Speechify

Speechify tuning is passed in synthesizer.options.

{
  "verb": "say",
  "text": "Thanks for calling, how can I help you today?",
  "synthesizer": {
    "vendor": "speechify",
    "language": "en-US",
    "voice": "geffen_32",
    "options": {
      "loudness_normalization": true,
      "text_normalization": true
    }
  }
}

You can also set these in the portal under Extra Options on the speech credential, in which case they apply to every request that uses that credential. Settings supplied on the verb take precedence.

Options

loudness_normalization

boolean

Normalize the output to a consistent loudness. Defaults to false.

text_normalization

boolean

Expand numbers, dates and abbreviations before synthesis. Defaults to false.

Models

If no model is set on the credential or verb, jambonz picks simba-3.2 (lowest latency, English only) when the language is English or unset, and simba-3.0 (multilingual) otherwise. Setting simba-3.2 for a non-English language is rejected by Speechify.

Endpoint override

Set api_uri in options (or in the credential’s Extra Options) to use a different Speechify host. Leave it out to use api.speechify.ai.

Streaming

Speechify supports TTS streaming. Speechify has no input-streaming connection, so jambonz sends each sentence as its own request as soon as it is complete. Speechify returns word timestamps, so when a caller barges in on an agent, the assistant turn is trimmed to what the caller actually heard.