What is Audio Data Collection?

Audio data collection describes the process of gathering and measuring audio data from a variety of sources. In order for virtual assistants and automatic speech recognition (ASR) systems to recognize human speech, they need to first be exposed to large quantities of high-quality audio data.

While the human brain can process a wide range of sounds effortlessly, teaching a machine to recognize audio input is a much more arduous task. All audio-based machine learning systems rely on a foundation of relevant and diverse audio training data in order to function correctly. Lionbridge collects audio data to develop, calibrate, and improve voice-enabled applications for the world’s largest corporations. Working with Lionbridge unlocks access to a network of 500,000+ qualified linguists, in-country speakers, and experienced project managers capable of collecting audio data for a range of use cases.

Why Lionbridge?


Whether you’re looking for professionally recorded speech data, a platform to annotate audio data, or require a crowd to test your system, Lionbridge is your home for audio data outsourcing.

  • 500,000+ Contributors
  • 300+ Languages
  • 20+ Years of experience


The Lionbridge quality assurance system features built-in validation, spot-checking and a worker seniority system to ensure the highest quality data to train machine learning applications.


Lionbridge has access to a global network of 500,000+ qualified contributors, allowing clients to quickly generate custom audio datasets in over 300+ languages and dialects.


With over 20 years of hands-on experience collecting audio data for machine learning use cases, Lionbridge has gained the trust of the world’s largest corporations.


Our Audio Data Collection Services

Speech Data Collection

Lionbridge collects speech data across all major languages and dialects, accents, regions and voice types. We offer multiple levels of service depending on client needs, from collecting remote voice samples from thousands of speakers to conducting top-notch professional studio recordings.

Acoustic Data Collection

Lionbridge records acoustic scenes and audio events in professional studios, through our network of in-country collectors or our dedicated data collection project managers. We can conduct local recordings in restaurants, schools, homes, offices, streets, train stations, airports and more to collect audio data from various environments and languages. A foundation of diverse acoustic audio boosts your model’s audio-based context recognition and sound cancelling capabilities.

Natural Language Utterance Collection

Phonetically rich sentences are a requirement to develop applications that recognize the nuances of human speech. Lionbridge has deep experience capturing diverse natural language utterances (NLUs) to train audio-based machine learning systems. By partnering with Lionbridge, clients gain access to hundreds of thousands of local and remote speakers to record speech samples in 300+ languages and dialects.

How does Audio Data Collection with Lionbridge work?

how to crowdsource data

1. Project set-up

Our team will work with you to develop a custom solution based on your project objectives and timeline.

how to crowdsource data
how to crowdsource data

2. Production

Our crowd of multilingual experts get to work creating, annotating or validating your data.

how to crowdsource data
how to crowdsource data

3. Delivery

Our project management team checks, packages, and formats the data before being sent to you for final approval.

how to crowdsource data

Speech Data Collection Case Study

Learn how we helped one of the world’s largest technology companies train its voice-based search engine to be fluent in 30 languages.

  • 240 Hours of high-quality ambient noise
  • 20 Hours of speech samples
  • 30 Languages
  • Speakers Ages 6-75


Lionbridge can Improve

Automatic Speech Recognition (ASR)

Improve accuracy for automatic speech recognition systems using labeled speech data produced by a diverse set of speakers.

Virtual Assistants

Train your virtual assistant to recognize and respond to human speech in a variety of languages, environments and contexts.

Text-to-Speech (TTS)

Build a text-to-speech system that can generate realistic speech in multiple languages.


Audio Data Collection Pricing

The Lionbridge platform streamlines much of the process, allowing us to offer the most cost-effective audio data collection solution in the industry. Contact us to get a free estimate for your project.

  • Account Manager
  • Project Management
  • 24/7 Support
  • API
  • NDA
  • Volume pricing
  • Custom reporting
  • Enterprise-grade SLAs
  • Custom invoicing
  • Consulting services
Get in touch with our team today

Multilingual Audio Data Collection Services

Lionbridge provides audio data services in all major languages and dialects. We can gather audio and speech data locally and remotely, with tens to thousands of global participants. Some of our most popular languages include:

  • Chinese Audio Data Collection
  • Dutch Audio Data Collection
  • French Audio Data Collection
  • German Audio Data Collection
  • Italian Audio Data Collection
  • Japanese Audio Data Collection
  • Portuguese Audio Data Collection
  • Spanish Audio Data Collection

Check out more Audio Data Collection resources

Ivan Vulić is a Senior Research Associate at the University of Cambridge and the Senior Scientist for London-based startup PolyAI. In our interview, we discussed the importance of developing NLP in multiple languages, as well as PolyAI's recent progress towards sector-agnostic conversational models.
We’re continuing our series of articles on open datasets for machine learning. This time, we at Lionbridge AI combed the web and compiled this ultimate cheat sheet for audio datasets for machine learning.
Rather than building in-house tools and recruiting contributors themselves, many machine learning companies rely on third-party providers to help them collect speech data. In this article, we have assembled several options for outsourcing speech data collection.