Audio and video signal synchronization device and method suitable for bubble acoustic research

Abstract

The invention discloses an audio and video signal synchronization device applicable to bubble acoustic research, which comprises a signal generator, a light emitting diode and a loudspeaker. The output end of the signal generator is connected with a three-way joint; the three-way joint is connected with the light emitting diode and the loudspeaker; the light emitting diode is arranged in a shooting range of a camera; and the loudspeaker is arranged beside a hydrophone. The invention further provides an audio and video signal synchronization method applicable to bubble acoustic research. According to the audio and video signal synchronization device and method applicable to bubble acoustic research, which are disclosed by the invention, when sound and video acquisition equipment does not have a trigger function, high-accuracy synchronous testing of audio and video signals can still be implemented.

Description

technical field [0001] The invention belongs to the field of underwater acoustic testing, in particular to an audio and video signal synchronization device and method suitable for bubble acoustic research. Background technique [0002] Hydroacoustic test is the main research method of bubble acoustics. Since the acoustic characteristics of the bubbles are closely related to the shape, size and motion state of the bubbles, it is necessary to record the video and audio of the bubbles synchronously in the experiment. Usually, high-speed cameras are used to record the bubble shape, and hydrophones are used to record the bubble noise. How to accurately synchronize the signals collected by different devices is a key issue that affects the analysis results. [0003] At present, the most common way to solve the sound and video synchronization problem is to use a camera and a signal acquisition card with a trigger function. At the beginning of the test, a pulse signal is used to si...

AI Technical Summary

Problems solved by technology

Although this method is effective, there are two main problems: one is that all the equipment used are required to have a trigger function, which limits the selection of equipment and increases the test investment; the other is that there are difficulties in proofreading. There is a certain reaction delay after triggering the excitation, and the amount of delay determines the level of synchronization accuracy; the calibration of professional instruments has high technical requirements, and it is difficult for ordinary testers to do it

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