Lg Electronics Inc.

Jung Sig Jun

Kook Yeon Kwak

Tok Kim

Sang Chul Moon

Woo Suk Ko

Hee B Park

Jong Woong Shin

The present description discloses a method and apparatus for displaying images. An image display method according to one embodiment of the present invention comprises the following steps: generating, from an inputted source, 3D image data to be outputted; taking, as an input, first information on whether or not there are a plurality of viewers, and, in the event there are a plurality of viewers, on the number of viewers, and second information on the viewing mode of each viewer based on the first information; generating individual synchronization information for the generated 3D image data in response to the viewing mode of each viewer in accordance with the inputted first information and second information; and outputting the generated 3D image data via a screen, and transmitting the generated synchronization information to the 3D eyeglasses of each viewer. In addition, an image display method according to another embodiment of the present invention comprises the following steps: generating, from an inputted source, 3D image data to be outputted and first synchronization information; outputting the generated 3D image data via a screen, and transmitting the generated first synchronization information to each viewer; generating second synchronization information on the basis of the generated first synchronization information in accordance with a received viewing mode switch request; and transmitting the generated second synchronization information to the 3D glasses of the corresponding viewer.

Method and apparatus for controlling image display so that viewers selectively view a 2D or a 3D service

A tuner included in a digital broadcast receiver tunes a broadcast signal from a transmitter via a re-transmitter. A demodulator demodulates the broadcast signal, and an identification information detector detects identification information of a re-transmission service provided by the re-transmitter from the demodulated broadcast signal. A decoder arranged to decode the modulated broadcast signal, and a controller controls operation of the decoder based upon the identification information detected by the identification information detector. The identification information of the re-transmitter may directly include information identifying a type of the re-transmission service (e.g., a free or charged service) or may include a unique ID number of the re-transmission service, which could be used by the broadcast receiver to determine service type.

Broadcast signal and receiver and method of decoding digital broadcast signal

A device and method for a symbol recovery in a digital television are disclosed. The device includes a symbol clock recovery device includes a remained phase error remover operating a digital baseband real/imaginary number component signals, and removing remained phase error, a timing error detector nonlinearly operating the real/imaginary number component signals having the remained phase error removed, and detecting symbol clock phase error information therefrom, and an oscillating part generating a symbol clock frequency compensated to at least two times from the detected symbol clock phase error information and outputting the compensated frequency.

Device and method for symbol clock recovery in digital television

A carrier recovery device of a digital TV receiver is disclosed, which can stand a multiple path noise. In the carrier recovery device, it is possible to recover a carrier with a phase error component of the carrier existing on data blocks as well as a carrier signal, whereby it has the carrier recovery function even in case a carrier recovery unit is not operated properly.

Carrier recovery device of digital TV receiver

Device for recovering a carrier including a first mixer for multiplying passband I, and Q signals and a first complex carrier to produce baseband I, Q signals, a filter part for providing pilot components of the baseband I, and Q signals only, a first phase error detector for receiving the pilot component to produce first phase error information, a second mixer for multiplying the passband I, Q signals and a second complex carrier, a second phase error detector for multiplying a difference of samples from the second mixer at first and second time points and a sample at a middle time point of the two samples for producing second phase error information, a loop filter for receiving first and second phase error information and selectively forwarding one of the first and second phase error information, and first, and second oscillators for producing the first and second complex carriers in proportion to an output of the loop filter, and providing to the first and second mixers respectively, thereby minimizing PLL residual jitter characteristics after FPLL convergence.

Device for recovering carrier

An apparatus for recovering a carrier is disclosed, for recovering a carrier correctly even though ghost exists in a signal received in a television, which includes a signal converter outputting baseband I, Q signals by multiplying digitized passband I, Q signals by a complex carrier according to a phase error; first and second filters removing data components of the baseband I, Q signals; a divider dividing a signal outputted from the second filter by a signal outputted from the first filter; a multiplier multiplying a signal outputted from the divider by the baseband I signal delayed for a predetermined time period; and an oscillator generating a complex carrier according to a signal outputted from the multiplier.

