amplitude-viewer

render amplitudes like an oscilloscope in the browser given arrays of data

amplitude-viewer

render amplitudes like an oscilloscope in the browser given arrays of data

example

var ascope = require('amplitude-viewer')(fn);
ascope.appendTo('#scope');
 
setInterval(function () {
    ascope.setTime(Date.now() / 1000);
    ascope.draw(fn);
}, 50);
 
function fn (t) {
    return sin(440) * 0.25 + sin(441) * 0.25 + sin(880) * 0.5;
    function sin (x) { return Math.sin(2 * Math.PI * t * x) }
}

methods

var viewer = require('amplitude-viewer')

Create a new viewer.

Append the ascope element to target, a query selector string or container element.

Set the drawing time in seconds.

Set an offset to the drawing time in seconds.

Set the width of the time window.

Draw a wave according to fn(t), which should return an amplitude from -1 to 1 give a time t in seconds.

install

With npm do:

npm install amplitude-viewer

license

MIT