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TM112: Block 2 > Part 3, Mobile phones and how we use them > Flashcards

Part 3, Mobile phones and how we use them Flashcards

1
Q

what is phubbing

A

It is the act of ignoring your partner in order to pay attention to your phone

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2
Q

some other challenges may be

  1. weather such as thick and thundery clouds where signal can be interfered or reflected
  2. overload or outage - such as to many users on a network or a base station broken or being out of service
A

excluding urban and countryside challenges what else might restrict signal coverage

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3
Q

If an image sensor has 2560 columns and 1920 rows of pixel sensors what size will the image be

A

if an image is 2560 X 1920 pixels how many pixel senors did the image sensor have

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4
Q

is the total amount of pixels in the image, found by multiplying both quantities of pixels together

A

what is the resolution of an image

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5
Q

Its data rate is from several Mbps to several hundred Mbps

A

what is the data rate of wi-fi direct

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6
Q

what is a Digital signal processor (DSP)

A

this takes digital information such as audio, video, pressure or position and manipulates it so that it can be displayed analysed or converted into a different type of signal

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7
Q

Its indoor range is tens of metres although an outdoor range can be several times higher

A

what is the range of wi-fi direct

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8
Q

the most common type used today is

active pixel sensor (APS)

A

what is the most common type of image sensor used today

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9
Q

what is an image sensor

A

this is the heart of a smartphone camera and is what enables the capturing of light into an image

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10
Q

what are active pixel sensor (APS) image sensors made from

A

these are made from

complementary metal oxide semiconductor (CMOS)

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11
Q

explain briefly how accelerometers work in mobile phones

A

these work by having a mass levitated above a silicon chip by springs. When a force is applied the mass moves in the opposite direction. The mass will have a finger that lies between two other fingers that are connected to the silicon chip by measuring the capacitance between the fingers its possible to know the direction.

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12
Q

inside this you may find

  1. Central processing unit (CPU)

2. Graphics processing unit (GPU)

3. Digital signal processor (DSP)

A

what three components might you find on a system on a chip

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13
Q

what security does bluetooth use

A

This uses encryption as well as a pairing process which involves the same pin being entered by each device before transmission

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14
Q

this can convert light into a electrical current

A

what is the job of the photodiode within a pixel sensor

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15
Q

what is a typical data rate of bluetooth

A

this has a typical data rate of 24 Mbps

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16
Q

what is a system in a package

A

this is a single chip that will contain various processors, memory and possibly hardware such as radio frequency (RF) transcievers

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17
Q

what is a pixel sensor made up of

A

this is made up of a photodiode

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18
Q

these allow for a point to point or peer to peer connection

A

what does wi-fi direct, bluetooth and NFC allow for

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19
Q

what is the name given to the type of gyroscope that is built into todays phones

A

this uses an MEM sensor of type Coriolis vibratory gyroscope (CVG)

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20
Q

what security does NFC use

A

This has no encryption built in and so to mitigate eavesdropping the devices must operate in as close proximity as possible

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21
Q

what is the range of NFC

A

Its range is a few centimetres

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22
Q

where was the name bluetooth derived from

A

Its name is derived from king harald bluetooth who united Scandinavians. As the engineers who worked on bluetooth wanted to unite pc and cellular industries with a short range wireless link

How well did you know this?
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23
Q

these are made from

complementary metal oxide semiconductor (CMOS)

A

what are active pixel sensor (APS) image sensors made from

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24
Q

what are Micro-electro-mechanical sensors (MEMS)

A

these are tiny sensors that are made of tiny moving parts and etched onto silicon chips. They are used to detect some kind of physical property and translate the change into an electrical signal

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25
Q

It is the act of ignoring your partner in order to pay attention to your phone

A

what is phubbing

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26
Q

these work by allowing pressure from a finger to connect two thin conducting layers and in turn causing a change in electrical resistance at that point and so a touch can be detected. (note this type of touchscreen can work with gloves on)

A

explain how resistive touch screens work

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27
Q

what three components might you find on a system on a chip

A

inside this you may find

  1. Central processing unit (CPU)

2. Graphics processing unit (GPU)

3. Digital signal processor (DSP)

How well did you know this?
1
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2
3
4
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28
Q

what is the resolution of an image

A

is the total amount of pixels in the image, found by multiplying both quantities of pixels together

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

what is the data rate of wi-fi direct

A

Its data rate is from several Mbps to several hundred Mbps

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

this has a typical data rate of 424kbps

A

what is the typical data rate of NFC

How well did you know this?
1
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2
3
4
5
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31
Q

this takes digital information such as audio, video, pressure or position and manipulates it so that it can be displayed analysed or converted into a different type of signal

A

what is a Digital signal processor (DSP)

How well did you know this?
1
Not at all
2
3
4
5
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32
Q

what is the range of wi-fi direct

A

Its indoor range is tens of metres although an outdoor range can be several times higher

