Chapter 1: Introduction Of Electronics Communication Flashcards
_________ is the process of exchanging information.
Communication
Two main barriers are _______ and _______.
Language and distance
_____ degrades or interferes with transmitted information.
Noise
The ________ is a collection of electronic components and circuits that converts the electrical signal into a signal suitable for transmission over a given medium.
Transmitter
The _______ channel is the medium by which the electronic signal is sent from one place to another.
Communication channel
Water is the medium for _____.
Sonar
A _________ is 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.
Receiver
A electronic device incorporates circuits that both send and receive signals.
Transceiver
Signal _______, or _______, exist in all media of wireless transmission. It is proportional to the square of the distance between the transmitter and receiver.
Attenuation or degradation
The simplest method of electronic communication is referred to as _____. A one-way communication system.
Simplex
Most electronic communication is two–way and is referred to as ______.
Duplex
When people can talk and listen simultaneously it is called _________.
Full duplex
The form of two-way communication in which only one party transmits at a time is known as _____.
Half duplex
An ________ is a smoothly and continuously varying voltage or current.
Analog signal
_______ signal change in steps or in discrete increments.
Digital
_______ and __________ are electronics techniques for transmitting information efficiently from one place to another.
Modulation and multiplexing
_________ makes the information signal more compatible with the medium.
Modulation
________ allows more than one signal to be transmitted concurrently over a single medium.
Multiplexing
________ information can be sent directly and unmodified over the medium or can be used to modulate a carrier for transmission over the medium.
Baseband
A ___ is a high frequency signal that is modulated by audio, video, or data.
Carrier
A ____ wave is an electromagnetic signal that is able to travel long distances through space.
Radio frequency
A __________ takes place when a carrier signal is modulated, amplified, and sent to the antenna for transmission.
broadband transmission
Three Methods of modulation are:
Amplitude modulation
Frequency modulation
Phase modulation
__________ takes place when data is converted to frequency varying tones.
Frequency shift keying
device called ______ translate the data from digital to analog and back again.
Modems
_______ or detection takes place in the receiver when the original baseband signal is extracted.
Demodulation
The range of electromagnetic signal encompassing all frequencies is referred to as the __________.
Electromagnetic spectrum
Extremely Low Frequencies
30-300 Hz
Voice Frequencies
300 - 3000 Hz
Very Low Frequencies
3000 - 20kHz
Low Frequencies
30-300 kHz
Medium Frequencies
300-3000 kHz
High Frequencies
3 – 30 MHz
Very High Frequencies
30 -300 MHz
Ultra High Frequencies
300 3000 MHz
Microwave
1-30 GHz
Extremely High Frequencies
30 300 GHz
The _________ exist directly above the millimeter wave region.
Optical spectrum
___________ is that portion of the electromagnetic spectrum occupied by a signal.
Bandwidth
_____________ refers to the range of frequencies required to transmit the desired information.
Channel bandwidth
