It's a transceiver that can demodulate and process signal data up to 4 Gigahertz.
From the techcrunch.com
A receiver cannot demodulate this transmission without knowledge of the pseudo-random sequence used to encode the data.
From the en.wikipedia.org
Before decoding of audio and video takes place, the receiver must demodulate and apply error correction to the signal.
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The Viterbi decoder implements a soft-decision algorithm to demodulate digital data from an analog signal corrupted by noise.
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When hierarchical-modulated signals are transmitted, users with good reception and advanced receivers can demodulate multiple layers.
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For a user with a conventional receiver or poor reception, it may only demodulate the data stream embedded in the base layer.
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The BFO signal is adjusted to one side of the incoming signal, and functions as the replacement carrier needed to demodulate the signal.
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Technically, it is a modem because it must modulate data to transmit it over the cable network, and it must demodulate data from the cable network to receive it.
From the en.wikipedia.org
More examples
Extract information from a modulated carrier wave
(demodulation) (electronics) the reception of a signal by extracting it from the carrier wave
(Demodulation) Conversion of a signal from either digital or analog to its original form. Antonym: modulation.
(demodulation) The process of separating the carrier signal from the information-bearing signal.
(demodulation) When computers transmit data using standard communications systems (such as the phone system), binary data must be converted to the analog signals used by that system. This is known as modulation. ...
(Demodulation) This is the process of converting analog information (like over phone lines) into digital information (like in a computer). See "Modem" for more.
To convert a modulated signal back to an unmodulated "baseband" signal.
To remove the carrier signal and leave only baseband audio and video.
An audio or video signal is encoded onto a portion of the radio frequency spectrum in order to be transmitted. A reciever, which is what a television set is, receives the signal and demodulates it--that is, reverses the process and converts the signal back into video and audio.