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Digital Audio Formats : MP3
 
MP3 Beginner's Guide
  
What is MP3

MP3 is a file format standard for stored digital audio files. MP3 files are stored digitally in such a way that, despite a relatively small file size, the sound quality is excellent.  Compared to traditional formats, MP3's have a compression ratio of 12:1.  However, because of this intense compression, to listen to an MP3 on a computer generally requires a Pentium class personal computer processor and at least 32 MB of system memory.  

You can identify MP3 files on a Personal Computer by the "mp3" file extension.  They are automatically recognized by the Windows 98 and up (Win 2000, Win XP) operating system.  The compression ratio and high sound quality of a MP3 make it ideal for the Internet medium.  On the Internet, millions of people download and trade MP3's of their favorite artist's songs and albums everyday.

History of MP3

MP3 is the shortened name for MPEG-1 Layer III (or MPEG Audio Layer III) and is an audio subset of the MPEG industry standard developed by ISO (Industry Standards Organization) and became an official standard in 1992 as part of the MPEG-1 standard.

Fraunhofer Gesellschaft (FhG), a German company, was the company originally involved in MP3 development and holds key patents regarding the technology.

MPEG-1 Layer III is an audio only compression component and is a direct descendant from MPEG-1 which is low-bandwidth video compression, the type that is used over the internet and MPEG-2 which is a high-bandwidth audio and video compression which is the standard for DVD technology.

Development of MP3 started back in 1987 in Germany at the Fraunhofer Institut Integrierte Schaltungen and its given name was the EUREKA project EU147, Digital Audio Broadcasting (DAB). With the involvement of Professor Dieter Seitzer of the University of Erlangen, an algorithm was developed and eventually became known as the ISO-MPEG Audio Layer-3 standard.

January 1988 saw MPEG itself established, its full title Moving Picture Experts Group, not an organization in itself, but a subcommittee of the ISO/IEC (International Standards Organization/International Electrotechnical Commission).

Fraunhofer received a patent in April 1989 for MP3 in Germany and in 1992 Fraunhofer’s algorithm was integrated in MPEG-1 for which the specification was published in 1993.

MPEG-2 and its specification was published in 1995.

January 26th, 1995 saw Fraunhofer apply for the patent of MP3 in the U.S.A. and it was granted on November 26th, 1996.

September 1998 Fraunhofer contacted independent developers of MP3 encoders (rippers) and decoders (players) that were based on the ISO source code. Fraunhofer had patent protection on the algorithm they were using and developers who wanted to develop their software applications further would have to apply to Fraunhofer for license.

Sub Pop, an independent record label, began in February 1999 to distribute selected music tracks in the MP3 format.

Since the beginning of 1999 the popularity of MP3 increased to such an extent that major manufacturers flooded the market with portable MP3 players, the next step on from the Walkman and Portable CD and Mini Disc players. Music sites popped up everywhere on the internet offering free legal MP3 music and also music to purchase.

Is MP3 legal?

Yes, MP3 is simply a file format and is very legal.  The act of selling, trading and listening to MP3's falls under normal U.S. copyright law.  It is legal to trade a MP3 file if the song's copyright holder has granted permission to download and play the song.  For example, all MP3.com artists have agreed to distribute their music to visitors of the website.  It is illegal to sell, trade or listen to MP3's if the artist hasn't given express, written permission to do so.

Truly legal MP3's are rare and often the songs are from lesser known artists.  Because of these difficulties, most MP3 trading on the Internet is technically "illegal".  Reality dictates that downloading and playing MP3's is not a serious offense that warrants any sort of prosecution or investigation.  In many ways, MP3 trading is likened to the copying of movies or television programs.  Many search engines and software utilities have been forged to help MP3 users trade song files.  These search engines and utilities are often backed by large companies, who don't seem to be afraid of the medium's controversial nature. 

In general, if you simply listen to songs for personal use, there is no real problem.  If you start using MP3 to make bootleg CD's, or begin selling them in bulk, you will start to find trouble.

How do I listen to MP3's?

There are many different ways of listening to MP3's.  In fact, the process can be as simple or as sophisticated as the user desires.  

