def METHOD_NAME(self):
    self.tb = gr.top_block()
    self.freqs = [110., -513., 203., -230, 121]
    # Number of channels to channelize.
    self.M = len(self.freqs)
    # Number of samples to use.
    self.N = 1000
    # Baseband sampling rate.
    self.fs = 5000
    # Input samp rate to channelizer.
    self.ifs = self.M * self.fs
    self.taps = filter.firdes.low_pass_2(
        1, self.ifs, self.fs / 2, self.fs / 10,
        attenuation_dB=80,
        window=fft.window.WIN_BLACKMAN_hARRIS)
    self.Ntest = 50