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# Encoder settings

The constants that define the audio encoder settings for the audio recorder class.

## Topics

### Encoder setting keys

[`let AVEncoderASPFrequencyKey: String`](/documentation/AVFAudio/AVEncoderASPFrequencyKey)

[`let AVEncoderAudioQualityKey: String`](/documentation/AVFAudio/AVEncoderAudioQualityKey)

A constant that represents an integer from the audio quality enumeration.

[`let AVEncoderBitDepthHintKey: String`](/documentation/AVFAudio/AVEncoderBitDepthHintKey)

[`let AVEncoderBitRateKey: String`](/documentation/AVFAudio/AVEncoderBitRateKey)

[`let AVEncoderBitRatePerChannelKey: String`](/documentation/AVFAudio/AVEncoderBitRatePerChannelKey)

[`let AVEncoderBitRateStrategyKey: String`](/documentation/AVFAudio/AVEncoderBitRateStrategyKey)

A constant that represents the bit rate strategy for the encoder to use.

[`let AVEncoderContentSourceKey: String`](/documentation/AVFAudio/AVEncoderContentSourceKey)

[`let AVEncoderDynamicRangeControlConfigurationKey: String`](/documentation/AVFAudio/AVEncoderDynamicRangeControlConfigurationKey)


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