Method and apparatus for a host-based personal computer speakerp

Details Method and apparatus for a host-based personal computer speakerp Method and apparatus for a host-based personal computer speakerp

1997-08-21

2000-03-28

Weaver, Scott L.

Telephonic communications

Substation or terminal circuitry

Conversion of signal form

379380, 379 9305, H04M 120

Patent

active

06044150&

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.

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