Apparatus for recovering carrier

A digital TV receiver includes an A/D converter for converting an analog signal into a digital signal, a carrier recovery for converting the digital passband signal into a digital baseband signal, and a symbol clock recovery for converting digital baseband real/imaginary component signals into OQAM type of real/imaginary component signals, detecting timing error information by high-passband-filtering, squaring, and adding the OQAM real/imaginary signals, and for generating and outputting the at least two times the frequency of the symbol clock corrected from the detected timing error information.

Digital TV receiver

A device of digital TV receiver including an A/D converter for converting an analog signal into a digital passband signal, a carrier recovery for converting the digital passband signal into a digital baseband signal, and a symbol clock recovery for calculating the digital passband real/imaginary signals of the A/D converter or the digital baseband real/imaginary signals of the carrier recovery, detecting timing error information, and generating and outputting two times the frequency of the symbol clock recovered from the detected timing error information is disclosed.

A digital TV receiver includes an A/D converter converting an analog signal into a digital signal, a carrier recovery converting the digital pass-band signal into a digital base-band signal, and a symbol clock recovery converting digital real/imaginary base-band component signals into OQAM type of real/imaginary component signals, detecting timing error information by performing high pass-band filtering on the OQAM real/imaginary signals, and squaring and adding the filtered value, and for generating and outputting at least two times the frequency of the symbol clock corrected from the detected timing error information.

A device of digital TV receiver includes an A/D converter for converting an analog passband signal into a digital passband signal, a carrier recovery for converting the digital passband signal into a digital baseband signal, and a symbol clock recovery for calculating the digital passband real/imaginary signals of the A/D converter or the digital baseband real/imaginary signals of the carrier recovery and squaring the calculated result, detecting timing error information, and generating and outputting two times the frequency of a symbol clock recovered from the detected timing error information.

A symbol recovery system for a digital VSB signal finds sync pattern correlations in the incoming signal. The present symbol sync acquisition circuit also accounts for static which distort the signal during transmission. Initially, both positive and negative sync pattern correlations are accorded equal weight, with the non sync pattern correlations being accorded a negative weight. Values are accumulated in a segment integrator and stored in a FIFO having a location for each symbol position in a segment. A comparator initially produces an output when sync pattern correlations are found that add to a given value. After a relatively small number of correlations, as tabulated in a confidence counter, a VCO is enabled to change its frequency under control of error pulses based upon the symbol sync. After a greater number of sync pattern correlations, the symbol position in the segment is fixed, sliding to a new symbol location in the FIFO is precluded, the signal polarity is determined and changed if necessary, and a higher threshold is established for the comparator.

Signal recovery system

The present invention discloses a device and method for generating an auto gain control signal. When a gain of an input signal is very different from a wanted gain, an increase of an integral value is prevented by repeatedly resetting an integrator. Especially, the device can sensitively respond to a fast moving substance on a channel, by reducing a repeated reset period of the integrator. At the same time, it is possible to minimize reduction of the performance of a receiver due to a residual jitter generated by the shortened period. As a result, the receiver has an improved performance in regard to the gain variations of the whole channels.

Method and apparatus for generating auto gain control signal having information storing feature

A timing recovery device in a digital television receiver using a VSB system is disclosed. In the present invention, the timing recovery device independently determines whether the detected hsync signal is reliable and operates if the detected hsync signal is reliable.

Timing recovery device of digital TV

A method and system for detecting a VSB mode in a digital TV receiver is disclosed. The system includes first and second VSB mode detectors implemented before and after a channel equalizer. The first VSB mode detector detects a VSB mode from a signal before channel-equalization, the second VSB mode detector detects a VSB mode from a channel-equalized signal, and one of the detected VSB modes is output to the channel equalizer as the finally detected VSB mode.

Vestigial sideband mode detection apparatus in digital television receiver

An apparatus for judging if a co-channel interference exists in a digital TV receiver is disclosed. The TV receiver includes a comb filter for removing NTSC interference of input data, and a selector for selectively outputting data which passed through the comb filter or data which did not pass through the comb filter according to a selection signal. The apparatus includes a gain controller for controlling the gain of noise which did not pass through the comb filter to change the point of time for turning on/off the comb filter, thereby optimizing the performance of the TV receiver for the channel noise and NTSC co-channel interference.

Growing community of inventors

Seongnam-si, South Korea

Jung Sig Jun