Concepts of High Definition Television (HDTV)
October 8, 2008
What is High Definition Television?
A high definition television is a digital television broadcasting system that come with higher resolution compared to the traditional television systems. High Definition Television broadcasts signals digitally, and hence require less bandwidth if the video compression used is sufficient. The term high definition was once used for a series of television systems that were introduced in the year 1930s and 1940s. A HDTV compatible television does not improve the quality of the Standard Definition Television.
LCD TV manufacturers adopt the 16:9 aspect ratio that is compatible for HD Ready 1080p video standard, due to the increasing scale of manufacturing yield and the resolution of the VRAM and VGA that is 768 pixel format. HDTV display images in higher details than the DVD or analog television as it comes with double the linear resolution of SDTV(Standard Definition Television). A high resolution requires higher bandwidth to be transmitted in correct form.
A television or a radio receives signals through various media such as a satellite, cable or air medium and this signal is converted to the form the device is capable of displaying. This is made possible with the digital tuners. A tuner is a device that configures a device, no matter if it is an electronic device, mechanical device or a musical device. Tuners convert low frequency radio frequency signals to a form that is supported by the device. A tuner is also capable of receiving digital broadcasts through the satellite or any other medium and displaying it on the standard definition television or high definition television sets.
Sources of HD Signal Broadcast
HDTV require High Definition signals to display superior quality images. High Definition signals are broadcast by various sources such as:
1.Some internet connections such as Apple TV can broadcast HD signal for video games like Playstation 3 and Xbox 360. Some other services also offer movie trailers, HD movies, clips to download and more.
2.Satellite based TV companies such as Freesat and Sky digital offer HDTV. To receive HD content new satellite dish and New satellite receiver box are required.
3.Blu-ray disc can store up to 10 hours of HD video content based on the encoder settings.
4.HD signals are broadcast over the air and hence can be captured by the antenna. An HD tuner is required to receive this signal. Some HDTV models come with built-in HD tuner and other that do not have this facility would require a HD tuner box, which can be rented from a satellite company or a cable company.
5.Some computer graphics card either have DVI or HDMI interfaces to display images or video to an HDTV.
6.Some DVD-R disc provide 20 to 40 minutes of HD video content.
Parameters of HDTV
Three major parameters of HDTV broadcast systems are Scanning system, Frame rate and Frame size. Scanning system is identified with the letter ‘i’ for interlaced scanning and ‘p’ for progressive scanning. Frame rate is defined as the number of video frames that are produced per second. Frame size is defined as the number of pixels that are formed both horizontally and vertically. For example, 1920 x 1080. Whenever these parameters are used, it may be specified in the form as frame size scanning system frame rate. Frame rate can also specified without a resolution. In the case of a resolution, both the transmitted signal and the native resolution of the TV is considered. HDTV sets upconvert or upscale the transmitted signal to the native format. The video format resolution of high definition display is usually of 720 horizontal lines. The native resolution of HD Ready TV is 1366 x 768 pixels.
Advantages
Images that are formed in HDTV are of better quality as it has more number of lines of resolution. As the gaps between the scan lines are narrower, the images produced are more sharper. Sound track of HDTV video signal is Dolby Digital 5.1 surround sound that produces excellent surround sound capability.
Disadvantages
The best quality of HDTV is not achieved as the operators do not follow HDTV specification properly. They use lower resolutions and broadcast more channels with limited bandwidth. This reduces the quality of the video that is broadcast. Inappropriate cabling is also a factor that puts down the quality of the image. HDMI cables are more expensive than the component cables but provide best picture and sound quality. Though HDTV has some disadvantages one must consider its plus points and deal with this concept accordingly.
Sampo PME-42X6 42″ Plasma TV
June 22, 2008
Large screen size is one of the key reasons for the popularity of the new Sampo PME-42X6 Plasma TV. It has been integrated with a large screen which is 42 inches in size. The screen has come with the capability to display ultra-bright images using the latest plasma display technology. High-definition display is another function of the screen. Anyone can easily install this compact entertainer as it weighs 66.8 pounds.
The unit supports an aspect ratio up to 16:9 and these copies the dimensions of most feature films. It is simple to enhance the brightness of the display up to 500 cd/m2. You can set maximum contrast up to 550:1 to view clear pictures. The clarity of the display mainly depends upon the brightness and contrast ratio. It is possible to produce a maximum of 1,280 pixel resolution horizontally and 1,024 pixels resolution vertically on the screen. The product can display various formats of videos like 1080i, 720p, 480p, 480i HDTV signals etc.
