RadarĪn acronym for “Radio Detection And Ranging” RADAR uses sounds of very high frequencies typically of the order of 1 to 3 MHz and is used in applications related to space, defense, engineering, metal studies etc. Medical uses of sound signals with a frequency of more than 20000Hz is done to determine the health and condition of internal organs or during a pregnancy to determine the growth of a foetus. Video on Communication System Applications of Signal Bandwidth Ultrasound So let us now study some applications of various signals in various bandwidths. Whereas Blue whales can produce infrasonic sounds. Sounds below 20Hz are known as Infrasonic and sounds above 20000Hz are known as ultrasonic. The audible bandwidth of human ear ranges from 20 Hz to 20,000Hz. Thus we see that bandwidths exist for all kinds of waves in both the visual and audio spectrums and well beyond them as well. Given above is a diagram representing various bandwidths of electromagnetic waves and it goes a long way in helping identify the type of wave on basis of its frequency and thus determining its applications. Neither do all the channel occupy all the frequencies nor is there no channel at every frequency, but every channel has its own unique frequency like an ID. As you tune, the radio you find various stations at various frequencies. The bandwidth of FM radio is 200 KHz from 88.1 MHz to 101.1 MHz for most places. Whenever you tune into a radio you find various stations at varying particular frequencies. Let’s understand this better with the help of an example. It is measured in terms of Hertz(Hz) i.e.
As seen from the above representation, Bandwidth (B) of the signal is equal to the difference between the higher or upper-frequency (fH) and the lower frequency (fL). The bandwidth of a signal is defined as the difference between the upper and lower frequencies of a signal generated. Basic Terminology Used in Communication Systems.So, what is Bandwidth of a signal? Browse more Topics Under Communication Systems This is where the concept of Bandwidth comes into the picture. This brings us to the methods employed in the process of identification of the signal. As we have come across in the discussions on the topics of Amplitude Modulation and Frequency Modulation, the original signal is superimposed on a carrier signal or changes its frequency to carry the information from the sender to the receiver where it is demodulated and converted back into the original signal.Įvery signal is composed of a large number of wavelengths of different frequencies and this signal is unique in terms of its composition. We all know that most signals are transmitted in terms of electromagnetic or radio waves.
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