APARATO REPETIDOR EN CANAL Y METODO PARA EL SERVICIO DE TRANSMISION DE TELEVISION DIGITAL TERRESTRE.

    公开(公告)号:MXPA05012578A

    公开(公告)日:2007-03-08

    申请号:MXPA05012578

    申请日:2003-12-27

    Abstract: Se describe un repetidor y metodo para un servicio de servicio de difusion de TV digital terrestre de ATSC. El repetidor de canal activo incluye: una unidad de recepcion para recibir una senal de difusion de Radiofrecuencia (FR) desde un trasmisor principal; una unidad de conversion de enlace descendente de frecuencia para convertir la senal de difusion de RF recibida en una senal de frecuencia intermedia (IF); una unidad de desmodulacion para convertir la senal de IF convertida en una senal de banda base; una unidad de ecualizacion para remover una cierta senal innecesaria generada a partir de la senal de banda base convertida; una unidad de modulacion para convertir la senal de banda base en una senal de IF; una unidad de conversion de enlace ascendente de frecuencia para convertir la senal de IF en una senal de difusion de RF; una unidad de amplificacion de alta potencia para amplificar y repetir la senal de difusion de RF convertida; una unidad de transmision para transmitir la senal de difusion de RF producida de la unidad de amplificacion de alta potencia; y una unidad de sincronizacion de senal para generar la primera frecuencia de referencia, y generar la segunda frecuencia de referencia en la base de la primera frecuencia de referencia de manera que la senal de transmision/recepcion se sincronizan por frecuencia y fase.

    TRANSMISOR Y RECEPTOR DE TELEVISION DIGITAL PARA USAR UNA CODIFICACION TRELLIS DE 16 ESTADOS.

    公开(公告)号:MXPA06011267A

    公开(公告)日:2007-01-26

    申请号:MXPA06011267

    申请日:2005-04-01

    Abstract: Se proporcionan un transmisor y un receptor de Television Digital (DTV) de Banda Lateral Residual (VSB) basados en el A/53 del Comite de Sistema de Television Avanzado (ATSC) y un metodo para los mismos. La presente invencion proporciona un transmisor y un receptor DTV de 8-VSB que puede mejorar el funcionamiento de la recepcion del receptor mediante transmitir y recibir flujos dobles formados de datos normales y datos robustos sin incrementar un nivel de energia promedio, sin importar la proporcion de los datos normales y los datos robustos, mediante incluir una unidad de codificacion para realizar la codificacion trellis de 16 estados codificando los datos robustos cuando un flujo de datos incluye datos y un metodo para los mismos.

    APPARATUS AND METHOD FOR RECEIVING DIGITAL TELEVISION SIGNALWITH BACKWARD COMPATIBILITY BYTE

    公开(公告)号:CA2561182A1

    公开(公告)日:2006-01-12

    申请号:CA2561182

    申请日:2005-04-01

    Abstract: Provided are a Vestigial Side Band (VSB) digital television (DTV) receiver based on is A/53 of the Advanced Television System Committee (ATSC) that can secure backward compatibility of a low-ranked DTV receiver by using parity bytes added to robust data for error correction and obtain RS coding gain fr om the robust data, and a method thereof. The DTV receiver includes: a receivin g unit for receiving a transmission signal including general data and robust data and converting the transmission signal into a base-band signal; an equalizer for determining a symbol level of the transmission signal; a trell is decoder for performing trellis decoding on a symbol of the determined level; a nonsystematic Reed Solomon (NRS) decoder for performing NRS decoding on the trellis-decoded robust data and correcting an error; and a restoring unit fo r restoring a digital video data stream with respect to the trellis-decoded general data and the NRS-decoded robust data.

    APPARATUS AND METHOD OF ON-CHANNEL REPEATER

    公开(公告)号:CA2564236A1

    公开(公告)日:2005-11-17

    申请号:CA2564236

    申请日:2004-12-31

    Abstract: Provided are an on-channel repeater and a method thereof. The repeater receives signals on one channel and distributes the signals on the same channel by converting RF signals from a main transmitter into baseband signals; equalizing them in a high-performance equalizer; adding a repeater identifier to them; modulating the baseband signals with the repeater identifier into RF signals. The repeater includes: a receiver for receiving RF signals; a demodulator for demodulating the RF signals into baseband signals ; an equalizer for equalizing the baseband signals; an adder for adding a repeater identifier to the baseband signals; a modulator for modulating the baseband signals with the repeater identifier added in the adder into RF signals; and a transmitter for transmitting the RF signals modulated in the modulator. The technology of the present invention is used to form an on- channel repeating network in an arbitrary transmission system including a digital television broadcasting system.

    Apparatus and method for processing 3d video based on mpeg-4 object descriptor information

    公开(公告)号:AU2003289588A1

    公开(公告)日:2005-06-29

    申请号:AU2003289588

    申请日:2003-12-30

    Abstract: The present invention relates to three-dimensional video processing apparatus and method using MPEG-4 object descriptor information and structures. The three-dimensional video processing apparatus and method that can support a three-dimensional video service smoothly to thereby provide a sense of reality and a cubic effect in an MPEG-4-based system by suggesting a three-dimensional video object descriptor structure and providing to a client an object descriptor, which includes information on kind of three-dimensional video, number of viewpoints, number of media streams and a plurality of display methods; and a method thereof.

    ON-CHANNEL REPEATING APPARATUS AND METHOD FOR TERRESTRIAL DIGITAL TELEVISION BROADCASTING SERVICE

    公开(公告)号:CA2454295A1

    公开(公告)日:2004-11-20

    申请号:CA2454295

    申请日:2003-12-29

    Abstract: A repeater and method for an ATSC terrestrial digital TV broadcasting service. The on-channel repeater includes: a receiving unit for receiving a Radio Frequency (RF) broadcast signal from a main transmitter; a frequency downlink converting unit for converting the received RF broadcast signal into an intermediate frequency (IF) signal; a demodulating unit for converting the converted IF signal into a baseband signal; an equalizing unit for removing noise and multi-path signals generated from the converted baseband signal; a modulating unit for converting the baseband signal into an IF signal; a frequency uplink converting unit for converting the IF signal into a RF broadcast signal; a high power amplifying unit for amplifying and repeating the converted RF broadcast signal; a transmitting unit for transmitting the RF broadcast signal outputted from the high power amplifying unit; and a signal synchronizing unit for generating the first reference frequency, and generating the second reference frequency based on the first reference frequency such that the transmission/reception signal are frequency-and-phase synchronized.

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