Glossary
SNR (signal-to-noise ratio)
The ratio of desired signal power to background noise power, expressed in decibels. Higher SNR means cleaner audio.
Quiet studio recordings commonly sit well above 30 dB SNR, while busy streets and vehicles can push speech toward 0 dB, where voice and noise are equally loud. TTS training wants high SNR; robustness training deliberately includes low-SNR material, often made by mixing noise into clean speech at controlled levels. Dataset specs quote SNR ranges per recording condition.
Why it matters
SNR is the single number that most quickly describes how clean an audio archive is.