Sakthi IT Infos
Some new Tech Infos
Types of TV :
LED : Like an LCD TV it uses light-emitting diodes (LEDs) to backlight the display instead of the cold cathode fluorescent lights used in LCD TV. By using these LEDs, the LED TV needs less power and produce less heat. The TV panel is also thin.
OLED: OLED TVs are better than LCD/LED TV because they use an OLED backlight which is constituted by a layer of organic LEDs controlled at the pixel level, to achieve absolute black and stunning levels of contrast. But the negative point is that the OLED TVs are too costly and aren’t so much brighter compared to the LCD/LED TVs
OLED displays are often found on high-end TVs
QLED: QLED is a premium range of LED TVs from Samsung. The difference with the LED TV is that they use a new illumination technology called Quantum Dot. This translates to better, brighter grey scale and color, and enhances the HDR which makes colors more natural and improves contrasts, getting closer to reality.
Different types of Operating System (for computers):
Windows: The most popular one. Bases on an MS-DOS Kernel
Mac: Developed by Apple, closed source code and based on a Hybrid Kernel XNU
Linux: Open source, developed by the Linux community and bases on a proprietary kernel
Chrome OS: Developed by Google only for Chromebooks , proprietary kernel based on the Chrome web browser
4G (LTE): It appeared in end 2011 with therorical 150Mbps of download
4G+ (LTE-A): The same as the 4G but with 300Mbps download
5G: Announced in 2018, it promises (theorically) with download up to 10Gbps. Some carriers are planning to deploy 5G in selected countries by the end of 2018
Machine learning has taken some massive strides forward in the past few years, even emerging to assist and enhance Google’s core search engine algorithm. But again, we’ve only seen it in a limited range of applications. It won’t be long before machine learning becomes a kind of “new normal,” with people expecting this type of artificial intelligence as a component of every form of technology.
Augmented Reality (AR): AR is the integration of digital information with the user's environment in real time.
Virtual reality (VR): creates a totally artificial environment (completely isolated from the real world)
Artificial Intelligence (AI): Creates intelligent machines that could react and work like humans. Now it’s used in some smartphone camera like the Huawei P20 PRO. As an example, this AI technology in this phone helps to take better photos
Different types of High Definition connections:
HDMI: High Definition Multimedia Interface. (Digital audio and video interface.)
The HDMI has a connector with 19pins and we got 3 different types and sizes
1. Type A (normal)- standard use : PC,Monitors
2. Type C (mini)-used by the video and photo cameras
3. Type D (micro) –used by the tablets and smartphones
Resolution 4K VS FHD:
FHD : 1920x1080p
4K video resolution has four times the resolution of 1080p FHD video.
There are two standard resolutions for 4K video:
Native 4K with 4096x2160p and 4K UHD with 3840x2160p.
Called SuperSpeed+. Max speed: 10Gbps.double the speed of USB 3.0. Compatible with USB 2.0 and USB 3.0.maximum power output :20V and 5A.smilar size of USB 2.0 Micro-B. Apple new Macbooks have only USB Type-C ports.
Bluetooth 5.0: Bluetooth 5 will allow communication wirelessly with devices up to 400 meters away in clear line of sight (theorically). For comparison Bluetooth 4.2 maximum range is up to 100 m
SSD vs HDD:
SSD-Solid State Disk.
HDD: Hard Disk Drive.
Both are data storage devices.
SSD: there are no moving parts, the information is stored in microchips and it’s a technology called NAND flash memory. So it’s much faster, and consumes less power.
HDD is a mechanical device so it draws more power. There is also spinning sound. We have 3 types of HDD spinning speeds: 5400rpm, 7200rpm and 10000rpm
2 types of SSD:
1. SATA III SSD- Use old connection so speed max.560MB/s read and 550MB/s write
2. M.2 (PCIe) SSD- New onboard connector -> top speed max. 3500MB/s read and 2700MB/s
HFS: Hierarchical File System. HFS is the file system used for organizing files on a Mac hard disk. HFS is a Mac format; Windows PC’s cannot recognize HFS. Windows hard drives -NTFS file systems.
APFS: Apple File System, developed by Apple especially for Macs with SSD to increase their efficiency and speed. This technology has been released in September 2017 with macOS High Sierra.
Water resistance (smartphones):
IP67: The phone is capable of surviving in up to 1 meter of water for around 30 minutes
IP68: The phone is capable of surviving in up to 1.5 meters of water for around 30 minutes
IPX7: Protection against the effects of immersion of device at depths of up to 1 meter of water for 30 minutes. (Apple watch 2)
A virtual assistant is a software agent that can perform tasks or services for an individual.
Different virtual assistants:
Siri: Created by Apple. Launched in September 2011 with the iPhone 4S
Google Assistant: Launched by Google on any new Android phone in May 2016
Alexa: Launched by Amazon in November 2014
Bixby: Created by Samsung. Launched with the Galaxy S8 in May 2017
But some of these virtual assistants are already integrated in multiroom Wi-Fi speakers:
Google Assistant is integrated in Google Home speakers
Alexa is integrated on Amazon Echo
Siri is integrated in the HomePod