Yes, there are lots of interesting things that can be done with
frequency shifting. Feedback suppression in a PA system by frequency
shifting was suggested by Manfred Schroeder a long time ago. I have
occasionally found it to be useful to broaden a mono signal by feeding
it through a hilbert transf
A nice thing are the endless phase shifts, if you feed back a frequency
shifter. It’s like a Shepard tone.
If you have Logic Pro or MainStage, try the RingShifter, it can do such tricks.
It has 2x6 Allpass filters for the constant phase shift and a quadrature
oscillator with FM and a delay.
S
You can use the phase directly as a sawtooth oscillator. It sounds like a weird
tracking oscillator from back in the days, but it’s surprising, how musical the
artefacts are.
Steffan
> On 07.02.2017|KW6, at 17:34, robert bristow-johnson
> wrote:
>
> using this Hilbert, analytic signal thin
On 02/07/2017 07:49 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?
Now that I think about it, another application might be in stereo
imagi
This course is great, it will give you a really solid, ground up DSP
foundation:
https://www.coursera.org/learn/dsp
This one is also very good if you don't mind learning (or already know)
Python:
https://www.coursera.org/learn/audio-signal-processing
Martin
On 07/02/17 15:10, Roshan Wijetu
�
using this Hilbert, analytic signal thing for frequency detection works only
for pure sinusoids (that are amplitude-modulated and/or frequency-modulated).
�it's really unpredictable (i may be wrong, someone might have math that
predicts) what the instantaneous phase coming out
of this is fo
Hi everyone,
Firstly, thank you all for the stimulating discussion on this forum. I have
a career advice question for which I would value your input.
My background is mechanical engineering (my PhD was in modelling and
control of engines), I've freelanced for years simulating dynamic systems
and
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?
Now that I think about it, another application might be in stereo imaging.
Start with a mono signal, generate the H
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 frequency and amplitude, some rough
estimate of the normally obtained accuracy (can you send a CD signal through the DSP
stuff, invert back to audio samples
can you use this for pitch detection?
convert to phase and use it's derivative for instantanous frequency?
this and a lowpass on the magnitude as has been discussed should make
a combined pitch and amplitude tracker, no?
or do you run into the same problem as had been discussed with the
magnitu
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