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DSP Tower of Babel
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<blockquote data-quote="Bennett Prescott" data-source="post: 44" data-attributes="member: 4"><p>Friends, Romans, Countrymen...</p><p> </p><p>I am going to write an article about different DSP platforms, in an attempt to have a semi-definitive source to point people to the next time I get asked why those Driverack settings sound so funny in the KT processor.</p><p> </p><p>I would be touched if y'all would do me an enormous favor and help me get measurements from different processing platforms. I have designed an imaginary loudspeaker preset that I <em>think</em> will stress the differences in their filter definitions. If anyone thinks they have better ideas, speak now or forever hold your peace. I am trying to make it somewhat realistic while fitting within the filter capabilities every processor is likely to have. Any reasonably mainstream processor welcome. These exact frequencies and bandwidths may not be available (on purpose), please get as close as possible.</p><p> </p><p>If you would like to help, please program these filters into whatever DSP you have at hand:</p><p> </p><p>High Pass - Bessel - 97Hz 18db/octave</p><p>Bell - 280Hz - 2 octaves/0.66 Q -4.5dB</p><p>Bell - 176Hz - 0.6 octaves/2.39 Q +5dB</p><p>Bell - 6.35kHz - 1/8 octave/11.54Q -8dB</p><p>Shelf - 8kHz - 1.6 octave/0.86Q/6dB +5.5dB</p><p> </p><p>Measure with Smaart, using the standard internal pink noise source as a reference. Use 16 averages, 48k sample rate, and 24bit, no smoothing, and set delay compensation using the auto delay finder. Please take a measurement with a 16K FFT and one with MTW (or FPPO for Smaart 5-6). Please send me a Smaart (7 preferable) reference file for each of the two measurements, and if you know how to send an impulse response that might be helpful as well.</p><p> </p><p>Please label your measurements and email them to me, don't post them here... I need to know which processor which measurement came from, but I don't want everyone to know. Anyone who wants to go even further and put in bandwidth instead of Q and take another measurement of that would receive another free Internet.</p><p> </p><p>bennettprescott at gmail dot com</p><p> </p><p>Thanks in advance to those of you with a little time to waste and some measurement chops!</p></blockquote><p></p>
[QUOTE="Bennett Prescott, post: 44, member: 4"] Friends, Romans, Countrymen... I am going to write an article about different DSP platforms, in an attempt to have a semi-definitive source to point people to the next time I get asked why those Driverack settings sound so funny in the KT processor. I would be touched if y'all would do me an enormous favor and help me get measurements from different processing platforms. I have designed an imaginary loudspeaker preset that I [I]think[/I] will stress the differences in their filter definitions. If anyone thinks they have better ideas, speak now or forever hold your peace. I am trying to make it somewhat realistic while fitting within the filter capabilities every processor is likely to have. Any reasonably mainstream processor welcome. These exact frequencies and bandwidths may not be available (on purpose), please get as close as possible. If you would like to help, please program these filters into whatever DSP you have at hand: High Pass - Bessel - 97Hz 18db/octave Bell - 280Hz - 2 octaves/0.66 Q -4.5dB Bell - 176Hz - 0.6 octaves/2.39 Q +5dB Bell - 6.35kHz - 1/8 octave/11.54Q -8dB Shelf - 8kHz - 1.6 octave/0.86Q/6dB +5.5dB Measure with Smaart, using the standard internal pink noise source as a reference. Use 16 averages, 48k sample rate, and 24bit, no smoothing, and set delay compensation using the auto delay finder. Please take a measurement with a 16K FFT and one with MTW (or FPPO for Smaart 5-6). Please send me a Smaart (7 preferable) reference file for each of the two measurements, and if you know how to send an impulse response that might be helpful as well. Please label your measurements and email them to me, don't post them here... I need to know which processor which measurement came from, but I don't want everyone to know. Anyone who wants to go even further and put in bandwidth instead of Q and take another measurement of that would receive another free Internet. bennettprescott at gmail dot com Thanks in advance to those of you with a little time to waste and some measurement chops! [/QUOTE]
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