Question: In EVS (Enhanced Voice Services) codec, what triggers the increment of the counter used for determining the LP-CNG Hangover analysis period during DTX operation?
Option 1: Primary SAD active decisions with DTX SAD flag set to 1
Option 2: Actively encoded speech segments with primary SAD flag set to 0 and DTX SAD flag set to 1
Option 3: Receipt of three-bit counter value from the decoder
Option 4: Transition from active speech to comfort noise generation
Explanation: The correct answer is Option 2 because, according to the EVS codec specifications for DTX operation, the counter for determining the LP-CNG Hangover analysis period is incremented in actively encoded speech segments under specific conditions: when the primary SAD flag is set to 0 and the DTX SAD flag is set to 1, signifying a relevant condition for comfort noise analysis without primary speech being active.