def audio_visualize_2d(self):
    t = np.linspace(0, 2. * np.pi, self.window * 2)
    xf = np.cos(t)
    yf = np.sin(t)
    fig, ax = plt.subplots(figsize=(7, 7))
    lf, = ax.plot(xf, yf, lw=1, color='lightblue')
    ax.set_xlim(-3, 3)
    ax.set_ylim(-3, 3)
    ax.set_axis_off()
    plt.show(block=False)
    plt.pause(self.record_delay)

    while self.stream.is_active():
        data = self.stream.read(self.window)
        data_int = struct.unpack(str(self.window * 2) + 'B', data)
        y_detrend = detrend(data_int)
        yft = np.abs(np.fft.fft(y_detrend))
        y_vals = yft / (64 * self.window)
        ind = np.where(y_vals > (np.max(y_vals) + np.min(y_vals)) / 2)
        y_vals[ind[0]] *= 4

        lf.set_xdata(xf + y_vals * np.cos(t))
        lf.set_ydata(yf + y_vals * np.sin(t))

        try:
            ax.figure.canvas.draw()
            ax.figure.canvas.flush_events()
        except TclError:
            self.stream.stop_stream()
            self.stream.close()
            break