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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.
What else can I help you with?
Application of multiplexing in data communication?
application of multiplexing in data communication
What is amplitude shift keying modulation?
micxingthe between the phasr and frepaancy shift keying
What is the difference between multiplexer and demultiplexer?
A multiplexor is a device that takes two or more signals and encodes them on fewer (often, on one) wire. A demultiplexor is a device that reverse that process.
Why is Angle Modulation called nonlinear modulation?
angle modulation is called non linear modulation because the information is stored in phase of the carrier signal
What does FM stand for in radio frequency?
FM means Frequency Modulated.FM stands for modulation on frequency or frequency modulation.
What is the relationship between frequency modulation and the frequency carrier to the modulation index in the AM modulation?
fc>2fm
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.
Orthogonal Frequency Division Multiplexing is a multi-carrier modulation scheme The data is?
Split up among several closely spaced subcarriers.
What is the difference between frequency modulation and phase modulation?
The difference between frequency modulation and phase modulation is that with frequency modulation the angular frequency of the signal is modified while with the phase modulation, the phase angle of the signal is modified.
Which happen first the modulation or the multiplexing?
A terminal may transmit several application, at a time. All such data of that terminal is multiplexed, and this multiplexed signal is modulated onto a carrier.
What is the difference between pulse code modulation and delta modulation?
The difference between pulse code modulation and delta modulation is that pulse code modulation is a method of encoding audio information digitally while delta modulation is a method that converts analog to digital signal.
What is the difference between space vector modulation and pulse width modulation?
There is no difference.
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.
Difference between switching and multiplexing?
Multiplexing-Combining all the inputs into one output. Switching-Taking one input to the output, at a time/frequency
Which of the three multiplexing techniques arre used to combine digital signals?
Frequency-division multiplexing, wavelength-division multiplexing, and time-division multiplexing.
