Week 1

Question 1

Time domain

Answer 1

Refers to the analysis of mathematical functions, physical signals, or time series of economic or environmental data concerning time

Question 2

What refers to the analysis of mathematical functions, physical signals, or time series of economic or environmental data with respect to time?

Answer 2

The Time Domain

Question 3

What does an oscilloscope do?

Answer 3

Commonly used to visualize real-world signals in the time domain

Question 4

What is a commonly used tool to visualize real-world signals in the time domain?

Answer 4

An oscilloscope

Question 5

What shows how a signal changes with time?

Answer 5

A Time-domain graph

Question 6

What does a “Time-domain graph” show?

Answer 6

How a signal changes with time

Question 7

What shows how much signal lies within each given frequency band over a range of frequencies?

Answer 7

A frequency-domain graph

Question 8

What does a “Frequency-domain graph” show?

Answer 8

How much signal lies within each given frequency over a range of frequencies

Question 9

What do “Transforms” do?

Answer 9

Convert a function/signal between time and frequency domains using a pair of mathematical operators

Question 10

What does a “Frequency-domain representation” include?

Answer 10

Information on the phase shift that must be applied to each sinusoid to recombine the frequency components to recover the original time signal

Question 11

What is an “Analog signal”?

Answer 11

One where signal intensity varies in a smooth fashion over time

Question 12

What is the type of signal which is continuous?

Answer 12

Analog signal

Question 13

What is a “Digital signal”?

Answer 13

One where signal intensity maintains a constant level for a period of time and ten changes to another constant level

Question 14

What signal intensity varies in a smooth fashion over time?

Answer 14

Analog

Question 15

What signal intensity maintains a constant level and then changes to another?

Answer 15

Digital

Question 16

How do we represent analog signals?

Answer 16

Speech

Question 17

How do we represent digital signals?

Answer 17

Binary (1’s & 0’s)

Question 18

What type of signal repeats over time?

Answer 18

Periodic signal

Question 19

What is the opposite of a periodic signal?

Answer 19

Aperiodic

Question 20

What is a general sine wave represented by?

Answer 20

1) Peak amplitude
2) Frequency
3) Phase

Question 21

What is “peak amplitude” ?

Answer 21

Maximum value or strength of the signal over time, usually measures in volts

Question 22

What is peak amplitude measured in ?

Answer 22

Usually volts

Question 23

What is “Frequency”?

Answer 23

The rate (in cycles per second, or hertz) at which the signal repeats

Question 24

What is an equivalent parameter of frequency?

Answer 24

The “Period” of a signal

Question 25

What is the “Phase”?

Answer 25

A measure of the relative position in time within a single period of a signal

Question 26

What is a sinusoidal transmission?

Question 27

What is the “fundamental frequency”?

Answer 27

When all the frequency components of a signal are integer multiples of one frequency, the latter frequency is the fundamental frequency

Question 28

What is the spectrum of a signal?

Answer 28

The range of frequencies it contains

Question 29

What is the absolute bandwidth of a signal

Answer 29

Width of the spectrum

Question 30

What is the band referred to when the energy of contained in a relatively narrow band of frequencies?

Answer 30

Effective bandwidth, or bandwidth