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

This has no encryption built in and so to mitigate eavesdropping the devices must operate in as close proximity as possible

A

what security does NFC use

How well did you know this?
1
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2
3
4
5
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34
Q

these are used to detect acceleration or a change in velocity (velocity being a speed in a given direction). this therefore enables the detection of tilting shaking and other motion gestures

A

what are MEMS accelerometer used for

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35
Q

if an image is 2560 X 1920 pixels how many pixel senors did the image sensor have

A

If an image sensor has 2560 columns and 1920 rows of pixel sensors what size will the image be

How well did you know this?
1
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2
3
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36
Q
  1. Reducing the power or turning of high power draining components
  2. Operating system with better power management
A

what two ways can a battery be used more efficiently

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37
Q

what is an image sensor made up of

A

this is made up of pixel sensors

How well did you know this?
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38
Q

this uses wi-fi protected access 2 (WPA2) for encryption and authentication

A

what does wi-fi direct use as security

How well did you know this?
1
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2
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39
Q

what is the job of the photodiode within a pixel sensor

A

this can convert light into a electrical current

40
Q

this stands for

complementary metal oxide semiconductor active pixel sensor image sensor

A

what does CMOS APS image sensor stand for

41
Q

challenges include

  1. weak signal due to less infrastructure
  2. natuarl features blocking signals such as rocks and hills
A

what are some challenges regarding coverage in the countryside

42
Q

what is a Analogue-to-digital converter (ADC) used for

A

this converts analogue signals to digital signals

43
Q

what two ways can you reduce the charge time of a battery

A
  1. Using catalyst to speed up the chemical reaction (usually involves precious metals so is expensive)
  2. Using nanotechnology to increase the surface area of the material in turn speeding up the chemical reaction
44
Q

challenges include

  1. deadspots due to buildings or thick or metal walls
  2. signal jamming by an owner
A

what are some challenges regarding mobile signal coverage in urban ares

45
Q

Its range is a few centimetres

A

what is the range of NFC

46
Q

what is a typical range of bluetooth

A

This has a typical range of 10 metres

47
Q

these work by having a mass levitated above a silicon chip by springs. When a force is applied the mass moves in the opposite direction. The mass will have a finger that lies between two other fingers that are connected to the silicon chip by measuring the capacitance between the fingers its possible to know the direction.

A

explain briefly how accelerometers work in mobile phones

48
Q
A

name as many components of a smartphone as you can

49
Q

to perform this operation it uses

  1. Analogue-to-digital converter (ADC)
  2. Digital-to-analogue converter (DAC)
A

what two components does a smartphone use to convert analouge signals to digital signals and vice versa

50
Q

excluding urban and countryside challenges what else might restrict signal coverage

A

some other challenges may be

  1. weather such as thick and thundery clouds where signal can be interfered or reflected
  2. overload or outage - such as to many users on a network or a base station broken or being out of service
51
Q

what are some challenges regarding coverage in the countryside

A

challenges include

  1. weak signal due to less infrastructure
  2. natuarl features blocking signals such as rocks and hills
52
Q

the need for this comes because they now have more functionality

A

why is there a need for an operating system on a smartphone

53
Q

these are tiny sensors that are made of tiny moving parts and etched onto silicon chips. They are used to detect some kind of physical property and translate the change into an electrical signal

A

what are Micro-electro-mechanical sensors (MEMS)

54
Q

what does wi-fi direct, bluetooth and NFC allow for

A

these allow for a point to point or peer to peer connection

55
Q

what two components does a smartphone use to convert analouge signals to digital signals and vice versa

A

to perform this operation it uses

  1. Analogue-to-digital converter (ADC)
  2. Digital-to-analogue converter (DAC)
56
Q

what is inertia

A

this is the resistance of a mass to a change in its current direction

57
Q

name as many components of a smartphone as you can

58
Q

what is a typical size of an image sensor

A

the typical size of this is 11mm x 8mm

59
Q

this is made up of pixel sensors

A

what is an image sensor made up of

60
Q

This uses encryption as well as a pairing process which involves the same pin being entered by each device before transmission

A

what security does bluetooth use

61
Q

explain how resistive touch screens work

A

these work by allowing pressure from a finger to connect two thin conducting layers and in turn causing a change in electrical resistance at that point and so a touch can be detected. (note this type of touchscreen can work with gloves on)

62
Q

how can a smartphone be described

A

this could be described as a device that shares many features of a desktop computer such as

  1. access to internet
  2. operating system
  3. subsytsems that carry out particular tasks
63
Q

this can be found by dividing both pixel quantities by the same amount

A

what is the aspect ratio

64
Q

brifly explain how Coriolis vibratory gyroscope (CVG) works

A

It works by having a MEM fixed to a free spinning disc. When the phone is tilted or rotated it is able to measure a force known as Coriolis force

