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Lectrosonics Quadra Digital IEM Review
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<blockquote data-quote="Langston Holland" data-source="post: 33450" data-attributes="member: 171"><p>CLIO Cleared of Wrongdoing, Released on own Recognizance</p><p></p><p>CLIO is correct, thus the rest of the FFT world that produces the same time domain results can breathe a sigh of relief. <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=":)" /> I'm joking of course - I'd be shocked if a representative of any of the measurement packages I mentioned read this stuff...</p><p></p><p><u>Background</u>:</p><p></p><p>The latency or group delay measurement in question is analog to analog of my Benchmark ADC1 to DAC1 converters operating at a 48kHz sample rate.</p><p></p><p>My CLIO FFT measurement program reported 3.172ms using a 192kHz resolution, but the phase curve at this delay step was still -10.5 degrees at 20kHz, thus the true latency per CLIO is about 3.173ms.</p><p></p><p><u>Proof</u>:</p><p></p><p>Using a Fluke 192C scope (60MHz) I setup the following: Signal generator producing a 1kHz sine 5ms on / 10ms off. The signal was split so that scope channel A received a direct connection to the generator output and scope channel B got the output of the ADC1-DAC1 chain. For fun I tried both the coax and AES3 links between the Benchmark units and got identical results. Per the attached, the scope measured 3.16ms with the cursor readout and 3.158ms with phase readout. Moving either cursor one step further from the other jumped to 3.20ms, thus the scope could have very well been in perfect agreement with CLIO but unable to report it given the coarse readout.</p><p></p><p>Two perspectives of the same thing:</p><p></p><p><img src="http://homepage.mac.com/soundscapes/PSW/WirelessTests/ADC1-DAC1_Cursor.png" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" /></p><p></p><p><img src="http://homepage.mac.com/soundscapes/PSW/WirelessTests/ADC1-DAC1_Phase.png" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" /></p></blockquote><p></p>
[QUOTE="Langston Holland, post: 33450, member: 171"] CLIO Cleared of Wrongdoing, Released on own Recognizance CLIO is correct, thus the rest of the FFT world that produces the same time domain results can breathe a sigh of relief. :) I'm joking of course - I'd be shocked if a representative of any of the measurement packages I mentioned read this stuff... [u]Background[/u]: The latency or group delay measurement in question is analog to analog of my Benchmark ADC1 to DAC1 converters operating at a 48kHz sample rate. My CLIO FFT measurement program reported 3.172ms using a 192kHz resolution, but the phase curve at this delay step was still -10.5 degrees at 20kHz, thus the true latency per CLIO is about 3.173ms. [u]Proof[/u]: Using a Fluke 192C scope (60MHz) I setup the following: Signal generator producing a 1kHz sine 5ms on / 10ms off. The signal was split so that scope channel A received a direct connection to the generator output and scope channel B got the output of the ADC1-DAC1 chain. For fun I tried both the coax and AES3 links between the Benchmark units and got identical results. Per the attached, the scope measured 3.16ms with the cursor readout and 3.158ms with phase readout. Moving either cursor one step further from the other jumped to 3.20ms, thus the scope could have very well been in perfect agreement with CLIO but unable to report it given the coarse readout. Two perspectives of the same thing: [img]http://homepage.mac.com/soundscapes/PSW/WirelessTests/ADC1-DAC1_Cursor.png[/img] [img]http://homepage.mac.com/soundscapes/PSW/WirelessTests/ADC1-DAC1_Phase.png[/img] [/QUOTE]
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