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Suppose a complex $(N \times N)$ matrix $\mathbf{T}$, multiplying a complex vector $\mathbf{x}$ with length $N$.
On a given application that I'm studying, which is irrelevant for this discussion, I can get the same results of $\mathbf{Tx}$ by the following operation:
\begin{align}
\mathbf{W_1} \Re\{ \mathbf{y} \} + \ma... |
I've always thought that image convolution is a weighted sum of the nearby pixels using the convolution kernel as weights. But from the description on Wikipedia, this is what cross correlation does. Convolution seems to be equivalent to 1) reversing the convolution kernel 2) doing cross correlation with this reversed k... |
I have derived the Yule-Walker equation as shown below.
\begin{align}
\hat s(n) &= -\sum_{k=1} ^ p a_k s(n-k)\\
e(n) &= s(n) - \hat s(n) = s(n) + \sum_{k=1}^pa_k s(n-k)
\end{align}
In order to minimize the power of the error: $\displaystyle
\frac{\partial E\left[\lvert e(n)\rvert^2\right]}{\partial{a_k}} = 0 \quad \te... |
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 purposes. in case of failure of one computer, other computer can handle the total processing job perfectly.
My question i... |
So it recently dawned on me that Bessel filters, despite being listed along with the other common types, are really an oddball that belongs in a different "class", and I'm trying to learn more about it.
The rectangular magnitude response represents the ideal frequency domain response, for the transition band is zero a... |
I am working in digital image restoration field. I have read all things about convolution, that, for an LTI system, if we know its impulse response, then we can find its output by just using convolution between input and impulse response.
Can anyone tell me that what is the main mathematical philosophy behind it? Your... |
What I have:
A digital signal sampled at Fs composed of a QPSK modulation at Fmod plus some additive white gaussian noise.
What I want:
$$ modPower/signalPower $$
The idea behind is that I want to detect if there is a communication at Fmod on the channel or if there's just noise.
What I do:
Over the observation w... |
I am using an accelerometer to record the motion of a shake table (a rocking table) which moves forward and backward in one direction. The signal is very noisy and decided to use Extended Kalman Filter. What equation should i use for the model?
|
I have a list of collected data points that I need to take a DFT of, however with the problem that about one quarter of the data points in the middle are missing, and so even though the existing data points are evenly spaced their is still a large time gap that needs to be accounted for. I looked up some things on a va... |
I need to calculate BER (bit error rate) for a system using spreading spectrum DS over ultra wideband (UWB). Modulation is bpsk. The spreading sequence lengths are not equal for all users. Receiver is matched filter. I know the equations of DS-UWB transmission signal and template signal which I should use at receiver t... |
Before I start my question, I should probably mention that this question might not be the right question to ask here, but I tried academiabeta, and stackoverflow, but without getting any to-the-point responses. I also noticed that there were some questions of similar interest asked here, but mine is little different an... |
My idea is to find a word in wav/mp3 files. It is just one word.
I have a database with a few hundred songs.
I am looking for pattern matching (this is not an exact pattern) it can be an word i choose but only one.
Can you recommend a pre-processing algorithm. you run the algorithm on the files?
Can you recommend a re... |
I have a wave file whose frequency spectrum looks like this.
It contains audio, which I want to keep while removing the rest. The problem is that the surround noise changes, just those distinct voice patterns remain. I marked the voice patterns for clarity:
What could an algorithm look like / a workflow in adobe aud... |
For a multivariate time series
$$\underline{y}(t)=[y_1(t) \dots y_n(t)]^T$$
What is the difference between the components $y_i(t)$ being spatially independent and instantaneously independent?
|
The Rician factor is the ratio between the mean power of the LOS path to the mean power of all other (non-LOS) paths. Increasing/decreasing this factor means increasing/decreasing the mean power of the LOS path. Does increasing the Rician factor improve or degrade transmission quality?
|
I am currently working on an audio watermarking project in MATLAB. I currently have a code I am using to construct a nxn 3 Band Wavelet Transform matrix. However, when I try to construct a matrix that is larger in size, I get the error "Maximum variable size allowed by the program is exceeded" or "Out of Memory."
