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Whatis the function of modem?
MOdulate/DEModulate. It converts digital computer signals into analog ones for transmission over analog telephone lines, and then converts the signal back into digital on the other end.
What is the main advantage of digital transmission over analog transmission?
digital signal is less susceptible to signal degradation due to the nature of it's transmission signal which is either on or off and therefore less errors occur as analog is prone to signal degradation and loss that is why digital tv is crisp and clear and analog is somewhat blurry in comparison, also with higher bandwidth achievable by digital transmission more data is able to be transmitted.
What does digital cable mean?
Digital signals permit greater transmission of data over analog signals. The URL http://telecom.hellodirect.com/docs/Tutorials/AnalogVsDigital.1.051501.asp has quite a bit of useful information on the differences between analog and digital broadcasting
What are the advantages of a digital radio over an analog radio?
The advantages of digital radio over analog radio are digital radios get more channels than analog, they are clearer in sound and signal and have more additional features.
Why digital is cheaer than analog?
Digital is cheaper for two possible reasons. The answer will be determined by your question of type of digital as in physical components or radio based transmissions. Number one: Digital devices can be made smaller with less components than analog. Number two: More information can be transmitted over the same available transmission space using digital than can be with analog.
What is the difference between analog and digital data transmission?
This is essentially the same question as the difference between analog and digital. With analog electronics a voltage is used to represent (or to be an analogy for) some physical attribute in the real world. So for an analog transmission, at its simplest, a sound signal (say) is converted to a voltage, the voltage sent down a cable, then at the other end the voltage converted back into sound with a loudspeaker. With a digital system, the physicial attribute is measured and sent as a series of numbers, the numbers being converted to binary. For a digital transmission, the sound signal is converted to a series of numbers, sent as binary, and converted back to a sound signal at the other end. The advantages of digital is that it makes multiplexing much easier - making it easier to put many signals down the same physical cable. It also makes compressing the signal much easier - this is particularly effective for digital television transmission; 30-40 digital channels can be sent over the same bandwidth as 4 or 5 uncompressed analog channels. Also, digital is much more resiliant against noise - the digital receiver has to make a decision about each bit - is it there or not; noise can be pretty extreme before this becomes impossible, with analog, once noise is added its very difficult to remove it. The historical disadvantage of digital is that digital encoding and decoding equipment was expensive compared with the analog. Over the last 10 years or so, digital electronics has become much cheaper and more powerful.
What Is a Computer modem made of?
A computer modem is made up of various components including a modulator, demodulator, analog-to-digital converter, digital-to-analog converter, signal processor, and a connection interface such as Ethernet or phone line. These components work together to modulate digital data from the computer into analog signals for transmission over a communication medium and then demodulate received analog signals back into digital data for interpretation by the computer.
Why is it necessary to digitize voice signals?
To minimize the distortion of analog signals during transmission Because digital lines transmit signals more efficiently across distances than analog lines Because many telephone networks are moving over to digital interfaces
How are digital aerials different from analog ones?
Digital aerials get a better quality of picture than do analog aerials. in addition, digital aerials can get high definition signals over the air,where analog aerials cannot.
What are the advantages of digital stereo plotter over the analog type?
Digital stereo plotter is more accurate than the analog one in producing maps.
Advantages of hybrid modulation over digital modulation?
presentation of analog digital hybrid modulation
You h ave radio which receives television channels and therefore listen to some television programs over the radio will you still be able to receive television through your old radio after the digital?
No I am afraid not. The radio you have was built for reception of analog television audio. Once all the broadcasters switch their mode of transmission from analog to digital, all their signals going out over the air will be in a digital format.
