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:
Apr. 13, 2004
Filed:
Dec. 21, 1998
Raymond Paul Dell, Arlington, TX (US);
Greg Osterhout, Coppell, TX (US);
Randolph Wheatley, Richardson, TX (US);
Nortel Networks Limited, St. Laurent, CA;
Abstract
A telephone feature can be implemented within a Digital Multiplex Switch (DMS) in order to mute a telephone handset's voice path at the telephone network level. In this DMS, a Digital Tone Multi-Frequency (DTMF) receiver monitors for a predefined sequence of DTMF buttons being pressed on the particular handset, that being the * button followed by two other digits. When the DMS detects such a code, it interrupts the transmit path of the particular handset by opening a switch within the cross-connection switch matrix, therefore removing from the telephone session any background acoustic noise at the particular muted telephone handset and any electrical noise within the transmission line between the muted handset and the DMS. This feature is particularly useful during teleconferencing sessions, in which numerous parties are not contributing to the call, but must listen to the discussion.