There... |
Question
I've been attempting to resample a GPS signal in MATLAB. I've built a few FIR filters using fvatool and from handmade transfer functions (punched out with a HP-35s). Most are kaiser-windowed LPFs, but some are least-squared LPFs. All of the filters I've built have nominal responses that should adequately filte... |
I'm trying to demodulate a QPSK communication.
For the moment I do:
Signal detection by computing the ratio between the power of the carrier wave compared to the signal power.
Initial clock synchronization with a preamble.
Initial phase recovery with the same preamble.
This works great with my signal but now I want... |
I've been driving myself absolutely crazy trying to do autocorrelation analysis on some data that I've got. I've read from multiple sources that the ACF of a random telegraph signal / random telegraph noise is given by an exponentially decaying function where the decay constant is the average rate of switching between... |
I am looking for ANY advice anyone can give me regarding on this problem.
I'm looking to start a project on subtitles, basically, if we take a Youtube video of a breaking news story, subtitles are generated automatically without the need of physically inputting what the speaker is saying. Now, I understand the complexi... |
I'm trying to filter some motion noise from an ECG signal. To do that I'll try to implement an adaptive filter using the LMS algorithm.
I think I have to calculate the MSE of this:
E[e^2 ] = E[(s + n )^2 ]+ 2E[(s + n)X ]W^T + WE[X^T X ]W^T
in which s+n is the noised ECG,
X (n) = [ 1, Accx (n), Accy (n), Accz (n)] are t... |
I'm going to have to give a bit of context for this question to make sense.
I am working on a project which includes audio source localisation in 3-D space through TDoA (Time Difference of Arrival - from here called $\tau_{ij}$, between sensor $i$ and $j$) measurements. In other words I have $m$ sensors that each have... |
Just starting research in audio watermarking and have read many papers regarding audio watermarking but I am still a little confused on what exactly gets embedded into the signal. For example, one paper I read embedded an image or written signature into the audio.
My question is what typically gets embedded in the sig... |
I have 2 audio .wav files recorded by the the same person with the same word. Each audio file has a format of 16bit, 44.1kHz and is a mono channel. I would like to know how to compare these 2 audio files if it is by the same person. What I know is to process the files to produce a floating point result of values betwee... |
How get cross-correlation peak and based on it calculate correlation score for similarity of two audio samples. SO far I've
FFT two samples
complex conjugate second
multiply results
IFFT
cross-correlate with itself(autocorrelate)
Thanks for any advice
|
I have to find a convolution of two signals
$h[n] = 0.5^nu[n]$
$x[n] = u[n]-u[n-3]$
the final sum, which is correct is:
$$\sum_{m=n-2}^n 0.5^mu[m] $$
note that i replaced n-k with m, that is
$ m = n-k $
So, in regards to parameter n, i have to decypher the formula.
The result is:
$$0, n<0$$
$$2(1-0.5^n*0.5), 0\le n \lt... |
I currently have a 16bit mono file. I would like to read this data to retrieve only the data chunk part and not the entire file with the headers so that I can apply fft on it. I tried finding solutions to read only the data chunk but the codes I managed to find were either not complete / seems to have errors. I am doin... |
I am using wavread in MATLAB, which outputs the data in a .wav file in double precision. I am wondering how this relates to binary, such as 0's and 1's. Thank you!
|
It's my first attempt at 3D analysis.
I am trying to segment a 3D CT data.
My case study is very simple: trying to segment circular objects in my data.
