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# AVAudioSession.PolarPattern

Constants that describe the possible polar patterns of the data source on an iOS device.

```
struct PolarPattern
```

## Overview

The direction of a polar pattern is relative to the orientation of the data source. For example, you can use the cardioid pattern with a back-facing data source to more clearly record sound from behind the device, or with a front-facing data source to more clearly record sound from in front of the device (such as the user’s voice).

## Topics

### Creating a Polar Pattern

[`init(rawValue:)`](/documentation/AVFAudio/AVAudioSession/PolarPattern/init(rawValue:))

Creates a new instance with the raw value you specify.

### Getting Standard Polar Patterns

[`AVAudioSessionPolarPatternStereo`](/documentation/AVFAudio/AVAudioSession/PolarPattern/stereo)

A polar pattern that captures a stereo image of an audio source.

[`AVAudioSessionPolarPatternCardioid`](/documentation/AVFAudio/AVAudioSession/PolarPattern/cardioid)

A data source that’s most sensitive to sound from the direction of the data source and is nearly insensitive to sound from the opposite direction.

[`AVAudioSessionPolarPatternSubcardioid`](/documentation/AVFAudio/AVAudioSession/PolarPattern/subcardioid)

A data source that’s most sensitive to sound from the direction of the data source and is less sensitive to sound from the opposite direction.

[`AVAudioSessionPolarPatternOmnidirectional`](/documentation/AVFAudio/AVAudioSession/PolarPattern/omnidirectional)

A data source that’s equally sensitive to sound from any direction.

## Relationships

### Conforms To

[`Equatable`](/documentation/Swift/Equatable)

[`SendableMetatype`](/documentation/Swift/SendableMetatype)

[`Sendable`](/documentation/Swift/Sendable)

[`Hashable`](/documentation/Swift/Hashable)

[`RawRepresentable`](/documentation/Swift/RawRepresentable)

---

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