Multimedia Devices

1
Multimedia Devices

• Terms and Definitions

2
Chapter Objectives

• After completing these slides you will
• Understand various CD and DVD technologies.
• Understand the meaning of a CD or DVDs X factor.
• Understand how a CD drive works.
• Know the different interfaces used with CD and
  DVD drives and be able to configure the drive.
• Understand the basic operation of a sound card.
• Understand the software associated with CD and
  DVD drive installation.
• Be able to install a sound card.
• Be able to use various operating system tools to
  verify drive and sound card installation.

3
Multimedia Overview

• The term multimedia has different meanings to
  different people because there are so many
  different types of multimedia devices. These
  slides focus on the most popular areas and you
  will find that other devices are similar to
  install and troubleshoot.
• Multimedia devices
• CD and DVD technologies
• Sound cards

4
CD-ROM Drive Overview

• CD-ROM terms
• CD-ROM (Compact Disk-Read Only Memory) Drive is a
  device that holds CDs and is used for audio and
  data files.
• CD (Compact Disk) is a disk that holds large
  amounts of data (628MB and higher), such as
  audio, video, and software applications.

5
CD-ROM Drive Speeds

• CD-ROM drives operate much slower than hard
  drives.
• CD-ROM drive specifications
• Average Seek Time is the time required for a
  drive to move randomly about the disk.
• Average Access Time is the time required to find
  and retrieve data on a disk or in memory.

6
CD-ROM Drive Speeds
CD-ROM Transfer Speeds
Multimedia Table 1
7
CD-ROM Drive Speeds
CD-ROM Access Times
Multimedia Table 2
8
CD-ROM Drive Buffers/Cache

• Ways to increase CD-ROM data transfers
• Buffer memory located on the CD-ROM drive
• Adjust the CD-ROM cache

9
Theory of CD-ROM Drive Operation

• Data is stored on a CD with pits and flats.
• Pits are indentations along the track of a CD.
• Flats are lands that separate the pits in a CD.

10
Theory of CD-ROM Drive Operation
Inside a CD-ROM Drive
Multimedia Figure 2
11
Internal and External CD-ROM Drives

• Types of CD-ROM drives
• Internal CD-ROM drives using either IDE or SCSI
  interface
• External CD-ROM drives using the SCSI interface

12
CD-ROM Disk Loading

• Methods for inserting a compact disk into a
  CD-ROM drive
• Tray Loaded is a method to insert a CD or DVD
  into a drive. They are less expensive but more
  likely to have lower MTBFs.
• MTBF (Mean Time Between Failures) is the average
  number of hours before a device fails.
• Caddy Loaded is a term used to describe how a CD
  inserts into a CD drive using a special holder.
• Caddy is a holder for a compact disk that inserts
  into the CD drive.
• Slot Loaded is a term used to describe how a CD
  loads into a slot in the CD drive. This has the
  disadvantage of disk jams.

13
CD-ROM Disk Loading
CD-ROM Drive with Tray and CD-ROM Caddy
Multimedia Figure 3
14
CD-R and CD-RW

• CD-R (Compact Disk Recordable) is a CD drive that
  can create a compact disk by writing once to the
  disk.
• UDF (Universal Disk Format) is a CD-R drive
  standard used by some manufacturers.
• DDCD (Double Density CD) is a CD disk format that
  extends to 1.3GB. Drives that use this
  specification can also read regular CDs, CD-R
  disks, and CD-RW disks.
• WORM (Write Once-Read Many) is a technology that
  writes data once to a disk. It is often used to
  make backups or distribute software.

15
CD-R and CD-RW

• CD-RW (Compact Disk ReWritable) or CD-E is a CD
  drive that can write data multiple times to a
  particular disk.
• PD (Phase-Change Dual) is a laser technology used
  to make CD-E and CD-RW disks.
• Dye-Polymer is a technology for making CD-E or
  CD-RW disks by laser-heating the disk surface to
  produce light reflecting bumps.
• MultiRead or MultiRead2 is an OSTA specification
  that states the CD-RW drive is backward
  compatible with CD-ROM and CD-R disks.

16
Magneto-Optical Drives

• MO (Magneto-Optical) Drive is a type of drive
  that uses a special technology for reading and
  writing multiple times to a compact disk. After
  the disk is heated by the laser to produce a
  bump, a magnet applies a charge to the surface.

17
Structure of a CD

• A single CD is 4.8 in diameter and can store
  about 780 MB of information. It is made out of
  polycarbonate material that has a single spiral
  made out of microscopic bumps. A thin layer of
  Aluminum is then applied over the bumps. A thin
  layer of acrylic covers the aluminum.
• Bumps are 0.5 micron wide and the spiral is
  separated by 1.6 microns. The spiral starts near
  the center and ends at the edge. The spiral is
  about 5 km long.
• On a DVD the bumps are 0.32 micron wide and the
  spiral is separated by 0.74 microns.

18
DVD-ROM

• DVD-ROM is a technology that produces disks with
  superior audio and video performance and
  increased storage capacity.
• In DVD drives, the MPEG-2 video must be
  converted, and the decoder is the way to convert
  the data.
• DirectX is a Microsoft DVD technology that
  integrates multimedia drivers, application code,
  and 3-D support for audio and video.
• Region Code is a setting on a DVD drive or disk
  that specifies a geographic region.

19
DVD-ROM
DVD Region Codes
Multimedia Table 5
20
Decoders

• Decoders are used to decompress the video and
  audio from a DVD.
• Hardware Decoder requires a PCI adapter and
  handles the decoding.
• Software Decoder is a type of DVD decoder that
  puts the burden on the CPU to decode and
  uncompress the MPEG-2 video data from the DVD.

