Discrete Impulse

Generate discrete impulse

• Library:

• DSP System Toolbox / Sources

• 

Description

The Discrete Impulse block generates an impulse (the value 1) at output sample D+1, where you specify D using the Delay parameter (D ≥ 0). All output samples preceding and following sample D+1 are zero.

When D is a length-N vector, the block generates an M-by-N matrix output representing N distinct channels, where you specify frame size M using the Samples per frame parameter. The impulse for the ith channel appears at sample D(i)+1.

The Sample time parameter value, T_s, specifies the output signal sample period. The resulting frame period is MT_s.

Ports

Output

Port_1 — Discrete impulse signal

scalar | vector | matrix

Output signal containing a discrete impulse at output sample D(i)+1, where D is a scalar or vector specified by the Delay parameter. For more information, see Description.

Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | Boolean | fixed point

Parameters

Main

Delay (samples) — Number of zero-valued output samples

0 (default) | scalar | vector

The number of zero-valued output samples, D, preceding the impulse, specified as a scalar or vector of integer values, greater than or equal to zero. A length-N vector specifies an N-channel output.

Sample time — Output sample period

1 (default) | positive scalar

The sample period, T_s, of the output signal specified as a positive finite scalar. The output frame period is MT_s.

Samples per frame — Samples per frame

1 (default) | positive integer

The number of samples, M, in each output frame, specified as a positive integer scalar.

Data Types

Output data type — Output data type

double (default) | single | int8 | uint8 | int16 | uint16 | int32 | uint32 | int64 | uint64 | boolean | fixdt(1,16) | fixdt(1,16,0) | Inherit: Inherit via back propagation | <data type expression>

Specify the output data type for this block. You can select one of the following:

• A rule that inherits a data type, for example, Inherit: Inherit via back propagation. When you select this option, the output data type and scaling matches that of the next downstream block.

• A built-in data type, such as double

• An expression that evaluates to a valid data type, for example, fixdt(1,16)

For help setting data type parameters, display the Data Type Assistant by clicking the Show data type assistant button .

See Control Signal Data Types (Simulink) for more information.

Model Examples

Generate Discrete Impulse with Three Channels

This model example shows how to generate a discrete impulse signal with three channels and a data type of double.

Block Characteristics

Data Types	Boolean | double | fixed point | integer | single
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™.

Fixed-Point Conversion
Design and simulate fixed-point systems using Fixed-Point Designer™.