iPod

The current iPod line. From left to right, the fifth-generation iPod (with Universal dock), second generation iPod nano and second generation iPod shuffle

iPod is a brand of portable media players that is designed and marketed by Apple and was launched on October 23 2001. Since October 2004, iPod sales have dominated the market for digital music players in the United States. Devices in the iPod range are primarily digital music players, designed around a central click wheel — although the iPod shuffle has buttons only. The full-sized model stores media on an internal hard drive, while the smaller iPod nano and iPod shuffle use flash memory. Like many digital audio players, iPods can also serve as external data storage devices.

In addition to playing music, iPods with display screens can display calendars, contact information, and text files, and play a limited range of games. Models introduced in 2004 include the ability to display photos and the fifth-generation iPod, introduced in 2005, can additionally play video files. In January 2007, Apple announced the iPhone, combining the features of a video-capable iPod with integrated mobile phone and mobile internet capabilities.

Apple's iTunes software is used for transferring music (as well as photos, videos, games, contacts and calendars, for models that support those features). As a free jukebox application, iTunes stores a comprehensive library of music on the user's computer and can play, burn, and rip music from a CD. It can also sync photos and videos.

Apple focused its development on the iPod's unique user interface and its ease of use, rather than on technical capability. The iPod is currently the world's best-selling range of digital audio players and its worldwide mainstream adoption makes it one of the most popular consumer brands. Some of Apple's design choices and proprietary actions have, however, led to criticism and legal battles.

History and design

The iPod came from Apple's digital hub strategy, as the company began creating software for the growing market of digital devices being purchased by consumers. While digital cameras, camcorders and organizers had well-established mainstream markets, the company found digital music players lacking in user interface design and decided to develop its own.

The name was proposed by Vinnie Chieco, a freelance copywriter, who (with others) was called by Apple to figure out how to introduce the new player to the public. As soon as Chieco saw a prototype for the player he thought of the movie 2001: A Space Odyssey and the phrase: "Open the pod bay door, Hal!", which refers to the white EVA Pods of the Discovery One spaceship. At that time "iPod" was a name that Apple registered for Internet kiosks, but never put to use.

Apple's hardware engineering chief Jon Rubinstein assembled a team of engineers to design it, including Tony Fadell, Stan Ng and Jonathan Ive. Additionally, Sparkfactor Design has designed some of the iPod hardware from 2002-2004. They developed the product in less than a year and it was unveiled on October 23 2001. CEO Steve Jobs announced it as a Mac-compatible product with a 5 GB hard drive that put "1000 songs in your pocket."

Uncharacteristically, Apple did not develop the iPod's software entirely in-house. Instead, Apple began with PortalPlayer's reference platform which was based on 2 ARM cores. The platform used rudimentary software running on a commercial microkernel embedded operating system. PortalPlayer had previously been working on an IBM-branded MP3 player with Bluetooth headphones. Apple contracted another company, Pixo, to help design and implement the user interface, under the direct supervision of Steve Jobs.

Once established, Apple continued to refine the software's look and feel. Starting with the iPod mini, the Chicago font (once used on early Macintosh computers) was replaced with Espy Sans, which was originally used in eWorld and Copland. Later iPods switched fonts again to Podium Sans — a font similar to Apple's corporate font Myriad. The iPods with color displays then adopted some Mac OS X themes like Aqua progress bars, as well as brushed metal in the lock interface.

Stephen Colbert has 10,000 iPods for sale on Ebay.

