Pure English Blog

Wow! Samsung has now one another thing to boast about for its new 50-inch model dubbed the SPD-50P91FHD. The new PAVV Cannes plasma TV has been blessed with the 802.11n capability for a range up to 300 feet. Yes, this is the very first Bluetooth-certified plasma from the house of Samsung.

What really matters to me is that it sports full high resolution 1080p format and touts “True Black Panel” for better full HD image and “Cinema Screen” mode. Exclusively meant for the Korean market, the SPD-50P91FHD is priced at 4,300,000 won (approx. $4,640).

An analog electronic signal is created by the continuous modulation of some property of the current or wave. For example, in an analog sound recording, the frequency of a pure tone striking a microphone creates a corresponding pulse in the amperage passing through it. An increase in the volume of the sound causes the fluctuation of current to increase while keeping the same rhythm.
The primary disadvantage of analog signalling is that any electrical system has noise in it–that is, random variations. As a signal is copied and re-copied, or transmitted over long distances, these random variations become dominant.

You may want network switch or telephone switch.

A switch is a device for making or breaking an electric circuit. usually it has two pieces of metal that touch to make a circuit, and separate to break the circuit. The pieces are always selected to have minimal corrosion, because most metals form insulating oxides that would prevent the switch from working. One way is to have noble metals. Abother way is to arrange the metal pieces so that they wipe each other off. A final way is to use nonmetallic conductors, such as conductive plastic.

One of the most reliable forms of switch is the mercury switch. The advantage is that the liquid metal mercury flows around obstacles.

Ring modulation is a way of combining audio signals. Ring modulation works by multiplying two signals, where one is typically a sine-wave. Interesting harmonics can be generated by carefully selecting and changing the frequency of the two input waveforms.

On the C64 SID chip, ring modulation multiplies a triangle wave with a square wave.

A ring modulator was a common feature on early modular Moog synthesizers. The ring modulator went out of fashion with the advent of all-in-one synthesizers, but has returned as a feature in digital modelling and software synthesizers.

RF Modulator (or Radio Frequency modulator) is a small device that takes an input signal and outputs radio frequency encoded signals.

Most commonly these are found in home computers, or games systems that display graphics on a television receiver. The RF Modulator takes the internal RGB, YUV, or Composite video signal from a video-circuit inside the machine and generates a PAL or NTSC broadcast signal that can be fed into the television aerial socket.

These give a relatively poor picture; some of the image quality is lost during the modulation in the source device, and some is lost again when demodulated in the television. Some televisions provide a scart or composite input, so that compatible devices can bypass this problem.

Source: https://catvbroadcast.com/about-us/

DVB-S2 is a newer specification of the DVB-S standard. Designers claim that DVB-S2 performance gains over DVB-S is circa 30%. Unlike DVB-S, it does not rely on MPEG2 encoding, but H.264 (MPEG4).
Main features:
DVB-S2 combines DVB-S (intented for final consumers ) with DVB-DSNG (used by professionals),
Adaptative coding to optimize the use of satellite transponders.
4 modulation modes are available : QPSC,8PKS (used in non-linear transponders near to saturation); 16APKS and 16APKS (for professional, semi-linear aplicatons).
Improved rolloff: &alpha=0.20 & &alpha=0.25 in adition to the DVB-S &alpha 0.35
Error correction: DVB-S2 uses a FEC system based on concatenation of the Bose-Chaudhuri-Hocquenghem with a Low parity Check. Performance should be 0.7dB close to the Shannon limit.
Cheap to implement.

NAT is a common technique often used to allow multiple computers to transparently (mostly) share an internet connection. When the computer performing the NAT (often known as a NAT box, name explained later) routes the systems behind it onto the internet, it transparently changes the source IP address of the internal system to it’s external (Internet) address and remembers basic data about the connection. The packet then traverses the internet to it’s destination as if it had been generated by the “NAT box” itself. When the reply is sent back, the “NAT box” looks at the connection tracking data it stored before and determines where to send it back on the internal network. To the computers on the local network, the “NAT box” looks like just another router hop, but in reality, it is doing all sorts of magic.

The term “NAT box” stems from the functionality is has, that being NAT. In NAT, or Network Address Translation, the network address is being translated at the router. This is what creates the illusion of only using 1 IP.

The benefits of NAT are great. It allows many computers to access the internet utilizing only a single IP address on the internet. This not only saves money for the organization employing NAT, but also conserves addresses on the internet as few are still avaialble.

If you are the kind of individual who loves streaming videos by connecting it to your Plasma TV or your laptop, then I have good news for you. Monsoon has come up with HAVA Gold and Platinum HD media hubs, which does exactly that.

Although, many people are seeing these devices as a substitute for Slingbox but this is certainly not the case because these media hubs contain a unique multicast system, which has ability to stream DVD-quality videos in MPEG-2 form. Whats more, you can share video to multiple locations without diminishing the quality of the image.

To give you the top-notch quality, online video is streamed with the assistance of MPEG-4. The best part about these media hubs is that they can accept number of inputs at once. Talking about price, you can get the Gold version for around $130 while the price of the platinum version is $160.