In the most simple case, no special software is needed to play or download MP3's.  Any web browser is able to download a MP3 file and the Windows Media Player, which comes as part of the Windows operating system on Windows PCs, is capable of playing them.  However, most MP3 users do not find these basic tools adequate. 

Most MP3 users prefer a customized MP3 player program such as WinAMP and download utilities such as GoZilla, Getright or the new Napster.  These programs make the experience of listening to your MP3's a little more pleasant and prevent headaches often associated with sorting and playing more than one MP3 file on your computer.  

MP3 Players
In general, MP3 players are practically identical to other multimedia players such as the Real Audio player or Apple's QuickTime.  Files can be played by either double clicking on files themselves or by launching the player and selecting a given song as if it were a word processing document or any other file on your computer.

Portable MP3 Players
Alternatively, you can take your MP3 files with you, just about anywhere.  Portable MP3 players are now more popular than ever.  You can buy these digital players at most major electronic stores and countless places online.  To learn more about these players, read Portable MP3 Players or see a detailed example of one here. The Apple iPod is one of the most popular players.

How do I find MP3's?
MP3's can be found all over the web.  As mentioned above, MP3's can always be found at large MP3 portal sites such as MP3.com or MP3now.com.  However, such sites offer a relatively small selection and only account for music that has been deemed "legal".

Several search engines have been developed specifically for MP3's. Lycos MP3 Search, Scour and Palavista are a few of these useful search engines.  Additionally, software utilities like Napster allow MP3 users to search for, and trade, MP3's through a client - not unlike AOL's Instant Messenger.  As the MP3 phenomenon grows, more efficient searching and downloading tools will be available for MP3 users.

For a list of the best MP3 sites on the Internet visit MP3 sites section.

How do I make my own MP3's?
In some sense, it is impossible to "make" MP3's.  Unlike MIDI files, which are lists of instructions given to computer based instruments, the MP3 format is not a tool for the creation of music.  In other words, a musician cannot create music in MP3 form.  However, existing formats can be converted to the MP3 format for better compression without a reduction in sound quality.

Music files are quite bulky and CD tracks, in their original form, are far to large to be transported over the Internet.  The process of converting a CD track to a MP3 is relatively simple and can be accomplished with many software packages such as Audio Catalyst, MusicMatch Jukebox and others.  These programs come in quite handy, as an entire CD can be stored on a hard drive at a fraction of the space or on a Zip disk.

What is a portable MP3 Player?

MP3 players are the hottest gadgets on the market and for good reason: they allow you to hear all that great music that's available on the Web and take it with you everywhere you go. Weighing in at only a few ounces, these battery-powered devices are simple to use. Most portable MP3 players come bundled with software including a ripper that allows you to convert songs from your CD collection into MP3 files on your computer's hard drive and a file manager that lets you organize, store and transfer MP3s from your PC onto the portable player. First, just download some MP3 files from the Web (free sites or from an online store) to your computer or rip some tracks off a CD. Once you're finished, using the portable player's supplied software program (usually on the supplied CD) to manage your music files, transfer the files onto your portable MP3 player via your PC's USB port. (You would connect the portable player to your computer by way of the supplied USB cable) Detach the cable, and you're ready to hit the road. (You may need some time to get familiar with the navigation and operation of your players music manager software.)

Portable MP3 players are just a fraction of the size and weight of a personal CD player, and since the music files are stored in solid-state flash memory, your music won't skip. And for music lovers, MP3 is a dream come true. Tracks by thousands upon thousands of artists, from the established to the obscure, are available for download on the Internet. Some outlets charge a small fee for downloads, but a lot of independent music is available for free. 

Wal-Mart stores have joined the online market, offering music downloads for 88 cents per song and using the Microsoft WMA format. Apple has their own online music store called iTunes for downloads to your Apple iPod player. You can store, organize and listen to music right from your computer and download it easily to a player that you can take on the road, which means you may never have to go to a record store again. And with the music industry increasingly looking to the Internet as a venue for commercial music distribution, now's the ideal time to get ahead of the game and start growing your MP3 music collection. 

