Abstract:
A stereoscopic data processing method and apparatus to provide service of stereoscopic data interoperating with digital multimedia broadcasting (DMB) is provided. The stereoscopic data processing method, including: receiving a transmission stream (TS) including a program map table from an external device; recognizing stereoscopic program information descriptor in the program map table; and recognizing defined bit values in the stereoscopic program information descriptor and processing data.
Abstract:
A repeater having different input and output frequencies converts a signal received with the input frequency to a first intermediate frequency signal based on a local oscillating frequency for intermediate frequency conversion, and converts the first intermediate frequency signal to a second intermediate frequency signal by performing digital processing on the first intermediate frequency signal. Then, the repeater generates a first frequency tone signal that corresponds to a difference between the input and output frequencies, and generates a second frequency tone signal from the local oscillating frequency for intermediate frequency conversion and the first frequency tone signal. The repeater up-converts the second intermediate frequency signal to the output frequency based on the second frequency tone signal, and transmits the signal.
Abstract:
The present invention relates to an on-channel repeating apparatus and method. An embodiment of the present invention provides an on-channel repeating method including: subtracting a replica of a feedback signal from a signal received from a main transmitter or another repeating apparatus; demodulating and equalizing the signal to remove noise, a multipath signal, and the remaining feedback signal from the signal; inserting identification signal having good correlation properties into the signal; modulating the signal; and transmitting the modulated signal. Another embodiment of the present invention provides an on-channel repeating apparatus including: a unit that converts signals received from a main transmitter or another repeating apparatus into signals in a predetermined band; a unit that generates identification signals having good correlation properties; a unit that generates a replica from the signals in the predetermined band and the identification signal, and then removes a feedback signal; a unit that demodulates a signal from which the feedback signal is removed; a unit that equalizes the demodulated signal to remove noise, a multipath signal, and the remaining feedback signal therefrom; a unit that inserts the identification signal into the equalized signal; and a unit that modulates the signal having the identification signal inserted thereinto and transmits the modulated signal. According to the present invention, the repeating apparatus repeats output signals that have a small time delay and whose distortion is corrected. Therefore, it is possible to improve the utilization of limited frequency sources, and reduce investment in achieving a repeating apparatus.
Abstract:
In order to achieve synchronization of ensemble transport interface (ETI) signals of a first network and a second network, a synchronization device receives a first ETI signal from the first network and a second ETI signal from the second network, generates delay times between the same frames, compares frames of the first ETI signal and frames of the second ETI signal, and then synchronizes the first ETI signal and the second ETI signal according to the delay time.
Abstract:
In a terrestrial DMB, a transmitting apparatus multiplexes a plurality of service streams generated for any service to a plurality of ensembles. In this case, the same sending time data is constructed in a time stamp field of each frame for each of a plurality of ensembles. With this configuration, a plurality of transmitting apparatuses can send a plurality of transmission frames including service streams for the same service at the same point of time, and thus receiving apparatuses can actually receive a plurality of transmission frames at the same point of time.
Abstract:
In a method of transmitting broadcasting signals, a transmission frame has the same configuration as that of the existing terrestrial DMB signal. A transmission frame including a base layer service stream is modulated to a base layer, and a transmission frame including an enhancement layer service stream is modulated to an enhancement layer. The enhancement layer service stream is composed of additional data that is not included in the base layer service stream, in order to provide an enhancement layer service. In this way, the method can provide a high-quality service requiring high transmission efficiency while being compatible with the existing terrestrial DMB system. The high transmission efficiency means a higher data transfer rate than that of the existing terrestrial DMB system.
Abstract:
The present invention relates to a multimedia broadcast signal transmitting/receiving method, and it generates a pilot signal by mapping transmission information on an orthogonal code, disperses the pilot signal in the frequency domain, modulates the dispersed pilot signal, and transmits the modulated pilot signal.
Abstract:
A phase detection method for carrier synchronization in a high order Quadrature Amplitude Modulation (QAM), the phase detection method including: compensating a signal received in a carrier recovery loop into compensated signal, the compensated signal being compensated through a predetermined process; determining reference decision symbol on the compensated signal; calculating weight on the compensated signal; calculating phase error using the compensated signal and reference decision symbol; and calculating and outputting weighted phase error using the weight and phase error.
Abstract:
In a digital broadcasting signal transmission system, a transmission frame includes a frame body and a frame header, and the frame body is divided into a plurality of sub-bands in the frequency domain and is divided into a plurality of symbols in the time domain. The frame header is provided in the former part of the transmission frame and is transmitted with a signal in the time domain. The frame body includes a plurality of services, and the services respectively receive at least one sub-band and at least one symbol. The frame header includes information on the plurality of services, and information on the plurality of services includes information on the sub-band and the symbol to which the services are allocated, information on channel encoding levels of the services, and information on digital modulation levels of the services.
Abstract:
The present invention relates to a method of generating contents information for managing contents including stereoscopic contents being two-dimensional contents and three dimensional contents, and an apparatus for managing contents, the method including the steps of, when there is a scene change of contents, adding a second field including information on each of a plurality of scenes corresponding to a plurality of types, respectively, to the contents information.