def filter(self, chanis=-1, f0=500, f1=0, fr=100, gpass=0.01, gstop=50, ftype='ellip',
plot=False):
b, a = LFP.filter(self, chanis, f0, f1, fr, gpass, gstop, ftype)
if plot:
self.plot(0.31, 0.325, chanis=chanis)
self.specgram(0, 500, f1=2000, p0=None, p1=None)
return b, a
