76 results about "Digital tv broadcasting" patented technology

Device and method for real time monitoring, and providing of useful progr am specific information (PSI) of a program received from a digital TV broadcasting system to a watcher, wherein, when broadcasting program PSI is changed, the change of th e PSI is detected by monitoring a PMT in a PSIP, and facts of the change or addition of additional functions for a program following the change or addition of the PSI of the digital broadcasting program is reflected and informed to a watcher.

A mobile terminal capable of breaking a phase-noise signal caused by a high power transmission signal of a mobile phone such as GSM when receiving digital TV broadcasting such as DVB-H and a method of reducing interfering phase-noise in the mobile terminal. The mobile terminal includes a first RF transmitter / receiver; a first signal coupler; a phase-noise filter; a phase shifter; a VGA amplifier; and a signal combiner.

When a channel of a digital TV broadcasting is selected, a direction information of the channel, which is stored in a channel setting table, is set in a smart antenna and then, in a case of a signal absence state of a broadcasting signal or when a reduction of receiving signal intensity is detected, an optimal directivity direction, in which the broadcasting signal is reproducible and the receiving state of the wave is optimal, is determined by switching (scanning) the directivity direction of the smart antenna. And, the determined directivity direction is stored in the channel setting table as the direction information of a current channel and the directivity direction is set in the smart antenna.

A relay station and method for ATSC terrestrial digital television broadcasting services are disclosed. The co-channel relay station includes: a receiving unit for receiving radio frequency (RF) broadcast signals from the main transmitter; a frequency downlink conversion unit for converting received RF broadcast signals into intermediate frequency (IF) signals; a demodulation unit , used to convert the converted intermediate frequency signal into a baseband signal; an equalization unit, used to remove noise and multipath signals generated from the converted baseband signal; a modulation unit, used to convert the baseband signal into an intermediate frequency signal; frequency uplink The channel conversion unit is used to convert the intermediate frequency signal into a radio frequency broadcast signal; the high-power amplifying unit is used to amplify and relay the converted radio frequency broadcast signal; the transmitting unit is used to transmit the radio frequency broadcast signal output from the high-power amplifying unit and a signal synchronization unit that generates a first reference frequency, and generates a second reference frequency based on the first reference frequency so that the transmit / receive signal is frequency and phase synchronized.

Provided is a modulation apparatus that can reduce time delay of on-channel repeaters in a terrestrial digital television broadcasting system. The time delay is caused by a filter during the modulation operation in the on-channel repeaters. The modulation apparatus of the present research includes: a baseband signal forming unit for forming a baseband signal by combining the output signals of an equalization unit with the pre-defined field / segment synchronization signals in the on-channel repeaters; a pilot inserting unit for inserting a pilot signal to the baseband signal; an up-sampling unit for up-sampling the baseband signal with the pilot signal; a VSB filtering unit for filtering the up-sampled baseband signal based on a Window technique and / or an Equi-Ripple filter to thereby form an in-phase (I) signal and a quadrature (Q) signal; an up-converting unit for up-converting the frequencies of the filtered I and Q signals to frequencies of an intermediate frequency (IF) band; an adding unit for adding the up-converted I and Q signals and converting a resultant signal into a digital VSB signal of the IF band; and a digital-to-analogue converting unit for converting the digital signal of the IF band to an analogue signal.