Vibrate Android device programmatically

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Android has inbuilt functions to make a device vibrate.
You can specify a time for which the device vibrate and also check if the device can vibrate itself and other inbuilt services.


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Audio de-noising using Python (Wavelets)

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What is audio de-noising? Audio de-nosing is a process of removing noise(unwanted sound/signals from audio). You might have heard of noise cancellation headphones, these remove all the noise from the audio.  This process has various applications in media creation and learning. Also, de-noising is not only done on audio but also done on images. There are various methods to do this. We will see 2 methods and implement one. Method 1: FFT (Fourier Transform)    There are multiple different implementations of FT: FFT (fast FT), STFT (Short time FT). Also, there are inverse for each of them IFT respectively. So what is it? In short, FFT converts signals from one form to another, in audio, the time-series signal is converted to the frequency domain. More shortly, the dominant audio (your voice) will have more power than the non-dominant(noise). The following video will explain (a really good video):  Denoising with FFT (in Python)  Method 2: Wavelets (faster than FT) ...
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Using FFMPEG to trim your videos

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JWT Token Auth | JSON Web Tokens in Node.JS

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When you create a REST service or any backend server for a website or an app, there is one talk about this new trending method for authenticating the user who is requesting your servers for data.   Previously there were only a few ways to know where is the request coming from. That could be storing  cookies, sessions in browsers, and using them to identify the user. So this method evolved, the trick is to create a string that has info of the user and data about the user.   So JWT has payload, header, and signature which has info of the user and other important data. Why JSON you ask? because JSON is less verbose than XML and when encoded the size is small to easily use in HTTP transmissions. The authorization token is passed as:   Authorization: Bearer <token> How it works? User signs in with username and password.  The server creates a JWT using one of the algorithms (HMAC, RSA, or ECDSA). Then this token is sen...
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