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5.1 Remote Broadcasting Remote broadcasting covers production in, or acquisition of program material from locations away from the studio center. News is an important part of radio and television broadcasting, and television, in particular, relies greatly on production that takes place outside the studio, for sports, music events, and drama production. Bringing outdoor events into…
A limited amount of bandwidth is allocated in wireless services. A wireless system is required to accommodate as many user as possible by effectively sharing the limited bandwidth. Therefore in the field of communications, multiple access could be defined as means of allowing multiple user. To share the finite bandwidth simultaneously.There are 4 basis schemes…
– WDM is analog multiplexing technique. – It’s working is same as FM. – In WDM different signals are from optical fibers. – Various light waves from different source combined to form a composite light signal that is transmitted across the channel to receive. – At the receive side the composite signal light signed is…
– It is an analog technique. – Signals of different frequencies are combined into a composite signal and is transmitted on the signal link. – Bandwidth of link should be greater than the combined bandwidth of various channels. – Each signals have different frequencies. – Channels are separated by strip of unused bandwidth called Guard…
– It is digital multiplexing technique. – Channel is not divided on the basis of frequency but on the basis of time. – Total time available in channel is divided between several users. – Each users is allocated to particular time interval called time slot. Types of TDM 1] Synchronous TDM 2] Asynchronous…
Multiplexing: Multiplexing is a method by which multiple analog signal or digital data streams are combined into one signal over a shared medium. The aim is to share expensive resource. For eg. in telecommunication, several telephone calls may be carried using one wire. A device that performs the multiplexing is called multiplexer (MUX) and the…
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Those physical quantities which have only magnitude but no direction are called scalars. For eg. Mass, Speed, Distance, Work, Energy, Charge, Current etc. Those physical quantities which have both magnitude and direction are called vectors. For eg. Displacement, Force, Velocity, Acceleration, Linear Momentum etc. Vectors are generally represented by a letter with arrow…
An atom or group of atoms which bears charge and behaves as single unit during chemical reaction is called radical. Eg. SO4—, Ca++ etc. Depending on charges present, radicals are classified as below:- Electropositive Radical (Basic Radical) (Cation):- These radicals possess positive charge and collect at cathode during electrolysis. Eg. NH4+, Ca++, Zn++ etc. Electronegative…
Valency: Valency is the combining capacity of an element with other elements. In electronic concept, valency is the number of electrons gained or lost or shared by an atom of an element during chemical reaction. Valency of an element depends on the number of valence electrons present in an element. Variable Valency: Some elements can…
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