Investigations on the method for the estimation of impulse response using a rectangular pulse.
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概要
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This paper proposes a method to measure the impulse response of a system with long reverberation using a rectangular pulse as the source signal. The progress of digital device has provided us with various useful digital equipments such as a howling-cancel system. To realize the system, it is necessary to estimate the impulse response. Aresponse to a pulsive signal has been used, for example, to estimate the reverberation time. However, since the pulsive signal is not equal to the impulse, cross-spectral technique is necessary to estimate the impulse response, and much computation time is required to compute many discrete Fourier transforms. On the other hand, we propose a method using a rectangular pulse with a finite amplitude. Under some conditions developedin this paper, the response of the system to the rectangular pulse can be approximately equal to the impulse response. Therefore, it is not necessary to compute Fourier transforms, and the method requires the least amount of computations. We describe first the conditions to estimate the impulse response accurately using a rectangular pulse. Next, an index is introduced to evaluate the accuracy of the estimated impulse response. Using this index, the conditions are investigated in detail by computer simulations. Actual room experiments are also carried out to show that the evaluation method by the index is actually effective in practical cases, where there are external noises.
- 一般社団法人 日本音響学会の論文
一般社団法人 日本音響学会 | 論文
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