Turning a continuous sound wave into a digital file means “photographing” the waveform many times per second — that count is the sample rate. How fast is fast enough? Claude Shannon, the father of information theory, proved it rigorously in his classic 1949 paper “Communication in the Presence of Noise”: as long as the sample rate is at least twice the signal’s highest frequency component, the original continuous signal can be perfectly reconstructed. This is the celebrated Nyquist–Shannon sampling theorem.
Sample below 2× and you get aliasing: high-frequency content masquerades as phantom low-frequency noise — and it cannot be removed afterwards.
Human hearing extends to roughly 20 kHz (declining with age), so the theorem demands at least 40 kHz. The CD settled on 44.1 kHz: the extra margin accommodates the analog filter’s transition band, and the odd-looking number traces back to early digital audio being stored on video tape machines — 44.1 kHz divides evenly into the TV scan-line formats of the day.
The MP3 standard, ISO/IEC 11172-3, supports three sample rates — 32, 44.1, and 48 kHz — and 44.1 kHz remains the mainstream for music distribution.
The MP3 Cutter preserves source quality on export, so no extra configuration is needed.
Try the MP3 Cutter Now