Originally Posted by audyssey
As far as I know, the Iasys system is based on an implementation of the TDS theory proposed by Dick Heyser several years ago. Audyssey room measurement algorithms are based on an impulse response approach and focus on methods for combining multiple measurements to generate a room representative FIR filter for each channel.
I see your point.
Iasys depends on gathering data in orthogonal (thanks again, jj) domains (time, energy, freq, etc. (whoops, etcetera not "energy time curve"
)) within the limits of the installed environment (ambient noise, loudspeaker bandwidth and power limits, and amp power limits).
The most interesting feature if Iasys is the ability to determine "centroids" of all the measured data and adapt the measuring limits "on the fly"; reducing measurement time and improving granularity of the data by re-ranging (the notorious fuzzy logic part of Iasys).
The resulting data didn't give distance data for the sake of adjusting the difference between drivers to "repair" the situation of listener offset in the stereo field, but rather to allow for alignment between drivers in a common channel (woofs, mids, tweets) as well as for rejection of everything except the first arrival cluster, insuring the ability to descriminate between that which is non-minimum phase (not fixable with eq) and minimum phase (fixable with complementary eq).
In your case it seems that you've taken a different tack..."to generate a room representative FIR filter for each channel". I'm assuming that this is from the measurement microphone's perspective, encompassing the room as it is excited by the individual loudspeakers.
If the assumption is correct, is this a safe model to employ in a non-minimum phase environment?
Thank you for answering,