Single-frequency tone acoustic signal automatic monitoring method based on human auditory characteristics

Abstract

Single-frequency tone acoustic signals are main types in environmental noise. The invention discloses a single-frequency tone acoustic signal automatic monitoring method for environmental noise, and high-accuracy fitting is realized between physical characterization and human auditory characteristics. According to the invention, the real-time acquisition, mathematical description and physical characterization of single-frequency tone acoustic signals are gathered in the method. According to the invention, the A-weighted sound level core algorithm in environmental noise monitoring is improved, a polynomial single-frequency noise correction factor mathematical description relationship in which a logarithmic function is added with a trigonometric function is provided, undetermined coefficient and initial phase angle parameter optimization in the mathematical description relationship can be realized, and through the high-accuracy fitting experimental tests on 40phon equal loudness curves, the fitting absolute error is less than 0.15dB, and a same change rule is found for different- loudness equal loudness curves. The measuring error of a precision sound level meter is about + / -1dB, and the measuring error of an ordinary sound level meter is about + / -3dB. The measuring error of the method adopted in the invention is less than 0.15dB, and the accuracy fully meets the requirements. At present, similar technologies has not yet found.

Description

[0001] technical field [0002] The invention relates to an automatic monitoring method for single-frequency tone-tuned signals based on the auditory characteristics of human ears. [0003] Background technique [0004] Usually people reflect the measured noise level through subjective evaluation parameters. The sound pressure level is the main objective parameter of the acoustic environment quality, and its corresponding subjective parameter is the sound level, which is actually the sound pressure level after weighting correction. The International Organization for Standardization ISO226:2003 and the Chinese National Standard GB / T4963-2007 respectively revised the equal loudness curve, see figure 1 . It can be seen that the equal loudness curve is a curve describing the relationship between sound pressure level and frequency under equal loudness conditions, and is one of the important auditory characteristics. That is, the frequency of the sound is different, and the cu...

AI Technical Summary

Problems solved by technology

A sound level is an international standard. Although it reflects the auditory characteristics of the human ear to a certain extent, it will show a large deviation at certain frequencies.

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