Sound

Noise gate for voice recordings

Close the microphone between phrases, so room noise drops away in the pauses.

Shown on A narration recorded beside a river

Before · the same request without it
After · Close the microphone when nobody is speaking, so the river drops away before and after the voice.
Transcript

High above the city, on a tall column, stood the statue of the Happy Prince. He was gilded all over with thin leaves of fine gold.

The entry

Add it to a clip's effects list. Entries run in the order you write them.

{
  "type": "gate"
}

Settings

NameAcceptsDefaultWhat it does
threshold-70 to 20 dB-30Sound quieter than this is turned down, in decibels. Set it just above the noise.

Run it

The whole request behind the render above. Paste it as it is, or swap the file for your own.

job.ts
import { createClient, outputUrl } from "@rendobar/sdk";


const rb = createClient({ apiKey: process.env.RENDOBAR_API_KEY });


const job = await rb.jobs.run({
  type: "compose",
  params: {
    schemaVersion: 1,
    output: {
      format: "mp3"
    },
    timeline: {
      tracks: [
        {
          clips: [
            {
              asset: {
                type: "audio",
                src: "https://cdn.rendobar.com/compose/showcase/media/narration-noisy.wav"
              },
              start: 0,
              effects: [
                {
                  type: "gate"
                }
              ]
            }
          ]
        }
      ]
    }
  },
});


console.log(outputUrl(job));

Install with npm i @rendobar/sdk. jobs.run() submits and waits, so it returns the finished job in one call.

terminal
curl https://api.rendobar.com/jobs \
  -H "Authorization: Bearer $RENDOBAR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"type":"compose","params":{"schemaVersion":1,"output":{"format":"mp3"},"timeline":{"tracks":[{"clips":[{"asset":{"type":"audio","src":"https://cdn.rendobar.com/compose/showcase/media/narration-noisy.wav"},"start":0,"effects":[{"type":"gate"}]}]}]}}}'

Returns immediately with a job id. Poll GET /jobs/{id} or register a webhook rather than blocking on the request.

Questions

What does the gate effect do in compose?

Close the microphone between phrases, so room noise drops away in the pauses. Close the microphone when nobody is speaking, so the river drops away before and after the voice.

How do I add noise gate to a video with an API?

Send a compose job to the Rendobar API with this entry in the timeline: {"type":"gate"}. Add it to a clip's effects list. Entries run in the order you write them. The request on this page is complete and renders as shown.

What are the default settings for noise gate?

Every setting has a default, so the type on its own is enough: threshold -30. Set only the ones you want to change.

Footage and sound

More in the reference

EQ More low end and more sparkle on a music bed. Compressor Even out a voice so quiet words and loud words sit at one level. Limiter Make music louder without letting the peaks clip. High pass Cut the rumble under a voice. Wind, traffic and water live there. Low pass Music from the next room. Loudness Bring a voice recorded far too quietly up to a streaming loudness.

See all 77 in the effects reference →