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Looks pretty close to me.
Looks pretty close to me.
It sure looks good!So doing this manually for linearity, and compensating for the level difference in hardware etc. Below is a chart with signal levels sent to the DAC and the levels recorded by the ADC starting at -120 dbFS and going in 2 db steps to -144 dbFS. The column beside it shows the difference in what was recorded vs expected. I used 128 FFT, 4 averages, with Topping D10B feeding RME Babyface Pro FS at 48 khz. Using more or fewer averages and larger FFT sizes causes the values to bounce around a couple tenths either way. Looks awfully good and less bouncing around than what was posted earlier.
View attachment 229657
I promise to practice it!
Roger with the "Level"!
But no matter how much I expand it, "SinAD" doesn't show up...
Nope,we found out ourselfs,thank youSorry, but did I miss something broken yet? Just trying to catch up.
SINAD is just THD+N without the minus sign. I didn't feel it needed its own entry in the results
Yes, I know.
I thought you wanted to have the same values both as a text and as a plottable graph. No need to add if it's designed to be so.
I know you guys figured it out but would you explain it to an ignorant guy like me?Nope,we found out ourselfs,thank you
This is NOT a bug report @pkane . It's rather some kind of inquiry about background information.
So, how is the "No signal" -limit done? Does it affect only to the left channel?
When you have a strong signal on the left channel (and almost no signal at all on the right channel)
View attachment 229708
you can do this:
View attachment 229707
And when you have a strong signal on the right channel (and almost no signal at all on the left channel)
View attachment 229721
you can't do it anymore (At least with my equipment). It won't go past 40 Hz easily, here is the 7th try of the 40 Hz measurement:
View attachment 229709
When the graph is ready, there are only 5 points left and there's a lot of skips on the middle frequencies.
View attachment 229720
Some variable is likely out of range on the left channel between 40 Hz and +10 kHz and it most likely activates the "No sound" error checking.
Could you please explain how the "No sound" process is made and what is the variable and the value that activates it?
Thanks for the explanation!
It does indeed work:
View attachment 229728
View attachment 229729
Does the "No sound" detection wait for the actual complete silence? Or something like "better than -100 or -120 dBFS silence"? If the limit is complete 100% digital silence, then it was something else that prevented my previous "analog left channel middle frequency measurements" which obviously had some amount of background noise and distortion.
At the start of the recording, anything above -120dBFS is considered signal, below that -- silence.
In my case, which I think Sokel has in mind, it is how to do very low level measurements and know what the results really mean. In the spectrum graph of a single tone, the level shown is 6.02 db lower than expected. So at a minimum all I can say is if I adjust for that 6.02 db then the results are at the levels expected vs Full Scale. I more or less confirmed it works and Sokel did a test that appears to confirm it as well. It also agrees with what is shown in the results tabulation if you open it from the square near the upper right corner.I know you guys figured it out but would you explain it to an ignorant guy like me?
Cosmos ADC?