Re: Garage Loudspeaker Lab
Yeah TEF functions analogous to Farina's Matched Filtering and Heyser's corrected TDS. It is not the same way that SMAART and Sys-tune function, although the results they produce should be similar, for most systems.
And yes I do agree it (the TEF/Corrected Heyser method) offers many advantages. In fact my own measurement system is based on a similar principle. I also agree with it's disadvantages for live insitu setups. But, anyway, everything I said applies to all systems and is just a general result of the Fourier transform time-bandwidth product.
Okay, here I go again editing. I believe the TEF actually uses Heyser's down convert method so, it's not exactly like the matched filter I described in the post above, although they have been proven to be mathematically equivalent. It has a LP filter which is applied to the baseband signal after it is downconverted/dechirped. You never see this window in action but it's parameters are chosen based on your sweep length/rate. This is the window I speak of, not the one which you apply after the measurement is done. Anyway.
P.S. If you want to talk in terms of spectrum analyzers, you would call this filter/window the resolution bandwidth filter.
