[chuck-users] smoothing and scaling RMS data

[Andrew Telichan Phillips]

Thanks Mario - I appreciate the guidance!

Uff... I see I left a clause dangling in my last sentence there! Oops!

Anyhow, since I posted, I happened to come across the idea of using a one
pole filter to smooth the signal and was able to implement something... and
then later refine the implementation with the help of colleagues who have
more DSP knowledge than I do.

I've got something working fairly well, but will certainly see what this
paper has to offer... I'm sure there's plenty of room for improvement.



сб, 29 февр. 2020 г. в 19:30, Mario Buoninfante <mario.buoninfante at gmail.com
>:

> Hi Andrew,
>
> It seems to me you need an envelope follower.
> You can find more info about a possible implementation here:
> https://www.bbc.co.uk/rd/publications/rdreport_1983_17
>
> It's about dynamic range control (compressor, expander, limiter, gate),
> and all of them use an envelope follower.
> In alternative, you could start from here as well:
> https://chuck.cs.princeton.edu/doc/examples/deep/follower.ck
>
> Cheers,
> Mario
>
> On Tue, 25 Feb 2020 at 02:38, Andrew Telichan Phillips <
> a.telichanphillips at gmail.com> wrote:
>
>> Hello,
>>
>> I'm wanting to capture the amplitude envelope from a live source and
>> generate feedback loops... I'm starting by obtaining RMS values, as per the
>> examples on the home site:
>> https://chuck.cs.princeton.edu/doc/examples/analysis/features/rms.ck
>>
>> First, does anyone have a preferred way of filtering the data that
>> effectively captures transients and smoothes the decay?
>>
>> Second, is there a way to scale the range of this smoothed data - that
>> is, map it onto a defined range to use as a parametric control for another
>> UGen?
>>
>> While I'm at it, does ChucK have a filter for DC leak?
>>
>> I'm new to ChucK and am used to work, so I appreciate any help (and
>> patience).
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