Question: In EVS (Enhanced Voice Services) codec, for bitrates below 32kbps, which encoding technology is primarily used for encoding inactive signals in IC (Inactive Compression) mode?
Option 1: GSC (Generic Sound Coding)
Option 2: AVQ (Advanced Vector Quantization)
Option 3: TC (Transform Coded Excitation)
Option 4: AC (Algebraic Code Excited Linear Prediction)
Explanation: According to the EVS codec's design for handling inactive signals (background noise), at bitrates below 32kbps, the GSC encoding technology is utilized in IC mode. This distinction in bitrate thresholds dictates the choice between GSC and AVQ for optimal performance in different scenarios, highlighting the importance of adaptive encoding strategies in voice services.