Method for measuring sound absorption coefficient by virtue of cepstrum

• Main Author: ZHU CONGYUN
• Format: Patent
• Language: Chinese; English
• Published: 16.04.2014
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

The invention discloses a method for measuring a sound absorption coefficient by virtue of a cepstrum. The method comprises the steps: applying a sound absorption material on a rigid wall, arranging a loudspeaker just in just front of the sound absorption material, reflecting a sound wave sent by the loudspeaker by virtue of the sound absorption material so as to obtain sound pressure at a microphone, converting the obtained sound pressure to the cepstrum, and comparing the cepstrum with a cepstrum which is obtained by converting sound pressure measured by the microphone after the sound absorption material is removed to obtain a reflection coefficient of the sound absorption material, so as to obtain the sound absorption coefficient of the sound absorption material. With the adoption of the method, the disadvantages of a conventional standing wave pipe method and a conventional reverberation chamber method for measuring the sound absorption coefficient of the sound absorption material are overcome, and a simp