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1
vote
1answer
66 views
How to calculate auto-correlation of a bpsk modulated signal or how to calculate expectation value of complex exponential function
How to calculate auto-correlation of a bpsk modulated signal or how to calculate expectation value of complex exponential function manually not by using matlab or any other software? for example, if
...
2
votes
1answer
57 views
How to distinguish between the different frequency domains?
Sometimes the terms 'Fourier domain', 'complex frequency domain', 'Frequency domain' and 's domain' are used interchangeably.
Take those answers here for example: ...
0
votes
1answer
27 views
How can I graph a simulation of a FM 16 bits codification?
I have to develop a software where the user inputs a 16 bits binary sequence, which is supposed to be the codification of a FM (or even AM) signal, then I should graph it according to Frequence / Time ...
2
votes
1answer
65 views
Locking on to a square wave signal with minimum oversampling
I'm designing a device that will have an IR photodiode connected to a low power microcontroller's ADC pin. At times, another device will be transmitting a 48KHz square wave, and I'd like to be able to ...
3
votes
2answers
63 views
Linear model of the modified error function
We can write the error function ($E(w)=1/2\sum_{n=1}^{N}\{y(x_n,w)-t_n\}^2$) as a linear model using its partial derivatives. Is it possible to do the same thing about the modified error function?
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4
votes
2answers
405 views
How to find poles of transfer function by looking at the step response?
How to find poles of transfer function by looking at the step response?
Given a step response graph like such:
How would I find the sketch for its poles on the complex plane? The only thing I can ...
2
votes
1answer
62 views
Clarifying some notation in Bishop book
In Bishop book, page 4, section 1.1, there's a notation I don't seem to understand what's meant by it. The whole paragraph, with which the section begins, is:
We begin by introducing a simple ...
0
votes
1answer
104 views
How do I implement IFFT to filter low frequencies from a group,after Freq detection by FFT?
I use a combination of Visual Basic Programming interfaced with FAMOS which is a DSP software like MATLAB but much easier.I am trying to separate signals from a group,which requires filtering each ...
0
votes
1answer
114 views
Is possible to get overshoot on bessel filter?
I tried to use bessel filter from http://www-users.cs.york.ac.uk/~fisher/mkfilter/trad.html,
but in case large dataset i have overshoot
as i know bessel filter shouldnt have overshoot, so is code ...
2
votes
2answers
73 views
Resampling necessary?
I have a file that is composed of n data records with a sample rate s. Each of these records has a duration d. Now due to postprocessing I have to change the duration to d=d/3 thus afterwards I'll ...
4
votes
1answer
115 views
basic bandpass filter
I am attempting to implement a basic bandpass filter but the center frequency of my filter seems to be irrelevant as I can change it all I want but it has no effect on the filter.
where am I going ...
2
votes
3answers
761 views
Optimized Ansi C libraries for DSP
I am new to DSP? Where is a good resource for open source DSP algorithms?
MATLAB is great at making protos but once we move to C coding, it takes time and we end up making too many mistakes. I would ...
4
votes
1answer
208 views
Why does diagonal loading of a covariance matrix make an adaptive beamformer more robust in the case of a perturbed array?
It has been shown that 'diagonal loading' a covariance matrix derived for an adaptive beamformer can improve robustness of the beamformer when the antenna array is perturbed, albeit at the expense of ...
4
votes
2answers
329 views
Magnitude of Power Spectral Density with Different Sampling Frequency
For exponential signals (sine or cosine), if the sampling frequency $f_s$ is equal to the length of signal, $N$, the magnitude of psd for each sine signal is proportional to amplitude in time domain, ...
3
votes
1answer
436 views
How to avoid denormalized numbers?
The same floating-point AMD X86-64 digital signal processing system mentioned in my previous question has a problem where it sometimes slows down substantially when signals attain values very near ...
6
votes
2answers
130 views
What are less computationally demanding alternatives to the Viterbi Decoder?
What are less computationally demanding alternatives to the Viterbi Decoder?
Ideally what I would like is a list of the most commonly used approximate methods, along with brief pros and cons.
15
votes
4answers
860 views
How do I extrapolate a 1D signal?
I have a signal of some length, say 1000 samples. I would like to extend this signal to 5000 samples, sampled at the same rate as the original (i.e., I want to predict what the signal would be if I ...
9
votes
1answer
363 views
How does adaptive Huffman coding work?
Huffman coding is a widely used method of entropy coding used for data compression. It assumes that we have complete knowledge of a signal's statistics. However, there are versions of Huffman coding ...
15
votes
1answer
351 views
What approximation techniques exist for the square super-root function?
I need to implement an approximation to the inverse of $x^x$, i.e. the square super-root (ssrt) function. For example, $\mathrm{ssrt}(2) \approx 1.56$ means that $1.56^{1.56} \approx 2$. I'm not as ...
7
votes
3answers
524 views
How to check the FFT results of a sine wave?
I have been given an audio file (sine wave) 1000Hz as an input to my FFT algorithm.
I have got 8192 power spectrum samples in a array.
What is the best and easiest way to check whether my output is ...