User interface

The iPods with color displays use high quality anti-aliased graphics and text, with sliding animations. These iPods have five buttons and the newer generations have the buttons integrated into the click wheel — an innovation which gives an uncluttered, minimalistic interface. The buttons are:

• Menu — to traverse backwards through the menus, and toggle the backlight on older iPods when held
• Center — to select a menu item
• Play / Pause — this doubles as an off switch when held
• Fast Forward (When held)/ Skip Forward
• Fast Reverse (When held)/ Skip Backwards

The operations such as scrolling through menu items and controlling the volume are performed by using the click wheel in a rotational manner. These iPods also have a Hold switch at the top, which prevents accidental button presses. Newer iPods automatically pause playback when the headphones are unplugged from the headphone jack, but playback does not resume when the headphones are re-inserted. However, in newer iPods (excluding iPod shuffles), when the headphones are re-inserted into the headphone jack when the iPod is asleep, the iPod will automatically wake up to the last screen viewed before going to sleep. An iPod that has crashed or frozen can be reset by switching 'Hold' on then off, then holding Menu and Center (Menu and Play on the 3G iPod) for 6 seconds.

The iPod shuffle does not use a click wheel and instead has five buttons positioned differently to the larger models. It has a Play / Pause button in the center, surrounded by four buttons: Volume Up / Down and Skip Forward / Backwards. This button arrangement is shared by the Apple Remote (which ships with all Apple computers with Front Row and the Universal Dock).

Software

The iPod can play MP3, AAC/M4A, Protected AAC, AIFF, WAV, Audible audiobook, and Apple Lossless audio file formats. The iPod photo introduced the ability to display JPEG, BMP, GIF, TIFF, and PNG graphic file formats. The fifth generation iPod (which has a 320x240 pixel display) can also play MPEG-4 (H.264/MPEG-4 AVC), and QuickTime video formats, with restrictions on video dimensions, encoding techniques and data-rates.

Unlike most other media players, Apple does not support Microsoft's WMA audio format — but a converter for non-DRM WMA files is provided with the Windows version of iTunes. MIDI files cannot be played, but can be converted to audio files using the "Advanced" menu on iTunes. Alternative open-source audio formats such as Ogg Vorbis and FLAC are not supported.

Each time an iPod connects to its host computer, iTunes will synchronize entire music libraries or music playlists and the user can choose for automatic or manual synchronization. Song ratings can be set on the iPod and synchronized later to the iTunes library, however, only one host computer is allowed.

iTunes Store

Main articles: iTunes and iTunes Store

The iTunes Store (formerly iTunes Music Store) is an online media store run by Apple and accessed via iTunes. It was introduced on 29 April 2003 and it sells individual songs, with typical prices being US$0.99, EU€0.99, or GB£0.79 per song. iPods are the only portable music players that can play the purchased music. The store became the market leader soon after its launch and Apple announced the sale of videos through the store on 12 October 2005. Full-length movies became available on 12 September 2006.

Purchased audio files use the AAC format with added encryption. The encryption is based on Apple's FairPlay digital rights management (DRM) system. Up to five authorized computers and an unlimited number of iPods can play the files. Music files without DRM can be created by burning the files onto an audio CD, then re-compressing to a different lossy format, although this results in reduced quality. The DRM encryption on Apple's AAC audio files can also be removed using third-party applications.

iPods cannot play music files from competing music stores -- such as Napster or MSN Music -- that use rival DRM technologies like Microsoft's protected WMA or RealNetworks' Helix DRM. RealNetworks claims that Apple is creating problems for itself, by using FairPlay to lock users into using the iTunes Store. Steve Jobs stated that Apple makes little profit from song sales, but Apple uses the store to promote iPod sales.

iPods can, of course, play DRM-less music files in supported file formats from other competing music stores - such as eMusic.

File storage

All iPods can function as mass storage devices to store data files. This function is controlled by the "Enable disk use" check in box iTunes. (Originally, when iPods had only FireWire connections this function was labelled "Enable Fire Wire disk use".)

If the iPod is formatted on a Mac OS X computer it uses the HFS Plus file system format. If it is formatted on Windows, the FAT32 format is used because Windows cannot access HFS Plus filesystems. With the advent of the Windows-compatible iPod, the iPod's default file system switched from HFS Plus to FAT32, although it can be reformatted to either filesystem (excluding the iPod shuffle which is strictly FAT32). A FAT32 file system can accommodate only files smaller than 4 gigabytes.

