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phase-unwrap

phase-unwrap

1D phase unwrapping

Example

var ndarray = require("ndarray")
var unwrap = require("phase-unwrap")
var plot = require("plotter").plot
 
 
//Create a signal 
var x = ndarray.zeros([100])
require("ndarray-fill")(x, function(i) {
  return (0.25 * i) % (2.0 * Math.PI)
})
 
//Plot input signal 
plot({
  data:  Array.prototype.slice.call(x.data),
  filename: "input.svg"
})
 
//Unwrap 
unwrap(x)
 
//Plot unwrapped signal 
plot({
  data:  Array.prototype.slice.call(x.data),
  filename: "unwrapped.svg"
})

And here are the results:

Input signal

Unwrapped signal

Install

npm install phase-unwrap

require("phase-unwrap")(signal)

Unwraps the phase angle of a signal whose values are between 0 and 2pi to a continuous signal.

  • signal is a 1D ndarray of values

Returns An signal. Note that the unwrapping modifies signal.

Credits

(c) 2013 Mikola Lysenko. MIT License