# All Questions

16,607 questions
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### Why do we need to write the noise as randn(2,1)./sqrt(2*SNR) instead of randn(1,1)/sqrt(2)?

I saw this code, about the error probability of on/off signal ,on the internet ...
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### Spectrogram of chirp sequence radar signals

I am confused as to whether SFFT makes sense to process chirp sequence signals. The radar fires up a sequence of 100 linear ramps with that are only interrupted by the very short period in which the ...
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### FIR band pass filter desiging using PSO technique

Can anyone help me in writing matlab code for optimization of filter coefficient of FIR band pass filter using PSO algorithm?
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### What is a good book/tutorial that explains Viterbi decoder for convolutional codes?

I want to write my own code in MATLAB for Viterbi algorithm to implement a digital communication system in which BPSK is used along with channel coding (or FEC). The conventional books/tutorials ...
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### Frequency scale in fft after zero filling (odd/even number of data)

If we have a spectroscopic data which consists of time versus light absorbance "A".There is another set of control data "B". Both data are sampled at the same rate ${Fs}$. The two sets are to be ...
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### Demodulation using orthogonal signaling

I am a beginner and I want to implement a demodulate function that takes in a signal (the received waveform), the number of bits per chunk k, and the length T in seconds of each signal (which is also ...
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### Orthogonal Signal Modulation

I am a beginner and I want to implement a modulate function which takes the bitstring (the data), the number of bits per chunk k, and the length T in seconds of each signal (which is also the ...
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### Understanding performance of Lucas Kanade Iterative Image Registration Technique

I am reading the paper: Lucas, B. D., & Kanade, T. (1981). An iterative image registration technique with an application to stereo vision. I am having some trouble understanding section 4.3 ...
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### Does a phase rotation introduce a delay?

Suppose I have 2 complex time series, $x_1$ and $x_2$. If I measure the delay between $x_1$ and $x_2$, I get $t$. If I make $x_2 = x_2 e^{-j 2 \pi 10}$, and measure the delay between $x_1$ and $x_2$...
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### Looking to simulate sound level meter (read microphone audio signal into 1/3 octave)

I am looking to pull audio from a microphone and analyse the 1/3 octave data. Can anyone suggest a software library to do this that I could then build a software interface on top of? Initially looking ...
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### Comparisons of FIR Causal filters of type HRIR in Discrete Time and Frequency Domains

I have just implemented a Discrete Time Convolution between HRIR filter at a range of angles. I also implemented an Overlalp-and-Add method and FFT and IFFT to compute the same convolution in ...
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### How to achieve a smoothed frequency phase response with no outliers

I have two sampled signals, which I then perform wavelet analysis on, by synthesising the Filterbank, perform the dft on each kernel, and the dft on the sampled signals, and multiply together. ...