Comic Strip: Undresstanding Technology

JavaScript: Browser-based Audio Analysis Using AnalyserNode

Greetings. 🎩 I will demonstrate the implementation of AnalyserNode to reveal (compute) the peaks and such from an audio source. This will only output the numbers rather than an elaborate animation. In this, we can choose whether to use a sample audio (hosted on a cloud storage) or a local audio file. Highlights of the flow: // 1. Create audio element audioElement = document.createElement("audio") // Make sure we convert the source to a proper Blob first, // not URL/path string like https://www.host... or local E:\path\to\file\... // Details in the code below the demonstration. audioElement.src = [Blob] // Then append the audio element to DOM // *** // 2. Setup AnalyserNode (use global variables to keep these) // Create audio context audioContext = new AudioContext() // Define the default FFT size fftDefault = 2048 // Create analyser analyser = new AnalyserNode( audioContext, { fftSize: fftDefault } ) // Create source node from the "audioElement" ab...

Math: Finding GCF and LCM Using Continuous Division (Translated to JavaScript)

Hi! In this, I'll show a method other than factorisation and clustering the factors to find GCF (Greatest Common Factor) and LCM (Least Common Multiple). I assume you're familiar with the first method. That is using factor tree and then grouping the results. I was taught to do this method in elementary school. The method has already been translated to an application on Port Raptor: GCFLCM.C . Let's start to implement the continuous division method. For example, we want to find GCF and LCM from: 8, 16, 18 Method: Create a table and write down those numbers as first row. Give some space for vertical column on the leftmost. The leftmost column will be used to list the divisor. The cells between the first row and first column are the division results (quotients). The division goes diagonally. Start with the division with 1, well... Then, divide starting from the lowest prime number → 2. If an element (or elements) can't be divided with current prime divis...

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