iPhone
Posted On Monday, August 18, 2008 at by am.punk.rockThe iPhone is an Internet-enabled multimedia smartphone designed and marketed by Apple Inc. It has a multi-touch screen with virtual keyboard and buttons, but a minimal amount of hardware input. The iPhone's functions include those of a camera phone and portable media player (equivalent to the iPod) in addition to text messaging and visual voicemail. It also offers Internet services including e-mail, web browsing, and local Wi-Fi connectivity. The first generation phone hardware was quad-band GSM with EDGE; the second generation also adds UMTS with HSDPA.
Apple announced the iPhone on 9 January 2007. The announcement was preceded by rumors and speculation that circulated for several months. The iPhone was initially introduced in the United States on 29 June 2007 and is in the process of being introduced worldwide. It was named Time magazine's Invention of the Year in 2007. On 11 July 2008, the iPhone 3G was released and supported faster 3G data speeds and Assisted GPS.
Specifications
Features common to both versions
- Screen size: 3.5 in (89 mm)
- Screen resolution: 480×320 pixels at 163 ppi, with 3:2 aspect ratio
- Input devices: Multi-touch screen interface plus a "Home" button
- Built-in rechargeable, non-removable battery
- 2 megapixel camera
- Location finding by detection of cell towers and Wi-Fi networks
- Samsung S5L8900 (412 MHz ARM 1176 processor, PowerVR MBX 3D graphics co-processor)
- Memory: 128 MB DRAM
- Storage: 8 GB or 16 GB flash memory
- Operating System: iPhone OS
- Quad band GSM / GPRS / EDGE: GSM 850 / 900 / 1800 / 1900
- Wi-Fi (802.11b/g)
- Bluetooth 2.0 with EDR
Original model
- 4 GB model (discontinued after two months)
- Size: 4.5 inches (115 mm) (h) × 2.4 inches (61 mm) (w) × 0.46 inch (11.6 mm) (d)
- Weight: 135 g (4.8 oz)
- Battery has up to 8 hours of talk, 6 hours of Internet use, 7 hours of video playback, and up to 24 hours of audio playback, lasting over 250 hours on standby.
- Headphone jack (recessed)
- Digital SAR of 0.974 W/kg.
3G model
- Color: Black (8 GB or 16 GB) or white (16 GB)- Size: 4.5 inches (115.5 mm) (h) × 2.4 inches (62.1 mm) (w) × 0.48 inch (12.3 mm) (d)
- Weight: 133 g (4.7 oz)
- Headphone jack (non-recessed)
- Battery has up to 10 hours of 2G talk, 5 hours of 3G talk, 5 (3G) or 6 (Wi-Fi) hours of Internet use, 7 hours of video playback, and up to 24 hours of audio playback, lasting over 300 hours on standby.[27]
- Tri band UMTS / HSDPA: UMTS 850 / 1900 / 2100
- Assisted GPS, with preference to location based on Wi-Fi or cell towers
- Digital SAR Rating: 1.38 W/kg
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MP3
Posted On Friday, August 15, 2008 at by am.punk.rockMPEG-1 Audio Layer 3, more commonly referred to as MP3, is a digital audio encoding format using a form of lossy data compression.
It is a common audio format for consumer audio storage, as well as a de facto standard encoding for the transfer and playback of music on digital audio players.
MP3 is an audio-specific format that was co-designed by several teams of engineers at Fraunhofer IIS in Erlangen, Germany, AT&T-Bell Labs in Murray Hill, NJ, USA, Thomson-Brandt, and CCETT. It was approved as an ISO/IEC standard in 1991.
MP3's use of a lossy compression algorithm is designed to greatly reduce the amount of data required to represent the audio recording and still sound like a faithful reproduction of the original uncompressed audio for most listeners, but is not considered high fidelity audio by audiophiles. An MP3 file that is created using the mid-range bit rate setting of 128 kbit/s will result in a file that is typically about 1/10th the size of the CD file created from the original audio source. An MP3 file can also be constructed at higher or lower bit rates, with higher or lower resulting quality. The compression works by reducing accuracy of certain parts of sound that are deemed beyond the auditory resolution ability of most people. This method is commonly referred to as perceptual coding. It internally provides a representation of sound within a short term time/frequency analysis window, by using psychoacoustic models to discard or reduce precision of components less audible to human hearing, and recording the remaining information in an efficient manner. This is relatively similar to the principles used by JPEG, an image compression format.
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