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<blockquote data-quote="Mark DeArman" data-source="post: 147885" data-attributes="member: 950"><p>Re: FIR filters</p><p></p><p>I'll have to look, I think there is an AES paper/conference proceeding/letter with regards to this, including experimental results. (Heyser maybe?) <a href="http://www.aes.org/e-lib/browse.cfm?elib=4526" target="_blank">http://www.aes.org/e-lib/browse.cfm?elib=4526</a></p><p></p><p>In radar, they solve this issue by building a dictionary of matched filters for different back-scatters. Then the recorded signal is dechirped, and the matched filters applied for the signal path and back-scatter. The goal being a sinc function with constant phase.</p><p>This works with audio too, you can calibrate by making your matched filter. </p><p></p><p> Obviously the unknown system problem is a bit different, and if you are trying to cross over two sources, with arbitrary filter designs, I'm not sure I would think about it in terms of a global reference, since your goal is constant/equal group delay across the pass band, given ANY global reference. So you should be able to design your FIR filter to land a sinc function with linear phase on the same position when you measure?</p><p></p><p>Both matched filters should have some constant group delay or excess phase and the difference should be the delay between the two sources. Given you run them over the same bandwidth while you are experimenting.</p><p></p><p>I just got a couple of the four-audio Hd2 DSPs in the lab so I'll have to play around with it.</p></blockquote><p></p>
[QUOTE="Mark DeArman, post: 147885, member: 950"] Re: FIR filters I'll have to look, I think there is an AES paper/conference proceeding/letter with regards to this, including experimental results. (Heyser maybe?) [url]http://www.aes.org/e-lib/browse.cfm?elib=4526[/url] In radar, they solve this issue by building a dictionary of matched filters for different back-scatters. Then the recorded signal is dechirped, and the matched filters applied for the signal path and back-scatter. The goal being a sinc function with constant phase. This works with audio too, you can calibrate by making your matched filter. Obviously the unknown system problem is a bit different, and if you are trying to cross over two sources, with arbitrary filter designs, I'm not sure I would think about it in terms of a global reference, since your goal is constant/equal group delay across the pass band, given ANY global reference. So you should be able to design your FIR filter to land a sinc function with linear phase on the same position when you measure? Both matched filters should have some constant group delay or excess phase and the difference should be the delay between the two sources. Given you run them over the same bandwidth while you are experimenting. I just got a couple of the four-audio Hd2 DSPs in the lab so I'll have to play around with it. [/QUOTE]
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