How do MP3 Players Work?
Posted on January 1st, 2009 by monsterguide
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Portable music players have been around for over 50 years. What started out as large transistor radios that only played AM turned into cassette tape walkmans, portable CD players and eventually MP3 players. Over these last fifty or so years, remarkable improvements have been made, giving the average consumer quite possibly the ultimate personal and portable music and media player.
What is an MP3 Player?
An MP3 player is a remarkable device. Generally speaking, an MP3 player is characterized as a portable, personal music player that plays music in the form of MP3 files. Here are some key aspects of most MP3 players:
Personalized Music
The overwhelming amount of mp3 players are built for personal listening, however, mp3 players can be a feature on DVD players, CD players, car stereos, boom boxes, etc. MP3 players are similar in style to Sony Walkman products, in the fact that they include headphones to allow a person to listen to his or her private collection of music while traveling.
Extremely Portable
One of the biggest features of MP3 players is that they are extremely portable. While some might have thought the Sony Walkman was portable, the MP3 player uses digital media, meaning that it doesn’t have to be a certain size to play a certain media (e.g. cassette tapes). This means that not only are MP3 players extremely small and lightweight, but all music files are saved on the player, meaning that you don’t have to carry around CDs or cassette tapes of your favorite music. You can even hook up your MP3 player to your car stereo. Many reasons why MP3 players are so portable is due to the type of files that they play and the technology that stores these files, more information about these technological aspects can be found in the next paragraph.
MP3 Files
MP3 players are so small, lightweight and portable due to the file format that they are designed to predominantly play. The MP3 file format became very popular during the late 1990s, allowing people to download music from servers from the internet and onto their computers. MP3 files are digital files similar to files that are located on other types of digital media such as compact discs (CD’s), however, unlike CD’s, MP3 files are compressed to be made smaller, making it easier to send over the internet, download onto a computer and save onto a hard drive or mp3 player. MP3 stands for MPEG Audio Layer III, it was one of many methods of compressing digital files, but it caught on for a few specific reasons.
- MP3 was able to reproduce CD quality music in a much smaller compressed format. For instance, for a song that requires 50 megabytes of data on a CD, this song only requires about 5 megabytes of data in MP3 form.
- MP3 players for computer desktops were available for free over the internet, making it extremely easy to rip CD’s into the new format and play them on your MP3 player located on your desktop.
- MP3s were the chosen media file type to be swapped by large servers and the first peer2 peer sites such as Napster in the late 1990s. Many users got their first taste of MP3s from peer2peer networks, which is why many still prefer to keep all their music in this format.
- Technology companies can build and sell MP3 capable players without having to pay a high licensing fee or development costs. This is one of the major reasons that MP3 players are extremely popular consumer electronic items in today’s market.
It should be noted that many consumer MP3 players not only play MP3 files, but other types of files as well. MP3 has turned into almost a generic term to mean various types of compressed digital music files. Other files that are commonly supported on many consumer MP3 players include: WMA (Windows Media Audio), WAV (Waveform Audio – CD’s), AAC (Advanced Audio Coding – Apple’s digital audio file format) and OGG Vorbis (a free, unpatented, open source file format)
The Technology behind the MP3 Player
While most previous forms of music players required not only separate media that was inserted into the music player, all of these music players had plenty of working parts that in many cases failed after extensive use. For instance, walkmans had a motor, capstan and other moving parts necessary to move magnetic tape and read it. Unlike these previous music players, most mp3 players have no moving parts (usually referred to as solid state technology) which inevitably mean that they are extremely reliable.
MP3 players are simply digital data storage devices that can store digital files (MP3s), read them, uncompress them and send the audio out through headphones. MP3 players, although extremely small and lightweight (usually only a couple of ounces or less), are made from a variety of parts that all work together to create music.
The Basic Components of an MP3 player include:
Power Supply: The power supply for practically all personal MP3 players comes in the form of a battery. Batteries can be standard AAA or AA or they can be proprietary batteries that are designed to fit specifically in a particular unit. Most proprietary batteries are rechargeable batteries that either need to be hooked up to a charger or USB port to be charged.
