Audible frequency

• Audible frequency is characterized as a periodic vibration whose frequency is audible to the average human.
• The generally accepted standard range of audible frequencies is 20 to 20,000 Hz for humans.
• All telephone circuits operate with AF signals in a restricted range of approximately 200 Hz to 3000 Hz.

• Some of the common audible frequencies of animals.

• The below table shows the different sounds.

Frequencies (Hz)	Also known as	Remarks
1-20	Infrasound	Not heard by human ears but can be felt as vibrations.
20-20000	Audible frequencies	The range of frequencies is also known as range of audibility.
20000 & above	Ultrasound	Mainly used in medical diagnosis.