Fixed-Point Blockset

Tapped Delay

Delay a scalar signal multiple sample periods and output all the delayed versions

Library

Delays & Holds

Description

The Tapped Delay block delays its input by the specified number of sample periods, and outputs all the delayed versions.

This block provides a mechanism for discretizing a signal in time, or resampling the signal at a different rate. You specify the time between samples with the Sample time parameter. You specify the number of delays with the Number of delays parameter. A value of -1 instructs the block to inherit the number of delays by backpropagation. Each delay is equivalent to the z^-1 discrete-time operator, which is represented by the Unit Delay block.

The block accepts one scalar input and generates an output for each delay. The input must be a scalar. You specify the order of the output vector with the Order output vector starting with parameter list. Oldest orders the output vector starting with the oldest delay version and ending with the newest delay version. Newest orders the output vector starting with the newest delay version and ending with the oldest delay version.

The block output for the first sampling period is specified by the Initial condition parameter. Careful selection of this parameter can minimize unwanted output behavior.

Parameters and Dialog Box

Initial condition

The initial output of the simulation.

Sample time

Sample time.

Number of delays

The number of discrete-time operators.

Order output vector starting with

Specify whether the oldest delay version is output first, or the newest delay version is output first.

Conversions

The Initial condition parameter is converted from a double to the input data type offline using round-to-nearest and saturation.

Characteristics

Input Port	Any data type supported by the blockset
Output Port	Same as the input
Direct Feedthrough	No
Scalar Expansion	Yes--of initial conditions

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