js

Prerequisites

The binding assumes that the Porcupine's WebAssembly library is already loaded.

Binding Class

Create a new instance of engine using

let obj = Porcupine.create(keywordIDs, sensitivities)

keywordIDs is an array of keyword signatures to be detected. Each signature is an array of 8-bit unsigned integers (i.e. UInt8Array). A number of signatures are available for free under resource folder and also within demo file.

sensitivities is an array of 32-bit floating point numbers (i.e. Float32Array) each value is the detection sensitivity for each keyword to be detected. A higher sensitivity results in lower miss rate at the cost of higher false alarm rate. Sensitivity values are within [0, 1]. For more details you can refer to the comments in C library's header file.

When instantiated Porcupine can process audio via its .process method. When done be sure to release resources acquired by WebAssembly using .release.

    While (true) {
        let keywordIndex obj.process(audioFrameInt16Array);
    }
    
    obj.release();

audioFrameInt16Array is an array of audio samples in 16-bit format. The length of array can be retrieved using obj.frameLength and the required sample rate using obj.sampleRate.

For a working example refer to demo.