Thanks a lot.
If by any chance you happen to find a readable copy , please post it here or PM me, it will be invaluable.
And yes, that dual compression and mid-high boosting is the starting point for my experiments.
Not sure about the final outcome but any advance will certainly improve current situation.
I found the hardcopy (in Dutch). I doubt if it would be of much use to you, but one of the references may be interesting, see the pdf at the bottom of:
http://resolver.tudelft.nl/uuid:200f650e-7756-4230-8d3f-76fa35ff2827
It's the PhD thesis, in English, of Wouter Serdijn, who was then doing a PhD on hearing aid electronics. He is a professor of implantable electronics now.
My ingenieurs-thesis was about implementing the compressors in CMOS using weakly inverted MOSFETs. I chose a set-up where everything is first compressed with an ideally infinite compression ratio, then passed through the filter, then partly expanded again using a control signal obtained from the compressor and processed with some nonlinear circuits.
Advantage: the noise of the integrated filter is suppressed better than in Wouter Serdijn's set-up, disadvantage: the output limiting also responds to signals that are in the filter's stop band.
http://resolver.tudelft.nl/uuid:200f650e-7756-4230-8d3f-76fa35ff2827
It's the PhD thesis, in English, of Wouter Serdijn, who was then doing a PhD on hearing aid electronics. He is a professor of implantable electronics now.
My ingenieurs-thesis was about implementing the compressors in CMOS using weakly inverted MOSFETs. I chose a set-up where everything is first compressed with an ideally infinite compression ratio, then passed through the filter, then partly expanded again using a control signal obtained from the compressor and processed with some nonlinear circuits.
Advantage: the noise of the integrated filter is suppressed better than in Wouter Serdijn's set-up, disadvantage: the output limiting also responds to signals that are in the filter's stop band.
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AVR met oneindige compressie: AGC with infinite compression
niveaudetector: level detector
referentie: reference
regelbaar filter: controllable filter
niet-lineaire bewerking (regelbaar i.v.m. regelbaar kniepunt): non-linear processing, controllable because of controllable knee point
uit: out
CCA: current-controlled anplifier
The non-linear processing entailed a 1/x function at low levels that were not to be compressed, 1/sqrt(x) at higher levels that were to be compressed 2:1 and just a constant at the highest levels, that were to be totally compressed.
niveaudetector: level detector
referentie: reference
regelbaar filter: controllable filter
niet-lineaire bewerking (regelbaar i.v.m. regelbaar kniepunt): non-linear processing, controllable because of controllable knee point
uit: out
CCA: current-controlled anplifier
The non-linear processing entailed a 1/x function at low levels that were not to be compressed, 1/sqrt(x) at higher levels that were to be compressed 2:1 and just a constant at the highest levels, that were to be totally compressed.
Thanks again 🙂
FWIW I had already "decoded" most of the labels, guess having a Polyglot mindset helps, and anyway Google translate can do the heavy lifting 🙂 , nowadays languages are NOT a problem.
In any case, besides text I am interested in graphs and curves and those are "universal".
Will check your suggestions 👍
FWIW I had already "decoded" most of the labels, guess having a Polyglot mindset helps, and anyway Google translate can do the heavy lifting 🙂 , nowadays languages are NOT a problem.
In any case, besides text I am interested in graphs and curves and those are "universal".
Will check your suggestions 👍