The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 09, 1978
Filed:
Apr. 28, 1976
Shanti S Gupta, Naperville, IL (US);
Vijaya K Bhatnagar, Bolingbrook, IL (US);
John F Litster, Naperville, IL (US);
Wescom, Inc., Downers Grove, IL (US);
Abstract
A multi-channel digital echo suppressor wherein analog signals on a plurality of paired transmit and receive lines are sampled and digitized to form an interleaved sequence of parallel digital words. The interleaved digital words are accumulated for a predetermined period to form accumulated sample sums in sequence for each of the respective transmit and receive lines. Means are provided for segregating the receive channel accumulated samples from the transmit channel accumulated samples and bringing the samples for the respective channel pairs back into time correlation. The receive line accumulated samples are sequentially compared against a predetermined reference for producing suppression control signals which are routed to respective suppression controllers for the various channels. At the same time, the transmit line accumulated samples are compared against the time correlated receive line accumulated samples and to a predetermined reference to produce break-in control signals for each channel in sequence. The break-in control signals are monitored by a moving window scanner which selects and monitors the most recent eight break-in control signals for each channel in sequence and produces break-in operating signals when a majority of the samples in the window dictate break-in for that channel. The sequential break-in operating signals are distributed to break-in and receive pad controllers associated with the respective channels.