attenuator that works with non-tonal stimuli

[nzjrs]

AFAICT FlyVR 1.0 (https://github.com/murthylab/fly-vr/blob/flyvr-1.0/audio/attenuation.py) and it's port to FlyVR2
(https://github.com/murthylab/fly-vr/blob/master/flyvr/audio/attenuation.py) only ever supported tonal attenuation using interp1d.

Use of a the white-noise transfer file / calibration information was never supported in FlyVR 1.0.

c.f. this with the MATLAB side (fbfd0b4), we are lacking the reverse transform using the white noise transform

[nzjrs]

[--transfer_file TRANSFER_FILE]--transfer_file TRANSFER_FILE
                        A file specifying the transfer function for auditory white noise.]

[nzjrs]

If the frequency for a given stim in the playlist is 0 then it is white noise in which case do:
    -> convolve with the transfer function
    -> multiply by the attenuation factor near frequency = 0 in the attenuation file
    -> Do both 1-2 for the correct channel

If the frequency is not 0, then - 
    -> Find the frequency from the table, and use the corresponding attenuation factor
    -> If Freq does not appear in the table but in the range of frequencies in the table (typically 100-900Hz), interpulate
    -> If <min or >max: through an error

[nzjrs]

tf coefficients

• scipy.io.loadmat('cal20160628_transferFunction_Ca')['mean_ifft_transferFct_voltToStim'].shape -> (1, 10000)
• scipy.io.loadmat('20201119_transferFunction')['mean_ifft_tf_micToStim'].shape -> (1, 44100)