Analog transmission

Source: Wikipedia, the free encyclopedia.

Analog transmission is a

signal, using an analog modulation method such as frequency modulation (FM) or amplitude modulation
(AM), or no modulation at all.

Some textbooks also consider

digital transmission
, although the source signal may be a digitized analog signal.

Methods

Analog transmission can be conveyed in many different fashions:

There are two basic kinds of analog transmission, both based on how they modulate data to combine an input signal with a carrier signal. Usually, this carrier signal is of a specific frequency, and data is transmitted through its variations. The two techniques are amplitude modulation (AM), which varies the amplitude of the carrier signal, and frequency modulation (FM), which modulates the frequency of the carrier.[1]

Types

Most analog transmissions fall into one of several categories.

modems, to convert analog signals to digital signals
and back.

Benefits and drawbacks

The analog transmission method is still very popular, in particular for shorter distances, due to significantly lower costs with complex multiplexing and timing equipment that are unnecessary, and in small "short-haul" systems that simply do not need multiplexed digital transmission.[2]

However, in situations where a signal often has high

long distance, high output systems, analog is unattractive due to attenuation problems. Furthermore, as digital techniques continue to be refined, analog systems are increasingly becoming legacy equipment.[2]

Recently, some nations, such as the Netherlands, have completely ceased analog transmissions (

analog switch-off) on certain media, such as television,[3] for the purposes of the government saving money.[4]

See also

References

  1. ISBN 0-8247-2900-5
  2. ^
    ISBN 0-471-45133-9
  3. ^ Bode, Karl. "Netherlands Ends Analog Transmission - Goodbye antenna, hello digital... | DSLReports, ISP Information". DSL Reports.
  4. ^ https://www.nytimes.com/aponline/technology/AP-Netherlands-TV.html?_r=2&oref=slogin&oref=slogin [permanent dead link]
Retrieved from "https://en.wikipedia.org/w/index.php?title=Analog_transmission&oldid=1176428234"