First-Order Hold (Obsolete)

Implement first-order sample-and-hold

• Library:

• Simulink / Discrete

• 

Description

Note

First-Order Hold is not recommended for continuous to discrete signal conversion. Use Zero-Order Hold instead.

The First-Order Hold block implements a first-order sample-and-hold that operates at the specified sampling interval.

This figure compares the output from a Sine Wave block and a First-Order Hold block.

Ports

Input

Port_1 — Input signal

scalar | vector | matrix

Input signal, specified as a scalar, vector, or matrix.

Data Types: double

Output

Port_1 — First-order sample-and-hold

scalar | vector | matrix

First-order sample and hold applied to the input signal.

Data Types: double

Parameters

Sample time — Time interval between samples

1 (default) | scalar | vector

The time interval between samples. See Specify Sample Time for more information.

Programmatic Use

Block Parameter: Ts

Type: character vector

Values: scalar | vector

Default: '1'

Model Examples

First-Order Sample-and-Hold of a Sine Wave

Perform a first-order sample-and-hold of a sine wave signal using the First-Order Hold block.

Block Characteristics

Data Types	double
Direct Feedthrough	no
Multidimensional Signals	no
Variable-Size Signals	no
Zero-Crossing Detection	no

Extended Capabilities

C/C++ Code Generation

Generate C and C++ code using Simulink® Coder™.

Not recommended for production code. Relates to resource limits and restrictions on speed and memory often found in embedded systems. Generated code can contain dynamic allocation and freeing of memory, recursion, additional memory overhead, and widely-varying execution times. While the code is functionally valid and generally acceptable in resource-rich environments, smaller embedded targets often cannot support such code. Usually, blocks evolve toward being suitable for production code. Thus, blocks suitable for production code remain suitable.