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    • 73. 发明专利
    • COMMUNICATION SYSTEM
    • JPH09135204A
    • 1997-05-20
    • JP20348596
    • 1996-08-01
    • MARCONI GEC LTD
    • ROBAATO ANTONII SEBUAARAITO
    • H04B7/26H04B7/155H04W48/20H04W84/06H04Q7/22H04Q7/28
    • PROBLEM TO BE SOLVED: To provide a system with which one station is selected out of a large number of fixed ground stations and the mobile station of communication system is connected to a public telephone exchange network or any similar system. SOLUTION: A CPU2 preserves received information in a data base 3 and further successively inquires the main frequencies of other identified cells. Concerning each main frequency with which a readable signal is provided, data concerning the ground station to be sent by that signal are stored in the data base 3 of airplane station. When this processing is performed to all the main ground stations identified by the 1st ground station, evaluation values corresponding to these respective ground stations are provided from the data in the data base received from the ground stations and aerial information, which is possessed through a data bus 4 in the airplane, by the CPU2. Next, the CPU tunes a transmitter-receiver 1 at the frequency of ground station having the highest evaluation value. Thus, the user of intra-airplane exchange 5 is connected to a public telephone exchange network 6.
    • 74. 发明专利
    • MAGNETIC RESONANCE METHOD AND DEVICE
    • JPH09108200A
    • 1997-04-28
    • JP29116696
    • 1996-10-14
    • MARCONI GEC LTD
    • MAIKERU BAARUAIAN ROBAATO YANGU
    • A61B5/055G01R33/28G01R33/34
    • PROBLEM TO BE SOLVED: To accurately recognize the position of an object by attaching the tuning coil device of a closed loop to the object inserted to the area of a body, utilizing detection signals obtained by the execution of magnetic resonance excitation and detection inspection sequences and obtaining the position of the object. SOLUTION: The object 25 is provided with a closed loop coil device 27 so as to track the movement of the object 25 such as a catheter and an operation instrument or the like by the use of an MRI device. The coil device 27 is provided with two coils constituted of the different sections of an electrically conductive track 35 supported on one side of the thin flexible substrate 37 of an electrically insulating material. Then, by a frequency to which the coil device 27 is tuned, the magnetic resonance excitation including at least one magnetic field gradient and the detection inspection sequence are received by the area, the detection signals are obtained and spatially encoded and the position of the coil device 27, that is the object 25, in the area is obtained by utilizing the detection signals.
    • 76. 发明专利
    • MAGNETIC RESONANCE DEVICE AND METHOD
    • JPH0924037A
    • 1997-01-28
    • JP19294196
    • 1996-07-03
    • MARCONI GEC LTD
    • AIAN ROBAATO YANGU
    • G01R33/385A61B5/055G01R33/383G01R33/565
    • PROBLEM TO BE SOLVED: To improve homogeneity of a magnetic field by forming at least a part of two pole pieces having mutually opposing surfaces to determine a gap on which a subject is placed out of a magnetic material of hardly generating an eddy current, and controlling an exciting current to a gradient coil so as to avoid residual magnetism of the magnetic material at non-current-carrying time. SOLUTION: Though a magnetic resonance device to perform a medical examination has an electromagnet system to generate a magnetostatic field through a gas between two pole pieces 1, tail end parts 1A of the pole pieces 1 are formed of a material of hardly generating an eddy current. Magnetic resonance is excited in the human body, and a radio-frequency field is given to the human body in the gap, and a radio-frequency signal emitted from the human body is detected, and data on the human body is pulled out. In this case, in a sequence of an exciting current, in order to impose a sequence having a desired gradient on a magnetic field in the gap, the sequence of an exciting current is given to gadient coil arrangement, and the magnitude of the exciting current given so that residual magnetism does not substantially remain in the material at finish time of excitation and a detecting sequence is controlled.
    • 77. 发明专利
    • SWITCHING DEVICE
    • JPH08256038A
    • 1996-10-01
    • JP30078595
    • 1995-10-25
    • MARCONI GEC LTD
    • RIIAMU MAIKERU DEBURINBURAIAN JIEFURII BATSUKU
    • H03H11/24H03K17/693
    • PROBLEM TO BE SOLVED: To obtain an attenuator switching device which gets every of many selectable attenuating states in a signal path and does not apply plural switching element resistances to the path at that time. SOLUTION: A switching device has a 1st switching element 19 in a signal path of each attenuation possible port and an attenuating means that is connectable through a further switching means which is on a opposite side of the element 19, and the element 19 forms every serial elements in the path. The attenuating means has a resistor network 18, and the further switching means has 2nd switching elements 31 and 32 which are connected to each end of the element 19 and each point of the resistor network in order to introduce one of many resistor states. Related ports are separated by turning off the 1st and 2nd switching elements or turning off a 3rd switching element that is serially connected among the 1st element, the 2nd switching element and an end of the element 19 that is located at a downstream of a signal flow path. Switching elements are FETs, and a switching circuit takes single-pole double-throw (SPDT) switching or a switching form that has various numbers of 'poles' and 'throws'.