Sounding body abnormal sound detection method and system

Abstract

The present invention provides a method and system for synthesized applying of a series of psychological techniques such as high-level weak signal extraction and human auditory mental model in conventional audio measurement unit and measuring the abnormal sound of the abnormal sound of a sound producer. The present invention adopts a special signal to excite the sound producer to be tested; obtains an abnormal sound curve by measuring current signals and sound pressure signals at both ends of the sound producer and performing time-domain tracking high-pass filtering or EMD process to the two kinds of signals; performing post-processing to the audio response abnormal sound curve by considering the human auditory mental model, to obtain a final audio response abnormal sound curve; and then combining the electrical response abnormal sound. This method can fast and accurately detect whether the abnormal sound exists, which is suitable for production line use.

Description

technical field [0001] The invention relates to a method and a test system for detecting abnormal sound of a sounding body. After stimulating the sounding body with a special signal to obtain the electric response and acoustic response of the sounding body, the abnormal sound curve is obtained by performing time-domain tracking high-pass filtering or EMD processing on the two signals, and then considering the human auditory psychological model on the acoustic response. The abnormal sound curve is post-processed to obtain the final acoustic response abnormal sound curve. Combining the electrical response abnormal sound curve and the acoustic response abnormal sound curve can comprehensively judge whether there is abnormal sound in the sounding body. Background technique [0002] Significance of measuring vocal abnormalities: [0003] The abnormal sound of the sounding body usually occurs in the development and mass production of the sounding body. In the research and develop...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that 1. The use of discrete frequency excitation signals means that the excitation signals are not generated in the entire set frequency band, so that some abnormal sounds that are only triggered at specific frequencies may not be triggered under such excitation

2. A simple high-pass instead of a high-pass filter that tracks fundamental frequency changes makes this method powerless in distinguishing between normal harmonic distortion and high-order abnormal sounds

3. This method has great contradictions in detection accuracy and test speed

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