java

Cheetah Speech-to-Text Demos

Made in Vancouver, Canada by Picovoice

Cheetah

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

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

Compatibility

• Java 11+
• Runs on Linux (x86_64), macOS (x86_64, arm64), Windows (x86_64), Raspberry Pi (3, 4, 5), and NVIDIA Jetson Nano.

Installation

Build the demo jars with Gradle:

cd cheetah/demo/java
./gradlew build

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

Navigate to the output directory to use the demos:

cd cheetah/demo/java/build/libs

File Demo

The file demo uses Cheetah to get speech-to-text results from an audio file. This demo is mainly useful for quantitative performance benchmarking against a corpus of audio data.

java -jar cheetah-file-demo.jar -a ${ACCESS_KEY} -i ${AUDIO_PATH}

Microphone Demo

The microphone demo opens an audio stream from a microphone and performs live speech-to-text:

java -jar cheetah-mic-demo.jar -a ${ACCESS_KEY}

It is possible that the default audio input device is not the one you wish to use. There are a couple of debugging facilities baked into the demo application to solve this. First, type the following into the console:

java -jar cheetah-mic-demo.jar -sd

It provides information about various audio input devices on the box. On a Windows PC, this is the output:

Available input devices:

    Device 0: Microphone Array (Realtek(R) Au
    Device 1: Microphone Headset USB

You can use the device index to specify which microphone to use for the demo. For instance, if you want to use the Headset microphone in the above example, you can invoke the demo application as below:

java -jar cheetah-mic-demo.jar -a ${ACCESS_KEY} -di 1

If the problem persists we suggest storing the recorded audio into a file for inspection. This can be achieved with:

java -jar cheetah-mic-demo.jar -a ${ACCESS_KEY} -di 1 -o ./test.wav

If after listening to stored file there is no apparent problem detected, please open an issue.