Do you have any suggestions on how to achieve the 3 steps:
1. First of all I would like to visualize my data in 3D
2. Then segment by value, e.g. all voxels whose value... |
I have a task from my boss on calculating Ballistocardiogram (BCG) with Photoplethysmogram (PPG) using MATLAB. I would like to know how it can be done. Any kind soul can guide me?
As for what I know about how the test will be like is that I will need to take the BCG data and compare it against the PPG (I know Matlab ha... |
Using the figure below as an example, I wonder if it is possible that the small oscillations in the signal at the time of each step shift could be caused solely by the application of a low-pass filter to a pure square wave?
|
I am wondering if there is a formula for the period of the sum of $N$ cisoids of the form $e^{j\frac{2\pi}{N} i\, \omega_k}$ where the frequencies $\omega_k \in \left[-N/2,N/2\right]$, $k=0,\ldots,N-1$ and $\forall\, p,q,\, \omega_p \neq \omega_q$. This kernel arises, for instance, in the expression of the Non Uniform ... |
I am trying to find a specific block of data that should hold valid audio data that I want to process. For instance, I record at 44.1kHz, but I only transmit a .5s of content. Since the buffer I store the recordings in contains both the recording as well as background noise, is there a way to isolate the sample I desir... |
I'm trying to write a correlation function on an embedded device. Because its embedded, I need to make sure that the memory/CPU usage is minimum.
Here's the deal:
- I have a saved waveform sampled at 1 MHz
- I have timing info for the waveform
- I am going to be taking a new waveform at 200 kHz with new timing info
-... |
How to compute Image gradients?
In X Direction - Kernel : -1 0 1
In Y Direction - Kernel :
-1
0
1
Let's assume my input image is: unsigned char* imgImage;
Could any one please share code. I am newbie to image processing.
Is it possible to do in OpenCV with this same kernel?
Thanks a lot in advance!
|
I'm trying to figure out how to implement a continuous EQ filter. I have in the past built a parametric EQ and then built a 10 channel EQ using 10 of these parametric filters. This gave nice results.
However I'm now trying to create a continuous EQ filter. Is this possible with a parametric EQ? By selecting the Q f... |
Okay, this might be a very basic question, but I'm completely new to the field.
I have a $40$ Hz sine wave ($1000$ samples, $fs = 1$ kHz), which I have amplitude modulated to a $4$ Hz sine wave ($1000$ samples, $fs = 1$ kHz). In the time-domain, the result looks like I expected. However, when I calculate the FFT, there... |
Everybody explains that white noise has all frequencies equally strong. But, this immediately means that
Ultraviolet catastrofe inevitably happens if power > 0 stays constant at any frequency and, what is similarly unacceptable,
White noise is identical to single Dirac impulse since delta pulse is a constant in the F... |
I see the following expression from http://en.wikipedia.org/wiki/Scale-invariant_feature_transform
The quadratic Taylor expansion of the Difference-of-Gaussian scale-space function, with the candidate keypoint as the origin is
$$D(\textbf{x}) = D + \frac{\partial D^T}{\partial \textbf{x}}\textbf{x} + \frac{1}{2}\textb... |
A bit of background information:
I plan to start experimenting with digital signal processing on microcontrollers. The particular microcontroller I plan to use (TI Stellaris LM4F230H5QR, from the Stellaris Launchpad) has a 12 bit ADC integrated on it, while on the other hand, all DACs I that look like possible candidat... |
I'm doing research on how we can do matching between 2 audio files using Android to see if they have the same content or not. After doing lots of research, I have concluded that I must do 2 main things:
FFT
Correlation
Am I on the right track?
|
I have a file which is a recorded voice of a single word. The format of this audio file for me is unknown. Could you help me to decode or figure out how it is compressed?
I was trying to open it as a PCM (8/16 bits), VOX, uLaw, aLaw, but it does not work.. all I can hear is a loud noise.
Audio file example is at:
http... |
Is it possible to compare two audio samples(meaning find word from one in another) realtime with cross-correlation?
|
I am reading several papers applying anisotropic diffusion in the transform domain like Shearlet, curvelet. All of them have got excellent results.
