# All Questions

12 views

### getting th average pitch of a wave C#

some other said that make my problem too narrow so that they can answer with few paragraphs.. so what i want to do is to separate the component i need in evaluation the pronunciation of the user.. so ...
11 views

### Differences observed on the complex wavelet transform applied on the same signal

I have applied a complex wavelet transform on two signals : a first one a second one that is a concatenation of the first signal and another one For the 4th coefficient (as an example, i've got ...
27 views

### Combining two FIR band-pass filters

I am using IPP for FIR filtering over 1D data. I want to use the same input and filter it using two band pass filters. This is how I do it: ...
8 views

### On application of MFCC for sound classification. How to normalize MFCCs

I have found some explanations on MFCC and specifically on application of DCT. I feel like I am slowly getting to the point but I still find a lot of things that confuse me. Below is the part of the ...
18 views

### Convolution in image processing

Does anyone know how to write arg min code in matlab with explanation? I am referring to a paper for my research. I am not sure whether I can paste the paper link here. At first, I try to do feature ...
5 views

### Subsetting a GeoTIFF Image

I wish to create a subset of a multiband image in OpenCV / Python. The image is in the GeoTiff format. The bands might be 16 bit or 8bit. How do I achieve this using OpenCV and Python.
13 views

### Difference between natural response and forced response?

Reference Second post on EdaBoard.com Time response of a system is the time evolution of the variables. In circuits, this would be the waveforms of voltage and current versus time. ...
20 views

### Signal compare - cross corelation in frequency domain matlab

I need compare two signals. Signals have simliar shapes but completely different values (as on picture): So I think cross corelation in frequency domain should gave me a number that shows me how ...
13 views

### Spectogram using STFT and windowing functions [duplicate]

I am trying to make a spectogram viewer without using spectogram command. For this purpose, I used a sin function. I break up the input signal into 256 segments Multiplied ach egment with the Hamming ...
32 views

### Expression to represent alternating pulse train?

I have a question regarding an alternating pulse train signal, p(t), and a system which looks like this: Immediately, I'm supposed to be able to extrapolate that pt=p1(t)-p1(t-Δ) How do you ...
25 views

### How to generate AWGN with given power spectral density

I am a little unsure about the generation of a additive white Gaussian noise, so I would appreciate to hear from you if I`m doing it correctly. My goal is to generate the time-domain noise ...
45 views

### Spectrogram using STFT

I am trying to make a spectrogram viewer without using the spectrogram command. For this purpose, I used a sin function. I broke up the input signal into 256 segments, multiplied each segment with the ...
41 views

### Minimum Sampling frequency for this signal to avoid aliasing

I would like to compute the minimum sampling frequency for the signal $x(t)$ given below: $x(t)= sinc ^3(300t) * sinc ^5(600t)$ and $*$ stands for convolution. where the sinc function is defined ...
50 views

### recognizing frames as voiced/unvoiced/silenced

i have to implement a function in matlab,for labeling silenced,voiced and unvoiced frames in signal. I mean i want to specify each frame as a voiced or unvoiced or silenced frame by using pitch ...
32 views

### Multiply FS Coefficients by 0 or 1 to get Low Pass Filter?

I have written a bit of code to upsample and interpolate a sample waveform in MATLAB. It's at the point where I have taken a signal, upsampled it 2x and filled in the gaps with 0's, and then I found ...
30 views

### Given h(t)~H($\omega$) Fourier transform pair, what is the counterpart of H(-$\omega$) [on hold]

Thanks in advance. Any help will be much appreciated.
43 views

### Side lobes not visible in FFT of rect function

I was making a plot to show side lobes for different spectral windows and I noticed if I take a simple fft of a rectangle window, I don't see any side lobes. I think I'm just making a simple mistake. ...
36 views

### Limitations of Arithmetic coding?

I have been working on an assignment for university in which I have to compress an 80K message consisting of only two symbols, 'a' and 'b', having probability values of 0.6 and 0.4. I have ...
33 views

### Gentle request for explanation on LPC and LPCC coefficients :)

If I understand what LPC does, I think. It predicts the next sample by taking into account previous $p$ samples. I don't understand why it is useful in DPS and speech recognition. I also came across ...
33 views

### How to calculate CWT entropy?

Assume that $W(a_i,t), i=1;2;...;M$ is a set of wavelet coefficients. The Shannon wavelet entropy is calculated by: $E=-\sum_{i=1}^{M}d_i log(d_i)$ $\rightarrow$ where $d_i$ is:$\rightarrow$ ...
26 views

### Undersampling of a non periodic pulse signal

I am starting getting familiar with electronics, consider me as a newbie.. I am facing a sampling trouble with my DAQ system. I have a non periodical pulsed signal in the range of 0.3 to 1kHz. The ...
45 views

### Matlab SOS Filter in C++

I'm struggling to validate that my C++ implementation of a filter I designed in Matlab is correct. My first issue is to make sure I'm implementing the sections in the right order. This is the output ...
24 views

### Gabor Filter Parameter

I am doing research on images using gabor filter. I have read the following post: Apply a Gabor filter to an input image There must be some formula to determine the value for ...
21 views

