Traditional voice activity detection (VAD) solutions like Silero VAD often fall short in real-time Voice AI and Voice Agent pipelines. They tend to struggle for example with sudden and dynamic noise types, background music or reverberant rooms and typically require extra pre-processing steps, such as denoising with tools like Krisp, to perform reliably – adding cost, latency and complexity to the pipeline.
Our new Quail VAD model solves this problem.
Performance in real-world environments
Real-world audio presents complex, unpredictable noise – a challenge where the ai-coustics VAD excels. Across the samples below (‘Construction Site’, ‘Background Music’ and ‘Train Station’), the Silero VAD fails to detect speech reliably, missing segments in the first and completely failing in the other two samples. In contrast, the ai-coustics VAD accurately detects speech.
Built directly into the ai-coustics SDK, it’s designed to work without separate de-noising, leveraging the real-time audio enhancement technology powering Quail, to deliver accurate speech detection even in challenging acoustic conditions.
The result: faster, cleaner, and more responsive performance for voice agents, live conferencing, and streaming applications, without the need for preprocessing.
Supporting natural conversation flow
Voice Activity Detection (VAD) determines whether a segment of audio contains speech or not. It helps systems identify when a speaker begins and ends talking – making it easier to manage turn-taking and conversation flow.
Key benefits of the new VAD module:
- Reliable detection: Accurately identifies speech segments in complex acoustic environments, maintaining consistent performance even with low signal-to-noise ratios or background interference.
- Modular and efficient: Fully compatible with Quail’s speech enhancement models and integrated directly into the SDK, VAD adds minimal processing overhead.
- Easy deployment: Runs within ai-coustics’ lightweight Rust SDK – no additional dependencies like Torch or ONNX required.
- All-in-one: A single SDK to handle detection, enhancement and integration – everything needed for real-time audio processing in one package.
In addition, Quail VAD offers a useful blend of customization and easy input, with two tuneable parameters that allow you to adjust the sensitivity and latency to individual use cases.
How does Quail VAD perform?
We tested the new Quail VAD against the classic Silero VAD that most voice agents use.
The ai-coustics VAD demonstrates superior performance across key metrics, including F1 Score and Balanced Accuracy, when evaluated on the MSDWild dataset. This dataset was chosen for its realistic acoustic conditions and high background noise, providing a challenging and representative benchmark for voice agent applications.
What does that mean for your voice agent?
- Increased ASR (Automatic Speech Recognition) quality: By precisely detecting when speech starts and stops, the Quail VAD model helps ASR systems focus only on the relevant segments – reducing false transcriptions and improving overall recognition quality.
- Improved turn-taking: VAD output often serves as an input to turn-taking models. The more accurate the VAD, the better a system can handle conversational timing and speaker transitions.
- Lightweight performance: The Quail VAD adds only a minimal processing overhead. It’s designed to run efficiently without noticeably increasing CPU load.
Try the ai-coustics SDK today
If you’re already using Quail for speech enhancement, the new Quail VAD model integrates seamlessly: delivering advanced speech detection with negligible impact on performance.
Ready to experience real-time voice enhancement with integrated VAD? Get in touch for a personalized demo, or sign up to our developer platform to obtain your SDK key. You can then clone or download the SDK code from our GitHub repository to start testing it locally.
