Psophometrisch filter ADAU1701
Any info on how to setup a Psophometrisch filter in sigmastudio for ADAU1701 per ITU-T O.41 ?
I searched for it but no usefull results, looked at schematics from old test equipment but either the filter is a black box or unreadable schematics, AI is not very helpfull either, only vague answers.
Final purpose is a SINAD meter, the DSP would be a bandpass filter, psopho filter, 1khz notch filter and level detection before and after the filter, data goes to an ESP32 for the user interface part, hardware is completed...now the filter part, i know i could do most of it in the ESP32 alone but i had a few DSP modules from projects that were halted, at the input is an AGC stage to provide the DSP with a nice steady level.
Thanks.
hardware
processors and dsp
Processors and Microcontrollers
adau1701
Hello JayEsp,
You mentioned some filters that I am not aware of. So this will take some work on my part. Perhaps someone else on the forum might chime in? Otherwise, send me a PM and a Friend Request and we can communicate offline for now.
FYI, I will be out of town at a trade show for the rest of the week and through the weekend.
Dave T
ok, i got something working, 3 cascaded IIR filter blocks, the curve is close to what it has to be
also did a C-message curve, very similar
this is the psophometric setting
and a comparison of C-message (red) and psophometric or CCITT
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