BinauraliserNF: Convert filtering method to frequency domain #48
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- Add evalIIRTransferFunction and associated unit tests - Processing function to only update coeffs on changed distatance/direction. - BInauraliser: remove unused var src_dirs. - add `src_dirs_cur` pointer to switch between non/rotated directions. - `doaToIpsiInteraural` returns lateral angle `alpha` to properly parameterize the DVF with changing elevation. - Add binauraliser_nf to README.md
mtmccrea
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What is the goal of this PR?
Convert filtering method of the BinauraliserNF plugin to the frequency domain. This somewhat mitigates artifacts that arise from fast source movement over large angular displacement.
The calculation of the DVF filter was previously based on azimuth, but is not more properly based on the lateral angle, which changes with elevation.
A utility was also added to SAF which returns the magnitude and/or phase of an IIR filter at specific frequencies, which can be useful for frequency domain filtering or graphical representations of EQ curves, etc. There are two versions for coefficients of different numerical resolution: float for more efficient operation but accuracy is limited to lower order filters, and double for accuracy with higher order filters at low frequencies in particular.
What are the changes implemented in this PR?
evalIIRTransferFunctionand associated unit testssrc_dirs_curpointer to switch between non/rotated directions.doaToIpsiInterauralreturns lateral anglealphato properly parameterize the DVF with changing elevation.Binauraliser: remove unused var src_dirs.