Term
| Methods of Communications |
|
Definition
Face to Face
Signals
Letters (Written words)
Electrical Innovations (Telegraph, Telephone, Radio, Television, Internet) |
|
|
Term
| The year telegraph was invented |
|
Definition
|
|
Term
|
Definition
|
|
Term
|
Definition
| first round-the-world call |
|
|
Term
| Basic components of Electronic Communications |
|
Definition
Transmitter
Channel or medium
Receiver |
|
|
Term
|
Definition
| a collection of electronic components and circuits that converts the electrical signal into a signal suitable for transmission over a given medium |
|
|
Term
|
Definition
| medium by which the electronic signal is sent from one place to another |
|
|
Term
|
Definition
| a collection of electronic components and circuits that accepts the transmitted message from the channel and converts it back into a form understandable by humans |
|
|
Term
|
Definition
| an electronic unit that incorporates circuits that both send and receive signals |
|
|
Term
|
Definition
Telephones
Fax machines
Handheld CB radios
Cell Phones
Computer modems |
|
|
Term
|
Definition
Electrical conductors
Optical media
Free space
System-specific media (e.g., water is the medium of sonar) |
|
|
Term
|
Definition
| Signal attenuation, or degradation, exists in all media of wireless transmission, It is proportional to the square of the distance between the transmitter and receiver |
|
|
Term
|
Definition
| it is random, undesirable electronic energy that enters the communication system via the communicating medium and interferes with the transmitted message |
|
|
Term
| Types of Electronic Communication |
|
Definition
Simplex
Full duplex
Half duplex
Analog
Digital |
|
|
Term
|
Definition
| the simplest method of electronic communication. This type is a one-way communication |
|
|
Term
|
Definition
Radio
TV broadcasting
Beeper (personal receiver) |
|
|
Term
|
Definition
two-way communication.
When people can talk and listen simultaneously, it is called full duplex. |
|
|
Term
|
Definition
|
|
Term
|
Definition
| The form of two-way communication in which only one party transmits at a time is known as half duplex |
|
|
Term
|
Definition
Police, military, etc., radio transmissions
Citizen band (CB)
family radio
Amateur radio |
|
|
Term
|
Definition
| An analog signal is a smoothly and continuously varying voltage or current |
|
|
Term
| Examples of Analog Signal |
|
Definition
|
|
Term
|
Definition
| Digital signals change in steps or in discrete increments. Most digital signals use binary or two-state codes. |
|
|
Term
| Examples of Digital Signals |
|
Definition
Telegraph ( Morse Code )
Continuous wave (CW) code
Serial binary code (used in computers) |
|
|
Term
|
Definition
| it makes the information signal more compatible with the medium |
|
|
Term
|
Definition
| it allows more than one signal to be transmitted concurrently over a single medium |
|
|
Term
|
Definition
| baseband information can be sent directly and unmodified over the medium or can be used to modulate a carrier for transmission over the medium. |
|
|
Term
| (Broadband Transmission) Carrier |
|
Definition
| A carrier is a high frequency signal that is modulated by audio, video, or data |
|
|
Term
| (Broadband Transmission) Radio-frequency |
|
Definition
| RF wave is an electromagnetic signal that is able to travel long distances through space |
|
|
Term
|
Definition
| (modulator-demodulator) translate the data from digital to analog and back again |
|
|
Term
|
Definition
| Demodulation or detection takes place in the receiver when the original baseband (e.g. audio) signal is extracted |
|
|
Term
|
Definition
| it is the process of allowing two or more signals to share the same medium or channel |
|
|
Term
| 3 basic types of multiplexing |
|
Definition
Frequency division
Time division
Code division |
|
|
Term
|
Definition
| it is the range of electromagnetic signals encompassing all frequencies |
|
|
Term
|
Definition
| the number of cycles of a repetitive wave that occur in a given period of time |
|
|
Term
|
Definition
| the distance occupied by one cycle of a wave and is usually expressed in meters |
|
|
