Frequency Spectrum
Audio Frequency Spectrum
The range of frequencies present in an audio signal, typically from 20 Hz (bass) to 20 kHz (treble) for human hearing.
Détail technique
According to the Nyquist-Shannon theorem, a frequency spectrum must be at least twice the highest frequency to be captured. CD audio uses 44,100 Hz (capturing up to 22,050 Hz, beyond most human hearing at ~20,000 Hz). Professional audio uses 48,000 Hz (video standard), 96,000 Hz, or 192,000 Hz for headroom during processing. Higher sample rates are valuable for time-stretching and pitch-shifting algorithms but provide no audible benefit during playback for most listeners.
Exemple
``` Sample rate standards: 8,000 Hz — Telephone (max 4 kHz audio) 22,050 Hz — AM radio quality 44,100 Hz — CD audio (captures up to 22 kHz) 48,000 Hz — Video/broadcast standard 96,000 Hz — High-res audio production Nyquist: sample_rate ÷ 2 = max capturable frequency 44,100 Hz ÷ 2 = 22,050 Hz (above human hearing ~20 kHz) ```
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