---
description: Nith is ABR's family of streaming on-device text-to-speech models that start speaking as soon as the first text arrives.
---

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# Nith Text-to-Speech

Nith is a family of text-to-speech models optimized for local, real-time speech synthesis. All processing runs on-device, with no cloud dependency.

Nith begins vocalization as soon as the first text buffer is received, delivering natural-sounding speech on resource-constrained edge hardware.

## Key Features

- **Low-latency:** Text is processed in small buffers so vocalizations start quickly
- **Private:** All speech synthesis runs locally; no text is sent to the cloud
- **Small footprint, high quality:** Natural-sounding speech from models that run on edge hardware
- **Custom vocabulary:** Specific pronunciation of brand names, technical jargon, and domain- or application-specific words can be added without retraining
- **Multi-language:** English, Spanish, Chinese (Mandarin), Japanese, and Korean; additional languages available upon request

<span style="font-size: 1.125em; font-weight: bold;">Premium Features</span>

- **Custom voices:** New TTS voices can be created from a 6-second audio clip

## Models

Select a model based on your language requirements. All models accept text input, output raw 16 kHz mono PCM audio with no file headers, and have both male and female versions.

<div class="table-wrapper">
<table class="model-matrix">
  <thead>
    <tr>
      <th colspan="2"></th>
      <th>nith-5m-live.en</th>
      <th>nith-5m-live.es</th>
      <th>nith-5m-live.zh</th>
      <th>nith-5m-live.ja</th>
      <th>nith-5m-live.ko</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td class="feature" colspan="2">Language</td>
      <td>English</td>
      <td>Spanish</td>
      <td>Chinese (Mandarin)</td>
      <td>Japanese</td>
      <td>Korean</td>
    </tr>
    <tr class="group-start">
      <td class="group"><span>Specs</span></td>
      <td class="feature">Quantization</td>
      <td colspan="5">Mixed 8/32-bit</td>
    </tr>
  </tbody>
</table>
</div>

## About the Name

ABR names its model families after rivers. State space models process sequential data as a continuous flow, always moving forward and maintaining state efficiently over time. The Nith model family is named for the river near ABR's hometown of Waterloo, Ontario, Canada.