About Samsung Galaxy S4
Samsung Galaxy S4 is a smartphone manufactured by Samsung Electronics. It was announced in New York on March 14, 2013. It is the successor to the Samsung Galaxy S3. It has new software features such as Smart Alerts, Smart Stay, and Smart Scroll, a 13-megapixel back camera, and a 4.99-inch (127 millimetres) 1080p display. The international version features an Exynos 5 Octa (octa-core) chip containing the first big.LITTLE architecture central processing unit (CPU). The CPU, with four active cores and four inactive cores, emulates a quad-core CPU. It comprises one faster quad-core cluster, and one slower quad-core cluster. Only one cluster is active at any time, with the faster cluster selected on-demand to save power. It will be available in late April 2013 on 327 networks worldwide and in 155 countries and on or before May 1 on the US networks T-Mobile and AT&T.
Samsung Galaxy S4 uses Android mobile operating system with Samsung’s custom TouchWiz “Nature UX” graphical user interface (GUI). The names of the Samsung software applications are an “S” followed by the function, for example, the voice assistant is called S Voice.
The phone employs the front-facing camera for eye tracking. A video can be paused by looking away from the screen, a page can be scrolled by tilting the screen up or down while looking at it or by swiping a hand over the screen without touching it, and previews of photos or messages can be obtained by hovering with a finger above the corresponding location of the screen. Video and photo captures can use the front and rear cameras simultaneously to produce picture-in-the-picture views. The Samsung Galaxy S4 supports High Efficiency Video Coding (HEVC) video decoding.
Hardware and design of Samsung Galaxy S4
The screen features a 4.99-inch (127 mm) PenTile RGBG Full HD Super AMOLED screen with 441.46 pixels per inch. The S4 comes with either 16GB, 32GB or 64GB of internal storage, which can be supplemented with up to an additional 64GB via the microSD card slot.
The S4 includes a multiband LTE transceiver; Includes an infrared LED that can serve as a universal remote control; Also includes a temperature sensor and a humidity sensor. The S4 comes in two regional variants that differ primarily in the internal hardware:
- Octa-core variant
The international S4 version has Samsung’s Exynos 5 Octa (octa-core) system on a chip (SoC) chip containing the first ARM big.LITTLE heterogeneous architecture central processing unit (CPU). The eight core CPU comprises a 1.6 GHz quad-core Cortex-A15 cluster and 1.2 GHz quad-core Cortex-A7 cluster. The cluster of four faster “big” A15 cores is paired with the cluster of four slower, more power-efficient “LITTLE” A7 cores. At any given time, either the big cluster is active (for maximum performance) or the LITTLE cluster (for maximum power efficiency). The switching of the active cluster is performed on demand by the chip firmware, with the migration of the running software from outgoing to incoming cores taking 20µS. The CPU emulates a single quad-core processor to the operating system and applications. The SoC also contains an IT tri-core PowerVR SGX 544 graphics processing unit (GPU).
- Quad-core variant
The version for the United States, United Kingdom (4G LTE), and other regions has Qualcomm’s Snapdragon 600 SoC containing a quad-core 1.9 GHz Krait 300 CPU and an Adreno 320 GPU.