| 摘要 |
In a multimedia communications system ( 100 ) that supports conference calls that include an audio portion and a video portion, a primary video image is selected from a plurality of video images based on an amount of audio data generated. The amount of audio data is determined by counting a number of audio packets or by counting an amount of audio samples in audio packets ( 204 ). A dominant audio participant is selected if the difference in the amount of audio exceeds a predetermined threshold ( 206 ). If the difference in the amount of audio does not exceed the predetermined threshold ( 206 ), the dominant audio participant may be determined by comparing the loudness or volume for each audio participant ( 207 212 ). The primary video image is selected to correspond to the dominant audio participant ( 208, 214 ). The primary video image remains constant for a predetermined period of time before the possibility to change ( 210, 216 ).
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