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    Holographic telephone directory with cinematographic accession of information
    2.
    发明授权
    Holographic telephone directory with cinematographic accession of information 失效
    具有电子信息存储信息的全景电视目录

    公开(公告)号：US3612640A

    公开(公告)日：1971-10-12

    申请号：US3612640D

    申请日：1969-09-23

    Applicant: BELL TELEPHONE LABOR INC

    Inventor： KOGELNIK HERWIG W

    IPC: G03H1/16 ,  G06K17/00 ,  G02B27/00 ,  G03B23/12

    CPC classification number: G03H1/16 ,  G06K17/00

    Abstract: An associative memory is disclosed that relates a first item of information, such as a name, to a second item of information, such as a telephone number. First, each unit of information, which comprises two sets of symbols constituting a first item of information and its associated second item of information, is arranged in sequence according to a place, or positional, order. In such an order, all units of information that have identical symbols at a first position within each first item of information are arranged consecutively and the units within each such consecutive arrangement are similarly order by the symbols at a second position and so on. The Fourier transforms of each unit of information in the sequence are then formed individually; and a hologram of each transform is recorded in sequence on a photosensitive medium. When this information is viewed by illuminating a single hologram in the set of ordered Fourier transform holograms and moving a sequence of such holograms through the illuminating beam, only the identical symbols in the ordered items of information will be clearly seen. Thus, in the example above, if the names are stored in alphabetic order on the holograms, when the holograms are moved rapidly, only the first few letters of the recorded names will remain constant enough to be viewable; but when the holograms are moved slowly, most, or all, the letters of the names will be viewable. So by gradually slowing the speed of the holograms moving through the illuminating beam, it is possible to work through a large number of holograms to find the particular set of symbols, such as a telephone number, that is associated with a particular set of ordered symbols, such as a name.

    Instantaneous fourier frequency analyzer using an interferometer
    7.
    发明授权
    Instantaneous fourier frequency analyzer using an interferometer 失效
    使用干扰仪的瞬时分析仪频率分析仪

    公开(公告)号：US3564405A

    公开(公告)日：1971-02-16

    申请号：US3564405D

    申请日：1968-02-09

    Applicant: BELL TELEPHONE LABOR INC

    Inventor： KOGELNIK HERWIG W

    IPC: G01R23/00 ,  G01R23/16

    CPC classification number: G01R23/00

    Abstract: INSTANTANEOUS FOURIER ANALYSIS OF THE FREQUENCY COMPONENTS IN A SIGNAL IS PERFORMED BY MEANS OF THE ANALYSIS OF THE PATTERN OF INTERFERENCE FRINGES PRODUCED BY TWO COHERENT LIGHT BEAMS, WHICH ARE INTENSITY MODULATED IN ACCORDANCE WITH THE SIGNAL AND WHICH ARE PROVIDED WITH A SYSTEMATICALLY VARIED PHASE DIFFERENCE BETWEEN INTERFERING RAYS IN THE BEAMS. THE PHASE DIFFERENCE IS VARIED IN ACCORDANCE WITH A LINEAR FUNCTION OF THE ALGEBRAIC PRODUCT OF TIME AND ANY FUNCTION OF DISTANCE FROM A POINT IN THE INTERFERENCE PATTERN WHERE THE PHASE DIFFERENCE IS ALWAYS EQUAL TO ZERO. IN ONE EMBODIMENT, THIS TYPE OF VARYING PHASE IS OBTAINED BY APPLYING A SAW-TOOTH TIME VARYING ELECTRIC VOLTAGE ACROSS A PAIR OF COMPOUND PRISMS, MADE OF ELECTRO-OPTIC MATERIAL IN PART, UPON WHICH THE

    BEAMS ARE INCIDENT IN EACH ARM OF A MICHELSON INTERFEROMETER ARRANGEMENT, THEREBY DEFLECTING THE BEAMS THROUGH AN ANGLE WHICH IS LINEARLY PROPORTIONAL TO THE TIME AFTER EACH SAW-TOOTH HAS COMMENCED. OBSERVABLE CHANGES IN THE PATTERN OF INTERFERENCE FRINGES OCCUR WHEN THE LIGHT INTENSITY IS THUS MODULATED IN ACCORDANCE WITH THE SIGNAL, AS COMPARED WITH NO SUCH MODULATION, AND THESE CHANGES OCCUR ONLY AT POSITIONS IN THE INTERFERENCE PATTERN DETERMINED BY THE RESPECTIVE FREQUENCY COMPONENTS IN THE SIGNAL.

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