Question: In the Enhanced Voice Services (EVS) codec, what is the primary purpose of the two-stage speech/music classification process?
Option 1: To optimize speech coding for background noise reduction
Option 2: To select between different Linear Prediction (LP) models for speech encoding
Option 3: To distinguish music signals from speech, enabling the use of a different coding approach, known as Generic audio Signal Coding (GSC) or Audio Coding (AC) mode
Option 4: To determine the optimal bit rate for audio transmission based on signal type
Explanation: The primary purpose of the speech/music classification in the EVS codec is to differentiate between music (generic audio) and speech, allowing for a distinct coding strategy, specifically designed for generic audio signals, known as Generic audio Signal Coding (GSC) or Audio Coding (AC) mode, for efficient compression and quality preservation.