Intelligent control system for free sound field batch megaphone amplitude sensitivity and phase measurement device

Abstract

The invention relates to an intelligent control system for a free sound field batch megaphone amplitude sensitivity and phase measurement device, and relates to an automatic control system. The intelligent control system comprises a control center module and a VGA interface module, a host computer interface module, a sensor signal input module, a distance measurement module, a data acquisition andamplitude phase calculation module, an overall device levelness adjustment module, a test bench motion control module, a sound insulation plate motion control module, a microphone located case rear panel control module and an information input and output display module which are connected with the control center module. By means of the control system, the test device can be automatically adjusted, the coordinates of the test device can be automatically positioned, the megaphone amplitude sensitivity and phase can be automatically tested, and the calculation is automatically carried out. The intelligent control system has the advantages of high test speed and high calculation data accuracy.

Description

technical field [0001] The invention relates to an intelligent control system, in particular to an intelligent control system for the amplitude sensitivity and phase measurement device of a free sound field batch microphone. Background technique [0002] Free-field near-field acoustic holography technology is a hot spot in acoustic research in recent years. Near-field acoustic holography (NAH) technology can accurately identify and locate sound sources. Using this technology, near-field acoustic field reconstruction and visualization can be realized. Therefore, the study of NAH technology is of great significance for suppressing noise pollution. An important key of NAH technology is how to measure the complex sound pressure distribution on the holographic surface, that is, to accurately obtain the amplitude of the complex sound pressure on the holographic surface and Otherwise, the calculation result obtained by acoustic inversion using NAH technology will have a large error...

AI Technical Summary

Problems solved by technology

[0002] Free-field near-field acoustic holography technology is a hot spot in acoustic research in recent years. Near-field acoustic holography (NAH) technology can accurately identify and locate sound sources. Using this technology, near-field acoustic field reconstruction and visualization can be realized. Therefore, the study of NAH technology is of great significance for suppressing noise pollution. An important key of NAH technology is how to measure the complex sound pressure distribution on the holographic surface, that is, to accurately obtain the amplitude of the complex sound pressure on the holographic surface and Otherwise, the calculation result obtained by acoustic inversion using NAH technology will have a large error, or even be wrong. To accurately measure the complex sound pressure on the holographic surface, it is necessary to accurately measure the amplitude sensitivity and phase of the microphone itself. Otherwise, the measured complex sound pressure data, especially the phase of the complex sound pressure data, may have a large error. Such data cannot be used for acoustic inversion by NAH technology. The existing devices can only easily measure a single microphone The amplitude sensitivity can hardly be measured, and the debugging and installation are very troublesome. When measuring the amplitude sensitivity and phase of a large number of microphones on the holographic surface in NAH technology, the workload is very large, requiring a lot of manpower and material resources. Therefore, there is a need for a small, lightweight, new type of free-field batch microphone amplitude sensitivity and phase testing device, and a new intelligent control system is invented, so that the device can be controlled by the corresponding intelligent control system. It can automatically test and automatically obtain the amplitude sensitivity and phase value of the batch microphone itself, so as to reduce a lot of manpower and material resources, and reduce people's labor intensity. At the same time, it is especially suitable for large-scale free, complex and stable sound field batch microphone amplitude sensitivity and phase field measurement operations

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