Computers Sound System 03/21/2012 Manish Yakami
Manish Yakami
Computers
Sound System
03/21/2012
Manish Yakami
Computer Sound system
Sound system refers to both I/O devices
System like Headphones, Microphones, Speakers
Sound System is controlled through Sound Cards
Computer Sound Systems Depend On Quality Sound Cards
03/21/2012
Manish Yakami
Sound cards
A sound card (also known as an audio card) is an internal Computer Expansion Card that facilitates the input and output of Audio Signals to and from a computer under control of computer programs
Sound cards usually feature a Digital to Analog Converter (DAC), which converts recorded or generated digital data into an analog format.03/21/2012
Manish Yakami03/21/2012
Manish Yakami
Various types of Sound System
Microphones Headphones Speakers
03/21/2012
Manish Yakami
Microphones
is an acoustic-to-electric transducer or sensor that converts sound into an electrical signal.
Microphones are used in many applications in computers for recording voice, speech recognition,.
03/21/2012
Manish Yakami
Variety of Microphones
Condenser microphone Dynamic microphone Ribbon microphone Carbon microphone Piezoelectric microphone Fiber optic microphone Laser microphone Liquid microphone MEMS microphone
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Manish Yakami03/21/2012
Manish Yakami
Speakers
is also an electroacoustic transducer that produces sound in response to an electrical audio signal input.
Speakers come in all shapes and sizes, enabling you to listen to music and enjoy a film on your computer.
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Manish Yakami
How do speakers work?
Inside a speaker:1. Cone2. Electromagnet (coil)3. Permanent magnet
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How do speakers work? (cont)
contain an electromagnet: a metal coil which creates a magnetic field when an electric current flows through it.
coil behaves much like a normal (permanent) magnet, with one particularly handy property: reversing the direction of the current in the coil flips the poles of the magnet.03/21/2012
Manish Yakami
How do speakers work? (cont) an electromagnet is placed in front of a
permanent magnet. The permanent magnet is fixed firmly into position whereas the electromagnet is mobile.
As pulses of electricity pass through the coil of the electromagnet, the direction of its magnetic field is rapidly changed. This means that it is in turn attracted to and repelled from the permanent magnet, vibrating back and forth
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Manish Yakami
How do speakers work? (cont) The electromagnet is attached to a cone
made of a flexible material such as paper or plastic which amplifies these vibrations, pumping sound waves into the surrounding air and towards your ears.
The frequency of the vibrations governs the pitch of the sound produced, and their amplitude affects the volume – turn your stereo up high enough and you might even be able to see the diaphragm covering the cone move.
03/21/2012
Manish Yakami
How do speakers work? (cont)
To reproduce all the different frequencies of sound in a piece of music faithfully, top quality speakers typically use different sized cones dedicated to high, medium and low frequencies.
03/21/2012
Manish Yakami
The History of Speakers
German, Ernst Siemens patented the first loudspeaker on Dec. 14, 1877.
Sir Oliver Lodge received the second patent for a loudspeaker on April 27, 1898. This was all before music was electrified.
03/21/2012
Manish Yakami
The History of Speakers(cont)
In 1924, two General Electric researchers, Chester W. Rice and Edward Washburn Kellogg patented the modern, moving coil, direct radiator, loudspeaker, which become the prominent design for all loudspeakers.
In 1958, the first box-enclosed loudspeakers were invented by the Cabesse, a French company.03/21/2012
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Manish Yakami
Headphones
a pair of small loudspeakers which are designed to be held in place close to a user's ears.
Headphones have wires which allow them to be connected to a signal source such as an audio amplifier, radio, CD player, or portable media player.
03/21/2012
Manish Yakami
are also known as stereo phones . The in-ear versions are known as
earphones or ear buds In the telecommunication, the term
headset is used to describe a combination of headphone and microphone.
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Manish Yakami
Applications
CD or DVD players. home theater. personal computers. portable devices (e.g. digital audio
Player/mp3 Player, mobile phone, etc.)
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Manish Yakami03/21/2012
Manish Yakami
Thank You
03/21/2012