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4
votes
5answers
269 views

FFT Processing Gain

When transforming a noisy signal via Fast Fourier Transform from time to frequency domain there is a "Processing gain" of the FFT which increases as number of bins increases. I.e. the more bins I have ...
0
votes
1answer
45 views

Extracting a signal from data array in non real time - best approach?

I have several thousand values from an ADC sampling at 5MSPS. I want to extract/enhance a signal in the data (16 bit, sinusoidal) between 50kHz and 200kHz. It is not real time - the ADC has stopped ...
2
votes
1answer
51 views

Forecasting noisy data with polynomials

What's the best way to incorporate polynomials or sinusoidal equations into a linear model to predict a future amplitude in this sort of data? You can see that if those polynomials continued to go on, ...
0
votes
0answers
12 views

Normally Distributed Frequency Drift in Signal Processing

I have a synthetic signal and an observed signal that are discritized in time, due to the sampling rate and it is only measuring magnitude. The synthetic signal assumes a frequency while the observed ...
1
vote
0answers
58 views

Finding a signal in noisy data

I have a large data set that was collected by a 5 GHz oscilloscope, so I basically have an array of voltages with each index being a very small time step apart. I am looking for a specific signal in ...
0
votes
1answer
207 views

Time-frequency representation of sound signal using Matlab

I am currently doing a project on sound signal processing by using MATLAB. I have a problem regarding creating the command line so that I can get a graph containing frequency by its time. But this ...
0
votes
2answers
131 views

How to get the 10-5 most dominant frequency in an audio signal

I have this wav file that I recorded using my laptop, It contains the sound of a G chord of a guitar. Since the guitar have 6 strings the sound should contain different frequencies I want to determine ...
3
votes
2answers
76 views

What is the state of the art for vocal elimination/reduction?

I have no background in signal processing but I would like to know what is the actual state of the art for vocal elimination/reduction. Obviously, I am not talking about the infamous "stereo ...
1
vote
4answers
172 views

given a mixture of two signals, how to separate it to its base components?

I have a signal that contains two components. How can I separate it two its two components in matlab? Please note that the location and shape of components are different in each experiment and we do a ...
0
votes
2answers
720 views

How to analyze audio input/spectrum correctly

I am quite new to Java and Signal Processing, but I was assigned a project dealing in audio processing. My topic given to me is a game that has a component of analyzing a song (any given song) and ...
1
vote
3answers
126 views

What is a window function in DSP and why do we need it?

When designing digital filters we start off with FIR and IIR. Later on we talk about window functions e.g Kaiser and Hamming windows. I do not understand why we need so many type of window functions ...
1
vote
4answers
192 views

Best signal processing method for this application?

I have a signal I'm getting from a sensor (shown below in the photo of an excel plot) and I need to process it to get it to look something like the red line I've overdrawn on it. Sort of a moving ...
2
votes
1answer
78 views

Is video considered a Tensor?

A sampled single dimensional signal is a vector. A sampled image is a matrix. Is video considered a rank-3 tensor since it is a set of images stacked on top of each other?
-1
votes
1answer
53 views

benefit of dividing the signal processing job into two computers? [closed]

I am not sure if this is the right place to ask this question. I am asking it anyway.. In Aircraft Airbus 320, control inputs from the pilot's sidestick are processed by two computers for different ...
2
votes
0answers
47 views

Log LUT applied before bebayering vs applied to RGB

In order to get more detail when encoding the blacks, a log LUT is going to be applied to the pixel values. Like gamma, the logical place to do it in the image processing pipeline is after ...
5
votes
3answers
859 views

How do I go about detecting whistles, pops and other sounds in live audio input?

I've read many questions on SO, and frankly, each one of them is not describing any particular way to go about it. Some say "do fft" and some say "zero crossing" etc. But I've only gone as far as ...
1
vote
2answers
334 views

generating ultrasonic sound in matlab

I am working for my class project on making animal repellent , I need to know how I could go about taking a normal audio file and shift its frequency/Pitch very high to make it an ultrasonic sound.
0
votes
3answers
2k views

Best method to extract phase shift between 2 sinosoids, from data provided

I have been asking around if the way I was extracting phase shift (lag) was correct, and I ran into some trouble... so in general, given 2 arrays of data of the same length, one represents the input ...
0
votes
1answer
104 views

Computation time 1) fft, 2) 2-d convolution, 3) two 1-d convolution

Consider filtering square n*n images by square,separable m*m filters. What are the general computation time for the following approaches 1) FFT 2) by 2-D convolution 3) by two 1-D convolutions. ...
1
vote
0answers
74 views

Gauss Markov Process

I am trying to generate a random signal that represents a gyroscope drift. I know the Allan Variance characteristics of the signal (ARW, RRW, Bias Instability and Cluster Time for for Bias ...
6
votes
2answers
939 views

Understanding the parameters for a Bilateral Filter

Allow me to show you a snip from Szeliski's Computer Vision book on bilateral filter. I don't know how to interpret these kernel definitions: In the actual summation what values do the $k$ and $l$ ...
5
votes
2answers
289 views

Calculating bpm from machine sound (not music)

I have a hydraulic breaker on a excavator that hammers with a dynamic bpm. I have recorded this sound so that it is in a mp3-file and would like to determine the momentary bpm for the length of the ...
2
votes
1answer
82 views

Contrast Enhancement for subjects under Flash

For a machine vision application, we take short duration (50uSec) monochrome pictures with IR flash. The images we get are decent quality however the light color subjects (light blue, light green, ...