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carrier signal/wave
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- a periodic waveform
- is used to transmit information through space
- a communication medium
- the carrier signal is higher in frequency than the modulation signal
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modulation signal/wave
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- contains information to be transmitted
- types of modulation signals: audio signal, video signal, or a digital signal
- a modulation signal of any type is transmitted via a carrier signal
- the modulation signal is lower in frequency than the carrier signal
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modulate
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- the impressing of the information-bearing modulation signal onto a carrier wave
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demodulation/demodulate
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- the extraction of the information-bearing modulation signal from a carrier signal
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modulator
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- is a device that performs modulation
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demodulator
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- is a device that performs demodulation
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modem (modulator-demodulator)
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- is a device that performs modulation and demodulation
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baseband
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- the frequency band occupied by the modulation signal
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passband
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- the higher frequency band occupied by the modulated carrier
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