THD+N measurement with AES17-2015 notch filter

Re: THD+N measurement with AES17-2015 notch filter

Postby RJA4000 » Mon Jul 25, 2022 3:53 pm

Thanks for your answer !

Of course !
I should have thought that the accuracy of the substraction method would be problematic.
Thanks for sharing the bandwidth used for HD computing: I'll adapt and use the same.

A lot of (other) work this week, but I hope to work on this during next week-end.
More to come then.

Thanks again !
RJA4000
 
Posts: 58
Joined: Sun Jul 28, 2019 2:28 am

Re: THD+N measurement with AES17-2015 notch filter

Postby RJA4000 » Sun Jul 31, 2022 9:22 pm

Thanks once again !

It works, of course.

I'm now consistently getting the exact same figure than REW with "AES17-2015 standard notch" distortion setting.
I also get exactly the same THD by computing from Band Energy than the "official" THD DDP.

2022-07-31 15_18_48-Greenshot.png
2022-07-31 15_18_48-Greenshot.png (168.71 KiB) Viewed 107 times

2022-07-31 15_20_02-Greenshot.png
2022-07-31 15_20_02-Greenshot.png (253.57 KiB) Viewed 107 times


Of course, there is anoise benefit to this Notch
It is quite constant with level
Chart_00007_20220731_1507.png
Chart_00007_20220731_1507.png (143.17 KiB) Viewed 107 times
RJA4000
 
Posts: 58
Joined: Sun Jul 28, 2019 2:28 am

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