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:
Mar. 28, 2000
Filed:
Aug. 21, 1997
Peter Rigstad, Salt Lake City, UT (US);
Nathan Whitney, W. Jordan, UT (US);
3COM Corporation, Santa Clara, CA (US);
Abstract
A method and apparatus for implementing a speakerphone within a personal computer having a voice-capable modem and an audio board is provided. The personal computer executes host software providing the user interface for speakerphone operation and the indirect interconnection for audio data routing between the voice-capable modem and the audio board without requiring physical jumpering between the modem and audio board. For half duplex speakerphone operation, the host software performs switching between transmit and receive modes by monitoring received audio signal energy levels and switching accordingly. For full duplex operation of the voice-capable modem, the modem's DSP provides echo cancellation of locally generated echoes. Also, for full duplex operation of the audio board, the host software provides echo cancellation for acoustic echoes generated by the speaker audio feeding into the user's microphone.