@picovoice/picovoice-node

Picovoice

Made in Vancouver, Canada by Picovoice

Picovoice is an end-to-end platform for building voice products on your terms. It enables creating voice experiences similar to Alexa and Google, but it runs entirely on-device. Picovoice is:

• Private: Everything is processed offline. Intrinsically HIPAA and GDPR-compliant.
• Reliable: Runs without needing constant connectivity.
• Zero Latency: Edge-first architecture eliminates unpredictable network delay.
• Accurate: Resilient to noise and reverberation. It outperforms cloud-based alternatives by wide margins *.
• Cross-Platform: Design once, deploy anywhere. Build using familiar languages and frameworks.

See the Picovoice Docs for additional details.

Compatibility

This binding is for running Picovoice on NodeJS 16+ on the following platforms:

• Windows (x86_64)
• Linux (x86_64)
• macOS (x86_64, arm64)
• Raspberry Pi (3, 4, 5)

Web Browsers

This binding is for NodeJS and does not work in a browser. Looking to run Picovoice in-browser? There are npm packages available for Web, and dedicated packages for Angular, React, and Vue.

AccessKey

Picovoice requires a valid Picovoice AccessKey at initialization. AccessKey acts as your credentials when using Picovoice 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.

Installation

The Picovoice SDK for NodeJS is available from npm:

yarn add @picovoice/picovoice-node

(or)

npm install @picovoice/picovoice-node

Usage

The SDK provides the Picovoice class. Create an instance of this class using a Porcupine keyword and Rhino context file, as well as callback functions that will be invoked on wake word and inference events, respectively:

const Picovoice = require("@picovoice/picovoice-node");

const accessKey = "${ACCESS_KEY}" // Obtained from the Picovoice Console (https://console.picovoice.ai/)

const keywordCallback = function (keyword) {
  console.log(`Wake word detected`);
};

const inferenceCallback = function (inference) {
  console.log("Inference:");
  console.log(JSON.stringify(inference, null, 4));
};

const handle = new Picovoice(
  accessKey,
  keywordArgument,
  keywordCallback,
  contextPath,
  inferenceCallback
);

The keywordArgument can either be a path to a Porcupine keyword file (.ppn), or one of the built-in keywords (integer enums). The contextPath is the path to the Rhino context file (.rhn).

Upon constructing the Picovoice class, send it frames of audio via its process method. Internally, Picovoice will switch between wake word detection and inference. The Picovoice class includes frameLength and sampleRate properties for the format of audio required.

// process audio frames that match the Picovoice requirements (16-bit linear pcm audio, single-channel)
while (true) {
  handle.process(frameOfAudio);
}

As the audio is processed through the Picovoice engines, the callbacks will fire. This is the output when we provide the built-in "picovoice" keyword and sample "coffee maker" context to the Picovoice class, and then provide it a test WAV file that contains the following utterance:

"Picovoice, make me a large coffee"

Wake word detected

Inference:
{
    "isUnderstood": true,
    "intent": "orderDrink",
    "slots": {
        "size": "large",
        "coffeeDrink": "coffee"
    }
}

Porcupine and Rhino

The Picovoice SDK for NodeJS is built on top of the Porcupine and Rhino NodeJS bindings. If you wish to use these engines individually for wake word or inference, see the Porcupine and Rhino NPM packages, respectively.