System and method for testing synchronization of audio and video

Abstract

The invention relates to the technical field of testing of audio and video devices, and in particular relates to a system and a method for testing the synchronization of an audio and a video. The system and the method can be applied to a synchronization test of an audio and video synchronous transmission playing device, and particularly can simply and accurately achieve a performance test of an audio and video synchronous transmission playing system (such as a building security and protection system and a video communication system) with a high requirement on audio and video synchronization performance, namely a video delay time and an audio delay time of the audio and video synchronous transmission playing device can be simply, accurately and feasibly acquired by respectively using a video delay test device and an audio delay test device, and the audio and video synchronization performance of the audio and video synchronous transmission playing device can be accurately learned by comparing the acquired video delay time with the acquired audio delay time.

Description

technical field [0001] The invention relates to the technical field of audio and video equipment testing, in particular to a system and method for synchronous audio and video testing. Background technique [0002] In the audio and video synchronous transmission system, there are many digital end-to-end devices that use non-standard interfaces or non-standard transmission protocols or adopt encryption technology. The timing is different, and then there will be defects such as lip-sound out-of-sync during video calls, especially in applications that require high audio-video synchronization performance such as real-time remote audio-video communication, which will greatly reduce the user experience of audio-video equipment; For example, in the current building intercom system of residential security technology prevention products, when a visitor presses the room number on the visitor calling machine at the door of the building, when the owner of the indoor receiver hears the ca...

AI Technical Summary

Problems solved by technology

[0002] In the audio and video synchronous transmission system, there are many digital end-to-end devices that use non-standard interfaces or non-standard transmission protocols or adopt encryption technology. The timing is different, and then there will be defects such as lip-sound out-of-sync during video calls, especially in applications that require high audio-video synchronization performance such as real-time remote audio-video communication, which will greatly reduce the user experience of audio-video equipment; For example, in the current building intercom system of residential security technology prevention products, when a visitor presses the room number on the visitor calling machine at the door of the building, when the owner of the indoor receiver hears the calling sound and answers, it is best to respond in time. View the real-time image of the visitor, so that the owner can more accurately identify who the visitor is, and in order to enable the indoor receiver to hear the caller's voice and watch the caller's appearance at the same time, it is necessary to enable the device to achieve lip synchronization. , and once the lip sounds are not synchronized, it will not only reduce the user experience, but also make it impossible for the host to identify the identity of the visitor, which will bring security risks

[0003] At present, in order to improve the audio-video synchronization performance of the remote audio-video communication equipment developed or tested to be widely used, the electrical signal-image signal test method is generally used for testing (such as lip synchronization test, etc.), but due to its use such as Interfaces, video equipment, etc. may be non-standard, so only end-to-end full image signal testing can be used, which will make the test effect unsatisfactory, that is, it is impossible to accurately obtain the audio and video synchronization performance of the current equipment under test, thus It is also impossible to prepare for the evaluation of the performance of the product developed or to be promoted

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