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:
Jun. 29, 2004
Filed:
Mar. 14, 2000
Chieh-Wen Tsai, Santa Barbara, CA (US);
Cisco Technology, Inc., San Jose, CA (US);
Abstract
A device is provided for coupling between a telephone line and the network, to exchange data between them. The invention includes software for the device, and methods of operation. The device detects when, in a fax/modem type transmission, the transmitted data encode silence or voice. This determines the end of the fax/modem type transmission, and then the device is switched to a more economical voice mode. The device analyzes the energy of the encoded signals. The device makes a discrimination of the type of signals (fax/modem, silence or voice) based on the time patterns of the energy. For fax/modem the pattern is relatively uniform, for silence it is uniformly low, and for voice the pattern oscillates.