| Category | Representative Systems | Limitations | |----------|------------------------|-------------| | | Unity Perception, NVIDIA Deep Learning Synthetic Data (DLSD) | Fixed pipelines, limited scene diversity | | Audio Synthesis | WaveGAN, DiffWave, Google’s AudioSet generators | Poor control over speaker identity, environmental acoustics | | Time‑Series Simulation | SimGAN‑TS, PyTSGen | Limited to a few stochastic processes, no domain‑specific extensions | | Unified Frameworks | SynthDet, SynapseML | Focused on single modality; lack of extensibility |