Algorithm is a method expressed in a finite list of steps of well-defined instructions to process a signal.
0
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0answers
31 views
Are there any lossless embedding algorithm to support Haar(DWT) in audio watermarking?
I've been trying to do some research on audio watermarking and what i wanted is to insert string into audio file in the transform domain (DWT), i've read some literature of DWT especially HAAR ...
-2
votes
0answers
71 views
Low pass filter [closed]
I have a low pass filter specifications. In that they have mentioned interpolation factor as 4. Initially I did not know, how to do this. But i saw few threads which helped me to understand something. ...
3
votes
2answers
78 views
Using MFCC in spoken words recognition
We're trying to implement a "simple" speech recognition application in MATLAB (isolated words from a very limited dictionary). We've been trying the following methods:
Extract MFCC coefficients for ...
0
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0answers
125 views
What are the differences between the various FFT algorithms? [closed]
Wikipedia lists a number of different FFT algorithms:
Cooley–Tukey FFT algorithm, Prime-factor FFT algorithm, Bruun's FFT algorithm, Rader's FFT algorithm, and Bluestein's FFT algorithm
What are the ...
3
votes
1answer
86 views
Explanation of LidarBoost Algorithm?
I am trying to understand the LidarBoost algorithm as explained in this paper (PDF warning).
I don't understand how they take the original depth-images $Y_k$ and transform them into the up-sampled ...
1
vote
1answer
53 views
Fisher ratio or F_ratio
I am confused while writing code to implement Fisher’s F-ratio.
Suppose I have 4 speakers, each speaker pronounces 2 words and each word has 3 frames and each frame has 30 sub-bands.
$u$ is mean of ...
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1answer
47 views
Format location from LPC magnitude
I am confusing when I find the lpc roots magnitude, f1=0.9313, f2=0.9308, f3=0.91 and f4=0.95 but when I look at LPC envelope the f1 is higher than f4 in term of magnitude in dB.
Could anybody explain ...
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1answer
57 views
what is probability density function (PDF) of periodic signal
anybody knows what is the best pdf for periodic signal ?
I have signal with 480 samples (16000*0.03=480) but I could not find the exact pdf for that. sometimes it appear like 2 mixed Gaussian.
2
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0answers
23 views
How to get translation and roation data using 6DOF MPU6150
I am trying to get the position data from an IMU 6 Degrees of Freedom (MPU-6150) board using an Arduino Uno. I am trying Jeff Rowberg’s example MPU6050_DMP6.ino that may be found here.
This is the ...
5
votes
1answer
99 views
How to measure the agreement between to curves?
I have values (plotted below) of expected RSSI values over time that I would like to compare with my measured RSSI values. What I was looking for was a way to quantify it so I can change parameters ...
3
votes
1answer
43 views
object level sensor fusion for multiobject tracking
I want to fuse objects coming from several sensors, with different (sometimes overlapping!) fields of view. Having object lists, how can I determine whether some objects observed by different sensors ...
0
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1answer
46 views
Detect when someone has stopped talking
What's an extremely efficient way of detecting when a user has stopped talking into a microphone? When I use systems like Siri it can detect when I've stopped talking almost immediately, even when ...
4
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0answers
94 views
How does Songify work?
Does anyone know how does the "Songify" app algorithm work?
There are 2 inputs:
speech (or amateur singing), and
underlying music.
Somehow the speech is altered and mixed into the music. Which ...
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votes
1answer
62 views
What could an algorithm look like that iterates through all combinations of two variables to aim at a certain number of entries? [closed]
For background information, see "Some background" further down.
I have a list that looks like this:
Start-Time-In-Seconds;End-Time-In-Seconds
1;2
4;6
12;15
...
...
0
votes
2answers
103 views
FFT Data Array Indexing [closed]
I've been Googling "FIR filters" and "FFT convolution" etc. and I ran across something interesting.
Array Index vs. Pointers:
http://www.bores.com/courses/intro/program/7_array.htm
...
3
votes
1answer
80 views
Chirp z algorithm clarification
I am attempting to implement a chirp z algorithm to handle random sized DFTs, and I can not seem to obtain any meaningful results. I have gone over several write ups and "think" I have a handle on ...
