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 (e.g., 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.

Lower than 1.0 is faster than default. Higher than 1.0 is slower than default.

{
    ...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. 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.

{
    ...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.