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(MOVED) - FIR discussion spinoff
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<blockquote data-quote="Michael John" data-source="post: 41587" data-attributes="member: 830"><p>Re: (MOVED) - FIR discussion spinoff</p><p></p><p>Hi Kimo,</p><p></p><p>Just to add to Bennett's points, I believe the reason FIR works as it does in methods like Gunness focusing is that the effects being tamed are spatially localised, fairly predictable and fairly consistent. Effects such as certain horn resonances or horn shape characteristics. At mid and lower frequencies, other effects come into play including the cabinet's interaction with adjacent cabinets and the room and weather effects. These effects are not consistent, and tuning FIR impulse response correction filters in these ranges could lead to worse performance.</p><p></p><p>One example. Years ago I designed a simple concept system to do active reverberation in small rooms. (Not the first by any means.) The speaker to mic equalization was done using ~8000 tap FIR filters (@ 48 kHz). Naturally, the system operated close to the edge of feedback. Every hour or two I had to re-measure the impulse responses due to temperature changes in the room. People moving through the room also affected the system stability.</p><p></p><p>Best,</p><p>Michael</p></blockquote><p></p>
[QUOTE="Michael John, post: 41587, member: 830"] Re: (MOVED) - FIR discussion spinoff Hi Kimo, Just to add to Bennett's points, I believe the reason FIR works as it does in methods like Gunness focusing is that the effects being tamed are spatially localised, fairly predictable and fairly consistent. Effects such as certain horn resonances or horn shape characteristics. At mid and lower frequencies, other effects come into play including the cabinet's interaction with adjacent cabinets and the room and weather effects. These effects are not consistent, and tuning FIR impulse response correction filters in these ranges could lead to worse performance. One example. Years ago I designed a simple concept system to do active reverberation in small rooms. (Not the first by any means.) The speaker to mic equalization was done using ~8000 tap FIR filters (@ 48 kHz). Naturally, the system operated close to the edge of feedback. Every hour or two I had to re-measure the impulse responses due to temperature changes in the room. People moving through the room also affected the system stability. Best, Michael [/QUOTE]
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