An iPod formatted as HFS Plus is able to serve as a boot disk for a Mac computer, allowing one to have a portable operating system.

Unlike most other MP3 players (including PlaysForSure devices), simply copying files to the drive will not allow the iPod to properly access them (although some third-party iPod software allows this). Instead, the user must use iTunes or a compatible third-party software to load audio, videos and photos in a way that makes them playable and viewable.

iTunes cannot transfer songs or videos from device to computer (although iTunes 7 allows it for music purchased online). The media files are stored on the iPod in a hidden folder, together with a proprietary database file. The hidden content can be accessed on the host operating system however, by enabling hidden files to be shown. The audio can then be recovered manually by dragging the files or folders onto the iTunes Library or by using third-party software.

In January 2006, Apple's iTunes store had reached a huge milestone: a sale of over two billion songs sold to people around the world.

Additional features

The larger models have limited PDA-like functionality and can display text files. Contacts and schedules can also be viewed and synchronized with the host computer. Some built-in games are available, including Brick, Parachute, Solitaire and Music Quiz. Brick (a clone of Breakout) was originally invented by Apple co-founder Steve Wozniak in the 1970s. A firmware update released in September 2006 brought several new features to 5th generation iPods including adjustable screen brightness, gapless playback, and downloadable games (available for purchase from the iTunes Store).

Open-source alternatives

An open-source firmware called Rockbox allows the iPod nano, mini, and all display-capable iPods after the third generation (excluding the 80Gb 5.5th generation) to play Ogg Vorbis, FLAC, Musepack, WavPack, Shorten, and MIDI files, but not FairPlay-encrypted files. Rockbox also offers gapless playback and a more sophisticated equalizer but is in a testing stage as of September 2006. Open-source alternatives to iTunes include gtkpod, Yamipod and MediaChest.

The iPodLinux project has an ARM version of the Linux kernel alongside an interface called "Podzilla" that runs on all iPods, although only the first, second and third generations are officially supported by the developers. The iPod shuffle is not supported and the fifth generation iPod is likewise unsupported, though iPodLinux can be successfully installed.

Chipsets and electronics

Microcontroller

• iPod 1G, 2G, 3G — Two ARM 7TDMI-derived CPUs running at 90 MHz.
• iPod 4G, 5G, iPod mini, iPod nano 1G — Variable-speed ARM 7TDMI CPUs, running at a peak of 80 MHz to save battery life.
• iPod nano 2G — Samsung System-On-Chip, based around an ARM processor.
• iPod shuffle — SigmaTel STMP3550 chip that handles both the music decoding and the audio circuitry.

Audio chip

• All iPods except the shuffle — Various audio codecs manufactured by Wolfson Microelectronics.

Storage medium

• iPod 1G—5G — 1.8 inch hard drives (ATA, 4200 rpm with proprietary connectors) made by Toshiba
• iPod mini — 1 inch Microdrives manufactured by Hitachi and Seagate
• iPod nano — Flash memory from Samsung, Toshiba and others.
• iPod shuffle — Flash memory

The iPod's operating system is stored on its dedicated storage medium. An additional NOR flash ROM chip (either 1 MB or 512 KB) contains a bootloader program that tells the device to load its OS from the storage medium. Each iPod also has 32 MB of RAM, although the 60 and 80 GB fifth generation have 64 MB. A portion of the RAM is used to hold the iPod OS loaded from firmware, but the majority of it serves to cache songs from the storage medium. For example, an iPod could spin its hard disk up once and copy about 30 MB of upcoming songs into RAM, thus saving power by not requiring the drive to spin up for each song.

The first and second generation iPods used internal lithium polymer batteries. Later generations and models used lithium-ion batteries, while the nano and shuffle continue to use lithium polymer. The touch-wheels were initially provided by Synaptics.

Connectivity

Two iPod chargers, one with a FireWire (left) and one with a USB connection.

