用多角色语音框架让AI模拟印度五种语言律师的辩护语气。
Synthesizing the Virtual Advocate: A Multi-Persona Speech Generation Framework for Diverse Linguistic Jurisdictions in Indic Languages
- 通过提示工程激活Gemini模型多语言能力，生成不同律师人格化语音。
- 在泰米尔、泰卢固、孟加拉、印地、古吉拉特语中实现语音合成，但孟加拉和古吉拉特语表现较弱。
- 适合法律AI语音系统研发者与多语言语音合成研究者参考。
法律辩护需要权威语调、强调性停顿和情感智能的结合。本研究评估Gemini 2.5 Flash TTS与Gemini 2.5 Pro TTS在泰米尔、泰卢固、孟加拉、印地、古吉拉特五种印地语系语言中生成虚拟法庭陈述的表现。提出一种提示框架，利用Gemini 2.5对五种语言的原生支持及其上下文感知节奏能力，生成不同的律师人物角色。随着大语言模型的发展，文本转语音技术已从基本可懂转向情境化、富有表现力的合成。在法律领域，合成语音需传达权威与特定职业身份，这在印度的语言多样性背景下尤为复杂。实验显示模型呈现‘单调权威’特征：擅长传递程序性信息，但在动态声调调节和情感深度方面表现不足。孟加拉语与古吉拉特语性能下降，凸显未来需突破的音系边界。研究证明多语言语音合成已具备处理程序性法律任务的能力，但仍面临复制人类律师说服艺术的挑战。代码已开源。
原文摘要 · Abstract (English)
Legal advocacy requires a unique combination of authoritative tone, rhythmic pausing for emphasis, and emotional intelligence. This study investigates the performance of the Gemini 2.5 Flash TTS and Gemini 2.5 Pro TTS models in generating synthetic courtroom speeches across five Indic languages: Tamil, Telugu, Bengali, Hindi, and Gujarati. We propose a prompting framework that utilizes Gemini 2.5s native support for 5 languages and its context-aware pacing to produce distinct advocate personas. The evolution of Large Language Models (LLMs) has shifted the focus of TexttoSpeech (TTS) technology from basic intelligibility to context-aware, expressive synthesis. In the legal domain, synthetic speech must convey authority and a specific professional persona a task that becomes significantly more complex in the linguistically diverse landscape of India. The models exhibit a "monotone authority," excelling at procedural information delivery but struggling with the dynamic vocal modulation and emotive gravitas required for persuasive advocacy. Performance dips in Bengali and Gujarati further highlight phonological frontiers for future refinement. This research underscores the readiness of multilingual TTS for procedural legal tasks while identifying the remaining challenges in replicating the persuasive artistry of human legal discourse. The code is available at-https://github.com/naturenurtureelite/Synthesizing-the-Virtual-Advocate/tree/main
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