| 摘要 |
<p>A videoconferencing system has a videoconferencing unit that use portable devices as peripherals for the system. The portable devices obtain near-end audio and send the audio to the videoconferencing unit via a wireless connection. In turn, the videoconferencing unit sends the near-end audio from the loudest portable device along with near-end video to the far-end. The portable devices can control the videoconferencing unit and can initially establish the videoconference by connecting with the far-end and then transferring operations to the videoconferencing unit. To deal with acoustic coupling between the unit's loudspeaker and the portable device's microphone, the unit uses an echo canceller that is compensated for differences in the clocks used in the A/D and D/A converters of the loudspeaker and microphone. 82 01 5 7 2 4 * 1 0 7 Videoconferencing Unit Processing Unit~- 120 r112I 13 + -- - -Inte rface C o ec73 142 10 11 ? EW AN VdoVideo Interface Codec 3 z Far-End 1166 144 Con~FG. 150 1</p> |
