of the characteristics of a valid packet of data and permits the supplied data to pass if it has the characteristics of a valid packet of data or prohibits the supplied data from passing if it does not have the characteristics of a valid packet of data.

REFERENCES:
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patent: 3521172 (1970-07-01), Harmon
patent: 3780727 (1973-12-01), King
patent: 3889197 (1975-06-01), Duff
patent: 4038605 (1977-07-01), Elder et al.
patent: 4086430 (1978-04-01), Brown
patent: 4479252 (1984-10-01), Souchay et al.
patent: 4575683 (1986-03-01), Roberts et al.
patent: 4617677 (1986-10-01), Chiba
patent: 4815108 (1989-03-01), Oda
patent: 4827514 (1989-05-01), Ziolko

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