User`s guide

Integer Delay

5-241

5Integer Delay

Purpose Delay an input by an integer number of sample periods.

Library Signal Operations

Description The Integer Delay block delays a discrete-time input by the number of sample

intervals specified in the

Delay parameter. Noninteger delay values are

rounded to the nearest integer, and negative delays are clipped at 0.

Sample-Based Operation

When the input is a sample-based M-by-N matrix, the block treats each of the

∗N matrix elements as an independent channel. The Delay parameter, v, can

be an M-by-N matrix of positive integers that specifies the number of sample

intervals to delay each channel of the input, or a scalar integer by which to

equally delay all channels.

For example, if the input is M-by-1 and v is the matrix

[v(1) v(2) ... v(M)]', the first channel is delayed by v(1) sample intervals,

the second channel is delayed by

v(2) sample intervals, and so on. Note that

when a channel is delayed for sample-time units, the output sample at time

is the input sample at time . If is negative, then the output is the

corresponding value specified by the

Initial conditions parameter.

A 1-D vector of length M is treated as an M-by-1 matrix, and the output is 1-D.

The

Initial conditions parameter specifies the output of the block during the

initial delay in each channel. The initial delay for a particular channel is the

time elapsed from the start of the simulation until the first input in that

channel is propagated to the output. Both fixed and time-varying initial

conditions can be specified in a variety of ways to suit the dimensions of the

input.

Fixed Initial Conditions. A fixed initial condition in sample-based mode can be

specified as one of the following:

•Scalar value to be repeated at each sample time of the initial delay (for every

channel). For a 2-by-2 input with the parameter settings below,

∆

tt∆– t ∆–