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Package detail

lowpassf

riversun609MIT0.5.0

lowpass filter for javascript/node

lowpass, linear weight

readme

Overview

lowpassf is simple lowpass filter libary for javascipt/node.js. It can be used to smooth real-time data including high frequency noises.

This library provides 2 ways.

  • Simple moving average
  • Weighted moving average

It is licensed under MIT license.

Usage

  var filter = new LowpassFilter();
  //Set average logic from ( filter.LinearWeightAverage/filter.SimpleAverage)
  filter.setLogic(filter.LinearWeightAverage);
    var data = [100, 100, 200, 200, 300, 300]
    var i;
    for (i = 0; i < data.length; i++) {
            //put current value
            filter.putValue(data[i]);
            //Get the latest calculated moving average of the values putted so far
            var filteredValue=filter.getFilteredValue();
        console.log(filteredValue);
    }

Examples

Here is a simple example. https://riversun.github.io/lowpassf/

Run on node.js

You can import library with npm.

Install

npm install --save-dev lowpassf

app.js

var LowpassFilter = require('lowpassf');

var filter = new LowpassFilter();
//Set average logic from ( filter.LinearWeightAverage/filter.SimpleAverage)
filter.setLogic(filter.LinearWeightAverage);


var data = [100, 100, 200, 200, 300, 300]
var i;
var sampleRange = 20;
console.log("Prepare data...");
for (i = 0; i < data.length; i++) {
    console.log("data[" + i + "]=" + data[i]);
}

console.log("");
console.log("Start filtering...");

//Specify how many items to buffer
filter.setSamplingRange(sampleRange);


for (i = 0; i < data.length; i++) {

    //put current value
    filter.putValue(data[i]);

    //get current "filtered" value
    //Get the latest calculated moving average of the values putted so far
    var filteredValue = filter.getFilteredValue();

    var logStr = "data[" + i + "]=" + data[i]
        + " added. current filtered val is "
        + filteredValue;

    console.log(logStr);

}

run on node.js

node app.js

Run on browser


<!DOCTYPE html>
<html lang="en">
<body>
<script src="src/LowpassFilter.js"></script>
<script>
    console.log = function (s) {
        document.write(s + "<br>");
    }
    var filter = new LowpassFilter();
        //Set average logic from ( filter.LinearWeightAverage/filter.SimpleAverage)
    filter.setLogic(filter.LinearWeightAverage);
    var data = [100, 100, 200, 200, 300, 300]
    var i;
    var sampleRange = 20;

    for (i = 0; i < data.length; i++) {
        console.log("data[" + i + "]=" + data[i]);
    }
    //Specify how many items to buffer
    filter.setSamplingRange(sampleRange);
    for (i = 0; i < data.length; i++) {
        //put current value
        filter.putValue(data[i]);
        //Get the latest calculated moving average of the values putted so far
        var filteredValue=filter.getFilteredValue();
        var logStr = "data[" + i + "]=" + data[i] + " added. current filtered val is " +filteredValue;
        console.log(logStr);
    }
</script>
</body>
</html>