Question: What is the primary coding technique employed by the EVS (Enhanced Voice Services) codec for speech signals, and what additional method is used for generic content?
Option 1: CELP (Code Excited Linear Prediction) for speech; MDCT (Modified Discrete Cosine Transform) for generic content
Option 2: ACELP (Algebraic Code Excited Linear Prediction) for speech; Transform coding for generic content
Option 3: LPC (Linear Predictive Coding) for speech; PCM (Pulse Code Modulation) for generic content
Option 4: DPCM (Differential Pulse Code Modulation) for speech; Sub-Band Coding for generic content
Explanation: The EVS codec utilizes a hybrid approach, combining ACELP (a type of CELP) for efficiently coding speech signals due to its ability to model the human vocal tract accurately, with transform coding for handling generic (non-speech) content. This dual approach allows for optimal compression across various types of input.