I have been trying to find a high performance low cost analyzer for a while now.
Most are either too expensive, or lack the performance level I like to have. Audio Precision has exactly what I want. But it is way too expensive. There are also a few threads that offer DIY solutions. They lack the performance while being too expensive, they seem to be promoting commercial products. My budget is under $500. I wonder whether I can build the device myself. Clearly, repeating the same designs with the same ICs will get me no where. So, I am thinking to develop my own ADC and DAC. I know it is a difficult task. But everything is impossible until somebody does it. Any advice is much appreciated.
Most are either too expensive, or lack the performance level I like to have. Audio Precision has exactly what I want. But it is way too expensive. There are also a few threads that offer DIY solutions. They lack the performance while being too expensive, they seem to be promoting commercial products. My budget is under $500. I wonder whether I can build the device myself. Clearly, repeating the same designs with the same ICs will get me no where. So, I am thinking to develop my own ADC and DAC. I know it is a difficult task. But everything is impossible until somebody does it. Any advice is much appreciated.
As for me I prefer a decent soundcard plus some software (as was stated in the previous post). Or: Distortion analyzer recommendations?
Will a programmable notch filter in front of the ADC and some post signal processing work.
Has anyone done this?
Has anyone done this?
Can you describe your exact requirements? What THD level etc? Because there are many ways to analyze a spectrum.
You say the AP has exactly what you want, but AP doesn't only use ADC and DAC it also has fairly complex analog signal processing which doesn't come cheap.
Seems to me you could do a lot worse than starting out with Frex's ADC but then a lot of your budget is eaten at the start.
SAR ADC for high performance audio ADC project [LTC2380-24]
Seems to me you could do a lot worse than starting out with Frex's ADC but then a lot of your budget is eaten at the start.
SAR ADC for high performance audio ADC project [LTC2380-24]
@ Zung,
I will read the thread thanks,
@ Vovk Z
Ideally, I like to be able to measure THD < 150 dBFS for frequencies up to 20 KHz.
I am familar with a few ways to do so. Currently, I use a notch filter.
But it has issues and it is too cumbersome to use for the frequency range.
@ Abraxalito
You are right. I am familiar with how they do it.
SAR ADCs are very noisy. You can somewhat reduce the noise by averaging. But then
You will see spurrs.
I will read the thread thanks,
@ Vovk Z
Ideally, I like to be able to measure THD < 150 dBFS for frequencies up to 20 KHz.
I am familar with a few ways to do so. Currently, I use a notch filter.
But it has issues and it is too cumbersome to use for the frequency range.
@ Abraxalito
You are right. I am familiar with how they do it.
SAR ADCs are very noisy. You can somewhat reduce the noise by averaging. But then
You will see spurrs.
Unfortunately I don't sure if there is an "industrial standard" how to cheap measure such an ultra-low distortions (if only not active notch-filter crossover). And I'm not very in this "ultra-low" (<150 dBFS) area (I asked you about requirements just to make things clear to others more experienced people).
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Another possible option was reported on ASR a while back. E1DA Cosmos ADC.
It's here with a teardown:
https://www.audiosciencereview.com/forum/index.php?threads/e1da-cosmos-adc-teardown.27967/
It's here with a teardown:
https://www.audiosciencereview.com/forum/index.php?threads/e1da-cosmos-adc-teardown.27967/