Abstract
A new acoustic measurement signal that is a hybrid signal of time-stretched pulse (TSP), or lin-TSP, and logarithmic TSP (log-TSP) is proposed. The signal, referred to as warped-TSP [Morise et al., IEICE Trans. Fundamentals, A, J89-A(1), 7–14 (2006)], has a single parameter to adjust for better measurements in accordance with ambient noise conditions. It also provides a means to eliminate harmonic distortions produced mainly by loudspeaker systems. In this lecture, the definition and features of the warped-TSP in comparison with the lin-TSP and log-TSP are introduced. The following were shown: (1) the relationship between the parameters, the amplitude frequency characteristics, and the effect on the harmonic distortion components; (2) a method to select the optimal parameters of the warped-TSP for a specific measuring environment; and (3) the experimental results for a series of impulse response measurements under different ambient noise conditions. Those results show that the proposed method outperformed the lin-TSP and log-TSP under all conditions in terms of SNR of the measured impulse response. [This research was supported partly by grants-in-aid for scientific research (15300061 and 15650032) and a grant from the Faculty of Systems Engineering at Wakayama University.]
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