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8 条记录 (耗时 0.01 秒)

    Seismic playback/monitor system
    1.
    发明授权
    Seismic playback/monitor system 失效
    地震回放/监测系统

    公开(公告)号：US3872465A

    公开(公告)日：1975-03-18

    申请号：US35496973

    申请日：1973-04-27

    申请人： TEXACO INC

    发明人： LOOFBOURROW ROBERT J

    IPC分类号： G01V1/34 ,  H03M1/00 ,  H03K13/04

    CPC分类号： G01V1/34 ,  H03M1/74

    摘要： Hereinafter disclosed is methodology and apparatus for converting wide dynamic amplitude range digital data recorded in floating point digital word form, comprising a binary coded mantissa and a binary coded exponent, to an analog signal or visible display, such as an oscillogram, or ''''wiggle trace,'''' of selectively compressed dynamic amplitude range. The digital word occupying a number of binary digit, or bit, positions is, in algebraic form, + OR - AG E; wherein A represents the mantissa or argument, G represents the base, or radix, of the number system employed, and E represents the exponent. Since the radix G is constant, the only bits that have to be recoreded are those bits representing the mantissa A and the exponent E. In reconverting the aforementioned digital data to analog form data for making an oscillogram, wiggle trace or other visible display, the invention involves the selective compression of the dynamic amplitude range of the analog signals and, at the same time, avoiding the introduction of serious distortions.

    摘要翻译： 以下公开了用于将包括二进制编码尾数和二进制编码指数的浮点数字字形式记录的宽动态幅度数字数据转换为模拟信号或可见显示（如波形图）或“摆动轨迹 ，“选择性压缩动态幅度范围”。 占用多个二进制数字或位位置的数字字是代数形式，为+/- AG < - > E; 其中A表示尾数或参数，G表示所采用的数字系统的基数或基数，E表示指数。 由于基数G是常数，所以必须重新记录的那些位是表示尾数A和指数E的那些位。在将上述数字数据重新转换成用于进行波形图，摆动轨迹或其他可见显示的模拟形式数据时， 本发明涉及对模拟信号的动态幅度范围的选择性压缩，并且同时避免引入严重的失真。

    Amplifier system
    6.
    发明授权
    Amplifier system 失效

    公开(公告)号：US3671931A

    公开(公告)日：1972-06-20

    申请号：US3671931D

    申请日：1969-09-04

    申请人： TEXACO INC

    发明人： LOOFBOURROW ROBERT J

    IPC分类号： G01V1/28 ,  G01V1/24 ,  G08C15/06 ,  H03F3/68 ,  H03F3/72 ,  H03G3/20

    CPC分类号： H03G3/3026 ,  G01V1/245 ,  H03F3/68 ,  H03F3/72

    摘要： A multi-channel wide dynamic range automatic high speed digital gain ranging amplifier system having a common amplifier network for a plurality of channels together with a low level multiplexer means having a plurality of input circuits corresponding to the respective channels of the amplifier system, a common multiplexer output circuit coupled to the input of the common amplifier network and means for time sequentially switching the respective channels of the amplifier system to the input of the amplifier network during respective channel operating intervals. The common amplifier network contains a plurality of amplifier stages coupled in cascade circuit relationship, wherein improved bandwidth is provided by D.C. coupling between the successive cascaded stages together with a filter in a feedback path from the output of the last cascaded stage to the input of the first cascaded stage. The respective outputs of the amplifier stages are coupled through a common output circuit to a comparator circuit for comparison with a predetermined reference signal. Sequencing means are provided for momentarily closing switch means in timed sequence for sequentially coupling the respective outputs of the successive amplifier stages to the comparator circuit during successive, relatively brief sampling time intervals occuring within the respective channel operating interval. Means are provided for selectively maintaining one of the switch means in its closed position during the respective channel operating interval for a holding time interval of longer duration than the sampling time interval when an output signal coupled through said switch means to the common output circuit during one of the sampling intervals bears a predetermined relationship to the reference signal. In a preferred embodiment of the amplifier system, the common output circuit is coupled to an analog-to-digital converter and thence to digital recording means for recording signals corresponding to both the instantaneous digital value of the signal at the common output circuit and the gain level to which the signal is amplified, as determined by the one of said switch means selectively maintained closed to pass the signal to the analog-to-digital converter.