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Hi all, I hope the answer to this question is not too obvious but,…
We have recently been talking about auditory processing models, in specific, temporal
processing models, many of which incorporate an envelope extraction stage. To
do this I’ve seen in many cases the use of half wave rectification
followed by a low pass filter. The cutoff for this filter is generally a pretty
low frequency, say around 50 Hz or so. A colleague suggested that the actual cutoff
frequency should be based on the assumed time constant of the system or
subsystem being evaluated. I’ve been trying to determine the physiologic rational
for such a low frequency filter (slow time constant) in models of auditory
processing. Neural processing limitations like the refractory period of the
neuron are much faster than this. Anyone have a reference or two that might
help explain the physiologic rational for this low frequency filter cutoff? Thanks much, Ben |