Data Port: A data port is the method in which digital files can be transferred from a computer or other source onto the MP3 player. Usually the data port is either a USB adapter cable or uses a male USB adapter to directly plug into any USB port. Transferring music via the data port is usually easy and works with a variety of computer operating systems. Many new MP3 players no longer require a data port and can receive digital files via wireless communication including wifi and Bluetooth.
Memory: Perhaps the biggest selling point of many MP3 players is the amount of memory it stores. Just like a computer hard drive holds digital files, so does an MP3 player. MP3 players come in a variety of types of memory including: Flash Memory, miniature hard drives, and compact flash cards.
Flash memory is solid state memory that is extremely thin. It looks like a small wafer, but the capacity for its storage has grown from about 32 megabytes in the late 1990s that held about 30 minutes of music to more than 8 gigabytes that can store about 4,000 songs.
Miniature hard drives are another popular form of storage. Unlike flash memory, they have moving parts and are generally not as reliable for storing data as flash, however, their storage capacities are much larger than flash memory. For instance, several MP3 players on the market include miniature hard drives that can store over 160 gigabytes of music. This means that you can store about 80,000 songs – more than enough storage for the average music listener. MP3 players with miniature hard drives are usually targeted for people looking to play more than just music (e.g. video files). It should be noted that since miniature hard drives are larger than flash memory, the MP3 players that house them are generally larger in size and weigh more as well.
Compact flash cards are another popular method of memory in many MP3 players. Similar to flash memory, compact flash cards can be inserted and swapped. They are small portable media that can be carried around and inserted into an MP3 player. They are solid state and usually come in the same amount of storage capacities as flash memory.
Microprocessor: The microprocessor in an MP3 player is similar to that in a computer – it is considered the brain of the player. It handles the user controls and also the display. It also controls the DSP chip (digital signal processor) as well.
DSP (Digital Signal Processor): The DSP is a chip that converts digital zeros and ones into music. It decodes MP3 files and other forms of file types on the player and turns these digital signals into audio, which is sent to an amplifier and then to the audio port which is usually your headphone jack.
Playback Controls: Playback controls give the user easy access to the files on the MP3 player. While some playback controls are small rubber like buttons, others are more advanced, such as the iPod’s touch sensitive controls.
Display Screen: Since MP3 players usually hold hundreds or even thousands of files, a user must be able to interact with the player to access the desired music. In addition, MP3 players include the capability to play videos, view digital photos and even view software accessories such as calendars or play video games. The display screen which is usually backlit and can include either an LED (light emitting diode) or LCD (liquid crystal display) screen can be found on practically every kind of MP3 player sold today.
Using an MP3 Player
One of the main selling points of MP3 players is that they are extremely convenient to use and feature rich. If you are planning on purchasing an MP3 player, here is how one would generally work.
Most MP3 players connect to a computer in order to transfer music in the form of digital files from your computer’s hard drive to your MP3s player. Some MP3 players, such as Apple’s iPod come with their own software, however many do not require software at all, they just need to connect to a Windows operating system that includes a USB port and driver. It should be noted that while some MP3 players include a male attachment to connect directly with a USB port, others include a USB cable that connects the MP3 player to the computer. Once your MP3 player is connected to the computer you can drag and drop digital music files easily and quickly. It takes only a few seconds to transfer one song from your computer to your MP3 player and vice versa.
Obviously, before you transfer MP3 files from your computer to your MP3 player, you will need to have them stored on your computer. You can collect MP3 files in a variety of ways, including buying them and downloading them from many online stores such as Apple iTunes or Amazon.com, or ripping compact discs, changing the files from WAV to MP3. All those CDs you own can easily be converted into MP3 files with simple, usually free software.
Once MP3 files are on your player, now the fun definitely begins. Unlike walkmans or portable CD players, you can have literally thousands of songs at your finger tips. In order to get the most use out of your music, you will need to organize your music for easy access. Most MP3 players come with an easy-to-use interface which allows you to search through your music collection, organize your music by genres, bands, etc or create playlists, which are lists of songs that are stored in memory. So, although you may have thousands of songs on your MP3 player, enjoying your music is almost instantaneous and extremely easy.
Since most MP3 players use rechargeable batteries, recharging your MP3 player for use is very simple. Two main ways to charge your MP3 player is to use a charger that draws power from the mains or connect your player to a USB port to charge. Most MP3 players can play for about 6 to 20 hours per charge and recharging your battery takes just a few hours.
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