pvcobra 1.2.1

Cobra voice activity detection (VAD) engine

Cobra Voice Activity Detection Engine

Made in Vancouver, Canada by Picovoice

Cobra is a highly accurate and lightweight voice activity detection (VAD) engine.

Compatibility

• Python 3.5+
• Runs on Linux (x86_64), macOS (x86_64), Windows (x86_64), Raspberry Pi, NVIDIA Jetson (Nano), and BeagleBone.

Installation

pip3 install pvcobra

AccessKey

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

import pvcobra

handle = pvcobra.create(access_key=${AccessKey})

Replace ${AccessKey} with your AccessKey obtained from Picovoice Console. handle is an instance of Cobra.

When initialized, the valid sample rate is given by handle.sample_rate. Expected frame length (number of audio samples in an input array) is handle.frame_length. The engine accepts 16-bit linearly-encoded PCM and operates on single-channel audio.

def get_next_audio_frame():
    pass

while True:
    voice_probability = handle.process(get_next_audio_frame())

When done, resources have to be released explicitly:

handle.delete()

Demos

pvcobrademo provides command-line utilities for processing real-time audio (i.e. microphone) and files using Cobra.