How does an Mp3 player works?

It’s simply called ‘technology’, for a better idea, read on.

Mp3 PlayerConversion to Digital Music

Digital music is nothing but data, or music, stored as digits. Similar to any other computer data, music files like MP3 contain data in the form of a series of 0s and 1s. There are four phases related with digital music: analog-to-digital conversion, digital-to-analog conversion, storage and transmission. To convert an analog signal to a digital signal an audio-to-digital converter or an ADC is used. The ADC has a sampling rate that determines how close the digital signal is to the analog signal. Higher the sampling rate, better the quality and more the digital data in the form of 0s and 1s.

Audio Compression

Space is a major concern when it comes to saving digital music. One song could occupy anything from 4MB to 12MB of disc space. Hence, file compression technology has great application in music. In order to compress data algorithms or programs called codecs are used. Codec stands for compression-decompression. As the name implies, these algorithms encode signals for storage, transmission or encryption and decode them for viewing or editing. The quality of sound depends on the quality of the codec algorithm and the bit rate of encoding.

Playback

After the analog data is converted to digital data it is again converted to audio signals when a digital file is accessed. The first step of the process is reversed here. To convert the digital data, the 0s and 1s, back to analog signal, a digital-to-analog converter or a DAC is used. The software on the chip inside your MP3 player applies the codec algorithm, decodes the files, and sends the digital data to the DAC. The audio signals are then played on the output device. In addition to the quality of the audio compression algorithm, the final sound quality depends on the DAC chip used in the player. Other factors like the quality of headphones or speakers also have an effect on the sound quality.

File formats

A file format is a particular way in which data is encoded for storage in a computer file. The most widely accepted file format is MP3 but a lot of MP3 players now support file formats like AAC, WMA, OGG etc as well.