Monday, June 21, 2010

Iphone 4

Physical size
The iPhone 4 is 4.5 x 2.31 inches, and 0.37 inch and weighs 4.8 ounces (137 grams).

The brain has an Apple A4 chip inside, just like the iPad. The A4 has few interconnected chips: A Cortex-A8 main processor unit—the main brain—paired with PowerVR SGX 535, handles the high definition graphics of the new iPhone. They are directly connected to each other and two low-power 128MB DDR SDRAM chips. As these components are in the same chip, Apple claims the iPhone 4 can process data more quickly by consuming less battery than ever.

The A4 consumes less power because its sub-components can be switched on and off when they are not needed, saving watts whenever possible.

Battery life
The battery life is 16% bigger now. Fused with the A4 processor and new display, it helps in a longer battery life: Apple says now 40% more talk time.

• Talk over 3G: 7 hours.
• Browsing over 3G: 6 hours.
• Browsing over Wi-Fi: 10 hours.
• Video: 10 hours.
• Music: 40 hours.
• Stand-by: 300 hours.

The display
The 3.5-inch multitouch screen has resolution of 960 × 640 pixels. Apple calls it as Retina Display, and 4 times as many pixels as the current iPhone 3GS' display. The screen has 326 ppi resolution, a higher definition than a magazine.

iPhone 4: The Definitive Guide

Apple says, that this IPS-based display is same technology as used in the iPad—also(800-to-1) contrast ratio which is 4 times better than the 3GS, with a higher viewing angle.

The apps have automatic advantage of the increased relative resolution, That means they will be a lot sharper for text, 3D graphics and vectorial art. However, developers have to include higher resolution bmp images to get the app look perfect.

Similar to iPhone 3GS and the iPad, the display has an oleophobic layer which makes it easier to clean.

The main camera
New iPhone has bigger sensor for the main camera. It has backlit and bigger lenses too. Instead of having a higher resolution, the sensor maintains the same 5 megapixel count. They are bigger dots,so it has a higher ISO—or sensitivity to light. Which means that you would be able to take better photos and video in low light conditions and the pics will look a lot better.

iPhone 4: The Definitive Guide

The camera has a LED flash light, that works both for photographs and video. To focus, both photos and videos, you just need to tap on the screen.

WOW, video conferencing camera at front, there's a video conference camera, with a standard VGA resolution. It can be used with third-party applications, as well as Apple's video conference solution.

 iPhone 4 has a gyroscope built-in. Which means that it can track movement with a very high precision, much higher than accelerometers in previous iPhones. It has 3-axis, so it is capable of detecting pitch, roll, and yaw. Coupled with accelerometer, it has 6-axis motion sensing.

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