Question: In EVS Channel-Aware Mode for VoIP systems, what is the primary purpose of combining a de-jitter buffer with partial redundancy coding?
Option 1: To reduce the overall bitrate to 13.2 kbps for super-wideband audio.
Option 2: To enhance speech quality by synthesizing lost frames under low to high Frame Error Rate (FER) conditions.
Option 3: To eliminate the need for source control in determining frame coding rates.
Option 4: To ensure packets are always delivered in sequence, regardless of network jitter.
Explanation: The combination of a de-jitter buffer with partial redundancy coding in EVS Channel-Aware Mode mitigates packet loss and jitter effects in VoIP systems. By checking the de-jitter buffer for partial redundant copies of lost frames within future frames, the receiver can synthesize the lost frame, improving speech quality under various Frame Error Rate (FER) conditions, addressing random jitters and out-of-order packet arrivals in VoIP environments.