FFT is an acronym for Fast Fourier Transform. Use this tag for FFT-related questions. Try to also select a specific chip or software tag when possible.
-2
votes
0answers
31 views
Audio Filtering
I have some doubts about how to implement a solution for the app that I explain below:
I want to filter specific audio sounds (truck, trumpet...) with an arduino and a microphone (amplifier + ...
2
votes
2answers
81 views
Doing FFT of electroencephalogram signal at 200Hz - what window size to use?
I got a brainwave EEG(ElectroEncephaloGram) sensor that is continuously sending data over to my program at about 200 data points per second. Can someone suggest what window/bin size I should be using ...
4
votes
3answers
143 views
What are the origins of the window functions in DSP? Why not just use a rectangular window?
As far as I know, in DSP we wish to remove or reduce the effect of some undesired signals by separating its frequency spectrum from the spectrum of the whole signal (our main signal and the noise). ...
2
votes
4answers
188 views
Microcontroller suggestion
Im designing an analog audio amp with a 6 band analog equalizer controlled via a 7" LCD touch screen. Im wanting to preform a real time 2048 point FFT and display it on the screen in some kind of ...
0
votes
0answers
40 views
Calculating frequencies from FFT data
I have a csv file with FFT data obtained from an oscilloscope which read as follows:
Memory Length 250
Trigger Level 0.00E+00
Source FFT
Vertical Units dB
Vertical Scale 2.00E+01
...
2
votes
2answers
77 views
Does it make sense to plot the angle in an signal spectrum analyzer?
I've built a toy oscilloscope with an Arduino, acquiring the samples with the ADC and plotting the spectrum on my computer. The spectrum is the output of the FFT algorithm. You can see a video here of ...
3
votes
3answers
300 views
How to get fundamental frequency of a signal using autocorrelation?
I am trying to get the fundamental frequency of a signal that only has a single pitch. I coded out the autocorrelation function using FFT and already got the autocorrelation result. Unfortunately, I ...
3
votes
2answers
565 views
Accelerometer data smoothing filtering pothole detection
I wanted to start a separate thread concentrating on smoothing filtering and detecting bumps and potholes with an Arduino and my Accelerometer. I'm using an Analog Accelerometer set to 50HZ bandwidth ...
1
vote
1answer
115 views
Arduino logging vertical acceleration data
I'm doing a project where I want to start and stop recording of accelerometer data set up to measure the vertical acceleration Z axis of a car's suspension movement when it hits a pothole. I want to ...
4
votes
1answer
120 views
Sampling frequency required to detect peaks
I am processing a signal in the digital domain and I have to detect "peaks" in it, e.g. by finding local maxima formed by three consecutive values. (More sophisticated criteria could be used like ...
0
votes
0answers
139 views
Pseudorandom sequence Matlab [closed]
I am trying to develop a dsss (direct sequence spread spectrum) model on MATLAB, more precise i want to build code for BOC (binary offset carrier) modulation,used in GPS.
The problem that i am facing ...
5
votes
2answers
882 views
Using FFT for spectral analysis: How to convert from power to dBm?
I have the output of my FFT, an array of complex numbers, and each one has been computed to the magnitude squared. To my understanding, the magnitude squared is equivalent to the power, so in order to ...
2
votes
2answers
706 views
How can I find a specific frequency after doing FFT?
I have some samples from an SDR that I run through FFT and I want to detect the presence of a specific signal, exactly 148.369MHz.
The maximum sample rate of the device is 2Mhz, this is just ...
0
votes
0answers
65 views
what should the amplitude be when plotting 1-sided Amplitude Spectrum?
I have a continuous signal x(t) such that
\$ x(t)=12 \cdot cos(6\pi t)+6 \cdot cos(24 \pi t)+3 \cdot cos(30 \pi t) \$
and is asked to sketch a 1-sided Amplitude Spectrum of the signal x(t) if ...
1
vote
1answer
178 views
System Generator:How to know how many clock cicles are nedeed for my FFT block?
I would like to know how many clocks cycles the FFTv4_1 require?
Does anyone know how to determine the required clock cycles? I am using the System Generator 9.2i version.
Thank you so much!
