Question: What are the possible input sampling rates for an Enhanced Voice Services (EVS) encoder, as specified in telecom standards for voice codecs?
Option 1: 12 kHz, 24 kHz, 48 kHz
Option 2: 8 kHz, 16 kHz, 32 kHz, 48 kHz
Option 3: 4 kHz, 8 kHz, 16 kHz
Option 4: 8 kHz, 16 kHz, 32 kHz, 48 kHz (corresponding to narrow-band, wideband, superwideband, and fullband signals respectively)
Explanation: In telecom, particularly for voice codecs like EVS, the input sampling rate flexibility is crucial for accommodating different bandwidth signals. Option 4 correctly lists all possible input sampling rates (8 kHz, 16 kHz, 32 kHz, 48 kHz) that correspond to narrow-band, wideband, superwideband, and fullband signals, respectively, ensuring compatibility with various voice service qualities.