21
Other DVD Technologies

• Types of DVD Technologies
• DVD-RAM uses a phase technology like CD-RW and
  allows data to be rewritten on a DVD-RAM disk.
• DVD-R uses WORM technology to use one or two
  sides of the disk.
• DVD-RW (DVD-ReWritable) uses 4.7GB disks that can
  be erased and rewritten to the disk.
• DVDRW (DVD Read and Write) is a drive that can
  be read from, written to, and holds 3GB.

22
Blu-ray Drives

• Blu-ray an optical disc technology that uses
  blue laser technology instead of the red laser
  technology currently used by CD/DVD drives.
• Blu-ray has a higher data transfer rate than DVDs
  and stores 27GB on a single side disc or 50GB on
  a dual-side disc.
• Blu-ray was developed for high-definition video
  and data storage.

23
CD/DVD Drive Interfaces and Connections

• Types of CD and DVD Drive Interfaces
• IDE most common
• SCSI
• USB
• FireWire

24
Preventive Maintenance for CD and DVD Drives

• If the laser lens gets dust, dirt, or moisture on
  it, the drive may report data or read errors.
• Laser Lens or Objective Lens is a special
  component of the CD-ROM drive that is responsible
  for reading information from the CD disk.

25
CD and DVD Drive Installation

• CD and DVD Drive Installation Steps
• Install any necessary mounting brackets on the
  drive.
• Set the appropriate master/slave, SCSI ID, or
  termination for the drive interface.
• Set any interrupt, I/O address, or DMA channel.
• Attach the appropriate cables to the drive.

26
CD and DVD Driver Installation

• Device Driver is a small piece of software that
  stays in RAM to allow communication with a piece
  of hardware.
• MSCDEX.EXE is a program provided with DOS and
  Windows 3.x that assigns a drive letter to the
  CD-ROM drive. It is included as a line in the
  AUTOEXEC.BAT file.
• Device Name is an eight-character name unique for
  each CD-ROM drive.
• CDFS (CD-ROM File System) is the Windows
  9x/NT/2000/XP 32-bit protected mode CD drive file
  system driver

27
Troubleshooting CD/DVD Drive Problems

• Troubleshooting CD/DVD Drive Problems
• Always use the latest drivers.
• Correct any interrupt, DMA channel, and I/O
  address conflicts.
• Verify that the CD or DVD is installed in the
  drive.
• Check power connections, cabling, and
  configuration settings.

28
Sound Cards

• Sound Card Features
• MIDI (Musical Instrument Digital Interface) is
  used to create synthesized music and found on a
  sound card.
• MP3 (MPEG-1 Audio Layer-3) is a sound format that
  compresses an audio file and has the extension of
  MP3.
• AAC (Advanced Audio Compression) is a sound file
  format that provides file compression.

29
Sound Cards
CD Drive with Sound Card
Multimedia Figure 6
30
Sound Cards
Sound Blaster Live Platinum 5.1 Sound Card Ports
Multimedia Figure 7
31
Sound Cards
PC Design Symbols
Multimedia Figure 8
32
Sound Card Theory of Operation

• The sound card must take the analog signal and
  convert it to a digital format to send the sound
  into the computer. To convert an analog waveform
  to 1s and 0s, samples of data are taken.
• Frequency Response is the number of samples taken
  by a sound card.
• It is recommended to purchase a PCI sound card
  that uses a minimum of 16 bits for sampling.

33
Sound Card Theory of Operation
Sound Wave
Multimedia Figure 9
34
Sound Card Theory of Operation
8-Bit Sampling
Multimedia Figure 10
35
Sound Card Theory of Operation
16-Bit Sampling
Multimedia Figure 11
36
Installing Sound Cards

• The steps to installing a sound card are similar
  to any other adapter. The onboard sound must be
  disabled before installing a new sound adapter.

37
Sound Cards Using Windows 9X/NT/2000/XP

• Audio Drivers
• WDM (Windows Driver Model) is a kernel mode
  process that handles audio management such as
  multiple streams of real-time audio.
• DS3D (DirectSound3D) is a Microsoft development
  included in DirectX3 that adds more 3D audio
  effect commands.
• A3D is an audio standard developed by Aureal
  Semiconductor that supports hardware acceleration
  and allows simulation of sounds in certain
  environments such as a tunnel or under water.
• EAX (Environmental Audio Extensions) is Creative
  Labs development that allows software and game
  developers to create a realistic audio
  environment such as muffling effects and audio
  directional effects.

38
Sound Cards Using Windows 9X/NT/2000/XP
NTs Multimedia Control Panel Tabs
Multimedia Table 9
39
Sound Cards Using Windows 9X/NT/2000/XP
2000s Sounds and Multimedia Control Panel Tabs
Multimedia Table 10
40
Speakers

• Speaker Features
• Power Rating is how loud the volume can go
  without distorting the sound and is expressed in
  watts-per-channel.
• Frequency Response Range is the range of sounds a
  speaker can reproduce.
• Shielding cancels out and keeps magnetic
  interference from devices.
• Listen to speakers with an audio CD and without
  headphones to hear the quality of the speakers.

41
Speakers

• The following is a list of extras for speakers
• An external volume control
• Headphone jacks
• Headphone and microphone pass-through connectors
• AC adapter
• Proper connectors to connect speakers to the
  sound card
• If the sound card is capable of 3D sound, a four
  or six speaker system is an enhancement.

42
Troubleshooting Sound Problems

• Troubleshooting Sound Problems
• Verify that the sound card is secured in a PCI or
  ISA slot and no cuts are present in the speaker
  wires.
• Verify installation of the correct sound drivers.
• Verify that there are not any resource conflicts.
• Check the speakers connection to the back of the
  computer.