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_delay.py
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_delay.py
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# -*- coding: utf-8 -*-
# _delay.py
# This module provides the delay function.
# Copyright 2013 Giuseppe Venturini
# This file is part of python-deltasigma.
#
# python-deltasigma is a 1:1 Python replacement of Richard Schreier's
# MATLAB delta sigma toolbox (aka "delsigma"), upon which it is heavily based.
# The delta sigma toolbox is (c) 2009, Richard Schreier.
#
# python-deltasigma is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# LICENSE file for the licensing terms.
"""This module provides the delay() function, used to delay a signal by a
specified amount of samples.
"""
import numpy as np
def delay(x, n=1):
"""Delay signal ``x`` by ``n`` samples.
"""
x = np.atleast_1d(x)
nx = max(x.shape)
if nx <= n:
y = np.zeros(x.shape)
else:
if len(x.shape) == 1:
y = np.concatenate((np.zeros((n,)), x[:nx-n]))
elif x.shape[0] > x.shape[1]:
y = np.concatenate((np.zeros((n, x.shape[1])), x[:nx-n, :]), axis=0)
else:
y = np.concatenate((np.zeros((x.shape[0], n)), x[:, :nx-n]), axis=1)
return y