Question: In the EVS (Enhanced Voice Services) codec, how are peak positions decoded in the HVQ (Hierarchical Vector Quantization) decoder, based on the received mode decision?
Option 1: Exclusively with Huffman decode for all modes.
Option 2: Either with Huffman decode or space coding decoder, depending on the received mode decision.
Option 3: Solely with space coding decoder, irrespective of the mode.
Option 4: Through a combination of PVQ (Perceptual Vector Quantization) and noise filling techniques.
Explanation: The correct answer is Option 2 because, according to the HVQ decoding process in the EVS codec, peak positions are indeed decoded using either Huffman decode or space coding decoder, with the choice between these two methods being determined by the received mode decision. This approach allows for flexibility and optimization based on the specific requirements of the transmission.