Documentation

This is machine translation

Translated by Microsoft
Mouseover text to see original. Click the button below to return to the English verison of the page.

Note: This page has been translated by MathWorks. Please click here
To view all translated materals including this page, select Japan from the country navigator on the bottom of this page.

comm.DifferentialEncoder System object

Encode binary signal using differential coding

Description

The DifferentialEncoder object encodes the binary input signal within a channel. The output is the logical difference between the current input element and the previous output element.

To encode a binary signal using differential coding:

  1. Define and set up your differential encoder object. See Construction.

  2. Call step to encode a binary signal according to the properties of comm.DifferentialEncoder. The behavior of step is specific to each object in the toolbox.

Note

Starting in R2016b, instead of using the step method to perform the operation defined by the System object™, you can call the object with arguments, as if it were a function. For example, y = step(obj,x) and y = obj(x) perform equivalent operations.

Construction

H = comm.DifferentialEncoder creates a differential encoder System object, H. This object encodes a binary input signal by calculating its logical difference with the previously encoded data.

H = comm.DifferentialEncoder(Name,Value) creates object, H, with each specified property set to the specified value. You can specify additional name-value pair arguments in any order as (Name1,Value1,...,NameN,ValueN).

Properties

InitialCondition

Initial value used to generate initial output

Specify the initial condition as a real scalar. This property can have a logical, numeric, or fixed-point (embedded.fi object) data type. The default is 0. The object treats nonbinary values as binary signals.

Methods

resetReset states of differential encoder object
stepEncode binary signal using differential coding
Common to All System Objects
clone

Create System object with same property values

getNumInputs

Expected number of inputs to a System object

getNumOutputs

Expected number of outputs of a System object

isLocked

Check locked states of a System object (logical)

release

Allow System object property value changes

Examples

expand all

Create a differential encoder object.

diffEnc = comm.DifferentialEncoder;

Generate random binary data. Encode the data.

data = randi([0 1],10,1);
encData = diffEnc(data)
encData = 

     1
     0
     0
     1
     0
     0
     0
     1
     0
     1

Algorithms

This object implements the algorithm, inputs, and outputs described on the Differential Encoder block reference page. The object properties correspond to the block parameters, except:

The object only supports single channel, column vector inputs.

Extended Capabilities

Introduced in R2012a

Was this topic helpful?