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    2.
    发明专利
    未知

    公开(公告)号：IT1148862B

    公开(公告)日：1986-12-03

    申请号：IT2199780

    申请日：1980-05-13

    Applicant: IBM

    Inventor： CHEVILLAT PIERRE ,  SCHINDLER HANS RUDOLF

    IPC: H04N1/04 ,  G06K9/32 ,  H04N1/00 ,  G01B

    Abstract: A sensor, having a plurality of parallel elongated light transducers, is rotated relative to a document to be aligned with a predetermined reference. A signal accumulated from the transducers reaches a distinct maximum when printed lines on the document are aligned with the elongated transducers. Detection of this maximum enables measurement of the angle by which the document is out of alignment.

    5.
    发明专利
    未知

    公开(公告)号：IT8021997D0

    公开(公告)日：1980-05-13

    申请号：IT2199780

    申请日：1980-05-13

    Applicant: IBM

    Inventor： CHEVILLAT PIERRE ,  SCHINDLER HANS RUDOLF

    IPC: H04N1/04 ,  G06K9/32 ,  H04N1/00 ,  G01B

    Abstract: A sensor, having a plurality of parallel elongated light transducers, is rotated relative to a document to be aligned with a predetermined reference. A signal accumulated from the transducers reaches a distinct maximum when printed lines on the document are aligned with the elongated transducers. Detection of this maximum enables measurement of the angle by which the document is out of alignment.

    ADAPTIVE NOISE-PREDICTIVE PARTIAL-RESPONSE EQUALIZATION FOR CHANNELS WITH SPECTRAL NULLS
    6.
    发明专利
    ADAPTIVE NOISE-PREDICTIVE PARTIAL-RESPONSE EQUALIZATION FOR CHANNELS WITH SPECTRAL NULLS 未知

    公开(公告)号：CA2158014A1

    公开(公告)日：1994-12-22

    申请号：CA2158014

    申请日：1993-06-14

    Applicant: IBM

    Inventor： CHEVILLAT PIERRE ,  ELEFTHERIOU EVANGELOS ,  MAIWALD DIETRICH

    IPC: G11B20/14 ,  G11B5/09 ,  G11B20/10 ,  H04L25/03 ,  H04L25/497

    Abstract: The present application makes use of a novel adaptive noise-predictive parti al-response equalization scheme for channels (30) exhibiting spectral nulls and/or near nulls. The noise-predictive partial re sponse (PR) equalizer employed in the different embodime nts of the present invention consists of a linear PR equalizer (32) which shapes the channel response to a predetermined partial-respons e function, followed by a linear predictor. This scheme modifies the output se quence of said linear partial-response equalizer (32) by whitening the total distortion, i.e. by whitening the noise components and t he residual interference components at said linear PR eq ualizer output, thereby achieving the best possible signal-to-noise ratio (SNR) befo re detection.

    9.
    发明专利
    未知

    公开(公告)号：DE69509804T2

    公开(公告)日：1999-12-09

    申请号：DE69509804

    申请日：1995-06-14

    Applicant: IBM

    Inventor： CHEVILLAT PIERRE ,  CIDECIYAN ROY ,  RUPF MARCEL ,  SCHOTT WOLFGANG

    IPC: H04B7/26 ,  H04J13/00 ,  H04L12/28

    Abstract: A system and method for the wireless transmission of data packets in a code division multiple access communication system wherein one of the code division multiple access channels (PRCH) is used in a time-shared fashion for the transmission of the data packets from several transmitting stations (MSy, MSz) to a receiving station (BS).A request is sent from a transmitting station (MSy) to the corresponding receiving station (BS) of the communication system indicating the destination address to which data packet(s) are to be routed.Then, registering the transmitting station (MSy) and assigning an unique virtual connection identifier (VCIy) to it.Next, the transmitting station (MSy) is attached to the code division multiple access channel (PRCH) used for the transmission of data packets.Then, listening to the downlink of the code division multiple access channel (PRCH) used for the transmission of data packets until the corresponding receiving station (BS) broadcasts that it will be "idle" such that a random access to the code division multiple access channel (PRCH) used for the transmission of data packets is allowed in the next frame.Next, the transnmission power of the transmitting station (MSy) is ramped up during the next frame until a certain power level is reached.The data packet(s) and the virtual connection identifier (VCIy) are transmitted over the uplink of the code division multiple access channel (PRCH) used for the transmission of data packets to the receiving station (BS).The data packet(s) are routed to the destination address.Access to the code division multiple access channel (PRCH) used for the transmission of data packets is controller by a multiple access protocol based on carrier sensing and collision detection (CSMA/CD).

    10.
    发明专利
    未知

    公开(公告)号：DE69509804D1

    公开(公告)日：1999-06-24

    申请号：DE69509804

    申请日：1995-06-14

    Applicant: IBM

    Inventor： CHEVILLAT PIERRE ,  CIDECIYAN ROY ,  RUPF MARCEL ,  SCHOTT WOLFGANG

    IPC: H04B7/26 ,  H04J13/00 ,  H04L12/28

    Abstract: A system and method for the wireless transmission of data packets in a code division multiple access communication system wherein one of the code division multiple access channels (PRCH) is used in a time-shared fashion for the transmission of the data packets from several transmitting stations (MSy, MSz) to a receiving station (BS).A request is sent from a transmitting station (MSy) to the corresponding receiving station (BS) of the communication system indicating the destination address to which data packet(s) are to be routed.Then, registering the transmitting station (MSy) and assigning an unique virtual connection identifier (VCIy) to it.Next, the transmitting station (MSy) is attached to the code division multiple access channel (PRCH) used for the transmission of data packets.Then, listening to the downlink of the code division multiple access channel (PRCH) used for the transmission of data packets until the corresponding receiving station (BS) broadcasts that it will be "idle" such that a random access to the code division multiple access channel (PRCH) used for the transmission of data packets is allowed in the next frame.Next, the transnmission power of the transmitting station (MSy) is ramped up during the next frame until a certain power level is reached.The data packet(s) and the virtual connection identifier (VCIy) are transmitted over the uplink of the code division multiple access channel (PRCH) used for the transmission of data packets to the receiving station (BS).The data packet(s) are routed to the destination address.Access to the code division multiple access channel (PRCH) used for the transmission of data packets is controller by a multiple access protocol based on carrier sensing and collision detection (CSMA/CD).

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