What is Audio Classification?

Audio classification, sometimes called sound classification, is the process of listening to and analyzing an audio recording. Human annotators determine its content and classify it into a series of predetermined categories. Audio classification is used in numerous natural language processing applications like chatbots, automatic speech recognition, text to speech, and more.

At Lionbridge, we can leverage our global crowd of expert annotators to both collect audio samples and classify them into the categories you require.

Why use Lionbridge for Audio Classification?

Whether you’re looking for annotated audio data to train your model, a platform to annotate your audio data or require a team of qualified workers to classify your audio for you, Lionbridge is your home for audio classification outsourcing.


Our established quality assurance system features built-in validation, spot-checking, regular performance evaluations, and a worker seniority system to ensure the highest quality of data production.

Multilingual Experts

With a specialization in linguistics, Lionbridge is a leading audio classification company. Our curated crowd can accurately label and categorize your audio in the language of your choice from one of our 300 supported languages.

Customizable Workflows

Need things done in a specific way under strict guidelines? We can work with you to make sure our team of experts gets your project done within your requirements and timeline.

1 million+ Contributors
300+ Languages
20+ Years of Experience

Our Audio Classification Services

Acoustic Data Collection and Classification

At Lionbridge, we can record acoustic scenes and audio events in professional studios.

We can also record audio in restaurants, schools, homes, offices, streets, train stations, and airports in various countries and languages.

Customer Service and Sales Call Evaluations

We analyze and classify recordings of customer service calls and sales calls. Our workers evaluate the calls and categorize them based on the standards of performance you wish to evaluate your staff.

Environmental Sound Classification

The classification of audio recordings of common sounds and background noises found in various environments.

Ex: urban sounds, meeting rooms, sporting events

Music Classification

The categorization of music recordings based on genre, instruments used, and other categories.

Natural Language Utterance Classification

We classify natural language recordings based on language spoken, dialect, semantics, and other features.

How it Works

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

Success Stories


Audio Classification Services Pricing

The Lionbridge platform streamlines much of the audio classification process, allowing us to offer the most cost-effective solutions 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 Classification Services

Lionbridge provides professional audio classification services in over 300 languages. Some of our most popular languages include:

  • Chinese audio classification
  • Dutch audio classification
  • French audio classification
  • German audio classification
  • Italian audio classification
  • Japanese audio classification
  • Portuguese audio classification
  • Spanish audio classification

Related Services

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