Noise removal method and device based on room pulse response repetition measurement

Abstract

The invention relates to a noise removal method and device based on room pulse response repetition measurement. The method comprises steps that a sweep frequency signal is emitted by a signal emissionmodule; 2), the voltage sound pressure is acquired by a signal acquisition module; 3), noised pulse response is calculated through a before-de-noising pulse response calculation module; 4), signal tonoise ratio determination is carried out through a signal to noise ratio determination module; 5), the measurement frequency is determined by a measurement frequency determination module; 6), a de-noising method is selected by a signal pre-analysis module; 7), multi-time measurement signals are superposed through a superposition de-noising module; 8), time frequency coefficient reconstruction ofthe multi-time measurement signals is carried out through a time frequency coefficient reconstruction de-noising module; 9), room pulse response after de-noising is calculated through a post-de-noising pulse response calculation module; 10), a timbre parameter is calculated through a timbre parameter calculation module; and 11), test signal characteristics before and after de-noising and the timbre parameter are displayed through a result display and storage module, and the calculation result is further stored. Compared with the prior art, the method is advantaged in that anti-noise capabilityand precision of on-site timbre measurement can be effectively enhanced.

Description

technical field [0001] The invention relates to measurement technology in the field of acoustics, in particular to a noise removal method and device based on repeated measurement of room impulse responses. Background technique [0002] The impulse response is an important physical quantity that reflects the sound quality of the hall. From the impulse response, the reverberation time (RT60), early decay time (EDT), clarity factor (D50), clarity factor (C50), loudness factor (G ), binaural correlation coefficient (IACC) and other hall sound quality parameters. Accurately measuring hall impulse response acoustic signals is of great significance to the development of room acoustic design, sound quality acceptance, environmental noise control technology and engineering practice. The on-site impulse response measurement process is often disturbed by voice, traffic and construction equipment noise, especially on-site measurement with spectators or during construction, the interfer...

AI Technical Summary

Problems solved by technology

As stipulated in ISO3382, for the measurement of reverberation time, the measurement is only effective when the signal-to-noise ratio reaches 35dB. However, except for the laboratory and the quiet environment in the middle of the night, it is difficult to achieve such a high signal-to-noise ratio in field measurement

Usually, the test will be invalid when the signal-to-noise ratio is less than 25dB, so anti-noise technology is very necessary for the on-site measurement of impulse response

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