Measurement of the reverberation time of a passenger car compartment is important because it is a major parameter in determining the absorption rates of the absorptive materials used inside a car. However, it has been difficult to measure this reverberation time using a traditional method because the reverberation time is very short. A short reverberation time makes the value of the BT product of filter bandwidth B and reverberation time T small. In order to measure the reverberation time with accuracy using a traditional method, the value of this BT product has to be at least 16. To overcome this problem, the wavelet transform- based method using a wavelet filter bank, has been used for the measurement of very short reverberation times of a passenger car compartment, and the results are compared with the traditional method, which uses an infinite impulse response filter.
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