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Filtering White Noise:
White noise is a special signal that contains equal-amplitude components
at all frequencies, not just at integer multiples of a fundamental frequency.
(Because frequency components above 20,000 Hz cannot be heard by humans,
we do not include them in the sounds below.)
Listen to white noise, low-pass filtered white noise
(frequencies above 2000 Hz removed), high-pass filtered white noise
(frequencies below 4000 Hz removed), and band-pass filtered white noise
(frequencies below 3000 Hz and above 5000 Hz removed).
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