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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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Google's new virtual braille keyboard

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Google's new virtual braille keyboard

Braille is a system for blind persons for reading and writing. It contains equivalents dots for letters and punctuation marks and provides symbols to show groupings of letters. Braille is read by moving the hand from left to right.

 According to the World Health Organization, at least 2.2 billion people globally have a vision impairment or blindness. To address their needs, Google revealed its new TalkBack braille keyboard, a virtual keyboard rolling out to devices running Android 5.0 or later.

 The company said that For people who are blind or have severely impaired vision, typing on a smartphone or computer typically requires an expensive and bulky physical braille computer – it is not exactly convenient if you want to make a quick reply on your phone.
Features:-
Google says its team collaborated with braille users and developers while coming up with the feature, and that it should be familiar to anyone who has typed using braille before:
The company said that It uses a standard 6-key layout and each key represents one of 6 braille dots which, when tapped, make any letter or a symbol. For typing “A” you would press dot 1 and for  typing a “B,” dots 1 and 2 together. The feature currently only supports braille grade one and a couple of in English.

 The company further said The keyboard works on any text field in android, and also allows you to delete letters and words, add lines, or submit the text.  But, other TalkBack gestures are not supported when the Braille keyboard is activated.


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

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