0
votes
0answers
3 views

Why doesn't JPEG use 1D DCT for image compression?

I know that JPEG uses 2D dct and splits the images in 8x8 blocks. Why doesn't it simply split the image in one-dimensional vectors in $\mathbb{R}^{64}$? Wouldn't it simplify the math? My guess is that ...
0
votes
1answer
4 views

Does anyone know how to overlay a equalized CDF plot with equalized histogram in matlab?

I am willing to overlay a equalized cdf with equalized histogram in matlab. But it's really hard to find any recommends. so if you can, would you please let me know about that?
1
vote
1answer
11 views

How does taking the absolute value of a complex signal reflect in the frequency domain?

I have a frequency-domain representation $F[n]$ of the complex discrete one-dimensional signal $x[n]$: $F=\mathcal{F}(x)$. Is there a frequency-domain transformation of $F$ into $F'=\mathcal{F}(|x|)$? ...
1
vote
0answers
14 views

Realization of IIR resonator

The measure of a given frequency $w$ in a signal $x(t)$ is: $\frac{1}{N}\sum\limits^N_{t=0}x\left(t\right)e^{^{-iwt}}$ This is basically an average of the correlation between the signal and a ...
0
votes
1answer
21 views

Find a sinusoidal fit from data with fft

I have a vector with raw data (120 samples). From the frequency spectrum I can tell there is one dominant frequency component. Now I am supposed to use the fft data (magnitude and phase) to find a ...
0
votes
0answers
13 views

Best way to resolve times of individual impulses with a gaussian response

I have a detector that registers a sequence of "hits" of varying magnitudes. Each of these hits will produce a signal that I am modeling for now as a gaussian of fixed width and amplitude ...
0
votes
2answers
36 views

Find the frequency response of the system

How can I find the frequency response of the following linear system
0
votes
1answer
27 views

Developing a classifier for a periodic music

I am trying to develop a classifier for Indian Taals, for which I would be focusing only on the Tabla. Now once a extract a period of the Tala(a repetitive pattern), I want to develop some feature ...
0
votes
1answer
49 views

Plotting DFT in dB

I'm having a little trouble plotting the DFT of a signal in dB. I can get the picture up nicely when using the magnitude but when I try converting the magnitude to decibels it all goes south. I've ...
0
votes
0answers
21 views

comparing statistical destributions and non-gaussian noise measeruments

I have some non Gaussian noise measurements and I want to find a statistical model that best represents those measurements. The statistical models that I used for comparison are Middleton Class A , ...
0
votes
2answers
51 views

Choosing the best measure for machine learning on a Spectrogram

I am working on an application to classify Talas(a piece of music with onsets). For that, I have the spectrogram of a Tala, which I want to compare with the test Tala, or compare 2 Talas. For this I ...
1
vote
1answer
55 views

How to extract IF (instantaneous frequency) from Discrete Hilbert Transform?

The continuous time Hilbert transform is $$\hat x(t) := x(t) + j\left( p.v. \left\{\frac{1}{t\pi} \ast x \right\} (t)\right)$$ where $$ \theta(t) = \tan^{-1}\left( \frac{ p.v. \left\{\frac{1}{t\pi} ...
0
votes
1answer
33 views

Call recognition using Digital Signal Processing

We are looking for writing applications which would recognize Bird calls and Frog calls using Sound processing. I have a background of iOS application development and C / C++ programming but have ...
0
votes
0answers
15 views

What does mean that to clipping the histogram value on adaptive histogram equalization? [on hold]

What does mean that to clipping the histogram value on adaptive histogram equalization? Does anyone know how to deal with clipping histogram on adaptive histogram?. Additionally, I would like to plot ...
0
votes
1answer
25 views

What does mean Histogram Equalization? [on hold]

Now, I am trying to study Histogram equalization and I refer to the wikipedia article here But I don't understand about $cdf_{min}$ value and $M$ and $N$. Why does $cdf_{min}$ value are decided on 1? ...
-1
votes
0answers
8 views

