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公开(公告)号：US4124895A
公开(公告)日：1978-11-07
申请号：US783061
申请日：1977-03-30
CPC分类号： G01H3/00
摘要： A remote terminal for use in an acoustic measuring system comprises a measuring device including an input terminal supplied with an analog signal to be measured, an A/D converter for converting the analog signal to a digital signal and an output terminal for manifesting an analyzed result of the analog signal; an analyzing apparatus is used for processing the data of the digital signal and for generating the analyzed result. The measuring device and the analyzing apparatus are coupled by MODEMs to each other through a data transmission circuit.
摘要翻译： 用于声学测量系统的远程终端包括测量装置，其包括被提供有要测量的模拟信号的输入端，用于将模拟信号转换成数字信号的A / D转换器和用于显示分析结果的输出端 的模拟信号; 分析装置用于处理数字信号的数据并产生分析结果。 测量装置和分析装置通过MODEM彼此通过数据传输电路耦合。
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公开(公告)号：US3993869A
公开(公告)日：1976-11-23
申请号：US513756
申请日：1974-10-10
申请人： Osamu Kono , Takeshi Matsudaira , Makoto Ishikawa
发明人： Osamu Kono , Takeshi Matsudaira , Makoto Ishikawa
CPC分类号： H03F3/1855
摘要： An amplifying circuit for use with a transducer includes a pair of field-effect transistors which are of different conductive types from each other and each of which has gate, drain and source electrodes. The gate electrodes of the field-effect transistors are connected to each other and are further connected to an output terminal of an electrostatic type mechanical-electrical transducer, while the source electrodes of the field-effect transistors are connected to each other and are further connected to an output circuit. One of the drain electrodes is connected to a voltage source and the other drain electrode is connected to the circuit ground. High input impedance is maintained by using no gate resistor at the input, and using a current-sourced source-follower secondstage. Source resistors improve linear performance.
摘要翻译： 与换能器一起使用的放大电路包括一对具有不同导电类型的场效应晶体管，每一个具有栅极，漏极和源极。 场效应晶体管的栅电极彼此连接并且进一步连接到静电型机电换能器的输出端，而场效应晶体管的源极彼此连接并进一步连接 到输出电路。 一个漏电极连接到电压源，另一个漏电极连接到电路接地。 通过在输入端不使用栅极电阻，并使用电流源跟随器第二级来保持高输入阻抗。 源电阻提高线性性能。
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3.发明授权
公开(公告)号：US4006313A
公开(公告)日：1977-02-01
申请号：US534299
申请日：1974-12-19
摘要： A transmitting and reproducing system includes an encoder for selectively combining at least four signals for transmission along two channels. At least three of the signals are combined in a predetermined amplitude and phase relationship to form a first unmodulated signal and at least one of the three signals is used to vestigially modulate a carrier. The unmodulated signal and the modulated carrier are combined for transmission along one of the channels. A different grouping of three of the signals are combined in a different predetermined amplitude and phase relationship to form a second unmodulated signal, and at least one signal different from the first modulating signal is used as a second modulating signal for vestigial modulation of the carrier. The second unmodulated signal and the carrier modulated by the different signal are combined for transmission on the second channel. The signals used to modulate the carrier are passed through noise reduction circuits that have frequency response characteristics that compress signal components above a frequency that depends upon the amplitude of the signals passing through the noise reduction circuits. The reproducing part of the system includes a decoder that selectively combines the composite signal on each of the channels with the demodulated signals from the two signals that were originally modulated, thereby reproducing two main signals without interference.
摘要翻译： 发送和再现系统包括用于选择性地组合至少四个信号以用于沿两个信道传输的编码器。 至少三个信号以预定的幅度和相位关系组合以形成第一未调制信号，并且使用三个信号中的至少一个来对载波进行残留调制。 未调制信号和调制载波被组合以沿着一个通道传输。 将三个信号的不同组合以不同的预定幅度和相位关系组合以形成第二未调制信号，并且使用与第一调制信号不同的至少一个信号作为用于载波的残留调制的第二调制信号。 第二未调制信号和由不同信号调制的载波被组合以在第二信道上传输。 用于调制载波的信号通过具有频率响应特性的噪声降低电路，频率响应特性将信号分量压缩在取决于通过降噪电路的信号的幅度的频率上。 系统的再现部分包括一个解码器，其选择性地将每个信道上的复合信号与来自最初被调制的两个信号的解调信号相组合，由此再现两个主信号而不受干扰。
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