Maximum-length sequences (MLS) are widely used for measurement of impulse responses of linear time-invariant systems in acoustic and audio systems. It is usually believed that one of the drawbacks of the MLS technique is a requirement of synchronized devices used for the generation and acquisition of the MLS signals. This study shows that the MLS technique can easily be improved and applied to devices that are not synchronous, or operate at different sampling frequencies. To show the efficiency of the proposed modification to MLS technique, the authors provided several experiments, as for example, a measurement with devices working at 44.1 kHz on the generation side and 96 kHz on the acquisition side, or a measurement of the frequency response function of an inexpensive mobile phone in which the synchronous clocking is not possible. Modifications to the classical MLS method are easy to implement and do not require excessive computational cost.
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