Collection Hardware: Barcode Scanners

 My Powerpoint Presentation can be viewed on the school website!

Collection Hardware

Biometrics Scanners

--> Examples:

-        - DNA

-        - Iris scanning

   * Prevents:

-        - Identity fraud

-        - Can be used for passwords

--> Modern day examples:

-        - In Walt Disney: Passes aern’t being shared

-        - Japan uses palm vein identification

-->Specifications:

-        - Scanning patterns on fingerprints .

-        - Can fool scanners, have moulds of fingerprints.

-        - Larger area

--> Functions:

-        How biometric scanner identifies the input sample by comparing it to exisiting template.

-       
     Fingerprint

*Forensics

*Security

--> Optical recognition

-        - Takes 2 seconds to scan the iris, more accurate method of fingerprint.

--> Fallbacks

-        - Difficulty scanning because of glasses and contacts

Voice Recorder & Microphones

--> Typical use:

 - Record and playback of data that is fed to the voice recorder verbally.

--> Applications:

-        - Pen recorder

-        - Black box

-        - Camera phone

-        - Cellular phone

-        -  Hearing aids

--> Data transferred:

-        - Through USB interface from hardware to computer.

-        - Talking directly into the voice recorder.

-        - Entertainment purposes

Carbon Microphones:

Dynamic Microphones:

Ribbon Microphones:

Condenser Microphones:

Crystal Microphones

Vibrating air particles converted in signals

BLACK BOXES:

-        - Time

-        - Pressure altitude

*Bigger sample- more variations

Note: When digitising sound, we need to consider the following:

-  Mono or stereo

-  Sample rate (bits per second), the higher the sample rate, more true to life! E.G. 144kb/s

-  Sample Size (kilo bits, Mega bits): Larger SS, more variations are allowed: E.G. High or Low frequencies, loud or soft. [To know in the exam] E.G. 16 Bits

      Digital Instruments

        

-->  Uses:

-        - Anywhere live music is there.

-        - School’s music department.

-        - Midi Files are a text document, using little disk space.

-        - BUT you need MIDI compatible hardware or software to record and playback MIDI files.

      Graphics Tablet

-        - Also called a digitizing tablet

-        - Alternate input device allowing you to draw hand draw images & other graphics.

 --> Uses:

-        - In East Asia, different characters.

-        - Artists use it in conjunction with Adobe.

-        - Also used for Audio Haptic products where blind or visually impaired people touch swelled graphics on a graphic tablet and get audio feedback from it.

--> Types:

-        - Passive

-        - Active

-        - Optical Acoustic

-        - Electromagnetic

-        * Received signal can also determine distance of stylus from surface of tablet, tilt etc....

--> Data Transfer:

-        - Transferred through USB interface which connects tablet to computer

-        - Transferred through Bluetooth of tablet.

-        - Finer detail, accurate image

--> Specifications:

-        -  Resolution

  Camera; Still & Video

--> Uses:

-        - STILL: capturing still images

-        - Capturing video

-        - Recording video

-        - VIDEO: capturing video & sound

--> Types:

-        - STILL: SLR, DSLR

-        - VIDEO: Camcorders, high definition video camera, closed circuit television camera

--> BITTER OPTICS: Digital SLR

-->Specifications

-        - STILL: Average 10-14 megapixels

-        - Av. 3-6 times optical zoom ( physical lens moving)

-        - Records sound

-        - VIDEO: HD or SD video

-        - Stereo sound capture

-        - Different file formats

-        -Averages between 20-200 frames/second

--> Data Transfer:

-        - USB cable

-        - HDMI cable- HDTV’s

-        - RCA cable

-        - Wi-Fi connectivity

-        - Memory card

-        - PictBridge connectivity for digital still cameras

- CCD Device: light sensitive, push button, light, current ( analogue signal)a digital signal  - Image, cameras have onboard processer, and processes. IS CAPTURING ANALOGUE - - INFO- LIGHT, converting into digital format!

Keyboards & Mouse

--> Mouse:

-        - Light emitting diode+ photodiodes to detect movements relative to underlying surface rather than moving some of its parts as in a mechanical mouse.

--> Keyboards:

-        - Are connected to the computer via wires and cords. These W& C transmit info. To computer so that it appears on the screen.

-        - Most Keyboards allow 250 characters, press SHIFT.

-        - Different types of keyboards:

-        QWERTY

-        DOBARIC – common letters in the home row!

 RFID: Radio Frequency Identification

 Small electronic devices that contain a chip.

--> Uses:

-       - In car

-       - Animal tracking tags

-       - Credit Card shaped for use in applications

-       - E-tags; has  a battery: receives signal, then transmits

-         

--> Specifications:

-        - RFID Tags

-        - Then antenna picks it up

-        - Computer picks it up

--> Consists of:

-        - An antenna or cord

-        - Transceiver ( with decoder)

-        - A transponder ( RF Tag) electronically programmed with unique information. [label]

-        - Must have RFID receiver on computer which can decode the signal.

-        - Different levels of frequency determines what that particular RFID is used for (low. Med, high).

--> How is data transferred?

-        - Car goes through etag scanner, sending number to receiver, its matched up (database) this 12 digit number matches up with the car (number plate).

Scanners:

--> Types:

-        - Sheet : Can scan photos

-        - Flatbed: Books that are bound.

-        - Handheld:

-        - Pen based

--> How it works:

-        - CCD- records, produces light- then the CCD receives the reflected light.

-        - Light source

-        - Guide rails

-        - Motor

-        Toothed belt

-        Toothed pulley

--> Data transfer

-        USB