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公开(公告)号：US3577090A
公开(公告)日：1971-05-04
申请号：US3577090D
申请日：1969-08-25
申请人： SHELL OIL CO
摘要： Two operational amplifiers are connected in series. The first operational amplifier has a very stable drift characteristic and a feedback capacitor such that it has a very low frequency breakpoint. The second operational amplifier has a very fast response characteristic but may have a poor drift characteristic. A feedback impedance connects the output of a second operational amplifier to the input of the first operational amplifier and the input to the entire circuit is through an input impedance to the inverting input of both the first and second operational amplifiers.
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公开(公告)号：US3700871A
公开(公告)日：1972-10-24
申请号：US3700871D
申请日：1971-06-21
申请人： SHELL OIL CO
CPC分类号： H03G3/3026 , G01V1/245 , H03M1/1205 , H03M1/361
摘要： One hundred low frequency analog signal channels having a very large dynamic range may be amplified to at least half of full scale of a 14-bit analog to digital converter without distortion by an amplifier system that includes a preamplifier for each channel, a filter system for each channel, a gain-ranging multiplexer time-shared between 10 channels, and a second multiplexer that time shares the output of the gain-ranging multiplexers with an instantaneous gain-ranging amplifier. The gain-ranging multiplexer performs part of the multiplexing function and supplies sufficient gain ahead of the second multiplexer, a high speed, higher noise level multiplexer to mask the noise introduced into the system thereby. The output of the system is typically digitized.
摘要翻译： 具有非常大的动态范围的100个低频模拟信号通道可被放大到14位模/数转换器的满量程的至少一半，而无失真的放大器系统包括用于每个通道的前置放大器，用于 每个通道，在10个通道之间共享的增益范围多路复用器，以及时间与瞬时增益测距放大器共享增益范围多路复用器的输出的第二多路复用器。 增益范围多路复用器执行多路复用功能的一部分，并在第二多路复用器之前提供充足的增益，一个高速，更高噪声电平的多路复用器，以便掩盖从而引入系统的噪声。 系统的输出通常被数字化。
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公开(公告)号：US3699325A
公开(公告)日：1972-10-17
申请号：US3699325D
申请日：1969-10-09
申请人： SHELL OIL CO
CPC分类号： H03G3/3026 , G01V1/245 , H03M1/1205 , H03M1/361
摘要： One-hundred low-frequency analog signal channels having a very large dynamic range, may be amplified to at least half of full scale a 14 bit analog to digital converter without distortion by an amplifier system that includes an instantaneous gain-ranger, a preamplifier for each channel, a filter system for each channel, a premultiplexer gain-ranging amplifier for each channel, and a multiplexer. The instantaneous gain-ranger consists of a series of binary amplifier stages, threshold detecting circuitry and logic circuitry. The output is taken from the first unsaturated amplifier. The preamplified and premultiplexer gain-ranging amplifier are connected into the system ahead of the multiplexer and provide a sufficient signal-to-noise ratio to mask the noise introduced into the system by the multiplexer. The output of the system is typically digitized.
摘要翻译： 具有非常大的动态范围的100个低频模拟信号通道可以通过放大器系统被放大到满量程的14位模数转换器的至少一半，而无失真，该放大器系统包括瞬时增益调节器，用于 每个通道，每个通道的滤波器系统，每个通道的预多路复用器增益测距放大器，以及多路复用器。 瞬时增益调节器由一系列二进制放大器级，阈值检测电路和逻辑电路组成。 输出取自第一不饱和放大器。 预放大和预多路复用器增益放大器连接到多路复用器之前的系统中，并提供足够的信噪比以掩蔽多路复用器引入系统的噪声。 系统的输出通常被数字化。
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公开(公告)号：US3651450A
公开(公告)日：1972-03-21
申请号：US3651450D
申请日：1969-10-20
申请人： SHELL OIL CO
CPC分类号： G01V1/247
摘要： A recording system adapted to digitally record the data from a large number of geophones wherein the geophones are divided into subgroups with the data from each subgroup being multiplexed with a local clock signal and transmitted to a central recording station where it is partially demultiplexed, stretched in time, and recorded.
摘要翻译： 一种记录系统，适于数字地记录来自大量地震检波器的数据，其中将地震检波器划分成子组，其中来自每个子组的数据与本地时钟信号复用，并传输到中央记录站，其中被部分解复用， 时间和记录。
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