Method for calibrating sound phase instrument

Abstract

The invention relates to a method for calibrating a sound phase instrument, which comprises the steps of: placing sound phase instrument calibrators in front of the sound phase instrument, keeping with a camera in the same line, acquiring sound and optical signals sent by the sound phase instrument calibrators and processing, calculating and storing an x-axis offset correction coefficient Lx and a y-axis offset correction coefficient Ly, placing the sound phase instrument calibrators at top, bottom, left and right positions in front of the sound phase instrument for respectively working, calculating and storing an x-axis scaling correction coefficient Kx and a y-axis scaling correction coefficient Ky, and calibrating the position of a sound image synthesized by real measurement data by using calibration factors of the x-axis offset correction coefficient Lx and the y-axis offset correction coefficient Ly as well as the x-axis scaling correction coefficient Kx and the y-axis scaling correction coefficient Ky. The method is simple and reliable, can be used for rapidly calibrating the offset of the sound phase instrument, and lays the foundation for the accurate work of the sound phase instrument for calibrating the position of the sound image synthesize by the real measurement data.

Description

Technical field [0001] The present invention relates to the field of acoustic measurement, in particular, the present invention relates to a calibration method of a pantograph. Background technique [0002] The positioning of the panning instrument uses its microphone array elements to be arranged in a certain regular shape to collect and convert sound information into digital signals, which are input into the digital signal processor, and beam forming methods are used to realize sound source localization, sound field detection, Eliminate background noise and other functions. However, because the structure of the microphone array element is different during manufacturing and processing, and the assumption of the microphone array element in the digital signal processing positioning algorithm is that the electro-acoustic characteristics are completely consistent, this error will cause serious positioning. Therefore, it is necessary to calibrate the generated sound image. [0003] T...

AI Technical Summary

Problems solved by technology

However, since the structure of the microphone array elements is different during manufacturing and processing, and the assumption of the microphone array elements in the positioning algorithm of digital signal processing is that the electroacoustic characteristics are completely consistent, this error will seriously affect the positioning. , so it is necessary to calibrate the generated sonogram

[0003] The traditional phaser calibration method is to calibrate the microphone array elements one by one by adding a standard sound source to eliminate the difference between the microphone array elements, thus ensuring the correctness of the sound image generated by the panner. However, when the microphone array Calibration becomes time consuming as the number of elements increases

Another method for calibrating the entire pannatron is the fixed reference sound source detection method, which uses a point sound source to emit sound at a specific position for verification and calibration, but this process must be carried out in a specific device, which is An acoustic drum, the walls of which are completely filled with sound-absorbing material of uniform thickness, so the device is very bulky and bulky, not easy to carry, and expensive

Patent 200810213962.X proposes a calibration method, which calculates the acoustic correlation between the audio signal and the noise signal received by each microphone array element, and calculates the average value of the gain when the acoustic correlation exceeds the set correlation threshold to adjust each The gain of the channel achieves the purpose of calibration, but this method has no specific and feasible standards to rely on when setting the correlation threshold, and it is very difficult to select the correlation threshold

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