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A Windows 7 Measurement Rig
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<blockquote data-quote="Langston Holland" data-source="post: 23595" data-attributes="member: 171"><p>Re: A Windows 7 Measurement Rig</p><p></p><p></p><p></p><p>Good point as always. <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f642.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":)" title="Smile :)" data-smilie="1"data-shortname=":)" /></p><p></p><p>Ultimately, the IR has everything in it that disturbed the equilibrium of the atmospheric pressure around the measurement mic capsule. Not that we can correlate everything we hear with that perturbation at this point, but we have come a long way toward that goal. ARTA is fluent with the IR and can acquire it via internal or external stimuli as well as file import. A very cool additional feature is that its real time module can export a transfer function measurement into an IR for analysis simply by clicking on the IR module icon while making (or pausing) the real time measurement. Nothing ground breaking here, FFT and its inverse, but ARTA makes it extremely convenient.</p><p></p><p>My decision to catalog 10 sec two channel wave files of the actual measurements has several advantages over just recording a snapshot of the IR:</p><p></p><p>1. I can loop this recording through a loudspeaker processor to make adjustments as if I were actually doing the measurement. Looping an IR pulse through a loudspeaker processor does not mimic what occurs in the real world even if you could get it to work.</p><p></p><p>2. I'm able to confidence monitor the magnitude and phase traces with Smaart and ARTA during the recording to make sure I get a good 10 sec's of data. This sometimes involves recording more than 10 sec's and using a wave editor to delete the data when the wind messed with the phase trace. <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f642.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":)" title="Smile :)" data-smilie="1"data-shortname=":)" /></p><p></p><p>3. I can loop the measurement recording through ARTA and pause it at any time I feel best to derive the IR from an inverse FFT of same - by clicking on a button! What a cool time to be alive. <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f642.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":)" title="Smile :)" data-smilie="1"data-shortname=":)" /></p><p></p><p></p><p></p><p>I wish! I loved Win2k with audio stuff in the day, but the problem is that within my new laptop's lifespan there will be audio software I'll want that won't work without Win7. I'm just happily surprised with how well Win7 handles audio I/O for a non-realtime OS, thus I can focus on what I'm doing instead of how to make the dumb computer work - like OSX (for the most part).</p></blockquote><p></p>
[QUOTE="Langston Holland, post: 23595, member: 171"] Re: A Windows 7 Measurement Rig Good point as always. :) Ultimately, the IR has everything in it that disturbed the equilibrium of the atmospheric pressure around the measurement mic capsule. Not that we can correlate everything we hear with that perturbation at this point, but we have come a long way toward that goal. ARTA is fluent with the IR and can acquire it via internal or external stimuli as well as file import. A very cool additional feature is that its real time module can export a transfer function measurement into an IR for analysis simply by clicking on the IR module icon while making (or pausing) the real time measurement. Nothing ground breaking here, FFT and its inverse, but ARTA makes it extremely convenient. My decision to catalog 10 sec two channel wave files of the actual measurements has several advantages over just recording a snapshot of the IR: 1. I can loop this recording through a loudspeaker processor to make adjustments as if I were actually doing the measurement. Looping an IR pulse through a loudspeaker processor does not mimic what occurs in the real world even if you could get it to work. 2. I'm able to confidence monitor the magnitude and phase traces with Smaart and ARTA during the recording to make sure I get a good 10 sec's of data. This sometimes involves recording more than 10 sec's and using a wave editor to delete the data when the wind messed with the phase trace. :) 3. I can loop the measurement recording through ARTA and pause it at any time I feel best to derive the IR from an inverse FFT of same - by clicking on a button! What a cool time to be alive. :) I wish! I loved Win2k with audio stuff in the day, but the problem is that within my new laptop's lifespan there will be audio software I'll want that won't work without Win7. I'm just happily surprised with how well Win7 handles audio I/O for a non-realtime OS, thus I can focus on what I'm doing instead of how to make the dumb computer work - like OSX (for the most part). [/QUOTE]
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