What is the idiom of frequency band?

The idioms in the frequency band are: frequent telephone calls, frequent floods and droughts, and frequent good news.

The idiom in the frequency band is: frequent conflicts, contempt for people and surprise. 2. The structure is, frequency (left and right structure) section (left and right structure). 3. The phonetic notation is ㄣㄉㄨㄢ _. 4: Pinyin is, pínduàn n.

What is the specific explanation of frequency band? We will introduce you through the following aspects:

I. Text Description Click here to view the details of the plan.

Divide radio waves into segments according to different frequencies, such as low frequency _ intermediate frequency _ high frequency _ ultra-high frequency.

Second, the citation interpretation

1. Divide radio waves into segments according to different frequencies, such as low frequency, intermediate frequency, high frequency and ultra-high frequency.

Third, the network interpretation

Frequency band is a term related to communication and acoustics. In the field of vocal music, frequency band refers to the frequency of sound. The range of human ear's perception of sound frequency is from the lowest 20Hz to the highest 20KHz, while the range of human voice frequency is from 80 Hz to 12 kHz. Different frequency bands have different feelings for people. In the field of communication, frequency band refers to the frequency range of electromagnetic waves in Hz, which can be divided into very low frequency (VLF)3kHz~30kHz, and the corresponding electromagnetic wave wavelength is very long wave 100km~ 10km. The low frequency (LF) is 30 kHz ~ 300 kHz, and the corresponding electromagnetic wave wavelength is 10km~ 1km. The intermediate frequency (MF) is 300 kHz ~ 3000 kHz, and the corresponding electromagnetic wave wavelength is medium wave1000 m ~100 m. High frequency (HF) is 3 MHz ~ 30 MHz, and the corresponding electromagnetic wave wavelength is100 m ~10 m. Very high frequency (VHF) is 30 MHz ~ 300 MHz, and the corresponding electromagnetic wave wavelength is10 m. Ultra high frequency (UHF) is 300 MHz ~ 3000 MHz, and the corresponding electromagnetic wave wavelength is decimeter wave 100cm~ 10cm. Ultra-high frequency (SHF) ranges from 3 GHz to 30 GHz, and the corresponding electromagnetic wave wavelength is centimeter wave 10cm~ 1cm. Extremely high frequency (EHF) is 30 GHz ~ 300 GHz, and the corresponding electromagnetic wave wavelength is 10 mm ~ 1 mm .. to 300 GHz ~ 3000 GHz, and the corresponding electromagnetic wave wavelength is Simi wave1mm ~ 0.1mm.

Words about frequency bands

Frequent floods and droughts, frequent conflicts, not too bad, unpredictable roads, just win good news by hook or by crook.

Sentence-making about frequency bands

1. Recently, two audio clips of making a fire alarm call were circulated on the Internet. It was a storm in the city, and "Lei" fell many netizens.

Classical FM radio is my favorite. Please tune to that frequency band.

3. Introduce a power control scheme for RF reader-writer in UHF and above frequency bands.

4. The results show that the space charge reduction factor of the spiral conductive surface model has little change in the higher frequency band compared with the ideal conductive cylinder.

5. Then, the realization of diagonal advantage of Nei Lu rod in a certain frequency band is studied.

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