---
title: pitchBase
framework: appkit
role: symbol
role_heading: Type Property
path: appkit/nsspeechsynthesizer/speechpropertykey/pitchbase
---

# pitchBase

Get or set a synthesizer’s baseline speech pitch.

## Declaration

```swift
static let pitchBase: NSSpeechSynthesizer.SpeechPropertyKey
```

## Discussion

Discussion An NSNumber object that specifies the baseline speech pitch. Typical voice frequencies range from around 90 hertz for a low-pitched voice to perhaps 300 hertz for a high-pitched voice. These frequencies correspond to approximate pitch values in the ranges of 30.000 to 40.000 and 55.000 to 65.000, respectively. This property is used with setObject(_:forProperty:) and object(forProperty:). note: The change in speech pitch may not be noticeable until the next sentence or paragraph is spoken.

## See Also

### Speech Property Keys

- [status](appkit/nsspeechsynthesizer/speechpropertykey/status.md)
- [errors](appkit/nsspeechsynthesizer/speechpropertykey/errors.md)
- [inputMode](appkit/nsspeechsynthesizer/speechpropertykey/inputmode.md)
- [characterMode](appkit/nsspeechsynthesizer/speechpropertykey/charactermode.md)
- [numberMode](appkit/nsspeechsynthesizer/speechpropertykey/numbermode.md)
- [rate](appkit/nsspeechsynthesizer/speechpropertykey/rate.md)
- [pitchMod](appkit/nsspeechsynthesizer/speechpropertykey/pitchmod.md)
- [volume](appkit/nsspeechsynthesizer/speechpropertykey/volume.md)
- [synthesizerInfo](appkit/nsspeechsynthesizer/speechpropertykey/synthesizerinfo.md)
- [recentSync](appkit/nsspeechsynthesizer/speechpropertykey/recentsync.md)
- [phonemeSymbols](appkit/nsspeechsynthesizer/speechpropertykey/phonemesymbols.md)
- [currentVoice](appkit/nsspeechsynthesizer/speechpropertykey/currentvoice.md)
- [commandDelimiter](appkit/nsspeechsynthesizer/speechpropertykey/commanddelimiter.md)
- [reset](appkit/nsspeechsynthesizer/speechpropertykey/reset.md)
- [outputToFileURL](appkit/nsspeechsynthesizer/speechpropertykey/outputtofileurl.md)