AUDIO OUTPUT DEVICES.

AUDIO OUTPUT DEVICES.

Audio output devices are the components of a computer that produce music, Speech or other sounds.  Two commonly used audio devices are speakers and headsets.  Most personal computers have a small internal speaker that outputs only low quality sound.

Users who need higher quality sound output may use a pair of stereo speakers and subwoofers connected to ports on the sound card.

4. DATA PROJECTOR.

A data projector takes the image that displays on a computer screen and projects it onto a larger screen so that people can see the image clearly.

An LCD projector which uses liquid crystal display technology  can produce lower quality images only.

A DLP (Digital Light Processing) projector, which uses tiny mirrors to reflect light can produce much better images even in a well-lit room.

Other output devices include:

➢    Facsimile (fax) machine

➢    Multifunction machine

➢    Terminal

N.B

(a)   A PORT: This an outlet for data to the computer peripheral e.g printer, monitor, modem, flsh disks e.t.c  Most computers today have three ports.  They are;

(i) Serial port (Com₁, Com₂). A serial port transmits data one bit(s) at a time and usually connects devices that do not require fast data transmission.

(ii) Parallel ports (LPT₁  LPT₂) :  Used by many printers and send out 8 bits or 1 byte at time.  The newer types of parallel ports are the enhanced parallel port (EPP) and the Extended capabilities port (ECP)

(iii) USB port (Universal Serial Bus) can theoretically connect up to 127 different peripheral devices daisy chained to one general purpose port.  USB also supports hot plugging as well as plug and play.

Devices connect to the system unit using USB port include keyboard, mouse, scanner, disk drive and digital camera.  The newer USB 2.0 can run 40 times faster than the earlier version.

(b)   NETWORK CONNECTORS:  These act as an interface in networking (linking) computers, so that one can access data or information on another computer on the network card.

(c)    EXPANSION SLOTS AND BOARDS

Expansion slots are places where new boards or cards can be added to customize the computer.

Boards/cards are control devices to add special functions or more power to the computer e.g Tv card, sound card e.t.c …

Among the types of expansion cards are expanded , memory, display adapter, graphics adapter cards. E.t.c …

(d)   BUS: This is an electronic channel that allows the various devices inside and attached to the system unit to communicate   with each other.

(e)    A port is also the interface or a point of attachment to the system unit.  Other types of ports include;

-       SCSI port

-       1394 port

-       MIDI port

-       Ir DA port

-       Video Adapter game

-       Game ports

A MIDI (Musical Instrument digital interface) port is designed to connect the system unit to a musical instrument such as the electronic keyboard.  MIDI is a standard of the music industry.

An IrDA (Infrared Data Association) port allows wireless devices to transmit data via infrared light.