> how do you quadrature modulate without Hilbert filters?
>
Perhaps I'm using the wrong term - the operation in question is just the
multiplication of a signal by e^jwn. Or, equivalently, multiplying the real
part by cos(wn) and the imaginary part by sin(wn) - a pair of "quadrature
oscillators."
Original Message
Subject: Re: [music-dsp] � 45� Hilbert transformer using pair of IIR APFs
From: "Ethan Duni"
Date: Thu, February 9, 2017 5:06 pm
To: "A discussion list for music-related DSP"
On Tue, Feb 7, 2017 at 6:49 AM, Ethan Fenn wrote:
> So I guess the general idea with these frequency shifters is something
> like:
>
> pre-filter -> generate Hilbert pair -> multiply by e^iwt -> take the real
> part
>
> Am I getting that right?
>
Exactly, this is a
That jitter, eh? https://en.wikipedia.org/wiki/Kalman_filter
Your algorithm won't work for general pitch sources, become many in the
wild will lack a prominent fundamental frequency. That said, it's pretty
fun and some good creative mischief might be had with it. For example, try
multiplying a
Here is another test with more difficult input
Also works an drums, kind of
https://soundcloud.com/magnetic_winter/adaptive-ap-pitchtrack-2/s-FCoKI
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Am 09.02.2017 um 14:15 schrieb Theo Verelst:
The idea of estimating a single sine wave frequency, amplitude and
phase with a short and easy as possible filter appeals to me though.
Did you listen to the example I posted? Do you think it's useful? Or too
many artefacts?
On 2017-02-07, Theo Verelst wrote:
Like with many transforms, I can't help but practically think that
it's hard to make a tradeoff between the meaning of the results, such
as [...]
Here there's an rather simple optimization criterion: a constant 45
degree phase offset, or perhaps a pair of
Thinking about it, I recall there was some from of transform used for frequency/time
analysis for instance for radar problems (maybe books from before WWII, or more recent
frequency/time analyzers) and without checking though it was in popular DSP speak
something like the Hilbert transform, but
On 2017-02-06, robert bristow-johnson wrote:
[...] and analytic signal
a(t) = x(t) + j y(t)
= g(t) cos(w t) + j g(t) sin(w t)
= g(t) e^(j w t)
the analytic envelope is
|a(t)| = sqrt( x(t)^2 + y(t)^2 )
= g(t)
so that works great for a