Jinghao hearing aids Science Popularization: what is Hertz?

Jinghao hearing aid experts say people who come into contact with hearing aids often hear a unit called hertz. What is Hertz?

The number of times the vibration is completed in unit time is called frequency. The unit of frequency is hertz. One second of vibration is called 1 Hertz (Hz).

Sound can be quantified in terms of time and space. Quantitative in terms of time, it refers to cycle and frequency. Quantitative in space, mainly referring to amplitude and wavelength.

The time required for a periodic vibration is the reciprocal of the frequency, usually in milliseconds (MS). For example, a pure tone with a frequency of 1000 Hz has a period of 1 millisecond.

Jinghao hearing aid experts say that people’s ears can hear sound in the range of 20 Hz to 20000 Hz. There are also vibrations and waves below 20 Hz and above 20000 Hz in nature, but they cannot cause our hearing. The ultrasonic wave is higher than 20000 Hz, and the infrasound is lower than 20 Hz.

The range of the human ear can be 10 octaves higher, and the sound from C1 to C5 (from 32 to 4096 Hz) belongs to the musical range. The voice up to C2 (512 Hz) is listed as the low range, and the voice from C3 to C5 (512-4096 Hz) is listed as the high range.

Jinghao hearing aid experts say that the frequency range of human conversation is usually 500-3000 Hz. The difference between pure tone, compound tone and voice also lies in the difference of frequency. Pure tone refers to a single frequency sound, commonly used in listening tests. Voice is people’s daily conversation. Composite music and noise are both, they all contain a variety of frequency components.