Windowing

streaming mode | Standard category

Inputs

  • frame (vector_real) - the input audio frame

Outputs

  • frame (vector_real) - the windowed audio frame

Parameters

  • normalized (bool ∈ {true, false}, default = true) :
    a boolean value to specify whether to normalize windows (to have an area of 1) and then scale by a factor of 2
  • size (integer ∈ [2, ∞), default = 1024) :
    the window size
  • type (string ∈ {hamming, hann, hannnsgcq, triangular, square, blackmanharris62, blackmanharris70, blackmanharris74, blackmanharris92}, default = hann) :
    the window type, which can be 'hamming', 'hann', 'triangular', 'square' or 'blackmanharrisXX'
  • zeroPadding (integer ∈ [0, ∞), default = 0) :
    the size of the zero-padding
  • zeroPhase (bool ∈ {true, false}, default = true) :
    a boolean value that enables zero-phase windowing

Description

This algorithm applies windowing to an audio signal. It optionally applies zero-phase windowing and optionally adds zero-padding. The resulting windowed frame size is equal to the incoming frame size plus the number of padded zeros. By default, the available windows are normalized (to have an area of 1) and then scaled by a factor of 2.

An exception is thrown if the size of the frame is less than 2.

References:

[1] F. J. Harris, "On the use of windows for harmonic analysis with the discrete Fourier transform, Proceedings of the IEEE, vol. 66, no. 1, pp. 51-83, Jan. 1978

[2] Window function - Wikipedia, the free encyclopedia, http://en.wikipedia.org/wiki/Window_function

Streaming algorithms

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