The new model is available with compact dimensions as 40.9 (H) x 3.7 (W) x 25 (D) inches. Maximum ability of Sampo PME-42X6 42″ Plasma Television to pitch pixel has been measured as 1.08 mm. Two ports are featured for connectivity needs namely USB and RS-232. The following are available interfaces in the product namely:
- DVI input (DVI 24-pin)
- RGB inputs and outputs (D-Sub 15-pin)
- Composite inputs
- Component inputs
- S-video inputs
- Detachable 181-channel NTSC tuner
| General Information | |
|---|---|
| Brand | Sampo |
| Model | Sampo PME -42X6 |
| Weight | 66.8 pounds |
| Dimensions | 40.9 x 27.1 x 14.7 |
| Screen Size in inches | 42 |
| Resolution | 1,280 x 1,024 |
| Brightness | 500 cd/m2 |
| Features | |
| Remote control | Yes |
| AV inputs | Yes |
| S-Video | Yes |
| Component video connection | Yes |
| Progressive scan | No |
Samsung PPM42M6HSX Plasma TV
January 9, 2008
Which Plasma TV has 42” wide screen, PC interface of DVI and VGA (HD-15), weighs 34.5 kilograms and has the dimensions of (H) 63.1 cm x (W) 103 cm x (D) 9.7 cm? The Samsung PPM42M6HSX Plasma TV has all these features and is without doubt the most charming Plasma TV in vogue and the cute duck-feet like stand gives it an elegant appearance!
The product has a 42” wide screen, and an image aspect ratio of 16:9, to give the maximum clarity for pictures broadcasted. Progressive scan permits easy access to different channels, while the backlight life of 60,000 hours with display format at 720p, and features Digital Natural image engine with a resolution of 1024 x 768, are features bringing out the best in technology.
The audio system of this Samsung PPM42M6HSX Plasma TV has output power totalling to 20 watts, sound effects of SRS TruSurround XT and stereo sound output mode. The clarity of sound emitted is crystal clear, be it music, dialogues or documentaries. The operational power consumed is 330 Watts, and for the internal power device, the voltage required is AC 120/230 Volts. While the energy consumed is minimal, the sound and image created are of excellent quality.
Remote control has infrared technology to enhance the controlling effects from the distance required. Multi channel preview with Picture in Picture and Freeze memo possible in the video mode, this Samsung PPM42M6HSX Plasma TV assures 100% guarantee for the quality. A product from the Samsung series can be purchased blindfolded as it has beauty and intelligent features combined to satisfy the rising consumer needs, the world over.
Samsung PS42S4S Plasma TV
January 5, 2008
Here comes the leader, the winner, and the plasma TV with black and silver combination for the sleek and beautiful looks. The Samsung PS42S4S Plasma
TV comes with 42” screen and 30-Watts speaker power. Aspect ratio of 16:9, brightness of 1000 cd per metre squared and high contrast ratio of 3000:1 ensures great clarity of pictures and sound to ward off the disturbing thoughts often plaguing one in this hectic world.
Features in Detail
• Resolution supported by the television screen is 852 x 480 pixels, while the pixel pitch is 1.11 mm, and the frequency of 50 Hz ensures perfect quality one expects from Samsung team.
• The two tuners, equipped within helps to tune the required channel with ease. Tuner type is PAL and SECAM.
• Audio type is SRS TruSurround XT and Nicam Digital stereo, which gives the clarity that one requires to perk up the senses, and the total speaker power of 30 Watts gives extra bang one requires when listening eagerly.
• Video interface are component, Composite, S-video and SCART while the PC interface are DVI and VGA (HD-15) with teletext functions to co-ordinate sound and images perfectly.
• While the Picture in Picture are supported with AV input/output Scart with three numbers, the auto tuning and sleep timer are added features for the satisfaction of the much valued customers who trust the lineage of Samsung PS42S4S Plasma TV.
Plasma TVs are trusted for its high performance and quality pictures. With space restraints affecting every corner of the world, these models can save space area as wall mounting is easily done. The company has decades of trust and back up is guaranteed, the valuable customers, thousands of them vouch for it, be it East or West North or south, globally.
Pioneer PDP43MXE1S Plasma TV Review
December 16, 2007
If you want to have an elegant television with impressive outlook and effective functionalities, it is better to make try on the new arrival Pioneer PDP43MXE1S Plasma TV. As the name defines, the unit functions with the support of plasma display technology. Manufacturer has introduced an innovative feature called ‘auto setup’ in this device.
Users can make minute changes in the colour settings accordingly. The device has been availed in the market with ‘energy save’ mode which allows you to save power utilization. You can view ‘On Screen Display’ in different type of languages. Make use of layered key lock for your protection. If you need, you can use LED OFF mode. The manufacturer has innovatively featured smart cooling system which keeps your unit without heat.
It is simple to set time to manage screen with the help of ‘Screen Management Timer’. Integrator menu is availed with this home entertainer. Split screen facility can be utilized while the need comes. Pioneer PDP43MXE1S Plasma TV can offer eye catchy colour images within 43 inches screen. Enhanced definition monitor is embedded with the product. There are 2 PC interfaces namely DVI and VGA.
Plasma technology offers your progressive scanning facility, 16:9 aspect ratio, 1200:1 contrast ratio, PIP and POP option. You can choose stereo output mode for enjoying natural sound effects. Infrared featured remote control has featured and users have to supply up to 230 volts power. Panasonic has manufactured the smart entertainer with the measurements like 107 cm width, 9.8 cm depth and 63 cm height. Though it includes light weight components, the weight of the television comes around 33 kilo grams.