65
Q

explain briefly how a capactive touch screen works

A

this involves having two thin layers of glass with a conductive material such as indium tin oxide (ITO) placed as thin lines on each peice of glass note the lines are placed parallel to each other forming a grid. The lines are charged and when you press with your finger some of that charge is passed to your finger. Software can then detect the voltage drop and detect where the screen was touched

66
Q

it produces coloured images by closely packaging together three pixel sensors which each have a different colour filter (red, green, blue).

the three pixel senors then act as one pixel and produce any colour by combining the intensitys of each colour that was filtered

A

how does an image sensor produce couloured images

67
Q

this could be described as a device that shares many features of a desktop computer such as

  1. access to internet
  2. operating system
  3. subsytsems that carry out particular tasks
A

how can a smartphone be described

68
Q

what two ways can a battery be used more efficiently

A
  1. Reducing the power or turning of high power draining components
  2. Operating system with better power management
69
Q

what is the most common type of image sensor used today

A

the most common type used today is

active pixel sensor (APS)

70
Q

this is a single chip that will contain various processors, memory and possibly hardware such as radio frequency (RF) transcievers

A

what is a system in a package

71
Q

what is a system on a chip

A

this is a single chip that will contain components such as processors

72
Q

what are some challenges regarding mobile signal coverage in urban ares

A

challenges include

  1. deadspots due to buildings or thick or metal walls
  2. signal jamming by an owner
73
Q

this is a single chip that will contain components such as processors

A

what is a system on a chip

74
Q

what does wi-fi direct use as security

A

this uses wi-fi protected access 2 (WPA2) for encryption and authentication

75
Q

this is a technique that is used to try and improve reception in dead spots. They are basically small base stations that provide a radio interface and connect users to mobile networks via a broadband connection

A

what is a femtocell

76
Q

this converts digital signals into analogue signals

A

what is a Digital-to-analogue converter (DAC)

77
Q

the typical size of this is 11mm x 8mm

A

what is a typical size of an image sensor

78
Q

what is a Digital-to-analogue converter (DAC)

A

this converts digital signals into analogue signals

79
Q

this is the resistance of a mass to a change in its current direction

A

what is inertia

80
Q

what does CMOS APS image sensor stand for

A

this stands for

complementary metal oxide semiconductor active pixel sensor image sensor

81
Q

what is the typical data rate of NFC

A

this has a typical data rate of 424kbps

82
Q

this converts analogue signals to digital signals

A

what is a Analogue-to-digital converter (ADC) used for

83
Q

how does an image sensor produce couloured images

A

it produces coloured images by closely packaging together three pixel sensors which each have a different colour filter (red, green, blue).

the three pixel senors then act as one pixel and produce any colour by combining the intensitys of each colour that was filtered

84
Q

what is the aspect ratio

A

this can be found by dividing both pixel quantities by the same amount

85
Q

this is the heart of a smartphone camera and is what enables the capturing of light into an image

A

what is an image sensor

86
Q

It works by having a MEM fixed to a free spinning disc. When the phone is tilted or rotated it is able to measure a force known as Coriolis force

A

brifly explain how Coriolis vibratory gyroscope (CVG) works

87
Q

why is there a need for an operating system on a smartphone

A

the need for this comes because they now have more functionality

88
Q

what is a femtocell

A

this is a technique that is used to try and improve reception in dead spots. They are basically small base stations that provide a radio interface and connect users to mobile networks via a broadband connection

89
Q
  1. Using catalyst to speed up the chemical reaction (usually involves precious metals so is expensive)
  2. Using nanotechnology to increase the surface area of the material in turn speeding up the chemical reaction
A

what two ways can you reduce the charge time of a battery

90
Q

this involves having two thin layers of glass with a conductive material such as indium tin oxide (ITO) placed as thin lines on each peice of glass note the lines are placed parallel to each other forming a grid. The lines are charged and when you press with your finger some of that charge is passed to your finger. Software can then detect the voltage drop and detect where the screen was touched

A

explain briefly how a capactive touch screen works

91
Q

this has a typical data rate of 24 Mbps

A

what is a typical data rate of bluetooth

92
Q

This has a typical range of 10 metres

A

what is a typical range of bluetooth

93
Q

this is made up of a photodiode

A

what is a pixel sensor made up of

94
Q

this uses an MEM sensor of type Coriolis vibratory gyroscope (CVG)

A

what is the name given to the type of gyroscope that is built into todays phones

95
Q

what are MEMS accelerometer used for

A

these are used to detect acceleration or a change in velocity (velocity being a speed in a given direction). this therefore enables the detection of tilting shaking and other motion gestures

96
Q

Its name is derived from king harald bluetooth who united Scandinavians. As the engineers who worked on bluetooth wanted to unite pc and cellular industries with a short range wireless link

A

where was the name bluetooth derived from

TM112: Block 2 (7 decks)

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