> Fetch clean Markdown by appending `.md` to any page URL under https://signalwire.com/docs or requesting it with the HTTP header `Accept: text/markdown`. The root index at https://signalwire.com/docs/llms.txt lists the available documentation indexes.

# denoise

> Start noise reduction on a call.

[denoise-stop]: /docs/server-sdks/reference/typescript/relay/call/denoise-stop

[calling-call-denoise]: /docs/server-sdks/reference/typescript/relay/call#events

[call-events]: /docs/server-sdks/reference/typescript/relay/call#events

Start noise reduction on the call. Filters background noise from the audio
to improve clarity.

> **Info**
>
> Use [`denoiseStop()`][denoise-stop] to disable noise reduction.

> **Info**
>
> This method emits [`calling.call.denoise`][calling-call-denoise] events. See [Call Events][call-events] for payload details.

## **Parameters**

None.

## **Returns**

`Promise<Record<string, unknown>>` -- Server response confirming noise reduction has started.

## **Example**

```typescript {12}
import { RelayClient } from '@signalwire/sdk';

const client = new RelayClient({
  project: process.env.SIGNALWIRE_PROJECT_ID!,
  token: process.env.SIGNALWIRE_API_TOKEN!,
  contexts: ['default']
});

client.onCall(async (call) => {
  await call.answer();

  const result = await call.denoise();
  console.log(`Noise reduction started: ${JSON.stringify(result)}`);

  const action = await call.play([{ type: 'tts', text: 'Noise reduction is now active.' }]);
  await action.wait();
});

await client.run();
```

> Start noise reduction on a call.