Patent ID: 7748025
Filing Date: 2010-06-29
Classification: H04N

Abstract:
1. A digital television receiver adapted for use with a first power source and a second power source, comprising: a tuner unit adapted for receiving a digital television signal; a decoding unit for decompressing the digital television signal; and a level-shifting device electrically interconnecting said tuner unit and said decoding unit, said level-shifting device including an electronic card connector adapted to be electrically connected to the first power source and the second power source, adapted for insertion of an electronic card, and operable to provide a power signal of one of the first and second power sources to the electronic card according to a requirement of the electronic card, a first level-shifting unit electrically connected between said tuner unit and said electronic card connector, adapted to receive a predetermined power signal, and operable for shifting a signal level of a digital television output signal of said tuner unit and for providing a level-shifted output to the electronic card via said electronic card connector when the power signal provided by said electronic card connector to the electronic card inserted therein does not match the predetermined power signal, a second level-shifting unit electrically connected between said decoding unit and said electronic card connector, adapted to receive the predetermined power signal, and operable for shifting a signal level of a digital television output signal of the electronic card from said electronic card connector and for providing a level-shifted output to said decoding unit when the power signal provided by said electronic card connector to the electronic card inserted therein does not match the predetermined power signal, and a third level-shifting unit electrically connected between said decoding unit and said electronic card connector, adapted to receive the predetermined power signal, and operable for shifting a signal level of a control command exchanged between the electronic card and said decoding unit via said electronic card connector and said third level-shifting unit and for providing a level-shifted output to a destined one of the electronic card and said decoding unit via said electronic card connector when the power signal provided by said electronic card connector to the electronic card inserted therein does not match the predetermined power signal.