Originally, a FireWire connection to the host computer was used to update songs or recharge the battery. The battery could also be charged with a power adapter that was included with the first 4 generations.

The third generation began including a dock connector, allowing for FireWire or USB connectivity. This provided better compatibility with PCs, as most of them did not have FireWire ports at the time. However, the device could not be charged over USB, so the FireWire cables were nonetheless needed to connect to the AC adapter. The dock connector also brought opportunities to exchange data, sound and power with an iPod, which ultimately created a large market of accessories, manufactured by third parties such as Belkin and Griffin. The 2nd generation iPod shuffle uses a single 3.5 mm jack which acts as both a headphone jack and a data port for the dock.

The iPod mini and the fourth generation iPod allowed recharging via USB and eventually Apple began shipping iPods with USB cables instead of FireWire, although the latter was available separately. As of the 5th generation iPod, Apple discontinued using FireWire for data transfer and made a full transition to USB 2.0, due to its widespread adoption. FireWire was then used for recharging only.

Models

Model (and generation)		Image	Capacity	Changes introduced	Connection	Original release date	Launch price (US$)
iPod	1G		5, 10 GB	First release. Mechanical scroll wheel.	FireWire	23 October 2001	$399, $499
	2G		10, 20 GB	Touch-sensitive wheel. FireWire port had a cover. Hold switch revised.	FireWire	17 July 2002	$399, $499
	3G		10, 15, 20, 30, 40 GB	Central row of touch-sensitive buttons. Dock Connector port introduced.	FireWire (USB for syncing only)	28 April 2003	$299, $399, $499
	4G / photo		20, 30, 40, 60 GB	Buttons integrated to form "Click Wheel". Color display with photo viewer introduced in October 2004. It replaced the monochrome model in June 2005.	FireWire or USB	19 July 2004	$299, $349, $399, $449
	5G / 5.5G (Update)		30, 60, 80 GB	Slimmer design, introduced in white and black variants. Larger screen with video player and lyrics support. No AC adapter, Universal Dock, or A/V cables included. The September 2006 revision (often called generation 5.5) featured a brighter display, longer video battery life, and a music search function.	USB (FireWire for charging only)	12 October 2005	$299, $399 (later $249, $349)
iPod mini	1G	iPod Mini 1G	4 GB	First release. Available in 5 colors. Introduced the "Click Wheel", later adopted by the 4G iPod.	USB or FireWire	6 January 2004	$249
	2G		4, 6 GB	Brighter color variants with longer battery life. Click Wheel lettering matched body color. No AC adapter and discontinued gold model.	USB or FireWire	22 February 2005	$199, $249
iPod nano	1G		1, 2, 4 GB	First release. Successor to the iPod mini. Slimmer design with flash memory, color screen and lyrics support.	USB (FireWire for charging only)	7 September 2005	$149, $199, $249
	2G		2, 4, 8 GB	Anodized aluminium case in 6 colors. Brighter screen and longer battery life and music search function.	USB (FireWire for charging only)	12 September 2006	$149, $199 $249
iPod shuffle	1G		512 MB, 1 GB	First release. The iPod without a screen or click wheel input. First iPod to use flash memory instead of hard drive storage.	USB	11 January 2005	$99, $149 (later $69, $99)
	2G		1 GB	Aluminum case with smaller form factor, plus built-in clip. On January 30 Apple introduced 4 new colors: blue, green, pink and orange with the same characteristics as the silver.	USB (via dock only)	12 September 2006	$79

Timeline of iPod model releases

Each new generation usually has more features and refinements while typically being smaller and lighter than its predecessor. Notable changes include the touch-sensitive click wheel replacing the mechanical scroll wheel, use of color displays, and flash memory replacing hard disks. Discontinued models include four generations of the full-sized iPod, two generations of the iPod mini and the first generation of both the nano and the shuffle. More information about all released iPods is available on Apple's Knowledge Base website.