### Mutual information between speakers utterance

I want to compute the Mutual Information (MI) between each sub-band of the speakers. However, I am confused about it. Let's explain it in other way. Suppose that we have N speakers who pronounce M ...
10 views

### samppling schemes for 2D data [on hold]

can someone help me to know about all sampling schemes available for 2d dataset. I have searched a lot regarding schems like random sampling, poisson disc sampling,startified sampling. My aim was to ...
37 views

### what is Shannon entropy?

I was reading a paper about finding optimal morlet wavelet function for CWT, and they were minimizing Shannon entropy. what is Shannon entropy and it uses? (specially on continuous wavelet transform)
49 views

### Sampling Theory in Signal Processing

In signal processing, when you sampling an analog signal, the sampling theory says that the sampling frequency needs to be at least twice the maximum frequency in the analog signal content. I ...
32 views

### Downsampling a PSD that was generated by zero-padding - worth it?

Let us say we have a signal $y(k)$ that is of length $K$. I can compute its PSD, also of length $K$. Let us say that this length was not good for finding peaks, so I computed a PSD that was of length ...
20 views

### Detecting scene transitions in a video

How would you reliably detect scene transitions in a video? The simplest case wouldn't be too hard, but sometimes it might be a fast moving scene, or there might be an effect like lightning that would ...
10 views

### Decentralized vs Distributed control [on hold]

I have heard that decentralized is the controllers do not share any information while distributed they may share some information. Could someone please provide a reference where I can verify this ...
34 views

### What are the tradeoffs for more coefficients for fractional delay filter?

Is there a rule of thumb for how many coefficients to choose for a fractional delay filter? I figure there might be a trade off based on the signal frequency as well as my sample rate (this is ...
27 views

### How to compare vocal words in matlab

We as a group are new to signal processing and speech recognition. We have stored .wav sounds of three different words and we are trying to record a new .wav sound and have the system compare the ...
127 views

### Is sinusoids the nature's default signals?

I know the basic working principle of sinusoidal oscillators. But I have a doubt on this matter when I came across Gram-Schmidt orthogonalization procedure. I have read that the source for sinusoid ...
34 views

### Why do I have to use variance and not mean value to calculate noise?

Why, when I have to calculate some types of noise (for example shot noise and others which are in the denominator of SNR ratio) or attenuation from turbulence, I have to use variance of the of the ...
12 views

### Estimating degree of motion in video frames

I have a video (in webm format), and I want to produce a graph that shows the degree of motion in this video as a function of video time. I'm sure there are many different ways to define "degree of ...
43 views

### Purpose of eigenspace of covariance matrix of a blob?

Given a blob of an image (representing an object), according to Wikipedia, we can compute the co-variance matrix using the image moments. I understand that the eigenvectors of that matrix can be used ...
27 views

### Estimating and Improving the accuracy of fourier transform in the low frequency sector

I have a time series file which starts with 1 and then quickly tends to oscillating about 0.001. The time series has a resolution of 0.01s and has 10^6 sequential points starting from t=0. The goal is ...
27 views

### Arduino Kalman Filter [on hold]

I'm not sure if this question is more applicable here or in the electrical engineering SE site. I'm trying here first, but feel free to migrate if you feel it's off topic. My question: I'm ...
15 views

### RLS Lattice vs Transversal

I have the RLS algorithm implemented in two different ways - transversal and lattice. I was expecting them both to behave the same way, but they don't! Transversal seems to converge faster than ...
26 views

### Short term energy signal explanation

I'm trying to calculate the short term energy of a digital signal in python, using a rectangular window, but don't understand the basics of how this works, a pointer to any good explanation would be ...
37 views

### Compressive Sensing-Incoherence Principle

As people acquainted with Compressive Sensing would know, incoherence and sparsity are two main principles. I've been reading about compressive sampling and developed an interest into the topic. What ...
60 views

### How do we know that CTFT of the autocorrelation function is the PSD?

I know that the Fourier Transform of the autocorrelation function is the Power Spectral Density. But how can we arrive at such a result intuitively? Is it just a theorem?
30 views

### How to determine Hilbert coefficients

I want to take a real signal on my FPGA and create a complex one. I have FIR core implemted for a Hilbert Transform, and Xilinx's datasheet on it shows coefficients of: ...
23 views

### Problem in decoding on PocketSphinx on Raspberry Pi [closed]

I am getting the error FATAL_ERROR: "batch.c", line 819: PocketSphinx decoder init failed when decoding. It works fine on Sphinx3, but when compiling on Raspberry Pi using PocketSphinx i am getting ...
41 views

I a recent topic, it has been told that zero-padding in the STFT can improve it, and avoid some circular convolution related things. Here is my Python code for STFT : ...
33 views

### Wavelet signal analysis for ultrasound echo

I am new to the wavelet field, and I am working with ultrasound signal. For my study, I needed to measure material using the pulse echo reflection method. Basically, when the transducer transmits ...
14 views

What do I use for the parameters (si, fsz, m and pp) ...
59 views

### Tune a piece of music

Suppose I have an instrument which is out of tune. For example lets say, as an example, the notes it plays are as follows: C+20 cents, C#+20 cents, D+20 cents D#+20cents etc. In other words, it plays ...