AUDIO DEVICES, FORMATS AND

CODECS

STEFFI MEDINA AND KEVIN LOPES

Introduction

INDEX

Audio devices: MicrophonesLoud speakersSound card

Sound ports

headphones

Codecs:Loss codecsLossless codecs

Sound formats: wav

midi

aiff

cda

mp3

wmaaup

INTRODUCTION

The aim of this presentation is to

examine issues related to the sound (Audio

devices, formats and codes), which will serve

us later if we want to work with music or

sound.

AUDIO DEVICESMicrophone: A microphone is an example of a transducer. The sound information exists as patterns of air pressure; the microphone changes this information into patterns of electric current.

Loud Speaker: A loud speaker is an electroacoustic transducer that produces sound in response to an electrical audio signal input.

Sound card: It is an expansion card or integrated circuit that provides a computer with the ability to produce sounds that can be heard by the user either over speakers or headphones

Sound port: A sound port serves as an interface between the device and other peripheral devices.

Headphones are a hardware device that either plugs into your computer (line out) or your speakers and allow you to privately listen to audio without disturbing anyone else.

CODECS

A codec is a device or computer program capable of encoding or decoding a digital data stream or signal. Depending on its compresion quality we can differentiate two type of codecs lossy codecs and lossless codecs: The loss codecs reduce quality by some amount in order to achieve compression

The lossless codecs are used for archiving data in a compressed form while retaining all of the information present in the original stream.

Lossy codecs:

Lossless codecs:

SOUND FORMATSSound format also know as audio file format is a flie format for storing digital audio data on a computer system. Among the sound formats, we can differentiate three major groups of audio file format:Uncompressed audio formats:

Formats with lossless compression:

Formats with lossy compression:

MIDI: (Short for Musical Instrument Digital Interface) is a technical standard that describes a protocol, digital interface and connectors.

•WAV•AIFF•AUP

•WMA(Lossless)

•MP3•WMA(Lossy)

Webgraphy•Codec http://en.wikipedia.org . Unknown Author. 25, March 2014•Designing presentations that don't suck! http://designshack.net. Unknow author. 25, March 2014.•Stock.Xchng http://sxc.hu/. Unknown author. 25, March 2014•Audio file format http://en.wikipedia.org. Unknown author. 25, MaRCH 2014.•Microphones http://artsites.ucsc.edu . Made by Peter Elsea. 25, March 2014.•Loudspeaker http://en.wikipedia.org/wiki/Loudspeaker. Unknown author. 25, March 2014.•Sound card http://www.computerhope.com. Unknown author. 25, March 2014•Sound port http://en.wikipedia.org. Unknown author. 25, Marcg 2014.•Headphone http://www.computerhope.com. Unknown author. 25, March 2014

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