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Frequency Response/Contour EQ in full range systems.
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<blockquote data-quote="Phil Graham" data-source="post: 35666" data-attributes="member: 430"><p>Re: Frequency Response/Contour EQ in full range systems.</p><p></p><p></p><p></p><p>Nick,</p><p></p><p>I caught Jamie heading out for PLASA. As I suspected, the results you show would be similar for SMAART 7. For those in the peanut gallery, I apologize in advance for the specificity of this, and the lack of exposition. I've got to go pound the pavement, so this is going to be succinct. Here we go:</p><p></p><p>For SMAART 7: <ol> <li data-xf-list-type="ol">Sample continuously - multiple frames with frame overlap</li> <li data-xf-list-type="ol">Decimate</li> <li data-xf-list-type="ol">Anti alias filtering</li> <li data-xf-list-type="ol">Multiple DFTs with Hann window</li> <li data-xf-list-type="ol">A fraction of each DFT corresponds to the sample points in a portion of the spectrum</li> <li data-xf-list-type="ol">Combine them all together to form the final response with equivalent per octave resolution</li> </ol><p>There is no "secondary" windowing for the early energy. Your 4k boost shows up in a later frame, so the energy is there, but the correlation will be awful, and you can know to exclude the data. Of course you would hear delayed energy at 4kHz standing in the space, so SMAART is doing a useful representation</p><p></p><p>As I also use Systune, there you can apply a time window (or multiple windows) to the real time IR. I haven't tried it (BECAUSE IT HAS FORGOTTEN MY LICENSE AGAIN!) but Systune should exclude your delayed copy of the energy as you expect.</p></blockquote><p></p>
[QUOTE="Phil Graham, post: 35666, member: 430"] Re: Frequency Response/Contour EQ in full range systems. Nick, I caught Jamie heading out for PLASA. As I suspected, the results you show would be similar for SMAART 7. For those in the peanut gallery, I apologize in advance for the specificity of this, and the lack of exposition. I've got to go pound the pavement, so this is going to be succinct. Here we go: For SMAART 7:[LIST=1] [*]Sample continuously - multiple frames with frame overlap [*]Decimate [*]Anti alias filtering [*]Multiple DFTs with Hann window [*]A fraction of each DFT corresponds to the sample points in a portion of the spectrum [*]Combine them all together to form the final response with equivalent per octave resolution [/LIST]There is no "secondary" windowing for the early energy. Your 4k boost shows up in a later frame, so the energy is there, but the correlation will be awful, and you can know to exclude the data. Of course you would hear delayed energy at 4kHz standing in the space, so SMAART is doing a useful representation As I also use Systune, there you can apply a time window (or multiple windows) to the real time IR. I haven't tried it (BECAUSE IT HAS FORGOTTEN MY LICENSE AGAIN!) but Systune should exclude your delayed copy of the energy as you expect. [/QUOTE]
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