> ## Documentation Index
> Fetch the complete documentation index at: https://developer.sanas.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Speech Enhancement Overview

> Restore and enhance voice quality in real time — denoising, speech reconstruction, de-reverberation, and bandwidth extension for crystal-clear Human ↔ Human audio.

# Speech Enhancement

> Restore, reconstruct, and enrich the human voice in real time.

Sanas **Speech Enhancement (SE)** models take degraded voice audio — noisy, reverberant, narrowband, or codec-compressed — and restore it to clear, natural, full-fidelity speech. Unlike noise cancellation, which focuses on removing unwanted sound, Speech Enhancement actively *reconstructs and enriches* the speech signal itself: cleaning up artifacts, filling in lost detail, and extending bandwidth for a richer, more intelligible result.

All Speech Enhancement models are optimized for <span class="tag-h2h">Human ↔ Human</span> experiences, where a person is on the other end of the line and perceived quality matters most.

## Core models

<CardGroup cols={3}>
  <Card title="SE Voice Isolation (General)" icon="volume-slash" href="/Docs/SE-Voice-Isolation">
    `(SE1.0) VI_G_SE` Isolates intended speech by removing background noise and voices. Optimized for human listeners.
  </Card>

  <Card title="Speech Enhancement · Enhanced" icon="microphone" href="/Docs/Models/Human-Human/se-1-2">
    `SE1.2` — Denoises, de-reverberates, and reconstructs degraded speech, with bandwidth extension to 24kHz.
  </Card>

  <Card title="Speech Enhancement · Standard" icon="microphone" href="/Docs/Models/Human-Human/SE-Standard">
    **`SE2.1`** Restores and enhances voice quality for telephony audio. Low CPU footprint.
  </Card>

  <Card title="Speech Enhancement · Full-Fidelity" icon="microphone" href="/Docs/Models/Human-Human/SE-full-fidelity">
    **`SE2.2`** Full-fidelity speech enhancement with bandwidth extension to ultra-fidelity 24kHz.
  </Card>
</CardGroup>

## What Speech Enhancement does

* **Denoising** — removes residual background noise and leaked voices.
* **Speech reconstruction** — restores degraded or missing detail to improve intelligibility and clarity.
* **De-reverberation** — reduces room reverb and echo.
* **Bandwidth extension** — rebuilds high-frequency content to widen narrowband audio.
* **Codec restoration** — recovers quality lost to low-bitrate compression.

## Models

| Model                                                | Use Case                                   | Description                                                                                                                                                                                               | Best For                                                                                                                                                                                                                          |
| ---------------------------------------------------- | ------------------------------------------ | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `VI_G_SE (SE 1.0)`<br />SE Voice Isolation (General) | <span class="tag-h2h">Human ↔ Human</span> | Isolates intended speech by removing background noise and voices. Optimized for human listeners.                                                                                                          | Contact centers, conferencing, gaming                                                                                                                                                                                             |
| `SE1.2`<br />Speech Enhancement · Enhanced           | <span class="tag-h2h">Human ↔ Human</span> | Full-fidelity speech enhancement model that denoises, de-reverberates, reconstructs degraded speech, and extends bandwidth to 24kHz for clear, natural human-to-human audio.when input or codec-degraded. | Restoring noisy, reverberant, or codec-degraded voice audio to premium full-fidelity quality in contact centers, conferencing, and telemedicine.                                                                                  |
| `SE2.1`<br />SE Standard                             | <span class="tag-h2h">Human ↔ Human</span> | Restores and enhances voice quality for telephony audio, outputting 8kHz                                                                                                                                  | Contact centers, telephony, IVR systems                                                                                                                                                                                           |
| `SE2.2`<br />SE Full-Fidelity                        | <span class="tag-h2h">Human ↔ Human</span> | Full-fidelity speech enhancement model that restores voice quality and extends bandwidth from 16kHz input to ultra-fidelity 24kHz output for a richer, more natural listening experience.                 | Delivering premium, high-fidelity voice quality in contact centers, conferencing, telemedicine, and voice-recording restoration where clarity and vocal presence matter most. Premium contact centers, conferencing, telemedicine |

{/*  VI_G_SE3.0 specs below carried from the VI_G_NC3.0 entry on the Models
Overview page (older _NC naming) — confirm they apply to VI_G_SE3.0.  */}

## Choose a model

<CardGroup cols={3}>
  <Card title="SE Voice Isolation (General)" icon="volume-slash" href="/Docs/SE-Voice-Isolation">
    `VI_G_SE (SE1.0) `— Isolates intended speech by removing background noise and voices. Optimized for human listeners.

    * **Latency:** \~40ms
    * **Sample rate:** Up to 24kHz
    * **Range:** Primary speaker within \~1m
  </Card>

  <Card title="Speech Enhancement · Enhanced" icon="microphone" href="/Docs/Models/Human-Human/SE-Ultra-Plus">
    `SE1.2` — Denoises, de-reverberates, and reconstructs degraded speech, with bandwidth extension to 24kHz.

    * **Latency:** \~40ms
    * **Sample rate:** 16kHz → 24kHz
  </Card>

  <Card title="Speech Enhancement · Standard" icon="microphone" href="/Docs/Models/Human-Human/SE-Standard">
    `SE2.1` — Restores and enhances voice quality for telephony audio. Low CPU footprint.

    * **Latency:** 120ms
    * **Sample rate:** 16kHz → 8kHz
  </Card>

  <Card title="Speech Enhancement · Full Fidelity" icon="microphone" href="/Docs/Models/Human-Human/SE-Ultra">
    `SE2.2` — Full-fidelity speech enhancement with bandwidth extension to ultra-fidelity 24kHz.

    * **Latency:** 160ms
    * **Sample rate:** 16kHz → 24kHz
  </Card>
</CardGroup>

## How to choose

* Pick **SE Voice Isolation 1.0 (**`VI_G_SE`**)** when you need to isolate the intended speaker — removing background noise and other voices — for a human listener, in contexts like contact centers, conferencing, and gaming.
* Pick **SE Standard (`SE2.1`)** when your output path is narrowband telephony (8kHz) and you want the lowest CPU footprint — ideal for high-volume contact center and IVR deployments.
* Pick **SE Full-Fidelity (**`SE2.2`**)** when you need full-fidelity 24kHz output for premium voice experiences such as conferencing and telemedicine.
* Pick **SE Ehanced (**`SE1.2`**)** when input audio is not just narrowband but also noisy, reverberant, or degraded by low-bitrate codecs — Ultra+ restores maximum intelligibility and clarity on top of full 24kHz bandwidth extension.

<Note>
  All Speech Enhancement models accept input up to 16kHz. Input bandwidth above 8kHz is not required, and `SE2.2` and `SE1.2` render output at a full 24kHz.
</Note>