The signal-analysis tag has no wiki summary.
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43 views
formant frequency bandwidth of LPC root
For formant estimation from LP polynomial roots, more roots amplitude shows that poles is near to unit circle in Z-domain but
Can anyone explain why the bandwidth of the formats must be small ?
I have ...
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2answers
86 views
Main differences to take into account between continuous and discrete time signals
I started studying DSP and the first things that came out were the differences between continuous and discrete time signals. So, I was wondering if I understood well these concepts before I keep going ...
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30 views
signal seperation [duplicate]
I am want to separate music signal from the singer signal and eliminate the music once I do the transform using discrete wavelet but it don't know how can I sort it by frequency.
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2answers
51 views
Possible to break out complex WiFi signal?
Is it possible to break out the i and q of a complex WiFi signal? If I have a laptop with a standard WiFi card in it, could I break out the i and q in analog, or upon sampling in an FPGA via digital ...
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23 views
algorithm for audio and video separation using matlab [migrated]
sir
i want to design an algorithm which can take a movie clip or a video signal having both audio and video and extract the audio and video part separate using the help of filters, matlab and signal ...
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0answers
67 views
How exactly does MATLAB zeropad?
I am doing some massive number crunching in MATLAB which involves millions of PSD estimations. Each data segment has length 41. So I have been using the multi-taper method with nfft=41 (details below ...
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33 views
Detecting Regions of Constant Value
As an experiment, I have been trying to use cross-correlation to do approximate string matching. Specifically, I want to find the location of where a PORTION of one string (string A) is the ...
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30 views
Reg: Sampling for Non band-limited Signals [closed]
I need a Matlab Code for Sampling of Non-Bandlimited Signals as a part of my project. Can Anyone help me out here by giving the code or any other way of getting it?
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2answers
213 views
How do I determine if a discrete signal is periodic or not?
I want to know how I can determine whether a series of data is periodic or not.
I want to use Fourier transform/series. My data looks either aperiodic
[111100001111000110010101010000101]
or ...
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3answers
113 views
Generalized Cross Correlation
What is the definition of Generalized Cross Correlation?
I need it for estimating the delay (time offset) between two audio signals. The time offset between the two signals might be as large as ...
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1answer
44 views
doing sine regression to recover the paramters from a given signal
I have a discrete signal.
I want to do sinusidal regression to estimate the parameters
such as amplitude,phase, frequency etc
It is important to note I only have the signal values and
...
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1answer
65 views
Find the time lag for a wave
suppose that we have a wave which has some peaks in some indexes like 2,12,25,... and otherwise zero.
I want to extract the time lag or lags between peaks of a signal. could anyone help me ?
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2answers
69 views
Ways to analyze electrical signals without FFT?
I am collecting a 15Hz sine wave at 1500Hz. Therefore, every 100 points of data collected should contain a single complete sine wave. If I sample for 10 seconds, I will have 15000 points of data. If ...
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2answers
124 views
FFT for a single frequency
I was looking for a more efficient way of finding the magnitude and phase of a signal at a certain frequency without performing an FFT because it produces more information than I need and I came ...
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0answers
23 views
Intuition of Location on the Conic Axis TDOA solution
In an old paper "A New Approach to Geometry of Range Difference Location", there is a mathematical derivation that does not include any mention of the relationship to the underlying problem. In the ...
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1answer
71 views
How to calculate the energy levels of frequency intervals of an audio signal?
Using the Fourier transformation I can translate a signal from the time-domain to the frequency-domain. If I divide the frequency axis into intervals, how can I calculate the audios signals energy for ...
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0answers
41 views
Are there any measurements or test for whether an audio signal is stationary?
I need to divide an audio signal into frames in which the signal can be assumed to be stationary. How can I measure whether an audio signal is stationary in a frame?
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1answer
110 views
How to get fundamental frequency of a signal using autocorrelation?
I am trying to get the fundamental frequency of a signal that only has a single pitch. I coded out the autocorrelation function using FFT and already got the autocorrelation result. Unfortunately, I ...
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62 views
How to measure the short-time change in an audio signal?
The choice of frame length for calculating the Mel Frequency Cepstral Coefficients of a signal, depend on the how much the signal change over a small time scale.
I guess that human speech change ...
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1answer
76 views
Determine the optimum receiver and the corresponding $P_{eM}$ for an AWGN channel
I have a source that emits $M$ equiprobable messages, which are assigned signals $s_1, \dots,s_M,$ that are equidistant by $a$. That is, if we plot the $s_k$ signals in a horizontal axis they are dots ...
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1answer
51 views
FFT function isn't working on imported signals greater than a second
I have an fft function in matlab/octave that works great on an imported mono wav/audio signal that is 1 second long, but when the signal imported is more than 1 second the frequency values become ...