Dirty Paper Coding Precoding MU-MIMO BC Channel

I'm on my final paper work and I have a lot question to ask since I'm a newbie. so here it is, I'm working on Precoding Dirty paper coding MU-MIMO in broadcast channel with selective frequency fading. ...
0
votes
0answers
30 views

Transient cancellation in non causal filtering

I am using the exponential moving average filter (IIR): $$y(n)=\alpha{}\cdot{}x(n)+(1-\alpha{})y(n-1)$$ in a foward-backward filtering scheme, in order to eliminate completely any phase response ...
1
vote
0answers
38 views

Audio Recognition and Learning

I'm a beginner with absolutely no experience in signal processing, but it has been a long-term goal of mine to do something that mixes music (a hobby of mine) and computer science (my "expertise"). ...
0
votes
1answer
41 views

Separating 'signal' from periodic 'noise'

I have data in which the signal we want is a few gaussian peaks superposed on a noisy background in which some of the 'noise' is periodic. Simply suppressing the associated fourier modes is effective ...
0
votes
0answers
18 views

When does Nyquist criteria apply for signal analysis?

I have a transmitter that sends 128 samples/second to my laptop. I want to do a frequency domain analysis of such signal. Can someone remind me if I need to resample this already sampled signal at ...
0
votes
0answers
25 views

moving average filter vs up sampled low pass filter

I'm experimenting on different low pass filters in matlab. I've considered a vector x=[1 0 1 0] ; an up sampled low pass filter by a factor of two. And the frequency response turned out to be And in ...
0
votes
0answers
20 views

Is this expression true? [on hold]

Is this expression true? In Non fractional and Non radical systems,if condition of homogeneous is satisfied,the system is linear.
-1
votes
0answers
8 views

DS-BPSK UWB modulation

I'm trying to calculate the BER of DS-BPSK UWB modulation but I don't find references with accurate demonstration it's urgent please I need your helps and I'll be grateful. THX.
1
vote
0answers
41 views

Construct a correlation matrix using the covariance method

I want to compute the autocorrelation matrix by using the covarience method. X(n) is the harmonic process $X(n) = \sum\limits_{i=1}^3 A_i e^{jn\omega_i} + V(n)$ $V(n)$ is unit variance noise. $ ...
0
votes
1answer
19 views

OFDM violates sampling theorem

The "textbook" OFDM block diagram is as the below figure. But I wonder if it satisfies the sampling theorem. Here, we have N points $X[k]$ before IFFT, and ...
0
votes
0answers
26 views

DFT of a pressure signal from space domain to wavenumber domain

When I do the DFT of the following signal: I get the following DFT which doesn't capture any peaks at all: Why is this? I'm not really able to identify what the error is?
-1
votes
1answer
46 views

What does “real time” signal processing mean?

I thought this was supposed to be an obvious question, until I finally set up my real time system. So basically I have a transmitter that sends 128 samples/second to a receiver. The transmitted ...
0
votes
4answers
42 views

up sample and down sample

Let's say that I have a sampled signal x[n], it is being, in this exact order, up sampled by 2, down sampled by4, up sampled by 4 and down sampled by 2 to produce y[n]. It seems to me that it should ...
0
votes
2answers
32 views

What is the maximum data rate a wireless link can support using BPSK for given BER and SNR?

What is maximum data rate a wireless link can support using BPSK for 10^-6 BER, Bandwidth of channel is 200 kHz and SNR ...
0
votes
0answers
23 views

How to remove modulation frequency and its harmonics

I have amplitude modulated sound file signal and after demodulation using FFT I got fundamental frequency and its harmonics and of course noise. How to remove that fundamental modulation frequency ...
0
votes
1answer
35 views

Why use Wavelet Denosing instead of Band pass Filtering

What is the important advantage of adopting a wavelet based denosing scheme such as SURE, SUREshrink, etc. than using approaches involving low pass, high pass, band pass, band reject filter for signal ...
0
votes
1answer
43 views

Difference Equation & Impulse Response of IIR filter - deconvolution

What i want to do is to design an IIR-filter that cancels the "echo", such that im only left with the delta[n]. To do so i ofcourse make an IIR-filter, where u take the z-trans of the impulse ...
0
votes
0answers
16 views

Problem executing RIFFT in Cortex-M4

I'm implementing an Speech Recognition System over a Cortex-M4 processor (STM32F4-Discovery) and I'm facing a problem when a compute the RIFFT. I believe that I'm passing to the function the vector ...
0
votes
0answers
15 views

Does a Laplacian Pyramid and a Gaussian Pyramid use the same Kernel?

