SynthesizeSpeechConfig

Configuration of how speech should be synthesized.

JSON representation 
{
  "speakingRate": number,
  "pitch": number,
  "volumeGainDb": number,
  "effectsProfileId": [
    string
  ],
  "voice": {
    object (VoiceSelectionParams)
  }
}
Fields
speakingRate

number

Optional. Speaking rate/speed, in the range [0.25, 4.0]. 1.0 is the normal native speed supported by the specific voice. 2.0 is twice as fast, and 0.5 is half as fast. If unset(0.0), defaults to the native 1.0 speed. Any other values < 0.25 or > 4.0 will return an error.
pitch

number

Optional. Speaking pitch, in the range [-20.0, 20.0]. 20 means increase 20 semitones from the original pitch. -20 means decrease 20 semitones from the original pitch.
volumeGainDb

number

Optional. Volume gain (in dB) of the normal native volume supported by the specific voice, in the range [-96.0, 16.0]. If unset, or set to a value of 0.0 (dB), will play at normal native signal amplitude. A value of -6.0 (dB) will play at approximately half the amplitude of the normal native signal amplitude. A value of +6.0 (dB) will play at approximately twice the amplitude of the normal native signal amplitude. We strongly recommend not to exceed +10 (dB) as there's usually no effective increase in loudness for any value greater than that.
effectsProfileId[]

string

Optional. An identifier which selects 'audio effects' profiles that are applied on (post synthesized) text to speech. Effects are applied on top of each other in the order they are given.
voice

object (VoiceSelectionParams)

Optional. The desired voice of the synthesized audio.

VoiceSelectionParams

Description of which voice to use for speech synthesis.

JSON representation 
{
  "name": string,
  "ssmlGender": enum (SsmlVoiceGender)
}
Fields
name

string

Optional. The name of the voice. If not set, the service will choose a voice based on the other parameters such as languageCode and ssmlGender.

For the list of available voices, please refer to Supported voices and languages.
ssmlGender

enum (SsmlVoiceGender)

Optional. The preferred gender of the voice. If not set, the service will choose a voice based on the other parameters such as languageCode and name. Note that this is only a preference, not requirement. If a voice of the appropriate gender is not available, the synthesizer should substitute a voice with a different gender rather than failing the request.

SsmlVoiceGender

Gender of the voice as described in SSML voice element.

Enums
SSML_VOICE_GENDER_UNSPECIFIED An unspecified gender, which means that the client doesn't care which gender the selected voice will have.
SSML_VOICE_GENDER_MALE A male voice.
SSML_VOICE_GENDER_FEMALE A female voice.
SSML_VOICE_GENDER_NEUTRAL A gender-neutral voice.