1, low frequency range: 30- 150 Hz is the low frequency band.
2. Intermediate frequency range: 150-500-5KHz is the medium and low frequency band, and 500-5KHz is the medium and high frequency band.
3. High frequency range: 5K- 16KHz high frequency band.
This is the frequency band range divided according to IEC58 1 standard of International Electrotechnical Association and Chinese national standard GB/T 14277-93.
Neither of the above two electroacoustic technical standards lists the frequency band above 16KHz. In non-standard technical standards, some people call this section UHF band.
Extended data:
The number of times a substance completes a periodic change in 1s is called frequency, which is often expressed by F. ..
In order to commemorate the contribution of German physicist Hertz, people named the unit of frequency Hertz, abbreviated as "Hertz", and the symbol was Hertz.
Frequency, that is, the number of times to complete periodic changes in time, is a quantity that describes the frequency of periodic motion. It is usually represented by the symbol F or V, with the unit of one second and the symbol s- 1.
The frequency of alternating current refers to the number of times it changes periodically in unit time. The unit is hertz (Hz), which is the reciprocal of the period. The frequency of alternating current in daily life is generally 50Hz or 60Hz, while the frequency of alternating current involved in radio technology is generally large, reaching the measurement of kilohertz (KHz) or even megahertz (MHz).
The basic unit of frequency in physics is hertz (Hz), and it is also commonly used in kilohertz (kHz) or megahertz (MHz) or gigahertz (GHz). 1kHz= 1000Hz， 1 MHz = 100000hz， 1GHz= 1000MHz。
References:
Frequency-Baidu Encyclopedia