PC sound

1
PC sound

• Motherboard speaker
• Beeps and clicks
• Creative Labs SoundBlaster
• Music, plus beeps and clicks
• Digitizing input music
• SoundBlaster Pro considered the base standard

2
Sound card components

• Digital signal processor (DSP)-Sort of like a
  CPU for sound processing functions.
• Analog to digital converter (ADC)-Converts
  analog signal (like sound waves) to digital
  signal.
• Digital to analog converter (DAC)-converts
  digital signal to analog signal producing the
  signal needed by the speakers or other analog
  audio devices.
• Jacks and ports for microphones, speakers, line
  input or line output devices, game adapters and
  sometimes MIDI (musical instrument devices
  interface) devices.

3
A sound card
4
Sound card connectors
Speaker
Line in
Microphone
5
Speakers
6
Modems

• Modems are devices that enable you to connect
  your computer to another computer through a phone
  line. The modem in the sending computer must
  convert the digital signals within the computer
  to analog signals that are compatible with the
  phone system. The receiving modem must convert
  the analog signals to digital signals.
• Modulation is the process where by the modem
  converts digital signal into analog signal.
• Demodulation a process by which the modem
  electronically subtracts the carrier analog wave
  revealing the digital signal it carries.
• A modem gets its name from this process. It
  modulates and demodulates, hence its called
  MODEM.
• Forms Modems can be external components
  connected through the serial port.
• They can be built in the motherboard
• Implemented on an adapter card that you insert
  into your PCs expansion bus or implemented on a
  card that you insert into a riser slot.

7
Riser cards

• AMR (Audio Modem Riser)
• Supports Audio (sound) and modem cards
• CNR (Communication Modem Riser)
• Supports Audio cards, Communication (specialized
  modems) and network cards
• ACR (Advanced Communications Riser)
• Modem, sound, and network cards
• Proprietary design to ASUS
• Simplified expansion card reduces price

8
Softmodems

• Implements features in software rather than
  hardware
• WinModem Windows-based
• Advantages
• Less expensive
• Easily upgradeable
• Detraction
• Specific to operating system (and perhaps
  version)
• Slower than hardware-based modems
• Use CPU power

9
System resources
10
RJ-11 Connectors (six pins-analog2pins,
digital4pins)
Do not plug your modem to a digital phone line it
would burn your modem.
11
Modem connections
12
AT commands

• ATDT number
• ATDP number
• ATH
• ATA
• , (comma)
• 70
• ATZ0
• A/
• ATF

13
HyperTerminal

• Send AT commands to your modem
• Configure echo characters
• Start, All Programs, Accessories, Communications,
  HyperTerminal

14
Asynchronous and synchronous

• Mark beginning and end of data
• Asynchronous
• No clock
• Relies solely on a pattern of bits
• Synchronous
• Timer clock
• Sends bit pattern once
• Relies on timing

15
Speed standards
16
MNP classes
17
Drive controller symptoms

• IDE drive not recognized
• SCSI drive not recognized
• System with IDE drive wont boot, with or without
  BIOS error message
• System with SCSI drive wont boot, with or
  without BIOS error message
• IDE drive inaccessible or performs badly
• Full size of drive not available

18
Video card symptoms

• No video at all
• Video scrolls, flips, wavers, is too large, lines
  double up, and so forth
• Video flickers
• Video is blurry
• Image artifacts are displayed across the screen
• System freezes during a video change, such as an
  image scrolling or changing

19
Sound card symptoms

• No sound
• Sound is very low
• Sound is distorted
• No audio captured
• No audio from CD

20
Internal modem symptoms

• Modem picks up line and dials, but doesnt
  connect
• Modem reports no dial tone detected
• Connection drops frequently
• Modem connects, but only at low speeds
• Modem doesnt work at all
• Configuration related error messages

21
Unit summary

• Defined the common drive interfaces, and
  installed a drive controller
• Described video adapters and standards, and
  installed a video adapter
• Defined sound cards, and installed a sound card
• Described modem standards, and installed a modem
• Resolved expansion card-related problems