The TV phone is a mobile phone that has the ability to receive TV signal and display the same on the screen. The TV phone receives the signal band allocated for the mobile phone as well as the signal band allocated for the TV. It has the required electronic circuitry which extracts video and audio signals from incoming radio signal and modulates the same to match the ability of a home TV. Television data are received either from a proprietary or a cellular network.
South Korea had launched the first television phone in 2002 using the standard mobile network. It was more of a slide show than a smooth video streaming. Visual data require far wider space. Vodafone and Samsung made TV phones that received analog broadcast. The streaming was better but choppy.
Video streaming required a faster transmission speed. This became possible with the introduction of 2G. It brought the delivery speed to 14 kilobyte per second. 2.5 G increased the speed to 100 kilobyte per second. It was only when faster 3G became a reality that a normal TV display became possible. Further improvement required a broader bandwidth. 3G multicasting allowed several subscribers to access the same broadcast simultaneously. It saved a lot of bandwidth.
Time slicing or in simpler words, transmission of data in predetermined space intervals quickened the data receipt. Finally, a stronger battery provided the much needed longer viewing time.
Some of the latest TV phones have a 2.4 inch 16 mega pixel color display. They cover a wide range of GSM frequencies. These phones have a heavy duty battery. They deliver more than 300 minutes of talk time.
One can get branded phones in between 300 to 400 USD range. Chinese manufacturers and distributors have introduced such phones with similar specifications at a far lower price. The market is rife with wide varieties of phones. The technology is also rapidly advancing. It has reduced the shelf life of electronic goods. You have to be judicious in selecting an appropriate gadget at the right price.
One can have an online preview for making a preliminary judgment. Sometimes experience shared by friends also helps in making a decision. The fact in favor of low priced products could be that manufacturers would like to remain and prosper in the existing global market. As such, quality has to be improved. Marketing management can never be a hit and run affair. As such, they shall strive hard to assert reliability by generating quality products.
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