---
title: "VAD Silero"
slug: "vad-silero"
updated: 2025-12-10T09:59:11Z
published: 2025-12-10T09:59:11Z
canonical: "docs.knovvu.com/vad-silero"
---

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

# VAD Silero

### Supported Sample Rates

- 8 kHz
- 16 kHz

### Parameters

| name | description | default |
| --- | --- | --- |
| Sensitivity | The range is 0.0-1.0 inclusive, Determines the threshold of Speech Possibility. Speech Started event triggers when Speech Possibility > Sensitivity. | 0.9 |
| MaxSpeechDurationMsec | If the speech does not end after this duration it will be ended by VAD. This will be treated as a normal end of speech, and an appropriate speech-ended event will be generated. Exceeding this timeout will not generate an error. | -1 |
| PreSpeechBufferMsec | After start of speech is detected VAD rewinds and takes a little more data before the detected beginning, just in case a low energy voice happens to be there. This duration is determined by pre-speech-buffer-msec | 300 |
| PostSpeechBufferMsec | After the end of speech is detected VAD takes a little more data after the detected end just in case a low energy voice happens to be there. This duration is determined by post-speech-buffer-msec. | 300 |
| SilenceTriggerMsec | The amount of silence in milliseconds for VAD to expect in order to decide that the speech has actually ended | 400 |

### Inputs

#### Audio

Accepts audio from a single channel. Passing the audio through a VAD node before streaming to this node is recommended.

#### Events

none

### Outputs

#### Audio

After removing the silences in the input audio the remaining data is sent to output.

#### Events

| name | description |
| --- | --- |
| [Speech Started](/v1/docs/events#speech-started) | Raised once at the beginning of each piece of actual audio fragment. |
| [Speech Ended](/v1/docs/events#speech-ended) | Raised once at the end of each piece of actual audio fragment. |

### Remarks

#### Supported Flow Types

Batch, Stream

### Release History

      

****v3.7.0****

      
          

- Now Supports 16khz audio streams.

  
  

****v3.6.0****

      
       

- Introduced Node.