The tag has no usage guidance.

learn more… | top users | synonyms

0
votes
0answers
13 views

How to identify a similar voice audio?

I want to implement an application where given an audio containing a speech as query,it returns the most similar audio that was already submitted by an other user. Here two audio are similar if they ...
1
vote
1answer
32 views

Difference between $\tt rand()$ and $\tt randn()$ in MATLAB

rand() is for "Uniformly distributed pseudorandom numbers" I generate two rand arrays, and then use the cross-correlation ...
3
votes
2answers
20 views

How to properly time-shift a function in relation to another function

I'm stuck on a time-variance question in my homework and I think it has something to do with my understanding of how time shifting functions works. The problem asks to determine whether the system ...
3
votes
2answers
62 views

Does “keying on” a sine wave at a zero-crossing reduce its bandwidth?

I understand that a pure sine wave of infinite duration occupies no bandwidth, i.e. it is only the modulation of a carrier that gives it sidebands. Does the exact timing of a sudden modulation make ...
0
votes
1answer
41 views

What is a technique to extract phase and amplitude from a signal given a wavelength? [on hold]

Can someone help me identify or point me in the direction of a DSP technique where I can: Input a signal, and specify a wavelength/period, and in return, get the amplitude and phase at each time ...
1
vote
1answer
36 views

Upsampling and zero order hold

Maybe to someone this question may seem quite easy but I have a problem grasping it. Namely, assume that we have two systems A and B with sampling rates $f_A$ and $f_B$ where $f_A>f_B$ and ...
3
votes
2answers
45 views

Goodness of fit for complex valued curves (i.e. frequency responses in frequency domain)

My apologies for perhaps the stupidity of this question. Presume that one has the 'frequency response' $Y_{data}(k)$ of a system and also has an estimated model $Y_{syn}(k)$ that fits the data. How ...
1
vote
1answer
35 views

Wavelet transform in MATLAB

Suppose I have a wave with $20 \textrm{ kHz}$, $100 \textrm{ kHz}$ and $300 \textrm{ kHz}$. Sampling frequency used is $1000 \textrm{ kHz}$. I apply the discrete wavelet transform on the wave like ...
0
votes
0answers
24 views

How do we find the Power Spectrum Density (PSD) and which data type is valid for that?

I want a simple explanation on how to find PSD and which type of data (in which units, I mean) can be used for doing so. If found similar interesting questions 1 & 2 and some on Mathworks, like ...
0
votes
0answers
13 views

FFT of an acceleration response signal?

I am working to solve an equation of motion in simulink. I run the simulation for 10 seconds and got a plot for disturbance torque. The plot shows me 10s on x-axis with some magnitude of signal on ...
2
votes
1answer
32 views

Implementing Welch's method for Power Spectral Density

I want to implement Welch's method for PSD calculation in MATLAB. I do not want to use built in MATLAB cpsd function, such that I can change the FFT implementation ...
0
votes
1answer
25 views

Methods for calculating signal quality metric

i'm sure this is a fairly large topic area, but I'm not quite sure where to start. I have a signal in which I can change several parameters, such as the frequency, gain, etc. The modulation is a ...
3
votes
2answers
56 views

Useful natural “Hilbert-like” $n$-uples and $n$-fold "analytic signals

If $\mathcal{H}$ denotes the Hilbert transform, the analytic signal of a signal $x(t)$ is $$x_a(t) = x(t) +\imath \mathcal{H}(x(t))\,.$$ The real and imaginary parts form Hilbert pairs. Are there ...
0
votes
0answers
27 views

How do I correctly receive a signal using a signal analyzer?

For the past few weeks, I have been trying to send a Zaddof Chu signal using a vector signal generator, and receive it using a signal analyzer. Both devices are made by R&S. However, the signal ...
3
votes
2answers
55 views

How to detect decaying oscillations in a signal

I have a sampled signal which contains (among other things) some damped oscillations. From the underlying theory I have reasons to believe that it can be characterized by some specific frequencies of ...
1
vote
1answer
67 views

Determining the fundamental frequency/pitch of a note

What I am trying to achieve is getting the fundamental frequency of a note played by an instrument. What I have already done is performing an FFT on a samples of audio file, and here's what I get: ...
2
votes
1answer
31 views

Cyclic prefix vs. guard interval. Why use one over the other?

