Noise cancellation

Overview

A voice agent is only as good as the audio it hears. If the transcription gets a word wrong, everything after it is wrong too. Noise cancellation cleans the audio before any of that happens, which means you’re not fixing errors later, you’re not creating them in the first place.

This is where things actually go wrong

Voice agents run over phone calls. Compressed audio, people in cars, call center background noise, street noise, speakerphones. On those calls the model isn’t the problem. The audio reaching it is. Swapping to a better transcription model won’t help much if what arrives is already unclear.

It works with any model you’re already using

Noise cancellation runs before transcription, so it improves whichever model you’re on, including your own key. Nothing else in your setup has to change.

How to use it

To activate noise cancellation for any model on the gateway, include this header in your request:

"X-Slng-Noise-Cancellation": "ai-coustics"

Here’s an example of the headers for a request using Deepgram Nova 3 in Australia:

const url =
  "wss://au.api.slng.ai/v1/stt/slng/deepgram/nova:3-en?language=en";

const socket = new WebSocket(url, {
  headers: {
    Authorization: `Bearer ${process.env.SLNG_TOKEN}`,
    "X-Slng-Noise-Cancellation": "ai-coustics",
  },
});

curl --request POST \
  --url https://au.api.slng.ai/v1/stt/slng/deepgram/nova:3-en \
  --header 'Authorization: Bearer <token>' \
  --header 'X-Slng-Noise-Cancellation: ai-coustics'\
  --header 'Content-Type: multipart/form-data' \
  --form audio='@example-file' \
  --form language=en

SLNG models

Noise cancellation works with every STT model in the SLNG catalog. Use your SLNG API key or project credentials and set the header, nothing else needed.

BYOK

Noise cancellation also works when you bring your own provider key, as long as the model is one we support. Same header, same behavior. See Bring your own key.

Regions

Noise cancellation runs in the region where you invoke it. Your speech is never processed or hosted in another region.

Get started

Regions

Execution layer

Agent Builder

Models

Integrate

Overview

This is where things actually go wrong

It works with any model you’re already using

How to use it

SLNG models

BYOK

Regions

​Overview

​This is where things actually go wrong

​It works with any model you’re already using

​How to use it

​SLNG models

​BYOK

​Regions

Overview

This is where things actually go wrong

It works with any model you’re already using

How to use it

SLNG models

BYOK

Regions