We present an extension to Pure-data by which users can truly spatialize sound via a pair of loudspeakers, i.e., by “truly spatialize” we mean spatialize monaural sound sources at an arbitrary azimuth, elevation, and distance.
- Head-Related Transfer Functions (HRTFs), can be obtained by recording Impulse Responses (HRIRs) from each ear at dierent angles and distances and can be used in virtual environments to locate sounds.
- The cross-talk between the ipsilateral and contralateral signals must be mitigated, in order to reproduce this spatializations through a pair of loudspeakers.
- Regularize grid: spacing 5º in azimuth and 10 cm in distance.
- Only the right hemisphere HRIRs were stored in a SQLite database for the real-time application.
- Create a Pure-data object named trans˜.
- Get a HRIR using SQLite database and FFT.
- Convolution is computed for every DSP block in Pd (64 samples by default).
- Fresh interpolations are performed only if the location of the virtual source is changed.
- Left outlet outputs the convolved signal for the left loudspeaker
- Right outlet outputs the convolved signal for the right loudspeaker
- See a set of binaural recordings made with this object here:
J. Villegas and T. Ninagawa. Pure-data-based transaural filter with range control. In Proc. 5th Int. Pure Data Convention, Nov 2016.