class_docstr: Local Group Delay class.
  
  Parameters
  ----------
  stft : :class:`Phase` instance
       :class:`Phase` instance.
  kwargs : dict, optional
      If no :class:`Phase` instance was given, one is instantiated with
      these additional keyword arguments.
  
  Examples
  --------
  Create a :class:`LocalGroupDelay` from a :class:`ShortTimeFourierTransform`
  (or anything it can be instantiated from:
  
  >>> stft = ShortTimeFourierTransform('tests/data/audio/sample.wav')
  >>> lgd = LocalGroupDelay(stft)
  >>> lgd  # doctest: +NORMALIZE_WHITESPACE +ELLIPSIS
  LocalGroupDelay([[-2.2851 , -2.25605, ...,  3.13525,  0. ],
                   [ 2.35804,  2.53786, ...,  1.76788,  0. ],
                   ...,
                   [-1.98..., -2.93039, ..., -1.77505,  0. ],
                   [ 2.7136 ,  2.60925, ...,  3.13318,  0. ]])
class_docstr_tok: ["Local","Group","Delay","class",".","Parameters","--","--","--","--","--","stft",":",":","class",":","`","Phase","`","instance",":","class",":","`","Phase","`","instance",".","kwargs",":","dict",",","optional","If","no",":","class",":","`","Phase","`","instance","was","given",",","one","is","instantiated","with","these","additional","keyword","arguments",".","Examples","--","--","--","--","Create","a",":","class",":","`","LocalGroupDelay","`","from","a",":","class",":","`","ShortTimeFourierTransform","`","(","or","anything","it","can","be","instantiated","from",":",">",">",">","stft","=","ShortTimeFourierTransform","(","'tests\/data\/audio\/sample.wav","'",")",">",">",">","lgd","=","LocalGroupDelay","(","stft",")",">",">",">","lgd","#","doctest",":","+NORMALIZE_WHITESPACE","+ELLIPSIS","LocalGroupDelay","(","[","[","-2.2851",",","-2.25605",",","...",",","3.13525",",","0",".","]",",","[","2.35804",",","2.53786",",","...",",","1.76788",",","0",".","]",",","...",",","[","-1.98","...",",","-2.93039",",","...",",","-1.77505",",","0",".","]",",","[","2.7136",",","2.60925",",","...",",","3.13318",",","0",".","]","]",")"]
docstr: Bin frequencies.
code: def bin_frequencies(self):
      """Bin frequencies."""
      return self.stft.bin_frequencies
  
imports: from __future__ import absolute_import, division, print_function
  import warnings
  import numpy
  import scipy.fftpack
  from ..processors import Processor
  from .signal import Signal, FramedSignal
label_desc: Use image node_id 4 for calling the LocalGroupDelay obj's underlying member method code with example usage: obj.bin_frequencies() and returns: self