abr-sdk

ABR SDK

Python bindings for the Applied Brain Research on-device speech SDK: low-latency automatic speech recognition (ASR) and text-to-speech (TTS) that run entirely on the local device, with no network calls at inference time.

This package does not contain the speech models or the native engine; it loads an ABR SDK application package that you obtain separately and drives it through a small, Pythonic API.

Full documentation: https://docs.appliedbrainresearch.com/sdk Customer portal with application packages: https://dev.appliedbrainresearch.com

Installation

Use any of the following to install abr-sdk and incorporate it into your project.

pip install abr-sdk
uv add abr-sdk

The package is dependency-free and supports Python 3.10+. To run it you also need an ABR SDK application package for your platform and a license, both provided by Applied Brain Research.

Quickstart

Activate the library once per device. This is the only step that needs network access; inference is fully offline:

abr-sdk activate path/to/library.so --key-file license.key

Recognize speech from 16 kHz mono signed-16-bit little-endian PCM. A chunk may replace trailing text, so apply each one to a running buffer:

from abr_sdk.asr import Asr, AsrChunk

buf = bytearray()

def on_chunk(chunk: AsrChunk) -> None:
    chunk.update(buf)              # apply correction in place
    print(buf.decode("utf-8"))

with Asr("path/to/libasr.so") as asr:
    while (data := audio_source.read(3200)):   # ~100 ms of PCM
        asr.push(data, on_chunk=on_chunk)
    asr.wait_for_completion()                  # flush and wait for final chunks

Synthesize speech to 16 kHz mono signed-16-bit little-endian PCM:

from abr_sdk.tts import Tts

with Tts("path/to/libtts.so") as tts:
    tts.push(b"Hello from Applied Brain Research.", on_pcm=audio_sink.write)
    tts.wait_for_completion()

See the full documentation for activation options, full end-to-end examples, and the complete API.

License

Proprietary. Copyright (c) Applied Brain Research. Use of this package and the ABR SDK libraries it loads is governed by your agreement with Applied Brain Research.