The dynamic range of human hearing is roughly 140 dB, varying with frequency, from the threshold of hearing (around −9 dB SPL at 3 kHz) to the threshold of pain (from 120–140 dB SPL ). Such a difference can exceed 100 dB which represents a factor of 100,000 in amplitude and a factor 10,000,000,000 in power. The instantaneous dynamic range of human audio perception is similarly subject to masking so that, for example, a whisper cannot be heard in loud surroundings.Ī human is capable of hearing (and usefully discerning) anything from a quiet murmur in a soundproofed room to the loudest heavy metal concert. The human eye takes time to adjust to different light levels, and its dynamic range in a given scene is actually quite limited due to optical glare. However, a human cannot perform these feats of perception at both extremes of the scale at the same time. The human senses of sight and hearing have a relatively high dynamic range. Human perception Power ratios and their equivalent decibels and stops (integer values in bold)
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