| 摘要 |
The present invention relates to a method and apparatus for synchronising sound and images in a real-time multimedia communication, such as an audio-video telephone call, through a network gateway (101), when the source and/or the destination of the audio signals, and optionally also the video signals, is from and/or to separate audio and video communication devices (104, 105), for example audio telephony and video telephony devices. The method comprises the steps of: i) providing an audio signal and a video signal; ii) supplying as an input to the gateway (101) the audio signal and optionally also the video signal so that said signal(s) is/are routed through the gateway (101) to the multimedia terminal (108); iii) detecting any mismatch in the synchronisation between the audible and visible outputs from the audio device (104) and the video device (105) owing at least partly to the intrinsic gateway processing delay(s); iv) adjusting a variable delay in the gateway (101) on a signal routed through the gateway (101) until the audible and visible outputs from the separate devices are effectively synchronised; and v) storing the variable delay in the gateway (101) for future use. |
