# Documentation

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# step

System object: dsp.AnalyticSignal
Package: dsp

Analytic signal

## Syntax

`Y = step(H,X)`

## Description

 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.

`Y = step(H,X)` computes the analytic signal, `Y`, of the M-by-N input matrix `X`, according to the equation

`$Y=X+jH\left\{X\right\}$`

where j is the imaginary unit and $H\left\{X\right\}$ denotes the Hilbert transform.

Each of the N columns in `X` contains M sequential time samples from an independent channel. The method computes the analytic signal for each channel.

 Note:   `H` specifies the System object on which to run this `step` method.The object performs an initialization the first time the `step` method is executed. This initialization locks nontunable properties and input specifications, such as dimensions, complexity, and data type of the input data. If you change a nontunable property or an input specification, the System object issues an error. To change nontunable properties or inputs, you must first call the `release` method to unlock the object.