---
title: "From LLM Prompts to Acoustic Baselines — Mitra 2026"
description: "ASR systems for South Asian languages are rarely trained on audio that reflects real conversation, where speakers switch between their native language…"
authors: ["Anuran Mitra", "Anirvan Chakravarty", "Tapabrata Mondal", "Sivaji Bandyopadhyay"]
year: 2026
venue: "Proceedings of the SIGUL 2026 Joint Workshop with ELE, EURALI, and DCLRL: Towards Inclusivity and Equality: Language Resources and Technologies for Under-Resourced and Endangered Languages"
source: "https://aclanthology.org/2026.sigul-1.22/"
doi: "10.63317/5k9xcfdyrtev"
licence: "CC BY-NC 4.0 (ELRA, LREC proceedings)"
licence_url: "https://creativecommons.org/licenses/by-nc/4.0/"
summary_licence: "Elamur Cosmic License"
canonical: "https://research.elamur.ai/free/papers/mitra-2026-llm-prompts-acoustic-baselines-scalable/"
---
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# From LLM Prompts to Acoustic Baselines: A Scalable Pipeline for Under-Resourced Disfluent Code-Mixed Speech

**Authors:** Anuran Mitra, Anirvan Chakravarty, Tapabrata Mondal, Sivaji Bandyopadhyay · **Year:** 2026 · **Venue:** Proceedings of the SIGUL 2026 Joint Workshop with ELE, EURALI, and DCLRL: Towards Inclusivity and Equality: Language Resources and Technologies for Under-Resourced and Endangered Languages · **Licence:** [CC BY-NC 4.0 (ELRA, LREC proceedings)](https://creativecommons.org/licenses/by-nc/4.0/)

**Links:** [Publisher's page](https://aclanthology.org/2026.sigul-1.22/) · [PDF](https://aclanthology.org/2026.sigul-1.22.pdf) · [DOI 10.63317/5k9xcfdyrtev](https://doi.org/10.63317/5k9xcfdyrtev) · [OpenAlex](https://openalex.org/W7166590723)

**Citations:** 0 citations (openalex-snapshot · 2026-10-14)

## Summary

ASR systems for South Asian languages are rarely trained on audio that reflects real conversation, where speakers switch between their native language and English mid-sentence and also hesitate, repeat words or restart. Collecting and transcribing such speech is expensive. The authors therefore build BEHE-CMDisfl, a fully synthetic corpus of Bengali–English and Hindi–English conversational speech. Structured ChatGPT prompts fix speaker roles, topic, degree of code-mixing and disfluency rate, and the resulting dialogues are voiced with Indic Parler TTS. The corpus is tested on about 1.3 hours of Bengali–English audio with two ASR approaches. A Kaldi GMM-HMM system reaches 37.74% WER after phonetic normalization reduces transliteration variation, and it keeps disfluency tokens in its output. openai/whisper-small fails in zero-shot mode, hallucinating and looping. After brief LoRA fine-tuning it decodes stably and reaches 21.37% WER. The work offers a cheap, language-adaptable recipe for bootstrapping ASR in micro-resource code-mixed settings, although results on real speech have not yet been reported.

## Key points

- **Corpus and pipeline:** BEHE-CMDisfl covers Bengali–English and Hindi–English, with Bengali or Hindi as the matrix language and English embedded.
  - Text comes from zero- and few-shot ChatGPT prompting; audio comes from Indic Parler TTS.
  - Prompts request filled pauses, repetitions and restarts in roughly 15–25% of utterances.
- **Domains:** everyday chat, customer-service dialogs, classroom talk, healthcare/teleconsultation, and social-media-style sports and entertainment commentary.
- **Kaldi GMM-HMM baseline (~1.3 h Bengali–English):** 37.74% WER after phonetic normalization, with disfluency markers retained as lexical units.
- **Whisper adaptation:** zero-shot openai/whisper-small hallucinated heavily and failed to emit end-of-sequence tokens. LoRA fine-tuning for 1,000 steps brought WER to 21.37% and improved recognition of rapid language switching.
- **Limitations and future work:**
  - Evaluation is synthetic only; a 3–5 hour real-speech test set is planned.
  - The Hindi–English subset has not yet been tested for ASR.
  - Planned extensions include Wav2Vec2 adaptation and Tamil and Marathi.

*Our summary of the paper, in our own words — not its text. The work belongs to its authors; read it at the links above.*

Fields: [Linguistics & languages](https://md.research.elamur.ai/free/shelves/linguistics/)

## Cite

The paper itself, not this page. BibTeX from the library's record of the work.

```bibtex
@inproceedings{mitra2026llm,
  title = {{From LLM Prompts to Acoustic Baselines: A Scalable Pipeline for Under-Resourced Disfluent Code-Mixed Speech}},
  author = {Mitra, Anuran and Chakravarty, Anirvan and Mondal, Tapabrata and Bandyopadhyay, Sivaji},
  booktitle = {Proceedings of the SIGUL 2026 Joint Workshop with ELE, EURALI, and DCLRL: Towards Inclusivity and Equality: Language Resources and Technologies for Under-Resourced and Endangered Languages},
  year = {2026},
  doi = {10.63317/5k9xcfdyrtev},
  url = {https://doi.org/10.63317/5k9xcfdyrtev}
}
```

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