Does a Laplacian Pyramid and a Gaussian Pyramid use the same Kernel? I have to program this for an assignment, but it seems like the kernel used in both cases is a gaussian filter. Is that the case? ...
1
vote
0answers
30 views

Direct Form I Filter from Direct Form II

I am looking a way to make outputs match. For len 160 wouldnt the error be significant? For 40 ? I have included some sample output showing the error. Direct Form 2 Original ...
0
votes
0answers
16 views

Timing recovery for MSK?

I'm trying to implement timing recovery for MSK as outlined in "A digital approach to clock recovery in generalized minimum shift keying". The block diagram shows a loop: The nonlinearity function ...
1
vote
0answers
12 views

Selecting the number of cycles for wavelet transform

I'm trying some wavelet analysis of EEG signals, using the phase lock measures from [1], specifically the S-PLV measure. In order to calculate that we perform a wavelet transform on the signals and ...
-2
votes
0answers
21 views

Enhancement Of Ecg Signal [on hold]

Load, display and manipulating of ECG signals Design notch filters both in FIR and IIR for 50 Hz and 100 Hz respectively. Design a band pass filter to eliminate muscle noise. Plot the spectrum of ...
0
votes
2answers
48 views

Determine the time length of audio training samples?

Currently I am trying to use MFCC feature for audio training in order to do human voice classification (can later distinguish the person who speaks). I have problems to determine the proper time ...
-1
votes
0answers
11 views

Anyone know about 2D S transform [closed]

Please provide how to convert 4D to 2D S transform. Implementing 2D stransform
0
votes
2answers
35 views

How to organize MFCC features?

I have computed 12d-MFCC features on 3 consecutive audio frames, say: ...
1
vote
1answer
31 views

Spacing between gaussian windows for STFT

I'm computing discrete short time Fourier transform. Data is split into overlapping chunks and gaussian window is used for each chunk. However, I'm not sure how much overlap there should be between ...
0
votes
1answer
67 views

Strange Results from Biquad Peaking EQ Filter

I have a signal that I am filtering on an MCU (STM32F405) that I get from a codec (CS42L52). It is being sampled at a sampling frequency of 48kHz (actually between 48400 and 48600). I have a ping ...
1
vote
0answers
28 views

Laplacian Operator with and without diagonal direction

This is a general question on the laplacian operator, which has two different versions. The first version is : \begin{matrix} 0 & 1 & 0 \\ 1 & -4 & 1 \\ 0 & 1 & 0 ...
0
votes
0answers
17 views

What is the complex-envelope notation?

In reading a paper on demodulation there was this sentence: "Using complex-envelope notation, the noise corrupted waveform at the IF filter output can be written as...". I've not heard this ...
0
votes
2answers
49 views

FIR vs IIR filter

In my filter design, FIR gives order 14 and IIR gives order 8 or 4. so what are the disadvantages of IIR design?
0
votes
1answer
25 views

Why bother impluse invariance, bilinear transform?

Now that we can operate in the frequency domain by way of FFT. We can implement ideal lowpass, highpass and bandpass digital filters. then why there many textbooks talk about designing digital ...
0
votes
2answers
32 views

multiplications per second for FIR filter

In my filter the fs=300MHz. and no. of coefficients is 31. I have following queries. (1) what will be the number of multiplications per second? (2) can multiplication be done in one clock cycle? (3) ...
0
votes
2answers
39 views

Frequency Response Output

I'll start off by saying, yes this is a homework problem, and no I do not want the answer. I simply need to know where to start. The input to a system with a frequency response of $H(\omega)$ is ...
0
votes
1answer
35 views

A filter in IOS to eliminate a certain frequency range

I am making an application where I record sound on an IOS device using the built-in microphone. I want to process the sound in such a way that only frequencies in the 16-18 kHz range remain; the other ...

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