Speaker Diarisation · മലയാളം
Malayalam Data for Speaker Diarisation
Determining who spoke when in multi-party Indian-language audio, including overlapped speech. In Malayalam, the binding constraint is usually dialect coverage and code-mixing, not raw hours.
- Language
- Malayalam
- Primary metric
- Diarisation error rate
- Typical volume
- 100-500 hours
Data profile required
- Per-speaker isolated channels with a mixed reference
- Genuine overlap preserved
- Turn-level ground truth
What Malayalam adds to the requirement
- One of the most consonant-dense Indian languages; long geminates and clusters raise word error rates sharply
- Very high speech rate compared with other Indian languages, which stresses streaming ASR
- Dialects to cover: Thiruvananthapuram, Kochi (central), Malabar / Kozhikode, Thrissur
- Manglish is standard in urban and professional speech, with heavy English noun and verb insertion.
Metrics to track
- Diarisation error rate
- Overlap detection recall
- Speaker-count accuracy
Failure modes
- Overlap edited out during recording
- Single-channel-only capture leaving no reliable ground truth
For Malayalam specifically: Central Kerala news-reading dominates public data. Malabar and southern varieties, and fast conversational speech generally, are missing.
Recommended cohort
Budget higher transcription effort per audio hour for Malayalam than for Hindi; speech rate and morphology make it slower to annotate.
| Dimension | Typical split | Why it matters for Malayalam |
|---|---|---|
| Gender | 50 / 50 | Pitch range differences change acoustic model behaviour; unbalanced cohorts bias recognition |
| Age | 18-25: 30%, 26-40: 40%, 41-60: 30% | Older speakers retain conservative Malayalam forms that younger urban speakers have lost |
| Region | Kerala / Lakshadweep / Puducherry (Mahe) and others | Dialect spread across 5 recognised varieties |
| Education | Mixed, including below-graduate | Prompt-reading fluency correlates with education and skews prosody |
| Condition | Studio / quiet room / field | Match the noise profile of your deployment |
Suggested programme shape
Start with an evaluation set of 100 speakers spread across every Malayalam dialect in scope, collected before training data. Then field 100-500 hours of training data from disjoint speakers.
This ordering is what makes the improvement measurable rather than assumed.
Frequently asked
Is there usable public Malayalam data for speaker diarisation?
Central Kerala news-reading dominates public data. Malabar and southern varieties, and fast conversational speech generally, are missing.
How many Malayalam speakers do we need?
300-800 speakers for a training corpus, plus a disjoint evaluation cohort covering each dialect. Speaker count matters more than hours for generalisation.
Can you run this across multiple languages at once?
Yes. Multi-language programmes run to one master specification so per-language results stay comparable.
Scope Malayalam data for speaker diarisation
Send the target metric and the languages in scope.