I'm currently studying some OFDM techniques, and have found that in order to avoid Inter-Symbol Interference (ISI), there needs to be some space in between symbols. Lets assume this length to be ...
2
votes
1answer
47 views

Definition of energy of a signal

I was wondering why the energy of a signal is defined as $$E=\int_{-\infty}^{\infty}|x(t)|^2dt$$ I mean, I know that it is a definition, but is there a physical reason for it being defined like ...
0
votes
0answers
15 views

GPS signal acquisition

I have a set of GPS satellite signal data, the set is 1 ms long and has the information of two satellites (satellite number, code phase and frequency) buried in noise. This data has a carrier ...
0
votes
1answer
25 views

Division of complex signal by frequency response

I have a measured signal (time domain) which i take the fft of. I have a measured frequency dependent sensitivity (magnitude and phase (radians) as a function of frequency) which I need to apply to ...
0
votes
1answer
28 views

Confusion with regards to units in Sinc pulse

I am currently reading a section in the Handbook for MRI Pulse Sequence book where it says that the time-bandwidth product for a SINC pulse is given by: $$ T \Delta f = Z $$ where $T$ is the length ...
0
votes
0answers
45 views

Practical diversity combining at receivers (Maximal Ratio Combining & Equal Gain Combining)

I am trying to perform practical diversity combining implemented in GNU Radio by using Ettus N210 USRPs, one as a transmitter and two as receivers. To compare Equal Gain Combining (EGC) and Maximal ...
0
votes
0answers
26 views

How to calculate transmission capacity of a channel with multiple frequencies? [duplicate]

So I have the following question: If a transmission channel uses an analog carrier wave that is modulated by eight amplitudes and sixteen frequencies per bit time, then what is the ...
5
votes
4answers
96 views

Acoustic Scenarios With Negative SNR

For all the practicing engineers out there: Where have you encountered a negative SNR? How negative, in dB, was it or estimated to be? Where would you expect to encounter a negative SNR? Note: ...
0
votes
1answer
59 views

When does the convolution of $2$ signals equals zero?

For example, how can I determine if the convolution of $x(t)$ with $y(t)$ is equal to $0$?
1
vote
0answers
26 views

How do I find amplitude modulation effects in natural signals

It is relatively easy to discover overlaid (additive) signals in natural phenomena using wavelet decomposition, Fourier Transforms, CEEMD, etc, because addition in the time domain is the same as ...
0
votes
1answer
71 views

Plotting Power Spectrum (Matlab)

I want to make a plot of the power spectrum for a .wav sound file, over the frequency range from -2000 to 2000 Hz. Attempt: I used the following code, but the resulting plot is one sided. It doesn't ...
1
vote
2answers
42 views

Generating very short signals

So I need to program (using Java) some things that include generated sounds. I am struggling to understand how to make it work because I require a rather short signal while still using a sampling rate ...
0
votes
2answers
64 views

Filter Design in Matlab

I want to design a filter to remove all frequency components from a .wav file except those within $\pm 25\,\text{Hz}$ of $523\,\text{Hz}$ as well as its harmonics (up to the Nyquist frequency). ...
0
votes
2answers
34 views

A question about the concept of the time

$\delta[n+1]$ equals to one only $n+1 = 0$ ? If the 1. is true, so what does a signal $x[n+1] $ stand for? Is this signal causal or anticausal? I mean, if 1. is true, $n = -1$, so is this signal ...
0
votes
1answer
28 views

Proving conditions for controllability

Let's say I have the following LTI system: $$\dot{x}(t) = \mathbf{A} x(t) + \mathbf{B} u(t)$$ I need to somehow show the following is true or false (proof): This system is controllable if and only ...
3
votes
1answer
33 views

what are the Pros and Cons of ESPRIT and MUSIC algorythms?

On wikipedia there are only 2 lines about ESPRIT: Estimation of signal parameters via rotational invariant techniques (ESPRIT)... MUSIC doesnt have an entry in the music disambiguation page, other ...
0
votes
2answers
53 views

What is the difference between a'mixer' and a ' multiplier' used in modulation process?