2
votes
1answer
130 views
Texture mapping on a 3D face from 2D face image
I have 3D points (xyz) of a face image and I have 2D face image of the same person.
The 3D points of the face are such that If I project the points to 2D plane, it matches with the 2D face image.
I ...
2
votes
0answers
26 views
Phong Reflection Model Parameters
Question: Can anyone refer me the Phong reflection model parameters for a face image taken for web-cam?
Details:
I am doing 3D reconstruction of 2D images using 3D Morphable Model as in this paper ...
5
votes
2answers
121 views
Pisarenko Harmonic Decomposition
I'm attempting to code Pisarenko's method for some time-series data that I have.
I've had a look at a couple of papers, which explain in detail the theory behind it, but I'm having some trouble ...
3
votes
3answers
96 views
Optimal DC-free line encoding
I have a block of n bits that I'd like to encode into m bits that have an equal number of zeros and ones.
I looked at protocols like 8b/10b but it wastes 25% of the data to achieve balance.
As an ...
1
vote
1answer
83 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 ...
10
votes
2answers
167 views
Any references for the trade-off between software and mechanics/optics in industrial machine vision systems?
I explain my question with a simplified example.
I can design an industrial vision system for the automatic inspection of an item with these main requirements:
the image of a good piece must be a ...
1
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0answers
38 views
Looking for algorithm to extract line network from binary images [duplicate]
Possible Duplicate:
Looking for algorithm to extract line network from binary images within LabView
I would like to create a LabView VI that receives an input image and the RGB-color codes ...
2
votes
2answers
146 views
Question about Prony's method
I want to use Prony's method to fit a signal given by the sum of $p$ complex exponentials
$x[n]=\displaystyle{\sum_{k=1}^p} A_k{\rm e}^{\,{\rm j}\theta_k} {\rm e}^{2\pi\, {\rm j} f_k (n-1)}$.
The ...
2
votes
1answer
96 views
Safe Point Thinning Algorithm - How to?
I am relatively new to image processing and am working on a project that requires the thinning of binary images. In the literature, I've seen references to the Safe Point Thinning Algorithm(SPTA) ...
3
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0answers
88 views
Qualitative Evaluation of Interest-Point-Detectors and Descriptors in Computer Vision
I'm writing on a qualitative evaluation study of interest-point-detectors and descriptors. I've read all Mikolajczyk papers as well as most of the surves from Datta et al. etc. Now I'm implementing an ...
0
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1answer
94 views
Hidden Markov Model
I am trying to construct a Hidden Markov Model to predict the next state to go to.
I am doing an example system, or, a test system that contains the following:
Ok so the training I have used is:
...
5
votes
5answers
333 views
When to consider double (64 bit) floating point for Audio
When synthesizing and processing audio on modern processors, when would one consider using something other than single precision (32 bit) floating point? Obviously, the audio coming in and going out ...
0
votes
0answers
25 views
A few queries about 'Joint Image and Word Sense Discrimination For image Retrieval'
I had a query regarding the model used in the paper here. What would be the problem in going for a hierarchical clustering approach?
What they did:
We solve problem (ii) by cross-validation, trying ...
2
votes
1answer
686 views
algorithm for feature extraction from audio signals
I am trying to build a model for speaker identification, and I understand that the first step is to extract the features from the audio signals that are in my database. I have done quite a bit of ...
3
votes
1answer
177 views
Least-squares re-synthesis of Short-Time Fourier Transform
Working with my own Matlab implementation of the Short Time Fourier Transform (STFT), I've managed to write code for the analysis step where a 1D time-domain signal $s[t]$ is progressively windowed, ...
4
votes
6answers
1k views
Algorithm(s) to mix audio signals without clipping
I'd like to mix two or more PCM audio channels (eg recorded samples) digitally in an acoustically-faithful manner, preferably in near-real-time (meaning little or no peek-ahead).
The physically ...
2
votes
1answer
151 views
Speech Recognition Project - HMM
I am looking for advice on a project I am thinking about completing (for experience etc..)
