SynthesizeSpeechRequest constructor
      
      SynthesizeSpeechRequest({ 
    
    
- AdvancedVoiceOptions? advancedVoiceOptions,
- AudioConfig? audioConfig,
- SynthesisInput? input,
- VoiceSelectionParams? voice,
Implementation
SynthesizeSpeechRequest({
  this.advancedVoiceOptions,
  this.audioConfig,
  this.input,
  this.voice,
});