Audio Annotation Services

Crystal-Clear Speech & Sound Labels

Crystal-Clear Speech & Sound Labels

High-quality audio transcription, labelling, and annotation for conversational AI, voice assistants, call analytics, and speech recognition model training.

Audio Annotation Services

  • Speech transcription (verbatim & clean)
  • Speaker diarisation & identification
  • Emotion & sentiment tagging in audio
  • Sound event detection & classification
  • Noise labelling & acoustic environment tagging
  • Multi-language & dialect annotation (30+ languages)

Why Choose Our Audio Annotation Services?

Certified Experts

Industry-certified professionals with deep domain expertise delivering consistently high-quality results.

Fast Turnaround

Flexible SLAs with express delivery options — 24/7 operations ensure your deadlines are always met.

ISO 27001 Secure

Your data is protected with enterprise-grade security, NDAs, and strict access control protocols.

Cost-Effective

Reduce operational costs by 40–60% compared to in-house teams without sacrificing quality.

500
Projects Delivered
98
% Accuracy Rate
150
Global Clients
24
7 Support

Frequently Asked Questions

We support WAV, MP3, FLAC, AAC, OGG, and M4A. We can also process audio extracted from video files.
We use a combination of automated transcription + human review to achieve 98%+ accuracy, with a dedicated QA pass.

Industries We Serve

Our Audio Annotation Services solutions are tailored for diverse industries across India, USA, UK, Australia and beyond.

Speech Recognition
Call Centres
Smart Speakers
Healthcare AI
Automotive Voice
E-Learning
Media
Security
Telecom
Consumer Electronics

How It Works

A structured, transparent process that ensures quality, speed and complete client satisfaction.

01
Audio Dataset Receipt
Step 1 of the Audio Annotation Services delivery process.
02
Transcription
Step 2 of the Audio Annotation Services delivery process.
03
Speaker Diarisation
Step 3 of the Audio Annotation Services delivery process.
04
Emotion & Intent Tagging
Step 4 of the Audio Annotation Services delivery process.
05
QA Playback Review
Step 5 of the Audio Annotation Services delivery process.
06
Annotated Dataset Delivery
Step 6 of the Audio Annotation Services delivery process.

Word Error Rate on our ASR dropped significantly after training on Vortexsoft-annotated data.

C
Carlos M., Speech AI Researcher
Vortexsoft Client

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