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Computers Sound System 03/21/2012 Manish Yakami
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Page 1: Sound system

Manish Yakami

Computers

Sound System

03/21/2012

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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

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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

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Various types of Sound System

Microphones Headphones Speakers

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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,.

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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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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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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

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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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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.

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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.

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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.

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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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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.

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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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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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Thank You

03/21/2012