Beware of current incompatibilities as the market wars continue to determine what formats and copy protection schemes will eventually win out. As in the past, Microsoft and Apple have different approaches, meaning you need to do your research to determine your final music playing solutions. Some players may not be able to decode all formats.

Consider these important Portable MP3 player features:

Interface: Portable MP3 players generally interface with a computer in one of three ways: parallel, serial and USB. Parallel and serial interfaces are standard ways to connect an MP3 player to a computer. USB (Universal Serial Bus) transports information from your computer to your MP3 player through one of the fastest cable connections available today.
Internal Memory: The amount of internal memory (also called onboard memory) that comes standard on the player varies, but the average is 64 or 128 or 256MB. Most players have additional memory slots so removable memory cards can be added. So, how much memory is enough? 32 MB will store approximately six songs, so in general, the more memory that comes standard, the better.
Expandable Memory: Most players allow you to add extra memory and have maximum capacities of 32 MB, 64 MB and over 128 MB.

Portable mp3 Player: Storage Size Matters

A little background on mp3 player technology may help you figure out what you need - MP3 players have four components, a decoder chip, a storage system, a display, and a control system. The decoder chip and control systems are all made from very compact parts that are very cheap to make - only a few dollars. So it is the storage system that represents the bulk of the cost, and determines the size of the player and its main features.

Let's look at the different storage technologies used in mp3 players:

Storage Media Approx. Number of Songs Size Approx. Cost Example
Integrated Flash 24 to 36 key ring - matchbox $30-150 RCA Kazoo
Flash Module 24 to 36 matchbox-shirt pocket $80-200 Nomad IIc
CD, mini CD 200 per CD portable CD player $100-200 Iriver Slimx
Disk drive 5,000 to 
15,000
shirt pocket - CD player $200-$500 Nomad Jukebox, Zen, Apple iPod

If you buy a player that stores about a dozen songs, the display size and features are not very important. If you opt for a player that can store thousands of songs, the display size becomes very important as you will spend more time navigating to find the song you want. Although other companies are catching up, Apple's iPod is the clear winner in the display size, quality and navigational areas. The iPod is not just for the Macintosh. It works well with Windows computers too.

Convenience of mp3 Players

From the table you can easily see that the disk drive or "jukebox" players are the most convenient for quick access to many songs. With blank CD's being so cheap the MP3 CD players offer the cheapest access to many tracks but at some inconvenience: you have to burn, carry around and change the CD's.

mp3 Player Reliability

The most reliable players are the ones with Flash storage because they use no moving parts for storage that could wear out. If you already use flash cards, in a digital camera for example, you might consider picking a player that uses the same kind of card. USB flash card readers are readily available for all 6 formats of flash card so it is easy to put your songs on the cards from any modern PC.

mp3 Player Software and Connectivity

Another important factor to consider is which kind of computer you have and whether the software bundled with the player will work well on your system. All the players work with Windows PC's and most use the USB 1.1 connection. The recent jukebox players use the new faster, USB 2.0. 

Players from Apple and Creative Labs have Firewire (IEEE1394) connections. If you plan to update your player regularly with many mp3's you should definitely choose a USB2.0 or Firewire connected player. Creative Labs Nomad and Apple's iPod work well for Macintosh users, but don't forget that the iPod is available for Windows users to.

Unfortunately the Nomad Zen does not come with Apple Macintosh support.

Audio Formats

All the players do a good job on mp3 format files. Microsoft has another audio format, WMA which is more space efficient and quite popular but not all the players support it. Apple's proprietary format used in their popular music download store works well on the iPod but is not available on other players yet.

General Recommendations

If you are just exploring the world of mp3 players or buying for a young person, you should probably go for one of the cheaper Flash memory players such as the Nomad IIc.

If you want the state of the art with no compromise on capacity or convenience go for a jukebox like the new Creative Labs Zen or the Apple iPod.

If you are already weighed down with portable gadgets consider a device that integrates mp3 player and other functionality like the Fuji Finepix digital camera or the ultra-slim Casio Exilim digital camera and mp3 player. New and already very popular devices from IRiver include an FM tuner and the ability to do voice recording, direct recording from the radio and high quality recording from an external source.

