def filterord(self, chanis=-1, f0=300, f1=None, order=4, btype='highpass', ftype='butter',
plot=False):
b, a = LFP.filterord(self, chanis, f0, f1, order, btype, ftype)
if plot:
self.plot(0.31, 0.325, chanis=chanis)
self.specgram(0, 500, f1=2000, p0=None, p1=None)
return b, a
