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How can I reduce the noise from my outside air conditioner?

Standard deviation

Linear regression

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Open access•Journal Article•DOI Low-Frequency Noise Reduction in Dual-Fiber Optical Trap Using Normalized Differential Signal of Transmission Lights Tengfang Kuang, Guangzong Xiao, Wei Xiong, Xiang Han, Xinlin Chen, Jie Yuan - Show less +5 more 25 Jun 2018-IEEE Photonics Journal 4 Citations	We propose a technique that can reduce such noise.
Journal Article•DOI Review of recent research on interior noise of propeller aircraft J. S. Mixson, Clemans A. Powell - Show less +1 more 01 Nov 1985-Journal of Aircraft 45 Citations	Noise from internal sources, such as air-conditioning systems, may also be important.
Journal Article•DOI Identification of Noise Sources in Scroll Compressor for Air-Conditioner Jin Kab Lee 01 Jun 2000-Ksme International Journal 3 Citations	Therefore, noise reduction in a compressor is quite significant as an element technology in the air-conditioner field.
Open access•Proceedings Article•DOI Contributions of Different Aeroacoustic Sources toAircraft Cabin Noise Nan Hu, Heino Buchholz, Michaela Herr, Carsten Spehr, Stefan Haxter - Show less +4 more 27 May 2013 23 Citations	Contrary to that the air conditioning system noise is of minor importance.
Journal Article•DOI Sound quality evaluation of air-conditioner noise based on factors of the autocorrelation function Yoshiharu Soeta, Ryota Shimokura - Show less +1 more 01 Sep 2017-Applied Acoustics 27 Citations	The multiple regression analyses indicated that the total subjective annoyance caused by air-conditioner noise can be predicted using the delay time and amplitude of the first maximum peak of the ACF (τ 1 and ϕ 1 ) and the SD of ϕ 1 .
Journal Article•DOI On noise indices for domestic air conditioners Shiu Keung Tang, M. Y. Wong - Show less +1 more 06 Jul 2004-Journal of Sound and Vibration 23 Citations	Results show that the Zwicker's loudness level and the percentile level of 90% exceedence are the two major indices for air-conditioner noise assessment.
Open access•Journal Article•DOI Disturbance caused by residential air conditioner noise J. S. Bradley 01 Apr 1993-Journal of the Acoustical Society of America 24 Citations	Acceptable limits for air conditioner noise levels can be derived from the dose response curves produced in this study.
Journal Article•DOI Sound quality evaluation of air-conditioner noise based on factors of the autocorrelation function Yoshiharu Soeta, Ryota Shimokura - Show less +1 more 01 Sep 2017-Applied Acoustics 27 Citations	The results indicated that the noise characteristics caused by each air conditioner and each operating level are determined by L Aeq , and by the width of the first decay of the ACF, W ϕ (0) , which corresponds to the spectral centroid.

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