Top new questions this week:
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I have a noisy signal around $15\text{s}$ long sampled a $32\,\text{Hz}$. I am trying to estimate the peak frequency or period for a low frequency component with expected frequency in between $0.08\,\…
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I am working with PWM signals. These signals are generated by comparing a modulating (at frequency $f_m$), and a carrier (at frequency $f_c$), as shown in the following image: In the resulting …
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How do I prove or disprove: Smoothing an image with a 3×3 filter using full convolution and then downsampling an image by 2 produces the same result as downsampling an image by 2 and then applying …
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The cross-correlation between two signals can be calculated using $\texttt{IFFT}\left(\texttt{FFT}(a) \cdot \overline{\texttt{FFT}(b)}\right)$ for two binary signals $a$ and $b$. How could one speed …
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The sound of the piano is something very complex. There are various elements to consider such as action, hammer, soundboard, sympathetic resonance, tuning age and even room reverb. Some companies (…
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I’m working on an audio plugin which splits audio into frequency bands for individual processing. The filters must have zero latency, so no linear phase filters. I would like to have perfect …
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I am using PyWavelet to do continous wavelet transform of a 1D signal. The pywavelet continous wavelet transform function works with this line of code: …
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Greatest hits from previous weeks:
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This has been one of the holes in my cheddar cheese block of understanding DSP, so what is the physical interpretation of having a negative frequency? If you have a physical tone at some frequency …
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If I have a signal that is time limited, say a sinusoid that only lasts for $T$ seconds, and I take the FFT of that signal, I see the frequency response. In the example this would be a spike at the …
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I want to use a low pass Butterworth filter on my data but on applying the filter I don’t get the intended signal. Here is the dummy code: Signal A: …
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I’m learning DSP slowly and trying to wrap my head around some terminology: Question 1: Suppose I have the following filter difference equation: $$y[n] = 2 x[n] + 4 x[n-2] + 6 x[n-3] + 8 x[n-4]$$ …
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Adaptive thresholding has been discussed in a few questions earlier: Adaptive Thresholding for liver segmentation using Matlab What are the best algorithms for document image thresholding in this …
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I wanted to generate Gray Scale wedge image of 10 Levels in MATLAB and then increase and decrease its Intensity. By high intensity, I mean mapping increasing the level of gray scale intensity in an …
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I have read many articles about DTFT and DFT but am not able to discern the difference between the two except for a few visible things like DTFT goes till infinity while DFT is only till N-1. Can …
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Can you answer these questions?
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I’m trying to figure out what length of linear sine sweep I need to cover 100Hz to 9KHz at 1Hz frequency resolution. The max sweep length of my software is 160s, so for this bandwidth it sweeps 55….
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I am trying to write audio and image filtering together code in my project. Purpose: The main aim of this project is to combine audio with image filters; like for example passing low frequencies of an …
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Suppose we are studying a dynamic system believed to be well modeled via $$ x” + \frac bm x’ + \frac cm x = \frac Fm$$ $x”$ – acceleration $b$ – damping factor $c$ – spring rate $F$ – external force….
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