A tide-mill kiosk keeps Riva ASR and TTS frozen and tries two different pretrained language heads on the same recognized lines. Why is that the right control?
Select an answer to reveal the explanation.
Short Explanation
If the question is “did understanding get better,” lock the ear and the mouth and only swap the brain. Same recognized lines, same voice—then the language head is what you are testing.
Full Explanation
Single-factor control in a Riva pipeline means varying only the NLP/language stage while ASR input and TTS output stay constant. That design answers whether understanding improved without confounding speech recognition or synthesis changes. Scale knobs and multi-stage thrashing break that isolation.