Which codec provides the highest voice quality?

Which codec provides the highest voice quality?

• A. G.711
• B. G.729
• C. iLBC
• D. G.722

Answer: (D)

Voice quality depends on how much of the audible spectrum a codec can reproduce. Wideband codecs capture a broader range than narrowband ones, producing clearer and more natural dialogue. G.722 is a wideband codec, commonly delivering audio from about 50 Hz up to 7 kHz while using around 64 kbps, which lets it reproduce more of the human voice spectrum than the standard G.711’s narrowband speech (which covers a smaller range). G.729 and iLBC compress more aggressively for lower bandwidth, so their fidelity is lower than wideband codecs. Because of its wider frequency range and clear reproduction, G.722 offers the highest voice quality among these options.

Voice quality depends on how much of the audible spectrum a codec can reproduce. Wideband codecs capture a broader range than narrowband ones, producing clearer and more natural dialogue. G.722 is a wideband codec, commonly delivering audio from about 50 Hz up to 7 kHz while using around 64 kbps, which lets it reproduce more of the human voice spectrum than the standard G.711’s narrowband speech (which covers a smaller range). G.729 and iLBC compress more aggressively for lower bandwidth, so their fidelity is lower than wideband codecs. Because of its wider frequency range and clear reproduction, G.722 offers the highest voice quality among these options.