Original Message
Subject: Re: [music-dsp] Dynamic smoothing algorithm
From: "Lubomir I. Ivanov"
Date: Wed, December 7, 2016 5:13 pm
To: "A discussion list for music-related DSP"
-
hello,
On 6 December 2016 at 08:26, Andrew Simper wrote:
> Hi Guys,
>
> Another year has almost passed so I thought it was time to release
> another technical paper!
>
> It's a dynamic smoothing algorithm that can do things like this:
>
> http://cytomic.com/files/dsp/dynamic-smoothing.png
>
> I c
> On 7 Dec 2016, at 13:10 , Uli Brueggemann wrote:
>
> Hi,
>
> I'm searching a solution for an allpass filter calculation with following
> conditions:
>
> There is a given pulse response p with a transfer function H. It is possible
> to derive a linear phase pulse response lp from the magnit
>
> *The magnitude of ap = 1, so ap applies only phase shifts. Its group delay
> is inverse to the group delay of p.*
>
I think the idea here is to derive a filter with the same magnitude
characteristics as p, but zero group delay --- so as to transform arbitrary
filters into zero-phase / zero-del
I'm not sure I quite follow what the goal is here? If you already have lp
and p, then there aren't any additional calculations needed to obtain ap -
it's an IIR filter with numerator coefficients given by lp, and denominator
coefficients given by p. The pulse response is obtained by running the
fil
A linear phase all-pass filter is a delay.
Stefan
On Dec 7, 2016 4:30 AM, "STEFFAN DIEDRICHSEN" wrote:
>
> On 07.12.2016|KW49, at 13:10, Uli Brueggemann
> wrote:
>
> Is there a solution to elegantly calculate the pulse response ap ? The
> calculation of p^-1 may be difficult or numerically uns
> On 07.12.2016|KW49, at 13:10, Uli Brueggemann
> wrote:
>
> Is there a solution to elegantly calculate the pulse response ap ? The
> calculation of p^-1 may be difficult or numerically unstable.
A spectral inversion can be a challenging at times. However, lp/p should be
fine to calculate,
sounds like a good candidate for Wiener deconvolution:
https://en.wikipedia.org/wiki/Wiener_deconvolution
On 07/12/16 13:10, Uli Brueggemann wrote:
Hi,
I'm searching a solution for an allpass filter calculation with
following conditions:
There is a given pulse response p with a transfer fun
Hi,
I'm searching a solution for an allpass filter calculation with following
conditions:
There is a given pulse response p with a transfer function H. It is
possible to derive a linear phase pulse response lp from the magnitude of H.
Now there is an equation
p * ap = lp (* = convolution, ap =