Musicians will find the special speed change feature of the Nomad Jukebox and Zen products very useful for learning musical phrases. These players can slow down the audio as much as 50% without changing the pitch of the recording.

Where to find mp3 Downloads and mp3 Files

All the players come with software to "rip" audio tracks from your CD's and put them into mp3 form. One of the best download sources you can try for free is EMusic. They have a large source of big name artists and it is very easy to download whole albums.

 
What are some of the primary features to look at when comparing MP3 players?
The features which are most commonly used to compare MP3 players are listed below. While these are not the only features which can be considered, they cover the basic considerations of usability. Platform, software, connection type, memory and power source are most commonly used as they directly affect the connection and after-sale cost of using the MP3 player.
Platform: Refers to the type of computer and operating system required to connect to and transfer files to and from the MP3 player. The two primary computer types are PC and Apple®. The two primary operating systems are Microsoft® Windows® and Apple's Macintosh® OS.
An MP3 player which can be connected to a computer will support at least one or possibly both of these platforms. Occasionally, the Macintosh-compatible software will be made available for download rather than being packaged on the CD. Generally, you would need to contact the manufacturer of the software to determine if they support a particular version of your operating system (such as Windows XP or Macintosh OS X). 
  • Microsoft® Windows®: Most common operating system for PC computers.
  • Macintosh OS: Standard operating system for Apple® computers.
Other operating systems, such as those listed below, are not as commonly supported. Connecting an MP3 player to computers running these operating systems will usually require additional drivers, which may not be available.
  • OS/2: IBM® operating system for PC computers
  • Linux: Open source operating system for PC or Apple computers (not typically supported out of the box).
  • Unix: AT&T® and Berkeley University for PC or Apple computers, primarily workstations (not typically supported out of the box).
Included Software: Refers to the software (usually on CD) which is packaged with the player. At a minimum, this software should allow you to play MP3's on your computer and transfer them to your MP3 player. Additional software features include ripping MP3's off of CD's, managing playlists and burning audio and data CD's.
Connection Type: Refers to how the MP3 player is connected to a computer or how information is shared between the computer and the MP3 player. This is usually done through a direct cable connection or a cradle; however, depending on the player, this may also be accomplished using a memory card reader.
Direct cable connection is through one (or more) of the following types, with USB being the most common:
  • Parallel Cable: Offering the slowest cable connection speed, parallel connection has the primary advantage that it uses a port style which is found on most of the older computers (which may not have a USB or firewire port).
    Note: Macintosh computers do not have parallel ports.
  • USB Cable: USB is a fast connection speed using a port style commonly found on most computers sold recently. Most new computers will have at least one USB port built-in.
  • Firewire: Using the IEEE-1394 standard, Firewire offers the fastest connection speed presently available. Because firewire ports are not yet standard on new computers, you may need to install a firewire port in order to use this connection type.
A cradle is a piece of hardware which remains connected to the computer and allows you to quickly connect the MP3 player without connecting and disconnecting cables. This is more important when using a parallel connection.
A memory card reader allows you to plug a memory card for your MP3 player into a reader connected to your computer in order to transfer songs directly to the card. There are three basic types of card reader, listed below in order of speed and by how they connect to the computer. The reader would need to be capable of reading the recording memory card used by your MP3 player.
  • Parallel Port Card Reader: Slowest.
  • USB Card Reader: Fast.
  • PCMCIA Card Reader: Fastest.
Built-in Memory: Refers to the amount of memory the player has built-in, which determines how much music the MP3 player can hold without using an external memory card. Everything else being equal, this should be as high as possible.
Memory Type: Refers to the type of external memory that the player can use. There are four types of memory typically used in MP3 players. SmartMedia™ and MultiMedia™/Secure Digital™ Cards are the most common types, followed by CompactFlash™, then Memory Stick and then PCMCIA cards.
SmartMedia (SMC): 45 mm x 37 mm, up to .76 mm thick.
Multimedia (MMC): 36.4 mm x 24 mm, up to 1.4 mm thick.
Secure Digital (SD): 32 mm  x 24 mm, up to 2.1 mm thick.
Secure Digital cards are similar to Multimedia cards, except that they use a different number of pins and incorporate SDMI requirements. Devices with SD slots can generally use MMC cards as well.
CompactFlash (CF): 36.4 mm x 42.8 mm
There are two types of CompactFlash memory card available.
  • Type II: up to 3.3 mm thick.
    Type II CompactFlash cards can be used with multiple brands and types of devices and offers the highest maximum size of the memory types.
  • Type I: up to 5 mm thick.
    Type I CompactFlash cards can be used with multiple brands and types of devices. While they have a higher maximum size than SmartMedia cards, they are more limited in memory size than Type II CompactFlash.
Memory Stick (MS): 21.5 mm x 50 mm, up to 2.8 mm thick.
The Memory Stick format was created by Sony® but is now offered by other manufacturer. It offers a range of memory sizes.
PCMCIA Cards: 85.6 mm x 54 mm
Short for Personal Computer Memory Card International Association, PCMCIA cards come in three types, with Type II and Type III being the most common. Because of the larger size, PCMCIA cards are rarely used in MP3 players.
  • Type I: up to 3.3 mm thick.
  • Type II: up to 5.5 mm thick.
  • Type III: up to 10.5 mm thick.
Power Supply: The type of power supply directly affects where and for how long you can use the player. An AC power supply allows stationary use without relying on battery power. A DC power supply allows use in a vehicle without using the player's batteries. If the player does not have a built-in battery, you should use either high-performance alkalines or rechargeable batteries; MP3 players are high-drain devices and will go through batteries fairly quickly. There are three types of batteries which are most commonly used (the size is usually AA or AAA).