The first generation iPod was only Mac-compatible, although Apple later added limited Windows support with the second generation iPods. Windows users required third-party software such as Musicmatch Jukebox, ephPod or XPlay to manage their music. Musicmatch was included on the bundled CD. After Apple released the Windows version of iTunes on 16 October 2003, every iPod was made fully compatible with either Mac or Windows.

Special edition models

In December 2002, Apple unveiled its first limited edition iPods, with either Madonna’s, Tony Hawk’s, or Beck’s signature or No Doubt's band logo engraved on the back for an extra US$49.

On 26 October 2004, Apple introduced a special edition of its fourth generation monochrome iPod, designed in the color scheme of the album (How to Dismantle an Atomic Bomb) by Irish rock band U2. It had a black case with a red click wheel and the back had the engraved signatures of U2's band members. This iPod was updated alongside the iPod photo and fifth generation iPod.

On 13 October 2006, Apple released a special edition 4 GB red iPod nano as part of the (PRODUCT)^RED campaign. Three weeks later, an 8 GB version was released and both of them sold for the same price as the standard color models. US$10 from each sale is donated to the Global Fund to fight AIDS.

Apple also released Special Edition Harry Potter iPods to accompany the iPod photo. They were engraved with the Hogwarts Crest on the back and were only available to purchasers of the Harry Potter audiobooks. They were updated when the 5G iPods were released, but were only available for a short time.

A list of iPod model numbers is also available.

Criticisms

Battery issues

The advertised battery life on some models was very different from the real-world achievable life. For example, the fifth generation 30 GB iPod is advertised as having up to 14 hours of music playback. A CNET review found this to be virtually unachievable and found the average life to be less than 8 hours.

In 2003, class action lawsuits were brought against Apple complaining that the battery charges lasted for shorter lengths of time than stated and that the battery degraded over time. The lawsuits were settled by offering individuals either US$50 store credit or a free battery replacement. Despite its own criticisms, Apple later complained that its competitor, Sony, had misled consumers in its advertising for Sony's music player. Apple complained that Sony had not considered real-world usage.

iPod batteries are not designed to be removed or replaced by the user. Some iPod users have been able to open the iPod case themselves, usually following instructions provided by third-party vendors of iPod replacement batteries. However, the procedure can be tricky, and is poorly suited for people who are uncomfortable working with electronic components. Compounding this problem, Apple initially would not replace worn-out batteries. The official policy was that the customer should buy a refurbished replacement iPod, at a cost almost equivalent to a brand new one. All lithium-ion batteries eventually lose capacity during their lifetime (guidelines are available for prolonging life-span) and this situation led to a small market for third-party battery replacement kits.

Apple announced a battery replacement program on 14 November 2003, a week before a high publicity stunt and website by the Neistat Brothers. The initial cost was US$99, but it was lowered to US$59 in 2005. One week later, Apple offered an extended iPod warranty for US$59. Third-party companies offer cheaper battery replacement kits that often use higher capacity batteries. For the iPod nano, soldering tools are needed because the battery is soldered onto the main board. The fifth generation iPod has its battery attached to the backplate with adhesive.

Bass response

The third generation iPod had a weak bass response, as shown in audio tests. The combination of the undersized DC-blocking capacitors and the typical low-impedance of most consumer headphones form a high-pass filter, which attenuates the low-frequency bass output by up to 10 dB. Similar capacitors were used in the fourth generation iPods. The problem is reduced when using high-impedance headphones and is completely masked when driving high-impedance (line level) loads. The first generation iPod shuffle uses a dual-transistor output stage rather than a single capacitor-coupled output, and thus does not exhibit reduced bass response for any load.

