Cheetah Binding for Node.js

Cheetah Speech-to-Text Engine

Made in Vancouver, Canada by Picovoice

Cheetah is an on-device streaming speech-to-text engine. Cheetah is:

• Private; All voice processing runs locally.
• Accurate [1]
• Compact and Computationally-Efficient [2]
• Cross-Platform:
  • Linux (x86_64), macOS (x86_64, arm64), and Windows (x86_64)
  • Android and iOS
  • Chrome, Safari, Firefox, and Edge
  • Raspberry Pi (3, 4, 5)

Compatibility

• Node.js 16+
• Runs on Linux (x86_64), macOS (x86_64, arm64), Windows (x86_64), and Raspberry Pi (3, 4, 5).

Installation

npm install @picovoice/cheetah-node

AccessKey

Cheetah requires a valid Picovoice AccessKey at initialization. AccessKey acts as your credentials when using Cheetah SDKs. You can get your AccessKey for free. Make sure to keep your AccessKey secret. Signup or Login to Picovoice Console to get your AccessKey.

Usage

Create an instance of the engine and transcribe audio :

const {Cheetah} = require("@picovoice/cheetah-node");

const accessKey = "${ACCESS_KEY}"; // Obtained from the Picovoice Console (https://console.picovoice.ai/)
const endpointDurationSec = 2.0;
const handle = new Cheetah(accessKey);

function getNextAudioFrame() {
  // ...
  return audioFrame;
}

while (true) {
  const audioFrame = getNextAudioFrame();
  const [partialTranscript, isEndpoint] = handle.process(audioFrame);
  if (isEndpoint) {
    finalTranscript = handle.flush()
  }
}

Replace ${ACCESS_KEY} with yours obtained from Picovoice Console. Finally, when done be sure to explicitly release the resources using handle.release().

Language Model

The Cheetah Node.js SDK comes preloaded with a default English language model (.pv file). Default models for other supported languages can be found in lib/common.

Create custom language models using the Picovoice Console. Here you can train language models with custom vocabulary and boost words in the existing vocabulary.

Demos

Cheetah Node.js demo package provides command-line utilities for processing audio using cheetah.