System and method for AV sync correction by remote sensing

摘要

Method and system for measuring audio video synchronization. This is done by having a remote sensing station to measure and process the audio and images from a multimedia terminal that display a television program. The remote sensing station uses an audio sensor to sense the audio signal from the multimedia station and an image sensor to sense the images displayed on the multimedia station. An AV processing circuit in the remote sensing terminal processes the signals from the audio sensor and the image sensor to determine the relative delay between the sensed audio signal and the sensed images. The delay information is then communicated to the multimedia station to adjust the AV synchronization.

主权项

1. A method for correcting audio video synchronization for a multimedia terminal, where provided are a multimedia terminal, wherein the multimedia terminal includes at least one audio transducer, a video display, and a first communication port; a remote sensing station, wherein the remote sensing station includes an audio sensor, an image sensor, an AV processing circuit, and a second communication port; an audio content and a video content consisting of images, wherein the audio content is played back by the audio transducer(s) and the images are displayed on the video display; said method comprising the steps of:
Sensing audible audio sound played back on a multimedia terminal transducer and sensing visible video images displayed on said multimedia terminal video display with an audio sensor and a video sensor respectively; in response to sound sensed by said audio sensor and images sensed by said video sensor, measuring a lip sync timing difference between the audio played back on the audio transducer(s) and the video displayed on the video display using the AV processing circuit; communicating the timing difference from said AV processing circuit to said multimedia terminal via communications ports; correcting the audio video synchronization of the audio sound and video images provided by the multimedia terminal based on said measured timing difference.