Abstract: When the air-conditioner compressor runs, the pressure of refrigerant in the pipeline system will drive the piping system to generate the pulsating noise at a certain frequency, that is the transmission of the compressor in the air conditioning industry. According to the user's complaints from compressor transmission ring “buzz" sound, the muffler exhaust pipe of the compressor is arranged on the right, and through the theoretical calculation and experimental study of the selection of muffler, and through the experimental study and obtained a method using spectrum analysis technique and to improve air conditioning noise by increasing the silencer in the exhaust pipe the improved air conditioner Noise quality.

Key words: Pulsating noise, Silencer, Spectrum analysis