Question: Under what condition is the speech/music classification result overridden for noisy speech signals before deciding on the Adaptive Code (AC) mode in EVS codec?
Option 1: When the background noise level is lower than 6dB
Option 2: When the raw coding mode indicates a voiced signal
Option 3: When the bitrate is below a certain threshold for GSC technology
Option 4: When the level of the background noise is higher than 12dB
Explanation: Overriding speech/music classification results for noisy speech signals at high background noise levels (>12dB) protects against mis-classifying active noisy speech signals, ensuring more accurate mode selection (e.g., AC mode) in the EVS codec, which is crucial for maintaining voice quality in noisy environments.