My project is triggering a set of traffic lights (simulation) using Speech recognition. In theory, I want to ...
0
votes
1answer
158 views
Goertzel algorithm magnitude
I'm reading a Goertzel algorithm paper and an embedded article. I have several questions:
I don't understand why the the magnitude is calculated as follows:
$$\text{Magnitude} = y^2[n-2] + ...
5
votes
2answers
187 views
Which kind of machine learning algorithm is Hidden Markov Model?
I have used Hidden Markov Model algorithm for automated speech recognition in a signal processing class. Now going through Machine learning literature i see that algorithms are classified as ...
2
votes
2answers
94 views
Detect presence of a specific frequency (or lack thereof)
I know very little DSP beyond an intro undergrad course. I was looking to write a C algorithm that takes ADC samples and determines if a specific frequency is present (in the range of 100KHz); not ...
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0answers
52 views
Image Recognition Benchmarks
I was wondering if anyone knew anywhere I can obtain benchmark comparison of various algorithms used for similarity recognition. In my research I found one study from 2008 or so, but misplaced the ...
5
votes
1answer
279 views
Estimating attenuation using sliding windows
I am looking for an algorithm to measure attenuation of a discrete signal $s[t]$. Starting at the beginning of the signal sequence, is it possible to compute either sliding DFT or Gabor transform ...
2
votes
3answers
635 views
Speech Recognition - Project Idea
Wondering if someone could offer me any advice or help. Sorry if this question is too broad or anything.
I'm wanting to complete an algorithm in basic Speech analysis. The algorithm will detect ...
7
votes
4answers
360 views
Kalman filter - implementation and deciding parameters
First of all, this is the first time I try to make a Kalman filter.
I earlier posted this thread on stackoverflow which describes the background for this post. This is a typical sample of values I'm ...
8
votes
2answers
923 views
High quality reverb algorithm
I did a bit of searching on this site but surprisingly, I didn't find much relevant information, and my knowledge of DSP is very very limited.
My goal is quite simple : I want to program an ...
2
votes
1answer
103 views
Kernel convolution in frequency - weird “padding”
I don't know whether this is the right place to post this, but I suppose it is.
I know that frequency multiplication = circular convolution in time space for discrete signals (vectors).
I also know ...
11
votes
1answer
1k views
Inverse Short Time Fourier Transform algorithm described in words
I'm trying to conceptually understand what is happening when the forward and inverse Short Time Fourier Transforms (STFT) are applied to a discrete time-domain signal. I've found the classic paper by ...
6
votes
1answer
205 views
Determining how similar audio is to human speech
While looking for an answer to this problem, I found this board so decided to cross post this question of mine from Stack Overflow.
I am searching for a method of determining the similarity between ...
3
votes
1answer
100 views
How to remove color cast from HSV information
I have hue, saturation and value of a color (HSV color-space). The color has to be set on a device that displays them incorrectly. If I specify white it displays light magenta. However, if you specify ...
1
vote
0answers
109 views
Complex Demodulation (CDM) and Fixed Frequency Complex Demodulation (FFCDM)
I do not quite understand the difference between the CDM and FFCDM.
How can I implement CDM in a program?
5
votes
1answer
151 views
Help with algorithm for modulating oscillator pitch using LFO
I am developing a software emulation of an analog synthesizer. I am trying to modulate the pitch of an oscillator using an LFO. For each sample fed to the computer's sound system, I am calculating ...
6
votes
3answers
235 views
Anti-Filter in Image Processing?
Is there something like an anti-filter in image processing?
Say for instance, I am filtering an image using the following 13 tap symmetric filter:
{0, 0, 5, -6, -10, 37, 76, 37, -10, -6, 5, 0, 0} / ...
4
votes
4answers
105 views
How to measure a detector's performance under extremely complex real-world environment?
I am trying to formalize my understanding of how best to measure the performance of a binary detector. (See previous question here). I had looked into ROC curves for doing this however based on ...
1
vote
2answers
294 views
How to Filter Human Speech from an Audio clip?
I'm looking for an open source library to detect Human speech from an audio clip, such as a wav file.
