E T UNIT 6 P C. Multimedia T E C H O N O L O G Y DPW

Transcription

1 UI 6 Multimedia DW

2 Sound ards rovide the analog to digital conversion to play audio Use sampling for digital conversion Most cards use wavetable synthesis to reproduce analog sound Require a codec to work properly DW

3 ompression Methods M- used for D audio M- - resolutions of 0x480 and 80x0 at 60 fps, with full D-quality audio used by DVD-RMs. M- can compress a hour video into a few gigabytes. M-3 - designed for DV but no longer used M-4 - transmits streaming video and can mix video with text, graphics and -D and 3-D animation layers. M3 provides a 0: compression ratio with very little loss of quality DW

4 D-RM Drives D-RMs are read-only hase-dual ptical devices D-RMs store data only on the bottom of the D he surface of a D-RM stores data as lands (raised areas) and pits (recessed areas), each representing a or 0 respectively D-RMs are laid out as one continuous spiral of sectors of equal length that hold equal amounts of data DW

5 D-RM Drives DW

6 D-RM Drives A laser beam inside the drive distinguishes the lands and pits by the amount of deflection or scattering when it hits the surface A small motor powers an actuator arm that moves the laser beam to the sector to be read he speed of the spinning disc is altered so that the arm spends the same amount of time over any sector creating a constant linear velocity (V) DW

7 D-RM Interfaces ID interface can share an ID adapter cable with a hard drive, usually as a slave drive SSI interface using a SSI host adapter SSI interface with the connection housed on a sound card A proprietary expansion card that works only with D-RMs from a particular manufacturer A proprietary connection on a sound card USB or firewire interface for external drives DW

8 D-RM Drives eadphone Jack mergency ject ole Volume Busy Indicator oad/ject Disc ray DW

9 D-RM Drives Audio ut Jumper ID onnector ower onnector DW

10 DVD echnology Digital Versatile Disc echnology is designed to replace several other technologies such as R-RMs with DVD-RM Audio Ds with DVD-Audio Video aser Discs - DVD-V DR with DVD-R D-RW with DVD-RAM DW

11 DVD echnology Same physical size as a D-RM disc olds up to 5 times as much information Up to 9 times faster an read and play existing D-RM and D audio and R-RW formats Uses either the DFS (ompact Disk File System or UDF (Universal Disk file system) just like Ds DW

12 Digital Video Disc A digital video disc (DVD) is a storage medium with 8 B or more of storage ne DVD can store a full-length movie DVD drives can read regular Ds and may ultimately replace Ds DVDs have a shorter wavelength laser that can read smaller, more densely packed bits and there is a second opaque layer that can hold data almost doubling the disc s capacity DW

13 Digital Video Disc Minimum requirements for DVD are A DVD drive A SSI controller An M- controller A video ard he DVD drive is attached SSI controller that allows the data to go straight to the M- decoder he M- sends video data to the video controller card and sound data to a DA on the card that directs the analog sound signal to the speakers DW

14 USB Devices Most new peripheral devices connect to a using a USB port Digital ameras M3 players Flash Drives rinters Scanners Mice Keyboards DW

15 USB connector USB mass storage controller device est points Flash memory chip rystal oscillator maintains Kz clock signal D produces visible light Write-protect switch (ptional) Space for second flash memory chip Flash Drives DW

16 Digital Video Disc A digital video disc (DVD) is a storage medium with 8 B or more of storage ne DVD can store a full-length movie DVD drives can read regular Ds and may ultimately replace Ds DVDs have a shorter wavelength laser that can read smaller, more densely packed bitsand there is a second opaque layer that can hold data almost doubling the disc s capacity DW

17 Digital Video Disc Minimum requirements for DVD are A DVD drive A SSI controller An M- controller A video ard he DVD drive is attached SSI controller that allows the data to go straight to the M- decoder he M- sends video data to the video controller card and sound data to a DA on the card that directs the analog sound signal to the speakers DW

18 Video omponents Video ard Receives data and instructions from the U rocesses the data Sends the results to the monitor raphics accelerators A video card with its own processor designed to manage and speed up video and graphics Video memory n-board memory chips Direct relationship between resolution and video memory needed DW

19 icture reation Digital data is transmitted from the U to the Video chip set he data is written to the video memory Data passed to the RAM DA for analog to digital conversion Data then sent to the monitor as an analog stream to be drawn on the screen DW

20 Image Sensing Image sensing may be done using either an infrared sensor or chargecoupled device (D) An image sensor is made up of three sensors that each filter a different color (red, green, or blue) he image sensor captures the light and converts it into analog voltage signals that will eventually be converted to pixels DW

21 Image Sensing hese signals are then amplified and buffered ext, the signals enter the AD where they are digitized he digital pixels are then processed by the image processor and stored A device driver must be installed on the so it read from the device storage area of the camera DW

22 Digital ameras he camera view is essentially scanned and then recorded in bits and bytes First select the resolution and compression level on the camera Frame the picture using the camera s viewfinder or D screen and take the shot he image will be digitized and recorded as a file ransfer the image to the Use image-editing software to touch up the picture icture files will usually be in saved J (Joint hotographic xperts roup) format he picture can now be imported into documents DW

23 aser rinter rocess leaning - the drum is cleaned of residual toner by a blade that scrapes the toner off and electrical charge by a resistor blade that absorbs onditioning - the drum is conditioned to contain a high electrical charge Writing - a laser beam is used to reduce the high charge down to a lower charge in those places where the toner is to go DW

24 aser rinter rocess Developing - toner is placed onto the drum where the charge has been reduced and a control blade prevents excessive toner from sticking to the cylinder surface ransferring - a strong electrical charge draws the toner off the drum onto the paper. Fusing - heat and pressure are used to fuse the toner to the paper DW

25 aser rinters DW

26 Inkjet printers iquid ink is forced out of carefully aligned nozzles olor printers use cyan, magenta and yellow inks he print head moves back and forth over the paper printing one horizontal line at a time igh-end printers use iezo-electric technology to spray quick drying absorbent resistant ink heaper models use thermal technology that heats the ink until a bubble bursts and is forced onto the paper DW

27 Ink Jet rinters Ink is sprayed onto the paper aper Rollers rint head nozzle detail Melted ink is forced out to spray against the paper; each droplet is about one-millionth of a normal drop Resistor creates heat that vaporizes some of the ink from the reservoir DW

28 RAID (Redundant Array of Inexpensive Disks) RAID 0 (Volume Set) - A drive configuration of two or more parts (up to 3) of one or more drives or two or more entire drives Data is written to the first drive in the volume until it is full, then it continues on the next volume Does not provide any fault tolerance DW

29 RAID - Mirroring and Duplexing Mirroring Duplexing DAA DAA Drive 0 Drive Drive 0 Drive DW

30 RAID 5 - Disk Striping With arity DAA DW

31 Dynamic Storage ew type of storage technique that does not use partitions Views an entire physical hard drive as a single entity, labeled as a volume ffers drive structures from simple volumes to fully fault tolerant RAID 5 configurations an be expanded without rebooting Accessible only to Windows 000 or higher ou create a dynamic disk by upgrading a basic disk DW

32 Windows 98 Architecture User Interface ools Virtual Machine Manager Installable File System Manager Applications 3 bit Shell Windows 98 ore Device Drivers ardware WDM Device Driver Manager Registry onfiguration Manager DW

33 Windows Family Architecture DW