Web Voice Processor

Made in Vancouver, Canada by Picovoice

This is a library for real-time voice processing in web browsers.

• Uses Worker to offload compute-intensive work to background threads.
• Converts the microphone sampling rate to 16000 which is used by (almost all) voice processing engines.
• Provides a flexible interface to pass in arbitrary voice processing workers.

Compatibility

The library makes use of Web Audio API, which is supported on all modern browsers except Internet Explorer.

How to Install

npm install web-voice-processor

How to Use

Add the following to your HTML

<script src="{PATH_TO_WEB_VOICE_PROCESSOR_JS}"></script>

Replace {PATH_TO_WEB_VOICE_PROCESSOR_JS} with the path to src/web_voice_processor.js.

The library adds WebVoiceProcessor as a singleton to the global scope.

Start Processing

Start processing

window.WebVoiceProcessor.start(engines, downsamplerScript, errorCallback)

engines is a list of voice processing Workers implementing the following interface within their onmessage method

onmessage = function (e) {
    switch (e.data.command) {
        
        ...
        
        case 'process':
            process(e.data.inputFrame);
            break;
            
        ...
        
    }
};

where e.data.inputFrame is an Int16Array of 512 audio samples.

downsamplerScript is the path to downsampling_worker.js relative to HTML file.

The errorCallback is executed if audio acquisition fails.

Stop Processing

Stop processing

window.WebVoiceProcessor.stop()