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    COMMUNICATION SYSTEM
    53.
    发明专利
    COMMUNICATION SYSTEM 未知

    公开(公告)号：CA2652487C

    公开(公告)日：2009-08-11

    申请号：CA2652487

    申请日：1994-03-25

    Applicant: PANASONIC CORP

    Inventor： OSHIMA MITSUAKI

    IPC: H04B1/68 ,  H03M13/25 ,  H04L1/00 ,  H04L1/22 ,  H04L5/00 ,  H04L27/00 ,  H04L27/02 ,  H04L27/04 ,  H04L27/18 ,  H04L27/26 ,  H04L27/34 ,  H04L27/38 ,  H04N5/44 ,  H04N7/015 ,  H04N7/24 ,  H04N7/26 ,  H04N7/50 ,  H04N19/89

    Abstract: At the transmitter side, carrier waves are modulated according to an input signal for producing relevant signal points in a signal space diagram. The input signal is divided into, two, first and second, data streams. The signal points are divided into signal point groups to which data of the first data stream are assigned. Also, data of the second data stream are assigned to the signal points of each signal point group. A difference in the transmission error rate between first and second data streams is developed by shifting the signal points to other positions in the space diagram expressed at least in the polar coordinate system. At the receiver side, the first and/or second data streams can be reconstructed from a received signal. In TV broadcast service, a TV signal is divided by a transmitter into, low and high, frequency band components which are designated as a first and a second data streams respectively. Upon receiving the TV signal, a receiver can reproduce only the low frequency band component or both the low and high frequency band components, depending on its capability. Furthermore, a communication system based on an OFDM system is utilized for data transmission of a plurality of subchannels, wherein the subchannels are differentiated by changing the length of a guard time slot or a carrier wave interval of a symbol transmission time slot, or changing the transmission electric power of the carrier.

    55.
    发明专利
    未知

    公开(公告)号：DE60041608D1

    公开(公告)日：2009-04-02

    申请号：DE60041608

    申请日：2000-07-13

    Applicant: PANASONIC CORP

    Inventor： IRIE HIROAKI ,  NISHIUCHI KENICHI ,  HORAI KEIICHIRO ,  OSHIMA MITSUAKI

    IPC: G11B7/007 ,  G11B7/0045 ,  G11B7/125 ,  G11B7/24 ,  G11B7/26 ,  G11B19/12 ,  G11B20/00 ,  G11B20/12 ,  G11B20/18

    Abstract: A main information area 31 capable of recording an information signal and a subsidiary information area 32 for recording subsidiary information that is different from the information signal are divided in one principal plane direction of a substrate, and an information layer for recording the information signal in the main information area 31 is provided also in the subsidiary information area 32, and medium identification information for distinguishing the medium optically is recorded in the information layer of the subsidiary information area 32 without changing the shape of the information layer. As a result, the medium identification information can be recorded in an optical recording medium 1 stably. In particular, the initialization of a phase change type optical recording medium and the recording of the medium identification information can be performed at the same time, so that the production process can be simplified, and the production costs can be reduced.

    SISTEMA DE COMUNICACIONES.
    56.
    发明专利
    SISTEMA DE COMUNICACIONES. 未知

    公开(公告)号：MXPA03010764A

    公开(公告)日：2009-01-14

    申请号：MXPA03010764

    申请日：2003-11-25

    Applicant: PANASONIC CORP

    Inventor： OSHIMA MITSUAKI

    IPC: H04N5/40 ,  G11B20/10 ,  H03M13/00 ,  H04B1/68 ,  H04B7/17 ,  H04B7/204 ,  H04B7/216 ,  H04B7/26 ,  H04B14/04 ,  H04J11/00 ,  H04L1/00 ,  H04L1/22 ,  H04L5/00 ,  H04L5/06 ,  H04L27/00 ,  H04L27/02 ,  H04L27/04 ,  H04L27/18 ,  H04L27/22 ,  H04L27/26 ,  H04L27/34 ,  H04L27/36 ,  H04L27/38 ,  H04N5/44 ,  H04N5/455 ,  H04N5/46 ,  H04N5/765 ,  H04N5/7826 ,  H04N7/015 ,  H04N7/08 ,  H04N7/081 ,  H04N7/12 ,  H04N7/20 ,  H04N7/24 ,  H04N19/89 ,  H04N21/2383 ,  H04N21/438 ,  H04N21/647

