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analog signal
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Analog multiplexing, as employed in the North American telephone systemIn frequency-division multiplexing (FDM), 12 separate voice signals, each of 4-kilohertz bandwidth, are modulated onto carrier waves in the 60–108-kilohertz range. These modulated signals are combined to form a single complex group signal. Groups are further combined to form a hierarchy of increasing bandwidth and voice-carrying capacity.
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Analog multiplexing, as employed in the North American telephone systemIn frequency-division multiplexing (FDM), 12 separate voice signals, each of 4-kilohertz bandwidth, are modulated onto carrier waves in the 60–108-kilohertz range. These modulated signals are combined to form a single complex group signal. Groups are further combined to form a hierarchy of increasing bandwidth and voice-carrying capacity.
Analog multiplexing, as employed in the North American telephone system

In frequency-division multiplexing (FDM), 12 separate voice signals, each of 4-kilohertz bandwidth, are modulated onto carrier waves in the 60–108-kilohertz range. These modulated signals are combined to form a single complex group signal. Groups are further combined to form a hierarchy of increasing bandwidth and voice-carrying capacity.

An analog signal represents information using continuously variable physical quantities, such as electrical potential or voltage. This is in contrast to digital signals, which use discrete values (like 0s and 1s).1

In electronics, analog circuits modify these continuously varying signals. For instance, a microphone converts sound into an electrical signal, which an analog circuit might amplify or filter. Analog computers, which were common before digital computers, used these variable physical quantities to model and solve problems.23

Analog modulation is used in telecommunications to transmit analog signals, like voice or audio, by varying a carrier wave's amplitude or frequency. While many modern systems digitize signals, analog transmission is still used.45

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5 Britannica Sources
  1. analog computer
  2. telecommunication - Analog modulation
  3. telecommunication - Sampling
  4. integrated circuit - Analog versus digital circuits
  5. analog

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