code: def analysis(self, x):
      return F.conv1d(x, self.H, padding=self.taps // 2, stride=self.N)
  
file_path: TTS/TTS/vocoder/layers/pqmf.py
imports: import numpy
  import torch
  import torch.nn.functional
  from scipy import signal
label_desc: Use image node_id 3 for calling the PQMF obj's underlying member method code with example usage: obj.analysis(x) and returns: F