Share Wifi

You can turn Windows Phone into a mobile Internet zone if you share via Wi-Fi or Bluetooth data connection of the mobile network. So other devices with Wi-Fi or Bluetooth can use your shared data connection to connect to the Internet.

To share your Wi-Fi data connection from mobile phone network

In the application list, tap Settings Settings icon> Internet Sharing.

Share click for and then click Wi-Fi.

Change Connection Sharing On activation icon.

(Optional) To change the name or password for the broadcast network, tap Edit Edit icon, do one of these actions on the Internet Sharing screen and then tap Done Done icon:

In the Name of emission box, enter a network name. This will be the name of the Wi-Fi network and you will see that others will see and they will use to connect to your shared connection over Wi-Fi from another device.

In the Password box (at least 8 characters), enter a password. This is the password required to connect to your shared connection.

Led Display

This article is dedicated to electronic displays with LED technology. On screens with LED as backlight also see TV or computer monitor.

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An LED display is an output device that displays data or information to the user, which is characterized by being composed of light emitting diodes or ledes, adapted to Spanish and word derived from the acronym LED (Light Emitting Diode).

This type of display should not be confused with LCDs with LED backlight, very currently used in laptops, monitors and TVs. For reasons of business (to appear more modern technology for commercial purposes) LED backlight is presented as a new LCD technology and LED changes in the designation of these devices, without this actually involves a really important technological change.

The display consists of panels or modules ledes (light emitting diodes), whether monochromatic or polychromatic: the latter are formed in turn with RGB ledes (the primary colors of light), or various configurations tailored to the application. These modules together form pixels, which allows to form character, text, images and even video, depending on the complexity of the display and control device.

The most common uses for LED screens are: signs, information, advertising and high-resolution full-color video (concerts, public events, ...), this is due to its high resistance to outdoor, easy manufacturing and maintenance and low consumption.

One problem is resolution LED screens: While on a computer monitor, today, between 1024x768 resolutions are achieved and up to 4096 × 2160 (4K) in a 4x3 meters LED screen is only 192x144 reach physical pixels. To fix this technology known as virtual pixel technology (English Virtual Pixel Technology), which offers greater image resolution on the same physical configuration using some basic geometric concepts developed. There are techniques of virtual pixel: geometric / square and interpolado.1

So, it is available pixels and subpixels integrally formed by green, red and blue ledes getting through the mixture or combination of light elements, more than 16 million colors.

The Digital Audio

The digital audio coding is a digital electrical signal representing a sound wave. It consists of a sequence of integer values ​​and are obtained from two processes: sampling and quantifying the digital electrical signal.


Sampling a digital audio signal.

Sampling involves setting the amplitude of the electrical signal at regular time intervals (sampling rate). To cover the audible spectrum (20 to 20000 Hz) is usually sufficient sampling rates of more than 40000 Hz (CD-Audio standard uses a 10% higher rate in order to contemplate the use of filters not ideal), with 32000 samples per second width similar to the FM radio or a cassette tape, ie band would enable register components up to 15 kHz, approximately.

To play a particular frequency range sampling rate of slightly more than double (Nyquist-Shannon sampling theorem) is needed. For example, in the CD reproducing up to 20 kHz, employ a sampling rate of 44.1 kHz (Nyquist frequency of 22.05 kHz).

The quantification is to convert the level of the fixed sample in the sampling process, typically a voltage level in a finite integer value and predetermined range. For example, linear quantization using a 8 bit linear coding discriminate between signal 256 equidistant levels (28). You can also make non-linear quantification, such as log-quantifiers as mu-law or A-law, which, for example, still using 8 bits operate perceptually as 10 linear bits for low amplitude signals on average, as eg human voice.

The most used form of linear PCM digital audio is the audio CD: 44.1 kHz sampling rate and 16-bit linear quantization (measuring 65536 different signal levels) and, in practice, can record analog signals with components up to 20 kHz and signal-to-noise over 90 dB.

Dual, Quad, Octa, core ...

The processing module is the core of a processor. A dual core, for example, is composed of a CPU 2 processor cores 'physical' mounted on the same package (ie on the same container, namely on the housing where they are inserted the electronic circuits). But because we got to this point? Because the parallelism, compared the increase of the frequency, allows to greatly increase performance, although from a technical point of view the 4 GHz are easily reachable, the disadvantages from the thermal point of view, the high cooling requirements, and l ' huge consumption, are factors to take into account a lot.

But a dual core does not consume more? Although requiring more energy when both cores are under load, the dual core processors will eventually work faster than single core processors and this results in overall consumption that are even smaller than the single core CPU. Also, to save even more, there are techniques that allow to "go to sleep" when one or more cores are not used, or to lower the working frequency in order to reduce the possible demands in terms of energy.

This is not to say that a dual core processor with 2.2 GHz runs at 4.4 GHz, but simply that each core works at a frequency of 2.2 GHz.

But so it is best x64 dual-core processor, 3.2 GHz or a quad core 2 GHz x64? The answer is complicated, we say that depends. For example a certain dual core can have higher performance of a quad core because it works at a higher frequency but at the same time has the higher consumption, but it is not always said, because yes depends on the frequency but also on how these cores are exploited (also if, in principle, they are preferred processors with ever higher frequencies) and use that one should make: to open a word document or to view an e-mail message do not have to buy a quad core from 300 € (if not more). Conversely, if one wants a computer for gaming by playing a video game with all the details at the most, and do not want to compromise, then you need a quad-core processor with latest technology, at least 3 GHz (in addition to a good video card).

But then why are there all these dual-core, quad-core, octa-core ...? Because it is also a question of marketing: the user may think that the fact of having four cores instead of two can be a simple source of pride that leads some people to buy a product based solely on this factor (be it of computer processors, whether it be of processors for smartphones and tablets).

Charles Babbage

Charles Babbage (London, 26 December 1791 [1] - London, 18 October 1871 [1]) was a British mathematician and philosopher, proto-computer scientist who first had the idea of a programmable computer. In the world of computing it is known thanks to its machines: the first, the machine differential, was a prototype imperfect while the second, the Analytical Engine, was only designed.

Parts of the mechanisms of incomplete Babbage are on display at the Science Museum in London. In 1991, working from its original plans, it was completed a machine differential fully functional, assembled following the standards available in the nineteenth century, which means that Babbage's machine would have worked.

Faced with the high number of errors in the calculation of mathematical tables, Babbage decided to find a method by which these could be calculated by a machine, which is not subject to errors, fatigue and boredom that could be imposed on human calculators. This idea came to him as early as 1812. It seems that Babbage was influenced by three factors: aversion to clutter, familiar with log tables and work on calculating machines carried out by Blaise Pascal and Gottfried Leibniz.