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    VELOCITY SENSING CURSOR CONTROL DEVICE AND METHOD
    13.
    发明专利
    VELOCITY SENSING CURSOR CONTROL DEVICE AND METHOD 未知

    公开(公告)号：DE3465215D1

    公开(公告)日：1987-09-10

    申请号：DE3465215

    申请日：1984-02-20

    Applicant: IBM

    Inventor： BAKER DAVID CURETON ,  BANTZ DAVID FREDERICK ,  FLURRY GREGORY ALAN

    IPC: G05D3/12 ,  G01S15/02 ,  G01S15/46 ,  G01S15/87 ,  G06F3/033 ,  G06F3/042 ,  G06F3/043 ,  G06F3/14 ,  G06K11/06

    Abstract: Apparatus and method according to the present invention includes a wireless cursor position image device (220) and a control base (250) for detecting direction and velocity of motion of the device to calculate relative cursor motion on a display system. The image device includes a light sensing detector (224), a demodulator for removing a reference signal from the detected light, and a transducer (230) driven by the reference signal from the demodulator for transmitting a low frequency signal to the control base (250). The control base includes a light emitter transducer (252) for transmitting a modulated light signal to the image device (220), a reference signal generator, two or more low frequency detectors (254, 256) for detecting signals transmitted by the image device transducer (230), means for comparing the outputs from the detectors, and means for generating cursor control signals from the compared detector output signals.

    14.
    发明专利
    未知

    公开(公告)号：IT8026396D0

    公开(公告)日：1980-12-03

    申请号：IT2639680

    申请日：1980-12-03

    Applicant: IBM

    Inventor： BANTZ DAVID FREDERICK ,  EVANGELISTI CARLO JOHN ,  NELSON ROBERT ARTHUR

    IPC: G06F11/22 ,  G01R31/317 ,  G01R31/3185 ,  G06F11/267 ,  G06F11/36 ,  G06G

    Abstract: An arrangement is described comprising a diagnostic computer (11) connected to a host computer (12) for the purpose of troubleshooting the host computer's hardware and software. The arrangement includes an interface unit (13) comprising specific controls (31, 33, 35) with transfer and mask registers between the diagnostic computer and the host, and control units (22, 23) in the diagnostic computer, to perform functions required by the user of the system. The arrangement is specifically designed for use with a host computer comprising a level-sensitive scan (LSSD) register.

    17.
    发明专利
    未知

    公开(公告)号：ES2154652T3

    公开(公告)日：2001-04-16

    申请号：ES94105696

    申请日：1994-04-13

    Applicant: IBM

    Inventor： AHMADI HAMID ,  BANTZ DAVID FREDERICK ,  BAUCHOT FREDERIC JACQUES ,  KRISHNA ARVIND ,  LA MAIRE RICHARD ORVILLE ,  NATARAJAN KADATHUR S

    IPC: H04J3/00 ,  H04B7/24 ,  H04J3/16 ,  H04L12/28 ,  H04L12/56 ,  H04B7/204

    Abstract: A Medium Access (MAC) Protocol is utilized for wireless radio access for a plurality of remote stations to a base station on a LAN. The MAC protocol is based on a reservation scheme for user data traffic and a random access technique for control and signalling traffic. There is a time division fixed frame structure in which time is slotted, and time slots are grouped into fixed frames consisting of data and control subframes or periods. The fixed frame structure consists of three periods (A, B, and C) along with their respective headers. The first period, the A period, is the outbound channel which is used exclusively for data transfer from the base station to the remote stations. The following period, the B period, is the inbound channel that is used for contention-free data transfer from the remote stations to the base station. The allocation of the data slots in the A and B periods is performed by the base station. The last period of the frame, designated as the C period, is the control channel used for the transmission of reservation requests and data from the remote stations to the base station in a random-access contention mode using a slotted Aloha protocol. The duration of the three periods may be varied using a movable boundary technique. The base station estimates the number of actively transmitting remote stations utilizing feedback information from the remote stations. This estimate is broadcast to the remote stations as control indicia to control their transmission attempts in the C period, thus yielding high transmission efficiency.

    19.
    发明专利
    未知

    公开(公告)号：BR9401624A

    公开(公告)日：1994-11-22

    申请号：BR9401624

    申请日：1994-04-27

    Applicant: IBM

    Inventor： BANTZ DAVID FREDERICK ,  BAUCHOT FREDERIC JACQUES ,  HUANG CHIA-CHI ,  WAY NICHOLAS JOHN ANDREW

    IPC: H04B7/08 ,  H04L1/02 ,  H04B7/04 ,  H04B7/26

    Abstract: In a mobile cellular communication system, a base station is wired to a Local Area Network (LAN), and has wireless communication with a plurality of mobile stations. Multipath fading is substantially reduced in the system by utilizing antenna diversity techniques at the base station and each of the plurality of mobile stations. The combination of the independent operation of antenna selection diversity at both a base station and a mobile station results in the selection of the best propagation path between the two stations.

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