When not using the MP3 player or when using the AC or DC power supply only for an extended period, you should remove the batteries to prevent leakage and/or corrosion.

  • AC Power Supply
  • DC Power Supply
  • Rechargeable Battery (built-in)
  • Premium Alkaline Batteries (AA, AAA): These will last the longest of the battery types. However, they are single-use and may be more expensive over the long run.
  • Rechargeable NiMH Batteries (AA, AAA): These will not last as long as alkaline batteries. However, they generally have a higher capacity than high-capacity Ni-Cd batteries. The cost per unit is higher than alkaline, but the ability to recharge the batteries will make them less expensive over the long run.
  • Rechargeable High-Capacity Ni-Cd Batteries (AA): These will typically have the lowest capacity of these three types. As with NiMH batteries, the cost per unit is higher than alkaline, but the ability to recharge the batteries will make them less expensive over the long run.
MP3 Sites On The Web  
  

Top MP3 Sites:

MP3now - A giant resource for MP3 news, software and music.  MP3now is one of the most popular MP3 resources on the web.

MP3.com - Probably the most popular MP3 resource on the Internet.  Although its search engine is not very strong, MP3.com provides a good amount of free music, news and software.

MP3place - Another good MP3 resource, MP3Place has a good amount of free software, music and news.

DailyMP3 - A huge resource of MP3 related links and software.  Visitors to the site can get daily updates on news and software.

MP3Vault - Another good collection of MP3 related resources.  MP3Vault is looking to be one of the top MP3 sites on the Internet.

MP3Planet - One of the best MP3 news archives on the Internet.

Other MP3 Sites:

http://www.mp3dd.net/
Universal MP3 links
Mp3 Top hits
Mp3 site search directory
www.doublemirrors.com/mp3/
mp3.box.sk
http://www.mp3web.com/
http://www.telesc.com/
http://www.mp3park.com/
http://www.mp3-world.net/
MPEG Layer 3 Sounds
Dimension Music
MP3 Info
A Webmaster's World of MP3.
www.audiohighway.com
www.OnlineMusic.com
www.MP3it.com

::

   AudioGrab.com 
Abstract MP3s
Acid Search
EatSleepMusic.com
Hungry Bands.com
Free MP3's on UBL
MPEG.org - Pointers and Resources
Epitonic
Benchmark
RioPort
Macintosh MP3 Information
http://www.mp3city.com
www.mp3-mac.com
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