It is used to calculate sound intensity and other physical quantities. The unit of intensity of sound is decibel (dB). At 1000 Hz sine, one sone corresponds to 40 phons or 40 decibels. The psychoacoustic unit of measurement for the subjective loudness N of a sound event is the sone. This corresponds to a sound pressure level of 2 x 10 -10 bar. This unit of measurement refers to the sound intensity of 10 -16 W/c 2 at a frequency of 1,000 hertz. The unit of measurement for this is the phon (or fon). ![]() Therefore, in addition to sound pressure and sound pressure level, sound intensity must also be measurable as a purely subjective quantity. In such cases, these tones are also perceived as being of different volumes. Sounds can have the same sound level but a different frequency. P 0: Reference sound pressure (p 0 = 0.00002 Pa) The following formula can be used to calculate the sound pressure: The smallest just audible sound pressure is a tone with a volume of 1 kHz. The latter is already the upper hearing limit, also called the "pain limit" due to the high sound pressure. The human ear can perceive a sound pressure range from 0.00002 Pascal (Pa) to about 20 Pa. The sound pressure level is the measure of loudness. Frequencies below 20 Hz are usually not really heard but rather felt. Humans can hear sounds in a frequency range of 16 to 20,000 Hz. They propagate from their sound source (e.g., in the form of pressure waves). The intensitiy of a sound wave is a longitudinal wave that cause us to hear sounds. Based on the generated sound pressure, the unit decibel can be derived. However, the pressure fluctuations generated due to sound waves can be measured physically. How loud a person perceives the emitted sound waves is individual and thus not objectively measurable. These air pressure fluctuations cause the human eardrum to vibrate, which causes the sound to be heard by the person. Higher tone frequencies, unlike lower tones, have higher hertz numbers.Įvery sound source emits sound waves, which create waves of high and low pressure in the air. Hertz (Hz) is used as the SI unit of frequency. The vibrations of a sound wave per second are called "sound frequency".
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