The tag has no wiki summary.

learn more… | top users | synonyms

-1
votes
0answers
13 views

How to attain the frequency vs time graph of a .mp3 file

I'd like to plot a graph of frequency vs time for a given mp3 file using either Processing or freemat, any clue on how to do that. Also this might be overkill, but if I were to get a frequency vs time ...
0
votes
1answer
20 views

Cancelling the acoustic echo that occurs with a variable delay and volume

I am trying to build a software that records audio to a server and then broadcasts that audio into the same room that the microphone is present. This means that the audio signal is uploaded to the ...
0
votes
0answers
18 views

Find similarity rating in trajectories

I've got trajectories encoded in black and white. These are stored in a matrix with dimensions 150x150 (i.e. black = 1, white = 0). An example of two trajectories below (plotted): My objective is ...
0
votes
2answers
27 views

print a date and time in command window MATLAB [closed]

I use matlab R2015a, when I run my script I want print the date and the time of exection I tried this code ...
1
vote
0answers
22 views

what is the difference among noise,blurring and contrast? [closed]

I want to know the following what is the difference among noise,blurring and contrast ?
0
votes
0answers
9 views

EEGLAB: going from a .bdf file to a MATLAB matrix

I am looking for the assistance of someone familiar with EEGlab (for MATLAB). I'm using an online dataset from this site, just trial 1 for now. Essentially I have a bdf file and an elp file, and I ...
0
votes
0answers
43 views

Velocity from acceleration data

I have an acceleration data from accelerometers. I want to get velocity from the data by integrate it using matlab. Here my coding :- ...
0
votes
0answers
8 views

significance of real valued coefficient and complex valued coefficient

What is the significanceof real valued coefficient and complex valued coefficient with respect to DCT and DFT.And how does it effect signal processing?
1
vote
1answer
62 views

Controlling one signal with another one (Rocket engine effect - Subtractive synthesis of sound)

I programming some sound effects in Java and exporting them into .wav files. Currently, I am trying to program a rocket engine sound effect. I want to do it in the following way: The sound of a ...
2
votes
2answers
63 views

Why do we care if a system is BIBO stable?

I'm wondering what the actual application of this tidbit of knowledge is. I am currently a student in a Computer Engineering undergraduate program and I was wondering what the applicability of this ...
0
votes
1answer
34 views

Signal remains constant when implementing FSK

I am trying to implement FSK Modulation. For bit 0 and 1, I defined a frequency wave (for instance, for bit 1, c = cos(2pift), with t = 0 : 1/fs : (1/fs)*N - 1/fs, where fs is the data rate). When I'm ...
0
votes
5answers
95 views

Looking for an algorithm that computes “Similarity” between two signals

I'm new in this forum! ... and I'm not an expert in signal processing! ... So I hope to find help here:-) I was wondering if someone could point me to an algorithm/technique that is used to compare ...
1
vote
0answers
54 views

How to perform FFT on stored digital data [closed]

I have to do FFT in MATLAB on the digital sinusoidal data that is stored in excel. please find the amplitude values of the sine wave discrete signal stored in the Lookup table. Number of points : ...
0
votes
1answer
56 views

When do we normalize data in audio processing?

Lets assume we have a simple audio processing flow with preprocessing, feature-extraction and classification. Where and why do we normalize the data? I know the purpose of normalizing the data in ...
1
vote
0answers
93 views

Processing IQ signals [closed]

Signal Characteristics: The IF (I/Q) signal consists of a DC component and an AC component. DC Component: 2.52V; AC Component: 1.72 – 2.04 V (V P-P); BW: 20Hz - 500kHz; Power: 20dB Requirement: Now ...
0
votes
2answers
173 views

Tutorial for a stereo Phaser in C++?

I was searching for a tutorial on how to implement a stereo Phaser in C++. All i´ve found was sourcecode with little or no explanations which did´nt help me much. Does anyone know a Tutorial with ...
0
votes
6answers
170 views

Call recognition using Digital Signal Processing

We are looking for writing applications which would recognize Bird calls and Frog calls using Sound processing. EDIT: I want to identify the species of bird / frog and do not want to differentiate ...
0
votes
0answers
1k views

Radon Transform Implementation In Matlab

I know MATLAB has a built in Radon function, but I am working on implementing the radon transform in order to perform filtered back projection. As I started, my idea was multiple nested for loops for ...
0
votes
0answers
19 views

Image Registration Accuracy

I am doing image registration of aerial images with ground reference image. To extract the accuracy measure, one would have to obtain some sort of ground truth manually via selecting tie-points ...
0
votes
0answers
38 views

What filters used in this picture?

What filters are used to get an image like one on the left? I need to find body pose of a person in a picture.
0
votes
0answers
9 views

image recording

Can I know the delay between the time the PC receives the image and the time when it was acquired? I will record video with time stamp, which software it better for recording? Thank you!
1
vote
2answers
75 views

Ship detection from aerial image

I have an aerial image, like this I want to detect the outline of the ship without shadow. How can I do it? I tried threshold in both graylevel, RGB and HSV. It doesn't work perfectly.
4
votes
5answers
1k 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 ...
-1
votes
1answer
80 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
56 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, ...
1
vote
0answers
64 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 ...
1
vote
1answer
625 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
540 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
176 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
483 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 ...
1
vote
2answers
7k 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
612 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
199 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
84 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
55 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
60 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
2k 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
577 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
4k 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
125 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
81 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
2k 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
458 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
92 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, ...