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COMMS > COMMS > Flashcards

COMMS Flashcards

1
Q

_______is the process of exchanging information. Main barriers are language and distance.

A

Communication

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2
Q

degrades or interferes with transmitted information.

A

Noise

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3
Q

converts the electrical signal into a signal suitable for transmission over a given medium.

A

Transmitter

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4
Q

made up of oscillators, amplifiers, tuned circuits and filters, modulators, frequency mixers, frequency synthesizers, and other circuit

A

Transmitter

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5
Q

the electronic signal is
sent from one place to another.

A

Communication Channel

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6
Q

accepts the transmitted message from the channel and converts it back into a form understandable by humans.

A

Receiver

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7
Q

contain amplifiers, oscillators, mixers, tuned circuits and filters, and a demodulator or detector that “recovers the original intelligence signal from the modulated carrier”.

A

Receiver

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8
Q

incorporates circuits that both send
and receive signals.

A

Transceiver

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9
Q

Signal ____________, or degradation, exists in all media of wireless transmission. It is proportional to the square of the distance between the transmitter and receiver.

A

Attenuation

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10
Q

is random, undesirable electronic energy that enters the
communication system via the communicating medium and “interferes with the transmitted message”.

A

Noise

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11
Q

simplest method of electronic communication, “one way” communication

A

Simplex

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12
Q

“two-way” communication, it is when people can talk and listen simultaneously

A

Full Duplex

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13
Q

form of two-way communication in which “only one party transmits at a time”

A

Half Duplex

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14
Q

is a smoothly and continuously varying voltage or current.

A

Analog Signal

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15
Q

change in steps or in discrete increments

A

Digital Signals

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16
Q

Most digital signals use __________ or ____________

A

binary or two-state codes.

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17
Q

Many transmissions are of signals that originate in digital form but must be converted to analog form to match the transmission medium.

A

Digital Signals

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18
Q

are electronic techniques for transmitting information efficiently from one place to another.

A

Modulation and Multiplexing

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19
Q

makes the information signal more compatible with the medium.

A

Modulation

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20
Q

allows more than one signal to be transmitted concurrently over a single medium.

A

Multiplexing

21
Q

can be “sent directly and unmodified” over the medium or can be used to modulate a carrier for transmission over the medium.

A

Baseband Transmission

22
Q

is a high frequency signal that is modulated by audio, video, or data.

A

carrier

23
Q

is an electromagnetic signal that is able to travel long distances through space.

A

radio-frequency (RF) wave or radio wave

24
Q

A _____________ takes place when a carrier signal is modulated, amplified, and sent to the antenna for transmission.

A

Broadband Transmission

25
Q

2 most common methods of modulation are:

A

1) Amplitude Modulation (AM)
2) Frequency Modulation (FM)

26
Q

phase angle of the sine wave is varied.

A

Phase Modulation (PM)

27
Q

takes place when data is converted to frequency-varying tones.

A

Frequency-shift keying (FSK)

28
Q

translate the data from digital to analog and back again.

A

Modems (modulator-demodulator)

29
Q

takes place in the receiver when the original baseband (e.g. audio) signal is extracted.

A

Demodulation or detection

30
Q

is the process of allowing two or more signals to share the same medium or channel.

A

Multiplexing

31
Q

3 basic types of multiplexing are:

A

1) Frequency division
2) Time division
3) Code division

32
Q

The range of electromagnetic signals encompassing all frequencies.

A

Electromagnetic Spectrum

33
Q

A ______ is located on the frequency spectrum according to its frequency and wavelength.

A

Signal

34
Q

A ________ consists of two voltage polarity reversals, current reversals, or electromagnetic field oscillations.

A

cycle

35
Q

is the number of cycles of a repetitive wave that occur in a given period of time.

A

Frequency

36
Q

Frequency is measured in _______

A

Cycles per second (cps)

37
Q

is the distance occupied by one cycle of a wave and is usually expressed in meters.

A

Wavelength

38
Q

is also the distance traveled by an electromagnetic wave during the time of one cycle.

A

Wavelength

39
Q

The wavelength of a signal is represented by the _________

A

Greek letter lambda (λ)

40
Q

exists directly above the millimeter wave region.

A

Optical Spectrum

41
Q

3 types of light waves are:

A

1) Infrared
2) Visible Spectrum
3) Ultraviolet

42
Q

is produced by any physical equipment that generates heat, including our bodies.

A

Infrared radiation

43
Q

Just above the infrared region is the ________ we refer to as “light”.

A

visible spectrum

44
Q

___ is low-frequency or long-wavelength light

A

Red

45
Q

______ is high-frequency or short-wavelength light.

A

Violet

46
Q

____________ very high frequency “enables them to handle a tremendous amount of information” (the bandwidth of the baseband signals can be very wide).

A

Light waves

47
Q

is not used for communication, primary use is medical.

A

Ultraviolet

48
Q

is that portion of the electromagnetic spectrum occupied by a signal.

A

Bandwidth (BW)

49
Q

refers to the “range of frequencies required to transmit” the desired information.

A

Channel bandwidth

COMMS (2 decks)

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