The physical meaning and principle of applying anisotropic diffusion in space domain is quiet straightforward -- the gradient.
I am confused as to the physical meaning and... |
Let's say I have two images that are parts of the same bigger image, cut using two masks (for simplicity, let's assume that the masks are just rectangles of the same size). The images are presumed to overlap. The concrete examples are: image stabilization (two different views of the same background) and object tracking... |
Update
This question is purely theoretical and should not account for any psychoacoustic effects, or practical implementations.
Perhaps the question should be rephrased to "How long will it take to apply the smoothest possible fade, in a single precision system"?
A sine wave is generated within a 32-bit float system... |
I have a device with an accelerometer and I want to make it as precise as possible (using algorithms). Currently no DSP algorithm is running - I am reading values as they are. I've made 3 tests - in each I rotated the device around one of the axes and recorded the values coming out from accelerometer. It would be perfe... |
i have a problem in ofdm modulation .... there is a stream of bits that is converted from serial to parallel and is applied to an IFFT block. based on the definition of IFFT the output should be an complex valued number. how does it represent the real and imaginary parts in the digital domain( bits 0,1) ?
|
I have a set of songs for which I extracted the magnitude spectrogram using a Hamming Window with 50% overlap. After extracting the spectrogram, I did some dimensionality reduction using Principal Components Analysis (PCA). After reducing it to lower dimensionality, I reconstructed the spectrograms from lower dimension... |
I'm trying to reproduce this !!!WARNING LOUDNESS!!! sound in C. In the website, it says to use Carrier: 500 Hz, modulator frequency: 1 Hz, modulator index: 500, however I'm getting lots of clicks and fuzzing (along with the right sound) with this code:
#include <stdio.h>
#include <math.h>
#include <string.h>
#define D... |
Say you want to compute the least squares estimate of $w$ from a data-set:
$$
\begin{bmatrix}d_1 \\d_2 \\\vdots\\d_N \end{bmatrix} =\begin{bmatrix} x_1 \\x_2 \\ \vdots \\x_N\end{bmatrix}w + \begin{bmatrix} q_1 \\q_2 \\ \vdots \\q_N\end{bmatrix}
$$
Note: $q$ is white noise.
This can be compactly written as
$$
\mathbf{... |
I have an irregular shaped 3D image that I want to do frequency domain filtering on. Currently I simply zero-pad the data to make it a cube, then do an fft.
I was wondering if this was a valid approach and what effects this may have. Are there any alternate (better ways) to do this, and if so could you point me in the... |
during Zimmerman trial, each camp claimed the yell for help recorded belonged to their side. given that Zimmerman is still aside and the recording still exist, could there be some scientific way to tell which way?
|
Savitzky-Golay smoothing filters of polynomial degrees 4 and 6
have frequency response with ripples of roughly opposite signs.
Thus averaging the coefficients of two filters of degrees d and d+2
is an easy way to attenuate the stopband:
Can anyone explain the roughly opposite ripples —
or are they just a lucky coincid... |
I have three orthogonal accelerometers that give accelerations in x,y and z dimensions. I'm trying to detect directional vibrations between certain frequencies.
In other words, my input is 3d vector and I would like detect signal coming from unknown direction, filter out noise from other directions and turn the signal ... |
Hello I am trying to computer the Complex Cepstral Transform of an audio signal. I am using wavread to get an array of data type double precision. However, when I try to use cceps to do the Complex Cepstral Transform, I get the following error:
Error using cceps>chkinput (line 157)
The input signal X must be real.
Er... |
I'm looking for literature or other information that covers iteratively estimating the auto- and cross-correlation vectors and the auto-correlation matrix.
Initially, I can assume the signal is wide-sense stationary, but I also have to deal with changing signals and statistics.
