I’m experiencing a persistent issue with the TTS (Text-to-Speech) functionality of the Gemini API. My TTS generation, which previously worked perfectly, now consistently produces a low-level hissing or static noise that is present in all generated audio.
This noise is particularly noticeable when the voice is speaking and is almost completely absent during silent pauses. This suggests the issue is an artifact of the voice generation itself, rather than simple background noise.
I’ve been working with this API for a while, and the problem appeared suddenly around September 12-13, 2025.