John Bofarull
  • Member for 3 years, 7 months
  • Last seen more than 3 years ago
  • London, UK
Clean noise in neural data - MATLAB
2 votes

Following, a way to remove the 3 exponential pulses. 1.- Rebuilding signal + interferer from graph provided clear all;clc;close all A=imread('001.jpg'); A1=A(:,:,1); figure(1);imshow(A1) A2=~...

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how to detect two parallel lines in a binary image with MATLAB
2 votes

this is John BG jgb2012@sky.com 1.- Avoid doubling segments If you carry on with the code you have used in your approach: img=imread('001.jpg'); imshow(img); img = rgb2gray(img); img = medfilt2(...

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Finding the edge pixels on only one side of the object
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1 votes

I found a way to detect the right hand side edge with MATLAB: 1.- acquiring image A=imread('001.jpg'); figure(1);imshow(A) A1=A(:,:,1); [sz1 sz2]=size(A1) figure(2);[P,h1]=imcontour(A1,1); this ...

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why transmitting a long pulse its spectrum gets spread?
1 votes

this is John BG 1.- GFSK is not same as single tone According to the CC1101 specs you refer to, the C1101 uses GFSK. GFSK varies the varrier frequency, therefore the spectrum cannot be a delta. ...

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Mixed time/frequency domain data
1 votes

this is John BG 1.- You have to work with Signal Power, not just input or output: Circuit resonance is measured with the quality factor Q and does not only have to do with the signal you send in, or ...

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Circle detection with incomplete edges
1 votes

this is John BG. Found a way to detect the traffic signal circle avoiding imfindcircles that requires the guessing of its parameter Sensitivity. 1.- Acquiring image clear all;clc;close all A=imread(...

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Does the number of samples matter for FFT, and how to get a specific frequency visible?
1 votes

this is John BG jgb2012@sky.com 1.- Let be the following example N1=740; fs=1e3;dt=1/fs % time reference t=[0:dt:N1*dt]; A=1 % signal f0=26 s0=A*cos(2*pi*f0*t); n0=wgn(N1+1,1,-36,'complex')'; ...

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1/3 Octave Analysis
0 votes

this is John BG 1.- Download Hastings' MATLAB app for ISO532 http://www.auditory.org/mhonarc/2000/msg00498.html 2.- update obsolete command wavread in the file LoadSound.m replace [y,fs,nbits]=...

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Ratio of the power in the sidebands to the total power in conventional AM
0 votes

this is John BG jgb2012@sky.com In AM modulation, as shown in https://en.wikipedia.org/wiki/Amplitude_modulation#Modulation_index the modulation index is the ratio between the amplitude of the ...

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Amplitude cutoff following FFT
0 votes

this is John BG jgb2012@sky.com 1.- Calibrate first the noise in absence of signals, and then look for signals. In the lab it's easy, on the field, it may be easy, or complicated, depending upon ...

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Cyclic prefix length in baseband OFDM with ZF equalizer
0 votes

this is John BG jgb2012@sky.com In the OFDM I studied, DVB-T, the cyclic prefix is not used to calculate BER, just to sync. 1.- Have a look at the following article: OFDM Receiver Performance ...

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How to solve with MATLAB Microwave Engineering David Pozar problem 29 chapter 2 Transmission Lines Theory
Accepted answer
-1 votes

the following broken-down MATLAB script generates the spiral that the impedance follows along the lossy transmission line detailed in the problem 29 chapter 2 Transmission Lines Theory in page 93 of ...

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GNU Radio QPSK 4 Symbols
-2 votes

Hi Zman147 this is John BG jgb2012@sky.com 1. what board are you using? 2. If you haven't chosen yet and are on budget have a look at the following link https://osmocom.org/projects/rtl-sdr/wiki/Rtl-...

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