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Rime allows you to customize the speaking speed of your voice agents, enabling you to:
  • Enhance accessibility for diverse audiences.
  • Tailor speech to specific applications (for example, slower pace for explanatory materials).
  • Optimize the conversation to suit various contexts.
Learn how to adjust the speaking speed using Rime’s APIs.

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Adjusting the overall speed

Overall speaking speed in Rime is controlled using the speedAlpha parameter. The direction of speedAlpha depends on the model:
  • mist, mistv2: Lower than 1.0 is faster; higher than 1.0 is slower.
  • mistv3, arcana: Higher than 1.0 is faster; lower than 1.0 is slower.
{
    ...otherParams,
    "text": "Hello, world!",
    "speedAlpha": 1.2
}

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Adjusting the speed of individual words

To adjust the speed of individual words or phrases, use the inlineSpeedAlpha parameter. inlineSpeedAlpha takes a comma-separated list of speed values applied to words in square brackets. The direction of inlineSpeedAlpha depends on the model, matching speedAlpha:
  • mist, mistv2: Values < 1.0 speed up speech, > 1.0 slow it down.
  • mistv3, arcana: Values > 1.0 speed up speech, < 1.0 slow it down.
For example: “This sentence is [really] [fast]” with inlineSpeedAlpha “0.5, 3” will make “really” slow and “fast” fast on mistv3/arcana, or the reverse on mist/mistv2. 
{
    ...otherParams,
    “text”: “This sentence is [really] [fast]”,
    “inlineSpeedAlpha”: “0.5, 3”
}

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Recommendations

By effectively utilizing Rime’s speed control features, you can create more varied conversational AI experiences.
  • Use speedAlpha to adjust the overall speed of the speech.
  • Use inlineSpeedAlpha to adjust the speed of individual words or phrases.
  • Experiment with different values to find the best fit for your use case.
  • Be mindful that large speed adjustments may impact the naturalness and clarity of the synthesized speech.