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MATLAB : Fourier transform

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By Nuno Nogueira, CC BY-SA 2.5, https://commons.wikimedia.org/w/index.php?curid=3912826 MATLAB has been  crucial programming language across worldwide that let us express matrix and array mathematics directly. In signal processing and communication it plays vital role in analysing and exploring time series data in time domain or frequency domain. For analysing non periodic signals in frequency domain we use Fourier transform instead of Fourier series ,which is used to express periodic signals in terms of infinite sum of sinusoidal terms .   Fourier transform can exist for :      1. Energy signals      2. Power signals       3. Impulse signals  That means absolutely integrable signals can have their Fourier transform only.  Formula for Fourier transform;   Then its come to use Fourier transform in MATLAB. So here is the code for Fourier transform of sinusoidal wave , for any other signal we ...
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Can we convert brain activities into text?

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can we convert brain activities into text?

Can we convert brain activities into text? The answer is yes! A new Artificial Intelligence system that converts brain activity into text could transform communication for people who can not speak or type. The mind-reading machine is used as a brain implant to track what neuron do when someone speaks. An algorithm then converts the data into a string of numbers, which another system then translates into a sequence of the word.

This system was developed by researchers from the University of California, San Francisco, who revealed their finding in the journal Nature Neuroscience.

The researchers tested their system on four people with brain implants that monitor their epileptic seizures. The participant was asked to read a range of simple sentence aloud, including “Tina Turner is a pop singer” and “the oasis was a mirage”.

As they spoke, their brain signals were fed into a computer and decoded into word. The system sometimes struggled to convert the word into coherent sentences. For example, it translate “those musicians harmonize marvellously” into “the spinach was a famous singer.”

Can we convert brain activities into text?

But the AI  is still more accurate than other speech transcription systems. The researchers said that the tech currently only works when someone is speaking aloud. However, it could be upgraded to translate the thought of people who can not communicate verbally, such as those with locked-in syndrome, a neurological disorder that causes paralysis.         

Student at National Institute of Technology, Patna, Bihar (India).

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