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# step

System object: phased.OmnidirectionalMicrophoneElement
Package: phased

Output response of microphone

## Syntax

RESP = step(H,FREQ,ANG)

## Description

RESP = step(H,FREQ,ANG) returns the microphone's magnitude response, RESP, at frequencies specified in FREQ and directions specified in ANG.

 Note:   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.

## Input Arguments

 H Microphone object. FREQ Frequencies in hertz. FREQ is a row vector of length L. ANG Directions in degrees. ANG can be either a 2-by-M matrix or a row vector of length M. If ANG is a 2-by-M matrix, each column of the matrix specifies the direction in the form [azimuth; elevation]. The azimuth angle must be between –180 and 180 degrees, inclusive. The elevation angle must be between –90 and 90 degrees, inclusive. If ANG is a row vector of length M, each element specifies a direction's azimuth angle. In this case, the corresponding elevation angle is assumed to be 0.

## Output Arguments

 RESP Response of microphone. RESP is an M-by-L matrix that contains the responses of the microphone element at the M angles specified in ANG and the L frequencies specified in FREQ.

## Examples

Create an omnidirectional microphone. Find the microphone response at 200, 300, and 400 Hz for the incident angle [0;0]. Plot the azimuth response of the microphone.

```h = phased.OmnidirectionalMicrophoneElement(...
'FrequencyRange',[20 2e3]);
fc = [200 300 400];
ang = [0;0];
resp = step(h,fc,ang);
plotResponse(h,200,'RespCut','Az','Format','Polar');```