Equalizer

If the sound is enhanced with the iPod's software equalizer (EQ), some EQ settings — like R&B, Rock, Acoustic, and Bass Booster — can cause bass distortion too easily. The equalizer amplifies the digital audio level beyond the software's limit, causing distortion (clipping) on songs that have a bass drum or use a bassy instrument, even when the amplifier level is low. For portable players with onboard equalization, this is a common problem. One possible workaround is to reduce the volume level of the recorded MP3 by modifying the audio files. The iPod's companion iTunes software has a feature for doing this for either single files or in batches — for both standard MP3 files and for iTunes DRM-encrypted music.

Reliability and durability

Media reports have criticized the iPod for its short lifespan, difficulty with battery replacement, fragile harddrives, and easily scratched nano screens . Other criticism has focused on planned obsolescence , including a popular Saturday Night Live skit that mocked the rapid evolution of iPod design.

In late 2005, many users complained that the surface of the 1st generation iPod nano can become scratched easily, rendering the screen unusable for viewing album art or photos. A class action lawsuit was also filed. Apple initially considered the issue a minor defect, but later began shipping these iPods with protective sleeves.

A 2005 survey conducted on the MacInTouch website found that the iPod has an average failure rate of 13.7%. Some models, it concluded, are more durable than others.

Worker exploitation

On 11 June 2006, a British newspaper Mail on Sunday reported that iPods are mainly manufactured by workers who earn no more than US$50 per month and work 15-hour shifts.

Apple investigated the case with independent auditors and found that, while some of the plant's labor practices met Apple's Code of Conduct, others did not: employees worked over 60 hours a week 35% of the time, and employees worked more than six consecutive days about 25% of the time. Apple's supplier—which initially denied the abuses—has promised to disallow workers from working more hours than allowed under the Code. Apple has hired a workplace standards auditing company, Verité, and joined the Electronic Industry Code of Conduct Implementation Group to oversee these measures.

On December 31, 2006, workers at the Taiwanese factory (owned by Foxconn Technology Group) in question formed a union. The union is affiliated with the All-China Federation of Trade Unions, which is controlled by the Chinese government.

Patent disputes

In 2005, Apple Computer faced two lawsuits claiming patent infringement by the iPod and its associated technologies: Advanced Audio Devices claimed the iPod breached their patent on a "music jukebox", while a Hong Kong-based IP portfolio company called Pat-rights filed a suit claiming that Apple's FairPlay technology breached a patent issued to inventor Ho Keung Tse. The latter case also includes the online music stores of Sony, RealNetworks, Napster, and Musicmatch as defendants.

Apple's application to the United States Patent and Trademark Office for a patent on "rotational user inputs", as used on the iPod's interface, received a third "non-final rejection" (NFR) in August 2005. Also in August 2005, Creative Technology, one of Apple's main rivals in the MP3 player market, announced that it held a patent on part of the music selection interface used by the iPod, which Creative dubbed the "Zen Patent", granted on 9 August 2005. On 15 May 2006, Creative filed another suit against Apple for patent infringement with the United States District Court for the Northern District of California. Creative also asked the United States International Trade Commission to investigate whether Apple was breaching U.S. trade laws by importing iPods into the United States.

On 24 August 2006, Apple and Creative announced a broad settlement to end their legal disputes. Apple will pay Creative US$100 million for a paid-up license, to use Creative's awarded patent in all Apple products. Apple also negotiated a scheme where it can recoup part of its payment, if Creative is successful in licensing this patent. Creative then announced its intention to produce iPod accessories by joining the Made for iPod program.

Sales

See also: Apple iPod advertising

Since October 2004, the iPod has dominated digital music player sales in the United States, with over 90% of the market for hard drive-based players and over 70% of the market for all types of players. During the year from January 2004 to January 2005, the high rate of sales caused its U.S. market share to increase from 31% to 65% and in July 2005, this market share was measured at 74%. The release of the iPod mini helped to ensure this success at a time when competing flash-based music players were once dominant.

Apple and several industry analysts suggest that iPod users are likely to purchase other Apple products such as Mac computers. On 8 January 2004, Hewlett-Packard (hp) announced that they would sell hp-branded iPods under a license agreement from Apple. Several new retail channels were used — including Wal-Mart — and these iPods eventually made up 5% of all iPod sales. In July 2005, hp stopped selling iPods due to unfavorable terms and conditions imposed by Apple.

