Part 3, Mobile phones and how we use them Flashcards
what is phubbing
It is the act of ignoring your partner in order to pay attention to your phone
some other challenges may be
- weather such as thick and thundery clouds where signal can be interfered or reflected
- overload or outage - such as to many users on a network or a base station broken or being out of service
excluding urban and countryside challenges what else might restrict signal coverage
If an image sensor has 2560 columns and 1920 rows of pixel sensors what size will the image be
if an image is 2560 X 1920 pixels how many pixel senors did the image sensor have
is the total amount of pixels in the image, found by multiplying both quantities of pixels together
what is the resolution of an image
Its data rate is from several Mbps to several hundred Mbps
what is the data rate of wi-fi direct
what is a Digital signal processor (DSP)
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
Its indoor range is tens of metres although an outdoor range can be several times higher
what is the range of wi-fi direct
the most common type used today is
active pixel sensor (APS)
what is the most common type of image sensor used today
what is an image sensor
this is the heart of a smartphone camera and is what enables the capturing of light into an image
what are active pixel sensor (APS) image sensors made from
these are made from
complementary metal oxide semiconductor (CMOS)
explain briefly how accelerometers work in mobile phones
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.
inside this you may find
- Central processing unit (CPU)
2. Graphics processing unit (GPU)
3. Digital signal processor (DSP)
what three components might you find on a system on a chip
what security does bluetooth use
This uses encryption as well as a pairing process which involves the same pin being entered by each device before transmission
this can convert light into a electrical current
what is the job of the photodiode within a pixel sensor
what is a typical data rate of bluetooth
this has a typical data rate of 24 Mbps
what is a system in a package
this is a single chip that will contain various processors, memory and possibly hardware such as radio frequency (RF) transcievers
what is a pixel sensor made up of
this is made up of a photodiode
these allow for a point to point or peer to peer connection
what does wi-fi direct, bluetooth and NFC allow for
what is the name given to the type of gyroscope that is built into todays phones
this uses an MEM sensor of type Coriolis vibratory gyroscope (CVG)
what security does NFC use
This has no encryption built in and so to mitigate eavesdropping the devices must operate in as close proximity as possible
what is the range of NFC
Its range is a few centimetres
where was the name bluetooth derived from
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
these are made from
complementary metal oxide semiconductor (CMOS)
what are active pixel sensor (APS) image sensors made from
what are Micro-electro-mechanical sensors (MEMS)
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
It is the act of ignoring your partner in order to pay attention to your phone
what is phubbing
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)
explain how resistive touch screens work
what three components might you find on a system on a chip
inside this you may find
- Central processing unit (CPU)
2. Graphics processing unit (GPU)
3. Digital signal processor (DSP)
what is the resolution of an image
is the total amount of pixels in the image, found by multiplying both quantities of pixels together
what is the data rate of wi-fi direct
Its data rate is from several Mbps to several hundred Mbps
this has a typical data rate of 424kbps
what is the typical data rate of NFC
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
what is a Digital signal processor (DSP)
what is the range of wi-fi direct
Its indoor range is tens of metres although an outdoor range can be several times higher
This has no encryption built in and so to mitigate eavesdropping the devices must operate in as close proximity as possible
what security does NFC use
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
what are MEMS accelerometer used for
if an image is 2560 X 1920 pixels how many pixel senors did the image sensor have
If an image sensor has 2560 columns and 1920 rows of pixel sensors what size will the image be
- Reducing the power or turning of high power draining components
- Operating system with better power management
what two ways can a battery be used more efficiently
what is an image sensor made up of
this is made up of pixel sensors
this uses wi-fi protected access 2 (WPA2) for encryption and authentication
what does wi-fi direct use as security
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.
explain briefly how accelerometers work in mobile phones
name as many components of a smartphone as you can
name as many components of a smartphone as you can
brifly explain how Coriolis vibratory gyroscope (CVG) works
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
explain briefly how a capactive touch screen works
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
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
how does an image sensor produce couloured images
how does an image sensor produce couloured images
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
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
brifly explain how Coriolis vibratory gyroscope (CVG) works
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
explain briefly how a capactive touch screen works
