AI4Bharat and Hugging Face Released Indic Parler-TTS: A Multimodal Text-to-Speech Technology for Multilingual Inclusivity and Bridging India’s Linguistic Digital Divide

AI4Bharat and Hugging Face have unveiled the Indic-Parler Text-to-Speech (TTS) system, an initiative designed to advance linguistic inclusivity in AI. This development is an effort to bridge the digital divide in a linguistically diverse country like India. Indic Parler-TTS represents a synthesis of cutting-edge technology and cultural preservation to empower users to access digital tools in multiple Indian languages.

The Indic-Parler TTS system is a multilingual text-to-speech technology designed to address India’s rich linguistic diversity. Supporting 21 languages, including Hindi, Bengali, Tamil, Telugu, and Marathi, alongside English, the model is built on a robust dataset of over 1,800 hours of speech data. It offers 69 unique voices tailored to provide naturalness and clarity. It integrates advanced features such as emotion rendering, accent flexibility for Indian English, and customizable attributes like pitch, speaking rate, background noise, and reverberation. These features allow the system to produce highly expressive, natural-sounding speech outputs, while its modular design ensures adaptability to linguistic and cultural nuances.

The system’s foundation lies in extensive datasets from initiatives such as IndicTTS and LIMMITS, covering 16 official Indian languages and others like Chhattisgarhi. This diversity ensures reliable performance even for lesser-resourced languages like Bodo and Maithili. Its evaluation scores highlight near-perfect synthesis for Sanskrit and impressive accuracy for Manipuri, Odia, and Kannada. Also, its open-access model under the Apache 2.0 license democratizes cutting-edge technology, enabling developers and researchers to innovate and expand its use. Indic-Parler TTS advances digital inclusivity by providing free and transparent access.

Indic Parler-TTS’s core is its ability to generate high-quality, natural-sounding speech in various Indian languages. This capability addresses a critical gap in technology accessibility for non-English speakers, who form a significant portion of the population. The system’s design is tailored to handle the phonetic complexities and unique linguistic characteristics of Indian languages. One major challenge in developing a TTS system for Indian languages is the diversity of phonetic and syntactic structures. Unlike many Western languages, Indian languages often exhibit a rich array of regional dialects, tonal variations, and cultural nuances. Indic Parler-TTS incorporates these intricacies into its framework, ensuring the output resonates with native speakers. Doing so improves the tool’s usability and fosters a sense of cultural pride and preservation among users.

Key features of Indic Parler-TTS are as follows:

• Language Support: Indic Parler-TTS officially supports 21 languages, including Assamese, Bengali, Bodo, Dogri, Kannada, Malayalam, Marathi, Sanskrit, Nepali, English, Telugu, Hindi, Gujarati, Konkani, Maithili, Manipuri, Odia, Santali, Sindhi, Tamil, and Urdu, with unofficial support for Chhattisgarhi, Kashmiri, and Punjabi.  
• Speaker Diversity: The system features 69 unique voices across its supported languages, with each language offering a set of recommended voices optimized for naturalness and intelligibility to enhance user experience.  
• Emotion Rendering: Emotion-specific prompts are officially supported in 10 languages, Assamese, Bengali, Bodo, Dogri, Kannada, Malayalam, Marathi, Sanskrit, Nepali, and Tamil, with emotions such as Command, Anger, Narration, Disgust, Happy, Sad, and Surprise, though testing for other languages is limited.  
• Accent Flexibility: Indian English accents are officially supported with clear and natural outputs, while other accents, such as British or American, can be customized using style transfer for personalized and dynamic speech synthesis.  
• Customizable Output: The system allows fine control over speech characteristics, including background noise, reverberation, expressivity, pitch, speaking rate, and voice quality. Thus, users can tailor audio outputs from highly expressive and dynamic to monotone and refined.  

In conclusion, the Indic-Parler TTS system is a multilingual AI tool supporting 21 languages, including Hindi, Bengali, Tamil, Telugu, and Marathi, with over 1,800 hours of training data. It delivers natural and expressive outputs with 69 unique voices and advanced features like emotion rendering, accent flexibility, and customizable speech attributes. It bridges linguistic gaps in underserved communities with near-perfect synthesis for Sanskrit and high accuracy for Manipuri, Bodo, and Kannada. Its open-access Apache 2.0 license fosters innovation and is a transformative step in preserving linguistic diversity and advancing AI inclusivity in India.

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