An Efficient Algorithm for Measuring the Impulse Response Using Pseudorandom Noise
The impulse response of a linear system can be determined by exciting the system with white noise, and cross-correlating the input and output. As contrasted with the straightforward technique suing an impulsive excitation, this approach is capable of providing vastly superior dynamic range. In order to minimize the amount of computation required by the cross-correlation step, the system can be excited by a binary maximal-length sequence, and the cross correlation performed using the fast Hadamard transform. By this means, only additions are required, and the number of additions is approximately 2.5n log(2) n, where n is the length of the sequence.
Click to purchase paper as a non-member or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!
This paper costs $33 for non-members and is temporarily free for AES members.