Damodar Reddy Naturi , pp. 55. ING/School of Engineering, 2012.
The Steered Response Power Phase Transform (SRP-PHAT) is one of the most robust
methods among sound source localization operating in noisy and reverberant environments.
Direction of Arrival (DOA) Estimation has important applications in human computer
interfaces such as video conferencing, speech enhancement and speech recognition.
In this thesis work, SRP-PHAT method has been implemented for 16 element
microphone array arranged into 4 rows and 4 columns in the presence of noise and
reverberation. Computation of TDOA for each pair of microphones in a row setup or a
column setup, generalized cross correlation estimates are calculated and thereby computing
the source position and then by averaging the row wise obtained TDOA values and column
wise obtained TDOA values, best accurate source position can be determined.
Weighted Overlap and Add (WOLA) filter bank is used in SRP-PHAT method to find
the TDOA in frequency domain. Original TDOA's and estimated TDOA's obtained from
SRP-PHAT are compared to analyse the performance of the SRP-PHAT method. Mean
estimation error and Standard deviation are calculated to find the accuracy of the estimated
values of TDOA.