Question: In EVS (Enhanced Voice Services) codec, according to 3GPP standards, at what bitrate threshold does the internal decoder partially recompute the optimum global gain after applying noise filling and formant enhancement?
Option 1: Less than 6.6 kbps
Option 2: Equal to or above 16 kbps
Option 3: Less than 13.2 kbps
Option 4: Exactly at 9.6 kbps
Explanation: This question assesses understanding of bitrate-dependent operations within the EVS codec, specifically how global gain adjustment is handled in response to varying bitrates. The correct answer, 'Less than 13.2 kbps', reflects a nuanced understanding of when the internal decoder initiates partial recomputation of the optimum global gain following specific audio enhancements, highlighting the codec's adaptive nature in balancing quality and bitrate efficiency.