# All Questions

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### Extending a waveform

Apologies if this makes no sense or seems rather simple, I'm a Matlab newbie. Basically, I've got a .wav audio waveform which I am resampling to various different frequencies and then trimming the ...
8 views

### downsampling an fft signal

I am currently working with a set of wavelet transforms that I came across in a paper. The paper suggests that I first apply the FFT on the source image and then perform the downsampling. So it says ...
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### Bandwidth of an energy signal

I'm studying for my midterm , and I'm struggling with finding bandwidths. I have this energy spectral density : $\Psi(f)= { 1 \over \sqrt { 1 + ({f \over B }) ^2} }$ , and I need to find the ...
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### MATLAB MIRtoolbox - mirtempo function

I just want to know how functions like mirtempo(), which returns a mirscalar object to a direct format that MATLAB can ...
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Is there a method to find the relative direction of a Bluetooth device to the receiver? A quick Google search on "Bluetooth positioning" returns several methods using triangulation, but I don't want ...
28 views

### Noise in Digital image

in Digital Image Processing restoration ,from my understanding after reading articles , it's seems that the noise must be dominant in the histogram of the image , which is make it possible , to get ...
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### problem in getting rank of matrix correctly

I have a equation to implement which result into the square matrix of orthogonal columns but non independent columns. The rank of this matrix does not seem to be correct. Can anyone help me? The ...
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### state space formulation of a sinusoidal system

Let $f=A\sin{\omega t}=x_1$ and $\dot{f}=-A\omega\cos{\omega t}=\dot{x}_1=x_2$. Let the output be $y=cA\omega$, where $c=1$ is a constant. I want to represent this in a state space formulation: ...
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### Merging pattern for FFT solutions

I have the generic problem of analysing a discretly sampled signal, lets say at 100Hz, and would like to compute features (ML application) of this signal at different scales: An instantiation of this ...
15 views

### Estimating signal strength from PCM-encoded signal

I am processing rtl_fm output (in time domain), extracting Manchester encoded bits. I can detect preamble and, therefore, decode the message which follows the preamble. This is how my signal looks ...
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### Calculating covariance in matching for KLT alorithm

Just would like to check out if there is any reference to the calculation of covariance for KLT image matching between two images THanks
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### Relationship between Carrier Frequency Offset and the Constellation Diagram

As part of a project I am doing, I have to investigate how having a carrier frequency offset would affect the constellation pattern of the received signal.This question has got me baffled because to ...
6 views

### Minimal DSP for video transcoding

I am new to DSP, even more - i am not even in DSP theme at the moment. But i need to understand the possibilities before starting. Problem is - i need to transcode video from 12mbps MPEG2 to any other ...
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### calculating frequency spectrum using fft for video

How to process video with DFT/FFT - getting the frequency using PCO camera in c#,and how to interlink video frames with frequency transform.
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### Could the X-Y resolution for a stereo camera setup be better than that of either of the cameras alone?

My understanding is that it shouldn't be different than the resolution of a single camera, since the actual X and Y coordinates of a point in space are defined from the point's image up to a scalar ...
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### BCI project using EEG signals

I want to make a BCI project, based on EEG signals, to control a robot using the brain's P300 wave. I have read a lot of papers, which give me a wide knowledge on how to deal with those signals, but ...
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### Sound quality with really high sampling rate, but really low bit depth with dithering?

This question is probably more for fun and theory, but how will the sound quality be, if you create a sound with really high sampling rate (like 192kHz) and really low bit depth (e.g. 3bit)? Can you ...
26 views

### Polygon Segmentation technique

I am working on Automated GUI components Segmentation problem. My Images are very simple as it has GUI components such as Buttons, text box and other polygons as you can see in the diagram (a). ...
36 views

### Given two waves, 441 Hz and 700 Hz, how many samples long is each wave's period if the sample-rate is 48 kHz?

The title says it all. I have two waves, Master and Slave. Master is at 441 Hz and Slave at 700 Hz. The sample-rate is 48 kHz. I want to know how to calculate the period of each wave in terms of ...
32 views

### What are the frequency components of a sampled signal after low-pass filtering?

A continuous signal $x_a(t)$ is a linear combination of sinusoids of frequency 250 Hz, 450 Hz, 1 kHz, 2.75 kHz and 4.05 kHz. The signal $x_a(t)$ is sampled at $f_s=$1.5 kHz, and the resulting digital ...
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### What equation describes black alpha on a white image?

What equation best describes the alpha content of a black colored pixel applied to a white pixel when measuring the resulting pixel intensity? For instance given a white pixel: argb : 255, 255, ...
26 views

### Hanning Window Formula - Matlab didnt work

Im trying to do the Hanning Window manually but didnt work, what Im doing wrong? t=[0:.1:10]; x=.5-.5*cos(2*pi*t/102); plot(x); Not sure why I cant obtain the ...
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### 0 accuracy on test data with 24 MFCCs

I have designed a classifier for "bols"(strokes) of the tabla, using the MFCC coefficients 2-13 (ignoring the first coefficient.) at the onsets. When I do a cross validation, I get approximately 46% ...
11 views

### how could i fill missing data?

i tried a forecasting method and i want to check if it is correct or not and why? my study is about evaluating mutual funds for two kind of them it is a comparative study and i wan to use gcc index ...
14 views

### Best segmentation method

This is part of my samples ...
22 views

### What's $\omega _n$ difference between Matlab and Mathematica?

I want to plot this Butterworth filter's TransferFunction: ...
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### Symmetry of Walsh matrix

Walsh matrix is abtained by sorting the rows of Hadamard matrix by number of sign changes (1st row had 0 changes, 2nd has 1 change of sign etc). Walsh matrix is symmetric. Meaning the sorting the ...