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Why is modulation necessary before multiplexing?
modulation means transmitting the signal which is to be transmitted along with the carrier wave, then at the receiver it is separated from the carrier and demodulated. So modulation is needed so as to transmit the signal over long distances with higher accuracy. Hence it is required before multiplexing.
What has the author Gordon Drury written?
Gordon Drury has written: 'Coding and modulation for digital television' -- subject(s): Digital modulation, Multiplexing, Digital television, Coding theory
What type of modulation used in TV?
In cable TV, we use frequency multiplexing but in DTH, we use PCM along with quantization.
What is the relationship between multiplexing and modulation?
Modulation is the way a source of information transmits that information through a carrier. For example, look at human speech. A person, the source of information, transmits data by modulating the air with sound waves in a way that is understandable to other humans. In this case the air is the carrier. Multiplexing is when many slower data lines (CAT5, POTS, etc.) are combined into a single faster data line (T1, Optical Fiber). An example is the communications backbone between two cities. A fast, high bandwidth optical line joins the cities together, but when it reaches either city's limits, it is split up into many individual phone or data circuits. The bottom line is that modulation is how a source manipulates the carrier where as multiplexing is combining multiple circuits into a single, faster line and then separating them again.
Orthogonal Frequency Division Multiplexing is a multi-carrier modulation scheme The data is?
Split up among several closely spaced subcarriers.
What modulation technique used in mobile phones?
Currently the mobiles use GSM(Geo Synchronous Mobiles ) and CDMA(Code Division Multiple Accesss) techniques. GSM inturn uses TDMA(Time Division Multiplexing) or FDMA(Frequency Division Multiplexing) or sometimes both to fit in the required criteria.
What is lowlevel amplitude modulation and highlevel amplitude modulation?
low level amplitude modulation occurs when the carrier signal is first modulated and then amplified,whereas in high level modulation,the carrier signal is first amplified and then is modulated.
Which of the three multiplexing techniques arre used to combine digital signals?
Frequency-division multiplexing, wavelength-division multiplexing, and time-division multiplexing.
Which of the three multiplexing techniques are used to combine analog signals?
Frequency-division multiplexing and wavelength-division multiplexing
What is the Block diagram for time division multiplexing?
What is multiplexing and its diagram
Application of multiplexing in data communication?
application of multiplexing in data communication
Why amplitude division multiplexing is not used?
what is function of amplitude division multiplexing