For what it's worth, I looked at two sim... |
Hello I am working on audio watermarking in MATLAB and am trying to choose specific frames of the audio signal where the watermark will be embedded. Through research, I have read that the best way to do this is to choose parts/samples of the audio signal that are the loudest, or above a certain threshold. By using wavr... |
After calculating the principal component analysis (PCA) of a given data set, we are normally left with a matrix containing the eigenvectors sorted in order of the size of the eigenvalues. Now, in pattern recognition which eigenvector should we choose: the first eigenvector or do we have to do further processing of the... |
I'm analyzing speech signal for identifying voiced and unvoiced regions. Voiced regions are supposed to have a "pitch", which can be estimated using auto-correlation function (ACF). Basically, one estimates ACF for each frame of speech (say 20ms) and then finds the time lag between peaks in ACF output. If all the signi... |
I have gigabytes worth of seismic ground data, that I wish to upsample by a factor of 2 or 3. I wanted to ask what efficient way might there be for me to upsample such a big file? Is there a way to break it down and do it in mini-files? (I am using MATLAB for my software, I think the resample command might take too lon... |
I am not sure if this question suits this site, but I want to convert humming into notes or relative values to analyse melodies, word of "Signal Processing" looks suit for this. I am planning to use Flash AS3, and Tortoise and Hare for Cycle Detection. I need very simple script implementation. All I want is find notes ... |
I am currently frequency filtering a 3D image in matlab, with x,y,z dimensions of different lengths. The matlab filter takes normalised frequency as an argument. What does this mean for an image and how do I calculate it?
Note : the distance between each pixel is 2mm
|
I was reading a couple of these threads and I was wondering:
Is it possible for an FFT signal to include frequencies less than $1/N$?
Consider a time-series of length $N$, and I perform an FFT on it. In the zero-th bin of the FFT is the DC signal, and first bin is frequency $1/N$, in the second bin is frequency $2/N$ ... |
Hi: I'm new to this list but I had a question that's not exactly related to dsp but maybe in a slight way and I didn't know where else to send it. So, here goes and my apologies if this is totally the wrong place to send it.
The following describes the background as far as number generation.
Suppose have a series of ... |
I have an application that displays several signals from different sensors at various sample rates. In order to display the data, I "stretch" the signal by repeating samples to match the highest sample rate. For example: if I display a 500 Hz signal and a 100 Hz signal at the same time, every sample in the 100 Hz sig... |
I am reading a paper on SIFT by Lowe.
In it, gradient magnitudes and orientations are calculated using these formulae:
$$$$
I don't know why m(x,y) is calculated above. I heard that gradient magnitude is usually calculated like the following.
$$\sqrt{f_x ^2 + f_y^2}
$$
|
i want to design a filter that can effectively detect the QRS complex in ECG signal(whose Fs=360Hz) and reduce high frequency noise components. i want to know as to how the center frequency is detected so as to design a digital lowpass differentiator filter with bandwidth equal to the center frequency of the QRS comple... |
Suppose I have some amplitude modulated carrier wave $x$. If I have no access to the original message wave nor the unmodulated carrier, is it some how possible to calculate what is the modulation depth of $x$?
If I have understood this correctly, amplitude modulation depth is given by
$M/A$, where $M$ is peak amplitude... |
This is the first time that I post a question here so excuse me for asking such a beginner question.
what free open source 3rd party libraries which have good documentation(because I'm new to using 3rd party libraries) would you suggest me for fourier transform,inverse fourier transform , meshgrids , dynamic arrays an... |
I am trying to transfer text data via sound wave between two android phones. I am a newbie and would like to know how to proceed with it. I am stuck at the very first step on how to modulate text data as FSK or PCM raw data ? As I shall be implementing it on Android any Java pointers will be of great help
|
The best standard may be varying from PSNR to human's visual feeling. Any one is OK.
I have tested J.Weickert's tensor diffusion and P&M's, they all can't satisfy me.
