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On 15 Dec 2009 12:46:41 GMT, Philip Pemberton <usenet09@philpem.me.uk
I'm thinking about having a play with a software-based radio, based on a
heavily hacked-up radio and an IF-to-AF down-converter (basically, tap
the IF, downconvert to AF, then...
Started by Philip Pemberton on
, 37 posts
by 13 people.
Answer Snippets (Read the full thread at omgili):
The downside
of all this is that Parseval....
The theory.
Thing is to use the forward FFT algorithm for
both the forward transform and the inverse transform-trip y = ifft(fft(x));
returns the same data as the input (to within numerical
precision).
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On Mon, 16 Mar 2009 06:22:19 -0500, "hq9000" <psy-nn@mail.ru
Hello people,
Standard FFT lets us retrieve amplitudes of evenly distributed
frequencies.
What if I need at some frequency range greater/smaller density of
frequency points...
Let's ...
Started by hq9000 on
, 11 posts
by 6 people.
Answer Snippets (Read the full thread at omgili):
That....
Obvious solution is to calculate FFT on greater piece
resolution in higher frequency range).
Conditions of the FFT it is required that given 1024
sample inputs that you get 1024 Fourier logarithmic
scale for frequency dimension).
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On 09 Feb 2009 21:50:02 GMT, Frédéric Praca <frederic.praca@free.fr
Chers amis du groupe, bonjour
il m'a pris une envie de rendre générique le code suivant trouvé sur le
Net :
with Ada.Numerics.Short_Complex_Types;
use Ada.Numerics.Short_Complex...
Started by Frédéric Praca on
, 7 posts
by 3 people.
Answer Snippets (Read the full thread at omgili):
Package FFT_Pack is
procedure Debug(X : Complex_Vector);
procedure FFT (FFT_Data : in out Complex_Vector ;
Inverse_Transform : in boolean );
end FFT_Pack;
with Ada.Text;
with Ada.Numerics.Generic....
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I'd like to write a simple program(preferably in C#) to which I sing a pitch using a mic and the program identifies to which musical note that pitch corresponds.
Thank you very much for your prompt responses. I clarify:
I'd like a (preferably .NET) library...
Started by Antoni on
, 15 posts
by 15 people.
Answer Snippets (Read the full thread at stackoverflow):
This guy on CodeProject has....
Once you've computed the FFT you identify the fundamental frequency (usually the frequency with the highest amplitude in the FFT to, A or A#?).
Turns a waveform (your sung note) into a frequency distribution .
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I'm a .NET programmer, and I'm developing a system that collects real time production data and stores it in an Oracle database. The data will need to undergo extensive processing: essentially digital signal processing stuff--looking for mins and maxes...
Started by Klay on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
If your Oracle database runs on an operating (if not, I'm sure you could put a thin .Net layer on top of MatLab to create a C DLL), then you can call.
In MatLab rather than trying to build FFT logic in PL/SQL.
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Does anyone know of a .NET programmable/usable API for reading an image file, and comparing it to an existing set of images?
e.g. I have three pictures of the letters A, B, and C. I then copy the picture of A, and modify it so that it is flipped 180 degrees...
Started by 80bower on
, 6 posts
by 6 people.
Answer Snippets (Read the full thread at stackoverflow):
You will probably find lots of libraries for hough transformation or FFT, but I'm.
Are good ways to do this.
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Where can I find a free, very quick, and reliable implementation of FFT in C#? Can be used in a product? or are there any restrictions?
Started by AnnaR on
, 7 posts
by 7 people.
Answer Snippets (Read the full thread at stackoverflow):
Math.NET's Iridium library provides a fast, regularly updated collection of math-related... .
(See ComplexImage.cs-source C# mathematics library with FFT algorithms.
This is a free .Net (open-source) library with Fast Fourier Transform support.
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I used ORCAD Pspice 10.5 for simulation.Now I know that I can get the fourier components of one net in the output file.But I want to get the fourier components of several nets at the same time in the output file.Is there anyway to do this?
Or can I transform...
Answer Snippets (Read the full thread at orcad):
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I'm wondering what is the recommended audio library to use?
I'm attempting to make a small program that will aid in tuning instruments. (Piano, Guitar, etc.). I've read about ALSA & Marsyas audio libraries.
I'm thinking the idea is to sample data from...
Started by MAckerman on
, 6 posts
by 6 people.
Answer Snippets (Read the full thread at stackoverflow):
Marsyas would be a great choice for doing this, it's built for exactly this kind:
MarSystemManager mng; // A series to contain everything MarSystem* net = mng.create("Series", "series"); // Process the data from the SoundFileSource....
In FFT filters.
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I used ORCAD Pspice 10.5 for simulation.Now I know that I can get the fourier components of one net in the output file.But I want to get the fourier components of several nets at the same time in the output file.Is there anyway to do this?
Or can I transform...
Answer Snippets (Read the full thread at orcad):
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