Audio Transcription & Annotation Services
Human-verified speech-to-text, speaker diarization, and acoustic event labeling.
VAIKA GROUP provides professional audio transcription and audio annotation services to transform speech recordings and acoustic data into structured, searchable and machine-readable datasets.
Our workflows combine human-verified speech-to-text transcription with detailed acoustic event labeling, speaker diarization, timestamp annotation, language identification and speech emotion classification.
We support interviews, conference recordings, business meetings, earnings calls, customer conversations, voice assistant recordings and environmental audio datasets.
Why Organizations Outsource Audio Transcription & Annotation Services
Corrects automatic speech recognition (ASR) errors on accented, noisy, or overlapping multi-speaker audio and enriches sound files with acoustic context.
Our 8-Step Production Process
Structured guidelines, trained human operators, and multi-stage verification ensure predictable throughput at any dataset scale.
Audio Assessment
Evaluate recording quality, language, speaker count, background noise and transcription requirements.
Speech-to-Text Transcription
Convert audio recordings into accurate written transcripts using verbatim or clean-read transcription according to project requirements.
Speaker Diarization
Identify individual speakers and assign consistent speaker labels throughout the recording.
Timestamp Annotation
Add precise timestamps to words, phrases, speaker turns and important acoustic events.
Audio Event Labeling
Identify and classify environmental sounds such as sirens, footsteps, engines, alarms and background noise.
Speech & Emotion Annotation
Label speech tone, emotion, prosody, wake words, keywords and language-specific characteristics.
Language & Dialect Identification
Categorize language, accent and dialect information where required.
Human Quality Review
Verify transcripts, speaker identification, terminology, timestamps and annotation consistency.
Key Capabilities Included
Deliverables & Formats
- TXT, DOCX and JSON transcripts
- Timestamped SRT and VTT subtitle files
- Speaker diarization datasets
- Segmented audio annotation files
- Acoustic event and classification metadata
Primary Use Cases & Sectors
Speech-to-Text Transcription • Audio Labeling • Speaker Diarization • Audio Transcription with Timestamps • Speech Emotion Annotation • Voice Data Annotation • Acoustic Event Detection
Verification & Consistency Controls
Human reviewers verify every transcript against source audio waveforms, auditing speaker turn boundaries, regional dialects, domain terminology, and millisecond timestamps.
Frequently Asked Questions
Scope Your Audio Transcription & Annotation Services Project
Share your dataset format, volume, or back-office requirements. Our Data & AI Core engineering lead responds within one business day with a pilot plan.