Conference_programme: 21.1 - Source localization and acoustic array processing
Lecture: Array processing for echo cancellation in the measurement of Head-Related Transfer Functions
Author(s): Lopez Jose J., Martinez Sergio, Gutierrez-Parera Pablo
Summary:
The use of Head-Related Transfer Functions (HRTF) is necessary for individualizing binaural sound for each subject so as to provide a better experience. For measuring HRTF, motorized positioning systems and anechoic chambers are usually employed, which implies the utilization of expensive and complex facilities that are not always available. Measurement in normal rooms would be desirable, but reflections which are not part of a HRTF would be introduced. In this paper, a method to cancel these echoes by means of signal processing techniques allowing to measure in non-anechoic rooms is proposed. The sound field is captured by using a spherical array of microphones, placed where the listener will be situated, and obtaining the room impulse response (RIR) between each loudspeaker position and each microphone of the array. The use of array techniques as Plane Wave Decomposition (PWD) allow to discriminate direction of reflections. The proposed system is a sub-band method, where the higher frequency part of the HRTF is obtained by cropping the first segment of the RIR before the first reflection and the lower one by using array techniques. Two spherical microphones of different diameter will be compared for this task.
Corresponding author
Name: Prof Jose Javier Lopez
e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Country: Spain
