## A System is to a Signal as...

Started by in comp.dsp10 years ago 18 replies

I want to say "a system is to a signal as a function is to a variable". Indeed, I'm pretty sure that when you've gotten fully spun off into...

I want to say "a system is to a signal as a function is to a variable". Indeed, I'm pretty sure that when you've gotten fully spun off into Hilbert spaces and other esoteric stuff (which I can't say that I fully understand), the above statement is pretty close if not entirely true. But before I go and say it publicly in a seminar, I want to pass it by you sharks (uh, folks) and see if ...

## Hilbert Transformer

Started by in comp.dsp9 years ago 4 replies

Hi all,=20 I am a new member. Could you help me to answer the question that is: the fu= nction "remezord" in Matlab uses what formula to...

Hi all,=20 I am a new member. Could you help me to answer the question that is: the fu= nction "remezord" in Matlab uses what formula to estimate the order of filt= ers and why the function can not be used to estimate the order of Hilber tr= ansformer and FIR differentiator? Thank you so much,

## Demodulation with Hilberttransformation

Started by in comp.dsp8 years ago 10 replies

Hello, Using " highpass | rectify | lowpass | downsample" for ages to demodulate signald, I've just found that demodulation using...

Hello, Using " highpass | rectify | lowpass | downsample" for ages to demodulate signald, I've just found that demodulation using Hilberttransformation seems to be very easy (speaking matlab/octave): function y=demodulate( x ) y=sqrt(x.^2 + real(hilbert(x)).^2); endfunction (I implemented "hilbet" myself, using fft) That's the "how", easy ;) But I do not understand the "why". I u...

## Hilbert transformation using real valued input FFT

Started by in comp.dsp8 years ago 4 replies

Hello, I would like to use the hilbert transformation to get an amplitude envelope of a real valued (=measured) signal. Wikipedia describes it...

Hello, I would like to use the hilbert transformation to get an amplitude envelope of a real valued (=measured) signal. Wikipedia describes it nicely: https://en.wikipedia.org/wiki/Analytic_signal#Applications I implemented my tests in matlab/octave and it's easy: \n Hilbert transformation of x \n Shifts the signal by pi # function H=hilbert(x) N=length(x); X = fft(x);