def METHOD_NAME(self, x):
    """Analysis with PQMF.
    Args:
        x (Tensor): 
            Input tensor (B, 1, T).
    Returns:
        Tensor: Output tensor (B, subbands, T // subbands).
    """
    x = F.conv1d(self.pad_fn(x), self.analysis_filter)
    return F.conv1d(x, self.updown_filter, stride=self.subbands)