| # LJ-TTS: A Paired Real and Synthetic Speech Dataset for Single-Speaker TTS Analysis | |
| LJ-TTS is a large-scale dataset containing **real human speech** and **synthetic speech** generated by **11 state-of-the-art text-to-speech (TTS) models**. | |
| The dataset is designed to support research in **speech synthesis**, **deepfake detection**, **speech analysis**, and **comparative evaluation of generative models** under a controlled single-speaker setting. | |
| By providing utterance-level alignment between real and synthetic samples, LJ-TTS enables fine-grained comparisons across TTS architectures, isolating synthesis differences without the confounding effect of speaker variability. | |
| The dataset supports systematic analyses across multiple dimensions, including source attribution, phoneme-level acoustic studies, and robustness evaluations of synthetic speech detectors. | |
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| ## 🌟 Key Features | |
| - **Single-speaker design** | |
| Ensures controlled comparisons without multi-speaker variation. | |
| - **Real + Synthetic speech pairs** | |
| Each utterance in the REAL folder has **corresponding synthesized versions** from all TTS systems. | |
| - **11 diverse TTS models** | |
| Spanning both **autoregressive** and **non-autoregressive** architectures. | |
| - **1:1 alignment** | |
| Matching filenames and transcriptions across real and synthetic speech enable: | |
| - deepfake detection | |
| - spoofing analysis | |
| - model source tracing | |
| - perceptual evaluation | |
| - phoneme-level studies | |
| - benchmarking and reproducible comparisons | |
| - **High-quality data** | |
| Built upon clean recordings of Linda Jonhson (LJSpeech). | |
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| ## 📁 Dataset Structure | |
| Extract `LJ-TTS.zip`. | |
| Each subfolder (real data folder, plus individual TTS folders) contains audio files with **identical filenames**, enabling direct pairing. | |
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| ## 📚 Citation | |
| If you use LJ-TTS in your work, please cite: | |
| ```bibtex | |
| @misc{negroni2025ljtts, | |
| title = {LJ-TTS: A Paired Real and Synthetic Speech Dataset for Single-Speaker TTS Analysis}, | |
| author = {Negroni, Viola and Salvi, Davide and Comanducci, Luca and Majid Wani, Taiba and Uecker, Madleen and Amerini, Irene and Tubaro, Stefano and Bestagini, Paolo}, | |
| year = {2025} | |
| } |