äänikynnyksen

Äänikynnys refers to the threshold of hearing, the minimum sound pressure level a person can detect under specific conditions. It is typically measured in decibels (dB) and is frequency-dependent, meaning the ear is more sensitive to certain frequencies than others. For a young, healthy human ear, the absolute threshold of hearing is generally considered to be around 0 dB SPL at a frequency of 1 kilohertz. However, this value can vary significantly between individuals and with age.

The concept of äänikynnys is crucial in audiology and acoustics. Audiometers used in hearing tests measure an individual's hearing thresholds across various frequencies to identify potential hearing loss. In acoustics, äänikynnys helps define the lower limit of audible sound, distinguishing it from inaudible vibrations. Environmental noise regulations also often refer to äänikynnys to set limits on acceptable sound levels in different settings.

Factors influencing äänikynnys include age, exposure to loud noise, certain medical conditions, and even psychological factors. As people age, their äänikynnys often increases, particularly at higher frequencies, a phenomenon known as presbycusis. Prolonged exposure to noise above certain levels can cause temporary or permanent shifts in the äänikynnys, leading to noise-induced hearing loss. Understanding äänikynnys is fundamental to comprehending human hearing capabilities and the impact of sound on our environment.