Noise Removal Method and Device Based on Repeated Measurement of Room Impulse Response

Abstract

The invention relates to a noise removal method and device based on repeated measurement of room impulse response, comprising: 1) a signal transmitting module sends out a frequency sweep signal; 2) a signal acquisition module collects room sound pressure; 3) an impulse response calculation module before denoising calculates Noise-containing impulse response; 4) Signal-to-noise ratio determination module determines signal-to-noise ratio; 5) Measurement times determination module determines measurement times; 6) Signal pre-analysis module selects denoising method; 7) Overlay denoising module performs multiple measurement signal Superposition; 8) time-frequency coefficient reconstruction denoising module to perform time-frequency coefficient reconstruction on multiple measurement signals; 9) denoised impulse response calculation module calculates denoised room impulse response; 10) sound quality parameter calculation module calculates Sound quality parameters; 11) Result display and storage module, which displays the test signal characteristics and sound quality parameters before and after denoising, and saves the calculation results. Compared with the prior art, the invention can effectively improve the anti-noise ability and precision of on-site sound quality measurement.

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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