MPEG-1 frames contain the most detail in mode, the highest allowable bit rate setting, with silence and simple tones still requiring . MPEG-2 frames can capture up to 12 kHz sound reproductions needed up to . MP3 files made with MPEG-2 do not have 20 kHz bandwidth because of the Nyquist–Shannon sampling theorem. Frequency reproduction is always strictly less than half of the sampling rate, and imperfect filters require a larger margin for error (noise level versus sharpness of filter), so an 8 kHz sampling rate limits the maximum frequency to 4 kHz, while a 48 kHz sampling rate limits an MP3 to a maximum 24 kHz sound reproduction. MPEG-2 uses half and MPEG-2.5 only a quarter of MPEG-1 sample rates.
MPEG-1 frames contain the most detail in mode, the highest allowable bit rate setting, with silence and simple tones still requiring . MPEG-2 frames can capture up to 12 kHz sound reproductions needed up to . MP3 files made with MPEG-2 do not have 20 kHz bandwidth because of the Nyquist–Shannon sampling theorem. Frequency reproduction is always strictly less than half of the sampling rate, and imperfect filters require a larger margin for error (noise level versus sharpness of filter), so an 8 kHz sampling rate limits the maximum frequency to 4 kHz, while a 48 kHz sampling rate limits an MP3 to a maximum 24 kHz sound reproduction. MPEG-2 uses half and MPEG-2.5 only a quarter of MPEG-1 sample rates.