I am not sure if it is valid to conclude that a mixer produces a difference/sum of frequencies at output ,while multiplier produces multiples of frequency at its output. I am keen to know how far I ...
4
votes
1answer
72 views

Random sampling vs uniform sampling

In this paper of Lustig, he speaks about a something which appears unintuitive: sampling at random may exhibit better performance than sampling uniformly. I tried to understand this starting from page ...
0
votes
0answers
23 views

What would be a quick way to set up a resonance experiment using python? [closed]

I have done research on resonance and resonators and, for fun, I would like to build an experiment to test if I can predict the resonant frequencies of a few bottles. The major issue that I'm running ...
0
votes
1answer
18 views

The signal in MRI

I am trying to understand the signal formation in MRI and have a confusion. I understand that in the presence of the external magnetic field $B0$, the protons are precessing at the frequency given by ...
0
votes
2answers
45 views

Power of a speech signal

I have been asked to calculate the power of a speech signal given by the following: $$\ p(x)= \left(\frac a2\right)e^{-a\mid x \mid}$$ I know the formula for the power of a signal to be the ...
0
votes
0answers
30 views

how to deal with spiky signals?

I have few spiky signals and I'm struggling to deal with them. Here a sample: signal sample As you can see there is base amplitude do not change with the time elapsed. For this reason I believe the ...
0
votes
1answer
25 views

Periodogram frequencies not matching with signals

I am new to signal processing world. I am working on a project where we have to find change points using spectral densities. I am running some simulations where in I created a wave which is a linear ...
0
votes
2answers
44 views

Accessing maximum value from singular value decomposed matrix

I have read few image enhancement papers, where an image is enhanced in transformed domain using either DCT or DWT with SVD. Few of such works can be studied from link_1,link_2, link_3 . In these ...
2
votes
2answers
42 views

detect to rising, stable and falling point in non-smooth rectangular wave

I am working on basic signal processing problems in MATLAB. I have found a signal from the internet (i don't remember the site exactly). The data is organized in column wise. 1st and 2nd column is ...
0
votes
1answer
33 views

Showing a system is always controllable?

I need to show that the following system is always controllable: \begin{align}A &= \begin{bmatrix} -\alpha_1I_{k\times k}& -\alpha_2I_{k\times k}& \cdots &-\alpha_{n-1}I_{k\times ...
0
votes
1answer
44 views

detection of similar segments of two signal

I have two signals, the first is a reference signal from which I selected a segment. I'm trying to find which segment of the other signal is the most similar to this selected segment. I'd be glad ...
0
votes
2answers
35 views

Wavelet filter coefficients from scaling filter coefficients

I am trying to develop a new type of wavelets and I found out a function that following a particular two scale relation. The function at a scale $t$ say $x(t)$ can be related in a finer scale $x(2t)$ ...
0
votes
2answers
43 views

Pre-emphasis filter design

I am using the standard MATLAB filter function to design pre-emphasis filter. However, I am getting the wrong results back! I have the ground truth so I can check ...
3
votes
2answers
158 views

Special case: Band-limited in time domain and band-limited in frequency domain

I know except for some special cases, aliasing is unavoidable. Assume we time-limit a function, $f(t)$, so that it is zero outside an interval say $[0,T]$ to form $y(t)$. Then, in the frequency ...
0
votes
0answers
44 views

Choosing correct filter parameters for IMU sensor datas

I have a IMU sensor breakoutboard using ITG3701, LSM303D LinkProduct. This involves accelerometer, gyroscope and magnetometer. I have connected the sensors to a Arduino and sending the datas to ...
0
votes
1answer
48 views

What is the absolute phase and the relative phase, of a signal?

I need to know what is the absolute phase and the relative phase, of a signal? and why these phases are important in the signal processing?
1
vote
1answer
33 views

Why Fourier transform and Stockwell-transform retain the absolute phase information of one signal?

Hello friends am studying the topic of signal processing and the Fourier transform and the s-transform and in most books as for example "Time-Frequency Signal Analysis and Processing. 2nd" of Boashash ...
0
votes
1answer
23 views

Autocorrelation of a noisy linear map

I am interested in calculating the autocorrelation function of a linear map with some noise (model given below) but am slightly confused in doing so. At first, I did not realize there were two ...