Question: In a Telecommunication Network supporting variable-size packet transmission (e.g., LTE, UMTS), what is the primary advantage of using Variable Bit Rate (VBR) coding over Fixed Rate (FR) coding for speech signals?
Option 1: Reduced average active bit rate for all types of audio signals, including music.
Option 2: Simplified implementation at the receiver end due to consistent packet sizes.
Option 3: Enhanced security through dynamic bit allocation.
Option 4: Better speech quality at the same average active bit rate due to finer bit allocation.
Explanation: VBR coding allocates bits based on the characteristics of the input speech signal (e.g., voiced, unvoiced, transient), which leads to more efficient use of bandwidth. This dynamic allocation allows for better preservation of speech quality when compared to Fixed Rate coding, especially in networks that can handle variable-size packets. The correct answer highlights the key benefit of VBR in telecom networks capable of supporting such transmissions.