�
okay, Benny, i am changing your "a(t)" to "x(t)", because i have been using
"a(t)" for the crossfade gain function.
now if you want to splice from� x(t) to x(t+T) when T is "estimated", does that
mean you can add or subtract a couple
of milliseconds to T for the purpose of minimizing the glitch that may result
in the splice?� i might recommending doing that.
so that, given an initial T, what i might recommend doing is evaluating the
cross-correlation between x(t) and x(t+T+tau)
� �<x(t), x(t+T+tau)>� = integral{�x(t) x(t+T+tau)� dt}
where tau is a variable, either positive or negative and no larger than 5 or 10
milliseconds, that offsets T a little.� look for the value of tau that makes
the cross-correlation maximum and adjust T
with that value.
then crossfade.� whether it's an equal-voltage or equal-power crossfade is
something that the little "theory of optimal splicing" post is about.� someone
brought up this 2016 DAFx paper by�Marco Fink, Martin Holters, Udo Z�lzer that
appears to be
about the same topic.� i hadn't known about this before so i am gonna be
reading through it.� it already appears that they have an equation that is
common with one from my post on music-dsp longer ago.� (i sorta wish they made
a reference to it, but i am not sore about
it.)
L8r,
r b-j
---------------------------- Original Message ----------------------------
Subject: Re: [music-dsp] Blend two audio
From: "Benny Alexandar" <ben.a...@outlook.com>
Date: Wed, June 20, 2018 1:11 pm
To: "Nigel Redmon" <earle...@earlevel.com>
"music-dsp@music.columbia.edu" <music-dsp@music.columbia.edu>
--------------------------------------------------------------------------
> Hi Nigel,
>
> The delay will be estimated one time in the beginning and it remains
> constant. After that the audio which is ahead is buffered for that much.
> When switching it has to align so that after switching to other audio, it
> should be glitch free and seamless meaning user should not notice the
> switching.
>
> For eg: two same audio sources one x(t) and other x(t + T) where T is the
> delay between the two audio.
>
> -ben
> ________________________________
>
From: music-dsp-boun...@music.columbia.edu
<music-dsp-boun...@music.columbia.edu> on behalf of Nigel Redmon
<earle...@earlevel.com>
> Sent: Tuesday, June 19, 2018 4:44 AM
> To: music-dsp@music.columbia.edu
> Subject: Re: [music-dsp] Blend two audio
>
> Suggestions of crossfading techniques, but I’m not convinced that
> solves the problem the OP posed:
>
> "given [two] identical audio inputs...A1 is ahead of A2 by t sec, when switch
> from A1 to A2...it should be seamless”
>
> If the definition of “seamless” is glitch-free, crossfading will
> solve it. But then why mention “identical" and “ahead”?
>
> I think he’s talking about synchronization. And it’s unclear
> whether t is known.
>
>
> On Jun 16, 2018, at 10:45 AM, Benny Alexandar
> <ben.a...@outlook.com<mailto:ben.a...@outlook.com>> wrote:
>
> Hi,
>
> I'm looking for an algorithm to blend two audio. My requirement is
> given tow identical audio inputs say A1 & A2.
> A1 is ahead of A2 by t sec, when switch from A1 to A2
> it should be seamless and vice versa.
>
> -ben
>
> _______________________________________________
> dupswapdrop: music-dsp mailing list
> music-dsp@music.columbia.edu
> https://lists.columbia.edu/mailman/listinfo/music-dsp
�
�
�
--
r b-j� � � � � � � � � � � � �r...@audioimagination.com
"Imagination is more important than knowledge."
�
�
�
�
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