signal-processing Questions
2
I'm just doing a power spectral density analysis of a signal in time domain. I'm following the fft method described in :
http://www.mathworks.com/support/tech-notes/1700/1702.html
It gives the re...
Apologetics asked 6/3, 2013 at 18:54
2
Solved
Is there an existing implementation in Python for detecting steps in one dimensional data?
E.g. something that detects one step in this data:
There are quite a few descriptions of algorithms ou...
Mirianmirielle asked 28/12, 2017 at 1:47
7
Solved
I have generated three identical waves with a phase shift in each. For example:
t = 1:10800; % generate time vector
fs = 1; % sampling frequency (seconds)
A = 2; % amplitude
P = 1000; % period (se...
Timid asked 18/12, 2014 at 11:9
7
Solved
I am trying to resample a signal (sound sample) from one sampling rate, to a higher sampling rate.
Unfortunately it needs some kind of filter, as some 'aliasing' appears to occur, and I'm not famil...
Spermaceti asked 8/12, 2010 at 23:53
7
Solved
I'm working on implementing an FFT algorithm in assembly on an 8-bit microcontroller (HCS08) for fun. Once the algorithm is completed, I'll have an array of 8-bit real/imaginary pairs, and I'll wan...
Counterirritant asked 3/4, 2011 at 5:30
6
Solved
I have quite a noisy data, and I am trying to work out a high and low envelope to the signal. It is kind of like this example in MATLAB in "Extracting Peak Envelope".
Is there a similar f...
Intro asked 12/12, 2015 at 2:22
8
Solved
Let's say you had to calculate the sine (cosine or tangent - whatever) where the domain is between 0.01 and 360.01. (using C#)
What would be more performant?
Using Math.Sin
Using a lookup array ...
Organza asked 5/9, 2009 at 2:57
1
I am comparing FFT vs. CWT for a specific signal.
It is not clear to me how to read of the respective frequencies and amplitudes from the corresponding scaleogram of the CWT. Furthermore, I have ...
Pitchy asked 27/2, 2019 at 15:41
3
Solved
I am new to digital signal processing. I have the following sensor sample data
Time(milliseconds) data
------------------ -------------------
0 0.30865225195884705
60 0.14355185627937317
100 -0....
Sartorial asked 7/12, 2015 at 12:34
4
Solved
I've got a 1-D signal in which I'm trying to find the peaks. I'm looking to find them perfectly.
I'm currently doing:
import scipy.signal as signal
peaks = signal.find_peaks_cwt(data, np.arange(1...
Countrified asked 29/8, 2014 at 15:16
2
I have 20 signals (time-courses) in group A and 20 signals in group B. I want to find a measure to show that group A is different from group B. For example, I ran xcorr for the signals within each ...
Delftware asked 17/12, 2013 at 21:2
3
I'm looking for how to draw the sound waves according to music.
I want waves like this image
here is some discussion about displaying Waves from music
WaveForm on IOS
rendering a waveform on ...
East asked 31/10, 2013 at 6:28
3
Solved
Gaussian smoothing is a common image processing function, and for an introduction of Gaussian filtering, please refer to here. As we can see, one parameter: standard derivation will determine the s...
Coppinger asked 23/4, 2013 at 9:24
2
Solved
Disclaimer: I am probably not as good at DSP as I should be and therefore have more issues than I should have getting this code to work.
I need to filter incoming signals as they happen. I tried to...
Assiut asked 8/11, 2016 at 9:41
3
z transform is very important in signal process. I can find fourier, laplace, cosine transform and so on in sympy tutorial. But I do not know how to do z transform using sympy. Could you tell me ho...
Campos asked 6/4, 2017 at 6:35
3
Solved
When using librosa.stft() to calculate a spectrogram, how does one get back the associated frequency values? I am not interested in generating an image as in librosa.display.specshow, but rather I ...
Rocker asked 11/8, 2020 at 2:1
6
Solved
With the,
Sampling Freq: 10kHz
Cut-off Freq: 1kHz
How do I actually calculate the coefficients for the difference equation below?
I know the difference equation will be in this form, but do not...
Aldin asked 4/1, 2014 at 18:22
3
Solved
I have two audio recordings of a same signal by 2 different microphones (for example, in a WAV format), but one of them is recorded with delay, for example, several seconds.
It's easy to identify ...
Platto asked 11/2, 2011 at 9:33
4
Solved
i've this photo :
and i'm trying to make Document binarization using niblack algorithm
i've implemented the simple Niblack algorithm
T = mean + K* standardDiviation
and that was it's result:
...
Betrothal asked 18/4, 2012 at 9:20
2
A lot of articles are using CNNs to extract audio features. The input data is a spectrogram with two dimensions, time and frequency.
When creating an audio spectrogram, you need to specify the exa...
Diamagnet asked 5/5, 2016 at 7:40
3
Solved
I'm working with the librosa library, and
I would like to know what information is returned by the librosa.load function when I read a audio (.wav) file.
Is it the instantaneous sound pressure in p...
Lime asked 24/5, 2020 at 13:12
3
I am confused about the terminology used in scipy.signal.periodogram, namely:
scaling : { 'density', 'spectrum' }, optional
Selects between computing the power spectral density ('density')
where...
Supranational asked 11/3, 2014 at 22:54
1
I'm trying to use the BaselineRemoval package to remove background fluorescence from some Raman spectra. In the code documentation, it states the preferred format for the input as input_array: A pa...
Upshot asked 28/8, 2020 at 12:46
1
Solved
I'm using the librosa library to get and filter spectrograms from audio data.
I mostly understand the math behind generating a spectrogram:
Get signal
window signal
for each window compute Fourier...
Notch asked 10/8, 2020 at 21:2
2
Solved
I am slowly working on a project which where it would be very useful if the computer could find where in an mp3 file a certain sample occurs. I would restrict this problem to meaning a fairly exact...
Joyless asked 22/6, 2020 at 22:39
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