# Tagged Questions

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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 ...
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: ...
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 ...
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 ...
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? ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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, ...
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 ...
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.
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 ...
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 ...
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 ...
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 ...
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