Pulse sound generation based on time-domain inverse filter

In order to improve the frequency response of loudspeaker and generate a stable and repeatable broadband pulse sound, a new technique of pulse sound generation based on time-domain inverse filter is proposed. Firstly, Maximum Length Sequence (MLS) is utilized to measure the impulse response of the loudspeaker. Then, an inverse filter is designed with Least Squares (LS) rule and Minimum Mean Square Error (MMSE) rule respectively. Finally, by exciting the loudspeaker with pre-filtered voltage signal, the desired Butterworth pulse sound can be produced successfully. Experimental results and their analysis show preliminarily that both inverse filter methods are effective, which can be applied in pulse sound generation and provide a solution to real-time online acoustic measurement in the field.