Audio-Visual Corpus Homepage.
GCC-PHAT Cross-Correlation. GCC-PHAT Cross-Correlation The computation of the time delay of arrival (TDOA) between each of the considered channels and the reference channel is repeated along the recording in order for the beamforming to respond to changes in the speaker.
In this implementation it is computed every 250ms (called segment size or analysis scroll) over a window of 500ms (called the analysis window) which covers the current analysis segment and the next. The size of the analysis window and of the segment size constitute a tradeoff. A big analysis window or segment window lead to a reduction in the resolution of changes in the TDOA. The Fundamentals of FFT-Based Signal Analysis and Measurement in LabVIEW and LabWindows/CVI. 1.
Basic Signal Analysis Computations The basic computations for analyzing signals include converting from a two-sided power spectrum to a single-sided power spectrum, adjusting frequency resolution and graphing the spectrum, using the FFT, and converting power and amplitude into logarithmic units. The power spectrum returns an array that contains the two-sided power spectrum of a time-domain signal.