Measurement of Loudspeaker Radiation Pattern with Matlab

Radiation pattern measurement of a loudspeaker using Sound card.

The code presented here concerns the radiation pattern measurement of a loudspeaker. The measurement technique is based on generation of a sine-wave tone signal, reproduction of the signal by the loudspeaker and measurement of the SPL by measurement microphone. The measurement is repeating for different angles, via loudspeaker rotation (by the user). The transfer function (i.e. the amplitude ratio of the output/input signal) is calculated for every one of the angles and finally the radiation pattern is plotted. For better results, a data strobe is performed and StobeChoice.m file is provided, so one can choose the range of the input data used for the measurements. The code provides:
1) plot of the radiation pattern of the loudspeaker;
2) data.txt file with the measurement results (for post-processing).

The code is based on the theory described in:

[1] H. Zhivomirov, I. Iliev. Radiation Pattern Measurement with Matlab Implementation. Journal of the Technical University of Gabrovo, ISSN: 1310-6686, Vol. 52, pp. 73-76, 2016. (http://epubl.tugab.bg/documents/cat_view/46-----/61--52-----)