This paper presents the submission of the Jadavpur University Computer Science and Engineering Natural Language Processing (JU-CSENLP) Laboratory to the International Conference on Spoken Language Translation (IWSLT) 2025 Indic track, addressing the speech-to-text translation task in both English-to-Indic (Bengali, Hindi, Tamil) and Indic-to-English directions. To tackle the challenges posed by low resource Indian languages, we adopt a cascaded approach leveraging state-of-the-art pre-trained models. For English-to-Indic translation, we utilize OpenAI’s Whisper model for Automatic Speech Recognition (ASR), followed by the Meta’s No Language Left Behind (NLLB)-200-distilled-600M model finetuned for Machine Translation (MT). For the reverse direction, we employ the AI4Bharat’s IndicConformer model for ASR and IndicTrans2 finetuned for MT. Our models are fine-tuned on the provided benchmark dataset to better handle the linguistic diversity and domain-specific variations inherent in the data. Evaluation results demonstrate that our cascaded systems achieve competitive performance, with notable BLEU and chrF++ scores across all language pairs. Our findings highlight the effectiveness of combining robust ASR and MT components in a cascaded pipeline, particularly for low-resource and morphologically rich Indian languages.

This work explores the intersection of code-mixing and disfluency in bilingual speech and text, with a focus on understanding how large language models (LLMs) handle code-mixed disfluent utterances. One of the primary objectives is to explore LLMs’ ability to generate code-mixed disfluent sentences and to address the lack of high-quality code-mixed disfluent corpora, particularly for Indic languages. We aim to compare the performance of LLM-based approaches with traditional disfluency detection methods and to develop novel metrics for quantitatively assessing disfluency phenomena. Additionally, we investigate the relationship between code-mixing and disfluency, exploring how factors such as switching frequency and direction influence the occurrence of disfluencies. By analyzing these intriguing dynamics, we seek to gain a deeper understanding of the mutual influence between code-mixing and disfluency in multilingual speech.