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2answers
121 views
Finding the maximum of a real valued trigonometric polynomial
I have been posting all over SE looking for a good method of finding the maximum of a trigonometric polynomial. A trigonometric polynomial is the sum of a set of sinusoids,
$$a_0 + \sum_{k = 1}^{N} ...
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1answer
76 views
Representation of frame image pixels
In paper Human identification using gaits Section 3.2, the authors explain how to represent a 3D image (x,y,t) into 2D image with (x,t) ; (y,t) denoted 1D signals. I have a conceptual doubt which is ...
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2answers
206 views
Why complex numbers are represents as a+ib and can't be as (a,b)?
I am confused as why do we need to represent the complex numbers with the imaginary y-axis if we can simply represent them as (x,y) ?
I've read that Multiplication by i is an anti-clockwise rotation ...
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1answer
50 views
Shifting / Permutation of an array taking a long time [closed]
I'm using matlab/octave and would like some help trying to improve the speed of my code. I've tried to vectorize the code but I run out of memory so I went back to for loops. What I'm trying to do ...
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0answers
21 views
Compare luminosity beetween groups of images
We have a set of images which are immunofluorescence stainings of mice brain slices. These image show the expression level of a marked protein.
We have two groups of mice, which underwent behavioral ...
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5answers
365 views
Dsp programming in C/C++
I have exposure to MATLAB and have some basic exposure to signal processing and plotting in MATLAB... but I am more comfortable with C/C++ than MATLAB because I have been working in Image processing ...
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0answers
59 views
Voice sample prediction scheme
I have some telephone voice audio with occasional "blips" in the audio. The blips appear to come from an IP link buried in the PSTN (this is a conceptual explanation, so don't worry about things like ...
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5answers
231 views
What are some methods for detecting a sinusoid in noise?
I'm looking for a broad classification on the kinds of techniques available. Something I can use to begin a literature survey.
Some details:
should be feasible for real-time implementation.
Binary ...
3
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1answer
91 views
The meaning of $k \delta (t)$
Reading the signal literature I often come across the expression $k \delta (t)$ where $k$ is a constant. I presume this is a notation to suggest we are referring to the area or strength of the Dirac ...
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2answers
95 views
Frequency of a periodic signal with distortions
I would like to evaluate frequency of some unstable periodic signal coming from a detector:
The signal is registered continuously and may or may not be present (i.e. be periodic). The frequency ...
3
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0answers
31 views
Assumptions for Hurst exponent calculation
Are there any general assumptions for the calculation of the Hurst exponent?
Does the signal need to be stationary, for example?
Does it depend on the method?
What about the length of the time ...
1
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1answer
331 views
Help calculating / understanding the MFCCs: Mel-Frequency Cepstrum Coefficients
I've been reading bits and pieces online but I just can't piece it all together. I have some background knowledge of signals / DSP stuff which should be enough prerequisites for this. I'm interested ...
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1answer
82 views
Use Butterworth and Chebychev filters
I need to calculate frequency response, phase response and apply to signals the Butterworth, Chebychev1 and Chebychev2 band-pass filters.
I'm developing in C++ with Qt, and I'm looking for algorithms ...
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1answer
280 views
I and Q components and the difference between QPSK and 4QAM
Both 4QAM and QPSK apparently produce the same waveform, but are they the same mathematically?
In a QPSK constellation, are the mapping points at 45, 135, 225 and 315 degrees while the 4QAM is at 0, ...
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3answers
88 views
Signature of a Signal for anomaly detection in Power Systems
I am a power systems engineer and am doing preliminary leg-work for detection of a specific anomaly in power systems that cause the observed waveform to be distorted. False positives are somewhat ...
3
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2answers
179 views
Sum of sines sound wave using microcontroller
I need to produce a signal which contains only several frequencies, for example, 17KHz, 17.2 kHz,17.6 kHz. The components I'm using are microcontroller (PIC16F1783 by microchip) which works at 80 kHz ...
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1answer
191 views
Producing Colored Noise from a given PSD Data
I need to estimate (extract/produce) the colored noise of a given PSD Data. I have the following procedure to get the desired results.
First of all I calculate the filter coefficiencts using firls ...
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1answer
411 views
Showing frequency and amplitude after doing an FFT on a signal
I have executed an FFT on a .wav file of a person saying "ahhh" which shows the frequency and amplitude of the audio file. When I run it on a .wav file it shows the frequency 0 Hz as having the ...
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1answer
136 views
Extracting audio track to determine the song beat
I'm completely new to this field.
Perhaps I'm calling it by a wrong name, but I want to analyze an audio track and retrieve a timestamp to beat mapping.
Is there an open source 3rd party library ...
