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| radiolistener:
--- Quote from: loop123 on April 03, 2024, 08:53:05 pm ---Also I need display software where it can do automatic real time filtering such as real time high pass filter. What software can do it? Audacity cant. Mathcad cant do real time display and its too complex. Just want to try it with user friendliness like Audacity. --- End quote --- matlab can do it |
| JeremyC:
@loop123 I read both your threads. Are you a bot? Putting all of your concepts together... it doesn’t’ make sense… |
| loop123:
--- Quote from: ebastler on April 03, 2024, 09:51:47 pm --- --- Quote from: loop123 on April 03, 2024, 09:37:47 pm ---Its good you mentioned it. I nearly ordered it. What other least expensive oscilloscope with superb quality that can do better than E1DA ADC + Audacity combo with ability to interface to pc to capture the output for Mathcad etc processing in computer? --- End quote --- Which aspect of the E1DA + PC + Audacity combination are you unsatisfied with?? If your frequency range of interest is the audio range or a subset of it, and you want low noise and low distortion, I don't think you can find any oscilloscope which can outperform that solution -- even at ten times your $200 price range and more. Oscilloscopes are designed for significantly higher bandwidth. That drives cost (or limits the number of bits an affordable ADC can provide) and has an adverse effect on noise. --- End quote --- Someone told me "Audio ADC's just aren't well suited to voltage signal measurements.". How true is it? If E1DA ADC is not suitable for voltage signal measurements. Then what good ADC like it that can do that? He said: "For audio equipment, the dynamic range is highly dependent on the frequency. At very low frequencies, very little dynamic range is needed. Audio ADC's just aren't well suited to voltage signal measurements. Proper (non-audio) voltage ADCs try their best to convert the measured voltage to a digital value, without doing any of the shenanigans audio ADCs do to make the result "sound better" than it would without the shenanigans. And psychoacoustics gives a TON of useful tricks to do that! For example, noise shaping is extremely common: it uses filtering techniques to move the noise caused by the entire frontend to frequencies where humans perceive it less (where the equal-loudness contour is highest)." The chip used in the E1DA is the following: |
| JeremyC:
--- Quote from: loop123 on April 03, 2024, 10:51:53 pm ---Someone told me "Audio ADC's just aren't well suited to voltage signal measurements.". How true is it? --- End quote --- It's not possible to make measurements with sub uV (micro volt) accuracy in average room environment, even in majority of university labs. You're talking about using 8 bit scope to measuring 100dB dynamic range , and on the other hand you are providing equations about noise level in nV/sqrt... come on! |
| loop123:
--- Quote from: JeremyC on April 03, 2024, 11:18:56 pm --- --- Quote from: loop123 on April 03, 2024, 10:51:53 pm ---Someone told me "Audio ADC's just aren't well suited to voltage signal measurements.". How true is it? --- End quote --- It's not possible to make measurements with sub uV (micro volt) accuracy in average room environment, even in majority of university labs. You're talking about using 8 bit scope to measuring 100dB dynamic range , and on the other hand you are providing equations about noise level in nV/sqrt... come on! --- End quote --- im only familiar with analog noises. i dont know how to relate ADC bits to dynamic range to nV/Sqrt. any definite equations that can convert one to another? I need to build a Faraday Cage bench size. Im building a lab. |
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