Is there any anisotropic diffusion method now is best for denoising, especially in tensor diffusion, others like the KAD, MAD and so on is ok as well.
Th... |
Is a radix-4 implementation faster than a equivalently well coded radix-2 FFT? And if so, why would it be faster?
|
Question:
I want to kick up a discussion on how people set algorithmic parameters when no validation against groundtruth is possible (maybe because groundtruth just cannot be obtained or is very hard/tedious to obtain).
I have read numerous papers and implemented the underlying algorithms wherein --- a set of paramete... |
I'm trying to implement a QPSK burst modulation and demodulation through a channel and I'm now considering the synchronization part.
I've read that Barker sequence were excellent option for this as their autocorellation looks like a dirac.
So far I know that they're composed of 1 and -1 and that the longest found is 13... |
I just have a quick question. I'm a second year computer science major with a background in C# and C++. I'm interested in studying neuroscience after graduation, and I've been researching some subjects on my own in my free time. I'm thinking of purchasing a Neurobit Optima 4 and writing some applications for it (specif... |
I want to check the effect of this channel model on my signal transmitted with "impulse response-Ultra Wide Band" transmission (use very short pulses ~0.5 ns each), but i don't know where to find this channel impulse response or how can I generate it?
if there is only one line of sight (LOS) path and one non-line of si... |
For this question purposes a function, $ f \left( t \right) $ is said to hold the Partition of Unity if:
$$ \forall t, \ \sum_{n \in \mathbb{Z}} f \left ( t - n \right ) = 1 $$
Using the Poisson Summation Formula the Partition of Unity is equivalent of $ F \left( 2 \pi k \right ) = \delta \left ( k \right ) $ where $ F... |
I need to compare FFT result from audio files,
I have 2 FFT result from 2 audio files..
FFT 1 (sample)
-0.16314493488504767 - 0.103707391105263i
0.07863935536550609 - 0.30111206509352917i
0.06753127619272284 + 0.02837438103569126i
FFT 2 (sample)
-0.006953384463464084 + 0.0291883094944081i
-0.09447919915711694 - 0.2267... |
I'm decoding a pulse amplitude modulation encoded digital signal. The goal is to detect the individual pulse against a background noise floor. The amplitude of the pulses varies depending on the signal strength and quality.
My sampling rate is 2x the bit width such that one bit fits into sample. Thus a single bit is th... |
I'm having a lot of problems with my project:
I added salt and pepper noise by inbuilt function
I DWT function with Haar family
Now I want to remove noise from original speech signal.
I don't know how to do this
|
I need to design a moving average filter that has a cut-off frequency of 7.8 Hz. I have used moving average filters before, but as far as I'm aware, the only parameter that can be fed in is the number of points to be averaged... How can this relate to a cut-off frequency?
The inverse of 7.8 Hz is ~130 ms, and I'm worki... |
Given a frequency response obtained with FFT, I would like to apply a 1/n octave smoothing. What filter should I be using and how? Maybe someone could point to a good reference (a paper or book on the subject).
|
White noise has infinite variance, whereas Gaussian random variable must have some finite-variance to exist. How do two disjoint phenomena co-exist?
Help will be highly appreciated.
|
I'm looking for a way to visually inspect the amplitude of frequency components in a 3D image that I have taken the fftn of in matlab. Does anyone have any idea how to go about this?
|
I am doing research in audio watermarking and have come across the paper that uses the complex transform to embed the watermark in order to improve the robustness and inaudibility of the embedded watermarks.
This is done by embedding the watermark into the complex cepstral components of the audio coefficients transform... |
I realize that this might not be the most well-formulated question, but I figured I'd throw it out there as an open-ended discussion that could turn up some interesting input.
I'm relatively new to speech processing, and came across the statement "invariance to transformation is important in many speech engineering tas... |
I've been studying sift very hard for two weeks.
