question about multiplexing?

What kind of multiplexing do analog signals primarily use?  What about digital signals?
HubTechnicalAsked:
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grbladesCommented:
Hi HubTechnical,
Analogue normally uses AM (analogue modulation) where you have a high frequency signal and modify the amplitude according to the source signal, or FM (frequency modulation) where you slightly change the high frequency according to the source signal. There are also more complicated combinations of both.

Digital signals can use these methods but also use TDMA (time division multplexing) where each digital signal is sent one after the other.
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HubTechnicalAuthor Commented:
here is the practice question I'm stuck on:

Multiplexing is the subdividing of physical media  into two or more separate channels. Analog signals primarily use ______ division multiplexing while digital signals primarily use __________________division multiplexing.
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grbladesCommented:
Frequency and Time
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HubTechnicalAuthor Commented:
Are you sure?  I thought it was AM for the first?  :confused:
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grbladesCommented:
AM is where you change the amplitide of a signal according to the input signal. Each input signal is used to change the amplitude of a diffeent frequency carrier. Therefore it is still frequency division.
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