code: def getSignalsList(tests):
      """
      getSignalsList(['testWindowWholeRange', 'testFrameSize']])
      """
      signals = {}
  
      for test in tests:
          for signalNeeded in test2SignalsMapping[test]:
              if not signalNeeded in signals.keys():
                  signals[signalNeeded] = getSignal(signalNeeded)
      return signals
  
file_path: essentia/test/src/qa/hpcp/test_hpcp_generatesignals.py
imports: import random
  import numpy
  from scipy.signal import spectrogram
  import essentia
  from essentia.standard import *
  from test_hpcp_parameters import *
label_desc: Use image node_id 1 for calling a global function with example usage: getSignalsList(tests) and returns: signals