    Abstract: En el lado transmisor, las ondas portadoras se modulan de acuerdo con una señal de entrada para producir los puntos de la señal aplicables en un diagrama de espacio de la señal. La señal de entrada se divide en dos flujos de datos, el primer y el segundo. Los puntos de la señal se dividen en grupos de puntos de señal al cual se asignan los datos del primer flujo de datos. Además, los datos del segundo flujo de datos se asignan a los puntos de la señal de cada grupo de puntos de señal. Se desarrolla una diferencia en proporción de errores de transmisión entre el primer y segundo flujo de datos, mediante el desplazamiento de los puntos de la señal a otras posiciones en el diagrama de espacio expresado por lo menos en el sistema de coordenadas polares. En el lao receptor, el primer y/o segundo flujo de datos puede reconstruirse de la señal recibida. En el servicio de transmisión de televisión, una señal de televisión se divide por el transmisor en componentes de banda de baja y alta frecuencia que se designan, respectivamente, como primer y segundo flujo de datos. Al recibir la señal de televisión, el receptor puede reproducir solamente el componente de banda de frecuencia baja o los componentes de banda de frecuencia baja y alta, dependiendo de su capacidad. Además, un sistema de comunicaciones basado en un sistema de OFDM se utiliza para la transmisión de una pluralidad de subcanales, donde los subcanales se distinguen al cambiar la longitud del segmento de tiempo de guarda o el intervalo de una onda portadora de un segmento de tiempo de transmisión de símbolos, o cambiando la energía eléctrica de transmisión al portador.

    COMMUNICATION SYSTEM
    57.
    发明专利
    COMMUNICATION SYSTEM 未知

    公开(公告)号：HK1103321A1

    公开(公告)日：2007-12-14

    申请号：HK07107280

    申请日：2007-07-06

    Applicant: PANASONIC CORP

    Inventor： OSHIMA MITSUAKI

    IPC: H04B20060101 ,  H04B1/68 ,  H04L20060101 ,  H04L1/00 ,  H04L1/22 ,  H04L5/00 ,  H04L27/02 ,  H04L27/04 ,  H04L27/18 ,  H04L27/26 ,  H04L27/34 ,  H04L27/38 ,  H04N5/44 ,  H04N7/015 ,  H04N7/24 ,  H04N7/26 ,  H04N19/89

    Abstract: In the transmitter side, data are divided into two or more groups, according to importance. In a three groups system, for example, the data streams are then mapped onto a multiresolution constellation (QAM or modified PSK) in the following way. The most important data determine the quadrant, the next most important determine which of four subsets is used in the quadrant, and the least important determine which point is used within that subset. This mapping system allows receivers of differing capabilities to detect as much data as they are able, or a single receiver to detect as much data as the channel quality allows. For example, a QPSK receiver could detect the most important data, a modified 16QAM receiver could detect the most important and second most important data, while a modified 64QAM receiver could receive all the data. Furthermore, in an OFDM system, multiresolution transmission is provided by using long guard times and/or wider channel spacing (equivalently, longer symbols) for the more important data. A system using n-level VSB is also described.

    COMMUNICATION SYSTEM
    58.
    发明专利
    COMMUNICATION SYSTEM 未知

    公开(公告)号：CA2653289A1

    公开(公告)日：1994-09-26

    申请号：CA2653289

    申请日：1994-03-25

    Applicant: PANASONIC CORP

    Inventor： OSHIMA MITSUAKI

    IPC: H04L27/00 ,  H04B1/68 ,  H04L1/00 ,  H04L1/22 ,  H04L5/00 ,  H04L27/02 ,  H04L27/04 ,  H04L27/18 ,  H04L27/26 ,  H04L27/34 ,  H04L27/38 ,  H04N5/44 ,  H04N7/015 ,  H04N7/24 ,  H04N7/26 ,  H04N19/89

    Abstract: In the transmitter side, data are divided into two or more groups, according to importance. In a three groups system, for example, the data streams are then mapped onto a multiresolution constellation (QAM or modified PSK) in the following way. The most important data determine the quadrant, the next most important determine which of four subsets is used in the quadrant, and the least important determine which point is used within that subset. This mapping system allows receivers of differing capabilities to detect as much data as they are able, or a single receiver to detect as much data as the channel quality allows. For example, a QPSK receiver could detect the most important data, a modified 16QAM receiver could detect the most important and second most important data, while a modified 64QAM receiver could receive all the data. Furthermore, in an OFDM system, multiresolution transmission is provided by using long guard times and/or wider channel spacing (equivalently, longer symbols) for the more important data. A system using n-level VSB is also described.

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