Principles of Communications History in Engineering
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Questions and Answers

Transmitter, the channel, and a ______ are three major subsystems in information transmission systems.

receiver

Messages may be categorized as ______ or digital.

analog

The message produced by a source must be converted by a ______ to a form suitable for communication systems.

transducer

In electrical communications, speech waves are converted by a ______ to voltage variations.

<p>microphone</p> Signup and view all the answers

The signal can be interpreted as the variation of a quantity, often a voltage or current, with ______.

<p>time</p> Signup and view all the answers

Common examples of input transducers include ______, camera, and keyboard.

<p>microphone</p> Signup and view all the answers

The purpose of the transmitter is to couple the message to the ______.

<p>channel</p> Signup and view all the answers

Modulation is the systematic variation of some attribute of the ______, such as amplitude, phase, or frequency.

<p>carrier</p> Signup and view all the answers

There are several reasons for using a carrier and ______ it.

<p>modulating</p> Signup and view all the answers

In radio communication, modulation schemes are used to encode information onto the ______.

<p>carrier</p> Signup and view all the answers

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