I found much materials about scale space.
It is very hard to understand scale space depthly.
What I've found and confusing things are that
'scale' in scale space means the sigma of gaussian function.
'octave' is used to represent images that are reduced.
In paper by Lowe... |
I'm trying to implement a speaker recognition system and want to make sure I'm aware of the latest trends in speech segmentation. I've read a number of very different methods at a higher level but I'm not sure which one would be best for my particular situation. I'll list what I found so far and I'd appreciate either (... |
I am new learner in the field of speech analysis. I am wondering there are so many resources which explaiins principles of speech recognition. Most of them are advanced topics. I am curious to know the methods behind the speech recognition. If any one can explain it or if any one have easy helpful resource expaining it... |
I presume we are all here well aware about foldback aliasing when sampling signals above the Nyquist frequency; i.e. half the sampling rate.
By contrast, the phenomenon of beating occurs when sampling a signal with a frequency slightly below the Nyquist frequency. You can see and hear some beats on this educational sit... |
The following image is from robert collins' ppt from http://www.cse.psu.edu/~rcollins/CSE486/
How to calculate sigma ?
It shows [1 4 6 4 1] is corresponding to sigma=1.
I learned that usually 3*sigma is best to represent. So kernel size is 7*7 is suited. But its size is 5*5.
I don't know why [1 4 6 4 1] is matched to s... |
I am working on Pedestrian dead Reckoning using Particle filtering. I am using mobile accelerometer sensor to detect number of steps and stride length and calculating the total distance traveled.
I want to use particle filter to enhance accuracy in my results. I have read the theory of particle filter but stuck at the ... |
I'm reading Schaum's DSP book, and in Fig 1-3 they demonstrate why shifting and reversal are order-dependent, showing a couple of simple systems, 1) delay followed by reversal, and 2) reversal followed by delay.
The equations they present as follows:
1) (Time delay -> Reversal)
$x(n) \rightarrow x(n-n_0) \rightarrow ... |
When we apply pulse-width modulation (PWM) on controlling the brightness of a LED or the speed of a DC motor, is it the lag in our eyes that is responsible for the feeling of a continuous powering or the inertia of the devices?
|
i will use matlab code just for convenience, i get the same behavior using a C++ code.
I have two signals:
Fp=5;
A=0.00025;
Phi=0;
Off=0.5;
KADC_5VOLT=5.0/32768.0;
tc=250e-6;
tmax=30;
t=0:tc:tmax;
Buf1= int32 ((A*cos(2.0*pi*t*Fp+ Phi*pi/180.0)+Off)/(KADC_5VOLT));
Buf2= int32 ((A*cos(2.0*pi*t*Fp+ Phi*pi/180.0)+0)/(KA... |
I'm a little confused on how frame based high dimensional features such as mfcc's and bfcc's are applied in the classification of musical instruments.
Are statistical measures of the features used e.g. using the standard deviation across the frames used as a feature? Or is each frame of coefficients used as independent... |
Does the following code properly implement a phase-neutral band-pass filter using SciPy?
freq_fraction = FREQ / (SAMPLE_RATE/2)
sharpness = 0.1
filter_length=128
fir = sig.firwin(filter_length, [freq_fraction*(1-sharpness),freq_fraction*(1+sharpness)], pass_zero=False )
filtered = sig.lfilter( fir, 1, data_to_filter ... |
I have to calculate the magnitude-squared coherence (MSC) between two signal. However, using a routine that uses only one taper (or no tapers at all) my result is always 1, despite the signals are clearly different. This doesn't happen if I use more than one taper. Searching a explication for this abnormal result, I co... |
making pink noise (1/f) using list of frequencies
I would like to see what type of noise I would get if I used just the frequency in my voice. I created a matlab array using fft to get the
[frequency,amplitude,phase] to reproduce my vocal signal.
I would like to take this file/data and use it to create pink noise (1/f... |
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