is it possible to change the pitch of the voice in AVSpeechSynthesizer's voice?

Question

Can I change the pitch of the voice in AVSpeechSynthesizer or putting any effects on the output voice from it so it could sound differently?

Answer 1

Yes, you can change the pitch and the rate of the spoken sentence.

The AVSpeechUtterance class has two relevant properties:

• pitchMultiplier: Float (value between 0.5 (lowest pitch) to 2.0 (highest pitch)). The default pitch is 1.0.
• rate: Float (value between two constants: AVSpeechUtteranceMinimumSpeechRate (the slowest rate of speech) and AVSpeechUtteranceMaximumSpeechRate (the highest rate of speech).

When you create your AVSpeechUtterance, simply set these properties appropriately before getting your AVSpeechSynthesizer to speak the utterance.

Note: You can also change the voice (accent) of AVSpeechUtterance.

I hope this helps. Let me know if anything I said was unclear.

Answer 2

The default pitch is 0.5.

AVSpeechUtteranceMinimumSpeechRate is 0.0

AVSpeechUtteranceMaximumSpeechRate is 1.0 (the highest rate of speech).

AVSpeechSynthesizer *synthesizer= [[AVSpeechSynthesizer alloc]init];
synthesizer.delegate=self; 
AVSpeechUtterance *utterances =
[AVSpeechUtterance speechUtteranceWithString:text];utterances.voice
= [AVSpeechSynthesisVoice voiceWithLanguage:@"de-DE"];//change voice utterances.rate=0.5;//default rate
[synthesizer
speakUtterance:utterances];