Audio frequency range, audible frequency

What is the audio frequency range?

Audio frequency or audible frequency is a periodic vibration with a frequency falling within the band audible to the average human, which is the range of human hearing. The unit of frequency in the SI system is the hertz (Hz). The property of sound that is most determined by frequency is pitch.

The generally accepted standard hearing range for humans is 20 to 20,000 Hz. In air at atmospheric pressure, these waves represent sound waves with wavelengths ranging from 17 meters (56 ft) to 1.7 cm (0.67 in). Frequencies below 20 Hz are often felt rather than heard. High frequencies are the first to be affected by hearing loss due to aging or long-term exposure to very loud noise.

The audio frequency range is generally established as 20 Hz to 20,000 Hz, although most people can hear less than this full range, and as they age, this range tends to narrow at both ends. The relationship between music and audio frequencies is that every time you go up an octave, you double the frequency. With a piano, the lowest note, A, is approximately 27 Hz while the highest note, C, is about 4186 Hz, but at lower amplitudes. For example, the 27 Hz "A" on a piano also produces a much quieter 54 Hz harmonic, as well as an even quieter 81 Hz, and so on. These harmonics are very important for high-fidelity speaker systems that want to accurately reproduce the source.

What are the small subranges of the audible frequency range?

Within the 20 Hz to 20 kHz audio frequency range, there are seven frequency subsets used to help define bands that can be targeted in the design of recording or playback systems.

Sound in certain frequency bands

Some musical notes will have a frequency level from 262 to 494 Hz.

Method for calculating the frequency of musical notes.