Computer-delivered electronic system that allows the user to control, combine, and manipulate different types of media, such as text, audio, video, graphic and animation. The most common multimedia machine consists of a personal computer with a sound card, modem, digital speaker unit, and CD-ROM. Long time as the future revolution in computing, multimedia applications were, until the mid-90s, uncommon due to the expensive hardware required. With increases in performance and decreases in price, however, multimedia is now commonplace. Nearly all PCs are capable of displaying video, though the resolution available depends on the power of the computer's video adapter and CPU. One of the multimedia elements is audio. Audio include music, speech ,or any other sound. Audio and digital music are different from other multimedia elements. This is because the audio and digital music is not related to visual .Audio cannot be seen but can only be heard with the ears only. Computer will result in vibration of air through the speakers or sound box, while our ears detect vibrations in the air. As the sound wave moves away from the vibrating object, the individual molecules do not advance with the wave, they vibrate at what is termed their average resting place until their motion still or they are set in motion are the component that make up a sound wave, frequency, amplitude, velocity, wavelenght, and phrase. Before the continuous wave analog audio can be stored in a computer, the computer need to measure the amplitude of the waves into a series of fixed-time intervals and store these readings into storage. In this process, analog information into digital information exchanged and information data continuous becomes discrete data. To produce audio and digital music, you need Analog-Digital Converter. ADC takes analog audio part of the wave-time at a fixed interval. The interval is called the sampling rate. During each sampling interval, the ADC measuring the amplitude (size) and record analog audio wave numbers in a sequence. If in ordinary language, the am At the end of the process, a stream of numbers describes the size of the audio wave anmplitud stored in storage media such as hard disk drives. Amplitude is the intensity of the sound. The harder a sound, the higher the value of the amplitude.

Digital music store requires a large space, which is about 10 MB for every minute of stereo sound. However, not all signals to be stored in uncompressed digital files. Codec (compressor) is the algorithm used to compress the audio file size without significant Producing low-quality sound. Without the codec algorithm, you will not be able to download music, send music by email or listen to music in the flow (stream) over the Internet. Prevailing popular codec in use is WAV, MP3, WMA, Ogg Virbis, Real Audio, MIDI and other. Some of the application on the on the Web use streaming audio. Many radio and television station use streaming audio to broadcast music, interviews, talk shows and other segments. To listen to an audio file on your computer, you need special software called player. Popular players include iTunes, Real Player and Window Media Player. You can download the players free from the Web.

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