1.Definition
1.1 frequency band
Frequency band refers to the frequency width occupied by the signal , the unit is Hz
1.2. Frequency band
In the field of communications, frequency band refers to the frequency range of electromagnetic waves , and the unit is also Hz.
2.Explain with examples
The figure below shows the frequency band and frequency range of the analog telephone signal . The
upper part of the figure indicates: the frequency band of the analog telephone signal is 3400 - 300 = 3100Hz (frequency width).
The lower part indicates: the frequency band of the analog telephone signal is 300~3400Hz (frequency range).
3. Postscript
Baidu Encyclopedia's definition of frequency band is: bandwidth, which refers to the width of the frequency band occupied by the signal , in Hz. The original poster feels that it is a little inappropriate to use " frequency band " to describe the frequency band. Therefore, it is replaced by the " frequency " width of the signal according to the original poster's own understanding . It’s just my personal understanding. If any master thinks it’s inappropriate, please give me some guidance!
Reference article:
https://baike.baidu.com/item/%E9%A2%91%E5%B8%A6/8872886?fr=aladdin
https://baike.baidu.com/item/%E9%A2% 91%E6%AE%B5/10828844?fr=aladdin#1_1
[Computer Network Seventh Edition] by Xie Xiren