Sales Chart

iPod sales according to Apple's quarterly financial results are shown below. From 2002 Q1 to 2007 Q1, total iPod sales reached 88,701,000 units as of January 2007. Apple's fiscal year ends in September. Hence, the Christmas holiday season is Q1 of the next year. So in this chart, all Q1 points represent sales during the Christmas Holiday Season. In the 2006 holiday season, Apple sold more than 21 million iPods, an all-time high.

Holiday Season sale figures are in green.

iPod quarterly sales have steadily risen over time.

File:Apple 2007Q1.svg

This pie chart shows a breakdown of Apple's revenue from different products in the first fiscal quarter of 2007. It uses the categories laid out in Apple's literature.

Fiscal quarter	iPods sold
2002 Q1	125,000
2002 Q2	57,000
2002 Q3	54,000
2002 Q4	140,000
2003 Q1	219,000
2003 Q2	78,000
2003 Q3	304,000
2003 Q4	336,000
2004 Q1	733,000
2004 Q2	807,000
2004 Q3	860,000
2004 Q4	2,016,000
2005 Q1	4,580,000
2005 Q2	5,311,000
2005 Q3	6,155,000
2005 Q4	6,451,000
2006 Q1	14,043,000
2006 Q2	8,526,000
2006 Q3	8,111,000
2006 Q4	8,729,000
2007 Q1	21,066,000
Total	88,701,000

iPod Impact of Apple Revenue

In its first quarter results of 2007, Apple reported record revenue of US$7.1 billion — its highest quarterly revenue in the company's history and record net quarterly profit of $1.0 billion. Most of this revenue is attributed to iPod sales. According to Apple's Financial Report nearly 48% of Apple's revenue is generated from iPod Business Division. This is a 2% drop from 2006 Q1 revenue breakdown, largely due to 79% increase in sales of Apple portables and 29% increase in Other Music Related Products and Services. The chart on the right shows the breakdown for 2007 Q1.

Industry impact

iPods have won several awards ranging from engineering excellence, to most innovative audio product, to 4th best computer product of 2006. iPods often receive favorable reviews; scoring on looks, clean design and ease of use. PCWorld says that iPods have "altered the landscape for portable audio players".

Several industries are tailoring their products to work better with both the iPod and the AAC audio format. Examples include CD copy-protection schemes, and mobile phones from Sony Ericsson and Nokia that play AAC files rather than WMA. Microsoft's Zune device also supports AAC and it has adopted a similar closed DRM model used by iPods and the iTunes Store, despite Microsoft previously marketing the benefits of choice with their PlaysForSure model. Podcasting and download charts have also seen mainstream success.

Accessories

File:Made for iPod logo.png

The Made for iPod logo, introduced by Apple in 2005, badges officially licensed accessories which electrically connect to the iPod. These accessories must pass a certification process and are guaranteed not to harm the attached iPod.

Many companies produce accessories that are designed for iPods. Apple also sells and mass produces accessories for the iPod. This market is sometimes described as the iPod ecosystem. Some accessories add extra features that other music players have, such as sound recorders, FM radio tuners, wired remote controls, and audio/visual cables for TV connections. Other accessories offer more unique features like the Nike + iPod pedometer and the iPod Camera Connector. Other popular accessories include external speakers, wireless remote controls, protective cases/films and even wireless earphones. Among the first, officially licensed iPod accessory manufacturers were Griffin Technology, Belkin, JBL, Bose, Monster Cable and SendStation. As of today the iPod ecosystem counts more than 3,000 accessories from countless manufacturers. Officially licensed accessories can be recognized by the Made for iPod logo.

