Question: What is the resolution of speech samples fed into the Adaptive Multi-Rate (AMR) speech codec encoder, and how are they formatted within a 16-bit word?
Option 1: 14 bits right-justified with the two most significant bits set to '0'
Option 2: 13 bits left-justified with the three least significant bits set to '0'
Option 3: 15 bits left-justified with the one least significant bit set to '0'
Option 4: 12 bits right-justified with the four most significant bits set to '0'
Explanation: The correct answer is Option 2 because, according to the specified formatting for the AMR speech codec, the encoder expects input samples that are 13 bits in resolution, positioned in the most significant bits of a 16-bit word (left-justified), with the remaining three least significant bits of the word set to '0'. This precise formatting is crucial for proper encoding and subsequent decoding processes within telecom networks, ensuring compatibility and effective speech transmission.