Re: [webaudio] possible error in DRC processing graph

Thanks Paul,

I am not 100% sure about the second graph. Isn't the knee the width around
the threshold? The first graph in my mind looks correct if you just move
the threshold forward to the hard knee so the curves remain the same after
the knee. Otherwise it looks like you are factoring in a boost post
threshold which seems to be the opposite of a compressors purpose. See
slide 10 (ignoring overall boost)
http://c4dm.eecs.qmul.ac.uk/audioengineering/compressors/documents/Reiss-Tutorialondynamicrangecompression.pdf

That being said, don't take my word at face value, I am trying to fix some
of our compression curves and making sure I understand this enough before I
do it.

Curtis

On Mon, Nov 16, 2020 at 3:53 AM Paul Adenot <padenot@mozilla.com> wrote:

> Yes, you're right, I don't know why I did it like that in the first place.
>
> Thanks for the report, I've updated with a new proposed diagram:
> https://github.com/WebAudio/web-audio-api/pull/2277
>
> Paul.
>
> On Mon, Nov 16, 2020 at 6:11 AM Curtis Malainey <cujomalainey@google.com>
> wrote:
>
>> Hello w3
>>
>> I was browsing the DRC web audio spec and I believe there is an error in
>> the graph in section 1.19.4 figure 14. The graph denotes the difference
>> between a hard and soft knee. But shouldn't a hard knee be on the threshold
>> marker? The figure has the threshold marker at the beginning of the soft
>> knee.
>>
>> Curtis
>>
>