Goertzel Algorithm using undersampling ?

Started by MariuszR in comp.dsp5 years ago 2 replies

Hi guys, I have recently read an great article about Goertzel Algorithm...

Hi guys, I have recently read an great article about Goertzel Algorithm at https://courses.cs.washington.edu/courses/cse466/12au/calendar/Goertzel-EETimes.pdf I thought you could help me a bit now. I'm building laser rangefinder which use FFT to calculate distance. Firstly I thought I need to implement FFT in code and then look for highest bin in the spectrum to calculate it's phase ( will hav...


undersampling and FFTW

Started by bastide in comp.dsp12 years ago 3 replies

Hello, I have a problem with my fftw complex transform (1d) when I want to undersample my signal. I start with initial signal (Dimension...

Hello, I have a problem with my fftw complex transform (1d) when I want to undersample my signal. I start with initial signal (Dimension 16384points), and get the FFT of this signal in complex with fftw_plan_dft_1d (result is a 16384points dimension too). This signal has 128 first non-zero values and last 128 points non zero values. Between, all is close to 0 (10e-15). I want to undersa...


expected spectrum of aliased BW limited white noise

Started by nombwa in comp.dsp12 years ago 1 reply

I'm fairly new to DSP and am trying to see the effect of undersampling on bandwidth limited white noise in Simulink. I took the bandwidth...

I'm fairly new to DSP and am trying to see the effect of undersampling on bandwidth limited white noise in Simulink. I took the bandwidth limited white noise source (set the BW to 1kHz), put it through a zero order hold with Sampling rate set to initally 5kHz and the output of this is connected to the FFT spectrum scope block (I buffer 2048 points and take a FFT of the same length). When I...


Re: Undersampling of a clean carrier

Started by Paul Solomon in comp.dsp14 years ago 2 replies

"Paul Solomon" wrote in message news:431e07ae$1@dnews.tpgi.com.au... > > "Thomas Magma" wrote in message > ...

"Paul Solomon" wrote in message news:431e07ae$1@dnews.tpgi.com.au... > > "Thomas Magma" wrote in message > news:dXiTe.402841$5V4.32336@pd7tw3no... > > > > "Paul Solomon" wrote in message > > news:4316590d@dnews.tpgi.com.au... > > > Hi, > > > > > > I have just been doing some test and I noticed a concerning problem that