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The Class 12 Physics notes is a written explanation for every passage or concepts included in the chapter Communication Systems. These Communication Systems notes are available in the Portable Document Format. The PDF of the Class 12 Physics Notes can be easily downloaded without any difficulty. With the help of the downloaded revision notes ...
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Revision Notes. ass – 12 PhysicsChapter 15 - Commu. ication SystemIntroductionWe live in an information-rich world. It is necessary to convey information from one entity to another. Communication is the act of success. on, the term "successful" connotes a variety of things, includingThe sender and receive. have a common understanding on how ...
Jan 9, 2024 · Topic 1 Communication. 1. Communication Communication is the act of transmission and reception of information. 2. Communication System A system comprises of transmitter, communication channel and receiver. A block diagram of a generalised communication system is shown as below: 3. Transmitter It consists of transducer/signal generators ...
- 15.6.1 Ground wave
- 15.7 MODULATION AND ITS NECESSITY
- 15.7.2 Effective power radiated by an antenna
- 15.7.3 Mixing up of signals from different transmitters
- Facsimile (FAX)
- SUMMARY
- POINTS TO PONDER
To radiate signals with high efficiency, the antennas should have a size comparable to the wavelength λ of the signal (at least ~ λ/4). At longer wavelengths (i.e., at lower frequencies), the antennas have large physical size and they are located on or very near to the ground. In standard AM broadcast, ground based vertical towers are generally use...
As already mentioned, the purpose of a communication system is to transmit information or message signals. Message signals are also called baseband signals, which essentially designate the band of frequencies representing the original signal, as delivered by the source of information. No signal, in general, is a single frequency sinusoid, but it sp...
A theoretical study of radiation from a linear antenna (length l) shows that the power radiated is proportional to (l/λ)2 . This implies that for the same antenna length, the power radiated increases with decreasing λ, i.e., increasing frequency. Hence, the effective power radiated by a long wavelength baseband signal would be small. For a good tra...
Another important argument against transmitting baseband signals directly is more practical in nature. Suppose many people are talking at the same time or many transmitters are transmitting baseband information signals simultaneously. All these signals will get mixed up and there is no simple way to distinguish between them. This points out towards...
It scans the contents of a document (as an image, not text) to create electronic signals. These signals are then sent to the destination (another FAX machine) in an orderly manner using telephone lines. At the destination, the signals are reconverted into a replica of the original document. Note that FAX provides image of a static document unlike t...
Electronic communication refers to the faithful transfer of information or message (available in the form of electrical voltage and current) from one point to another point. Transmitter, transmission channel and receiver are three basic units of a communication system. Two important forms of communication system are: Analog and Digital. The informa...
In the process of transmission of message/ information signal, noise gets added to the signal anywhere between the information source and the receiving end. Can you think of some sources of noise? In the process of modulation, new frequencies called sidebands are generated on either side (higher and lower than the carrier frequency) of the carrier ...
Mar 15, 2021 · Summary. Communication is the act of transmission and reception of information. The transmitter, transmission channel, and receiver are three basic units of a communication system. Two important forms of the communication system are Analog and Digital. Two basic modes of communication are point-to-point and broadcast.
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The Communication Cycle. The communication cycle consists of five elements as shown in the following diagram: 1. Sender. The sender is the individual who wishes to communicate a message. To send effective messages, it is important to have: A knowledge of the audience for that particular message. Failure to understand the audience will result in ...