Earphones

Two designs of iPod earbuds. Second generation iPod nanos, Fifth Generation iPods shipped after September 2006 and iPod shuffles shipped after February 30, 2007 come with the style of earbuds shown at right. All other models ship with earbuds similar to those shown at left.

All iPods ship with white earphones (or "earbuds") which have been revised two times. The 1st type of headphones appeared on 1st and 2nd generations while the 2nd type appeared on all ipods up until the 2nd Gen. Nanos and Videos. The earphones and cords have become symbolic of the brand, and advertisements feature them prominently, often contrasting the white earphones with dark silhouettes.

Car and airplane integration

BMW released the first iPod automobile interface, allowing drivers of newer BMW vehicles to control their iPod using either the built-in steering wheel controls or the radio head unit buttons. Apple announced in 2005 that similar systems would be available for additional vehicle brands, including Mercedes-Benz, Volvo, Nissan, Alfa Romeo, Ferrari, Acura, Audi, Honda, Renault and Volkswagen.

Some independent stereo manufacturers including JVC, Pioneer, Kenwood, Alpine and Harman Kardon also have iPod-specific integration solutions. Alternative connection methods include using adaptor kits (via the cassette deck or the CD changer port), RCA inputs, or FM transmitters such as the iTrip, although personal FM transmitters are illegal in some countries.

Some car manufacturers have decided to add an external audio jack which can play music from iPods: Toyota on the Camry and Yaris; Jeep in the Wrangler and Grand Cherokee; and in the Chrysler Sebring. All new lower-cost GM vehicles come standard with an external audio jack suitable for iPod use.

Beginning in mid-2007, four major airlines, United, Continental, Delta, and Emirates reached agreements to install iPod seat connections. The free service will allow passengers to power and charge their iPod, and view their video and music libraries on individual seat-back displays. Originally KLM and Air France were reported to be part of the deal with Apple, but they later released statements explaining that they were only contemplating the possibility of incorporating such systems.

Docks

The dock allows this first generation iPod nano to stand upright while charging and syncing.

See also: dock connector

Apple and other manufacturers offer docks for the different variations of the iPod. Third party docks can be used to play media through stereo systems, etc. Apple's docks simply hold the iPod upright while charging and syncing. The docks have a headphone jack line out so the music on the iPod may be played over third party stereos. Docks made for iPods with video capability also include an S-video line out. Apple makes separate docks for both generations of the iPod nano and second generation iPod shuffle (the first generation plugs directly into a USB port; the second generation ships with the dock). 5G iPods require the Universal Dock.

The iPod Universal Dock is a dock manufactured and sold by Apple that is compatible with all iPods with a dock connector. This includes all iPods except for the first and second generations and both generations of the iPod shuffle. The Universal Dock can charge an iPod's battery and can also be used to sync an iPod with a PC or Mac, or to connect to a home audio system or television. It has an infrared receiver on the front, allowing the user to control basic functions of the iPod using the standard Apple Remote. On the back, it has the standard iPod 30 pin Dock connector, 1/8" Line Out connector, capable of outputting video, images and sound, as well as an S-Video output connector. The S-Video output connector is the standard Apple style, capable of being used as a composite output with the proper adapter.

The top of the dock has a space capable of receiving one of many "Dock Adapters", which are plastic inserts that adjust the space to a particular iPod. The Dock Adapters are numbered, with different adapters corresponding to different models of iPod. The Universal Dock includes some of these, newer iPods ship with the appropriate adapter, and they are also available from the Apple Store. Though the dock can be used without an adapter, the resulting insecure fit may cause the male dock connector to break.

See also

• Comparison of iPod Managers
• Comparison of portable media players

References

External links

• Apple iPod — Official website
• The first iPod advertisement
• Apple's 21st-Century Walkman — Brent Schlender, Fortune, 30 October 2001
• iPod Nation — Steven Levy, Newsweek, 26 July 2004
• Behind the Music — Ken Aaron, Cornell Engineering, 2005
• The Perfect Thing - Steven Levy, Wired, November 2006