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<blockquote data-quote="Mark DeArman" data-source="post: 137525" data-attributes="member: 950">Re: Garage Loudspeaker LabYeah TEF functions analogous to Farina&#039;s Matched Filtering and Heyser&#039;s corrected TDS.&nbsp; It is not the same way that SMAART and Sys-tune function, although the results they produce should be similar, for most systems. &nbsp;And yes I do agree it (the TEF/Corrected Heyser method) offers many advantages.&nbsp; In fact my own measurement system is based on a similar principle. I also agree with it&#039;s disadvantages for live insitu setups.&nbsp; 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.&nbsp;&nbsp; I believe the TEF actually uses Heyser&#039;s down convert method so, it&#039;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.&nbsp; You never see this window in action but it&#039;s parameters are chosen based on your sweep length/rate.&nbsp; This is the window I speak of, not the one which you apply after the measurement is done.&nbsp; Anyway.P.S. If you want to talk in terms of spectrum analyzers, you would call this filter/window the resolution bandwidth filter.</blockquote>

[QUOTE="Mark DeArman, post: 137525, member: 950"] 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. [/QUOTE]

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