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Hybrid M Sequences for Room Impulse Response Estimation

The measurement of the Room Impulse Response is often evaluated in the presence of non-stationary noise showing a rms value and a power spectral density that significantly varies with time. Under these conditions, the mean square value, MS, of the sequence must be minimized to improve the overall SNR. This suggests that the analysis should be performed by considering the energy of the noise in the time domain and in the frequency domain. A modified MLS measurement method working in the time and in the frequency domain for applications in the room acoustics field is presented. Experimental results obtained in real conditions are described and shown in the paper. The new approach, the Hybrid Sequences technique proved to lead to a significant increase of the SNR, when compared with the classical MLS technique.

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