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31.发明授权
公开(公告)号：US5528625A
公开(公告)日：1996-06-18
申请号：US176742
申请日：1994-01-03
CPC分类号： H04L25/4927
摘要： The present invention is a quantization-level-sampling (QLS) modem which includes means for separately equalizing each loop of an end-to-end digital telephone system network connection by employing a plurality of transmitter filters and a plurality of receiver filters in such a way that, in the direction of transmission from modem to central office, the voltage samples seen by the coder/decoder stations are equivalent to the network quantization levels transmitted by the modem, and in the direction of transmission from central office to modem, the voltage samples seen by the modem are equivalent to the network quantization levels encoded by the coder/decoder stations. The invention also includes a QLS modem communications system which includes the aforesaid digital telephone system network and a plurality of QLS modems. In preferred embodiments, an adaptation service unit within the telephone system network assists in the determination of the settings of the transmitter and receiver filters.
摘要翻译： 本发明是量化级采样（QLS）调制解调器，其包括通过采用多个发射机滤波器和多个接收机滤波器来分别均衡端到端数字电话系统网络连接的每个环路的装置 在从调制解调器到中心局的传输方向上，由编码器/解码器站所看到的电压样本等同于由调制解调器发送的网络量化级别，并且在从中心局到调制解调器的传输方向上，电压 由调制解调器看到的样本等同于由编码器/解码器站编码的网络量化级。 本发明还包括一个包括上述数字电话系统网络和多个QLS调制解调器的QLS调制解调器通信系统。 在优选实施例中，电话系统网络内的适配服务单元有助于确定发射机和接收机滤波器的设置。
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32.发明授权Data converter with minimum phase FIR filter and method for calculating filter coefficients 失效具有最小相位FIR滤波器的数据转换器和计算滤波器系数的方法
公开(公告)号：US5512898A
公开(公告)日：1996-04-30
申请号：US485303
申请日：1995-06-07
CPC分类号： H03H17/06
摘要： In accordance with an embodiment of the invention, a data converter is disclosed employing at least one minimum phase FIR filter. The data converter includes an analog-to-digital converter for converting an incoming analog signal into a plurality of digital signal samples, followed by a minimum phase FIR filter to filter the digital signal samples. Alternatively, the data converter includes a digital-to-analog converter preceded by a minimum phase FIR filter to filter a plurality of digital signal samples that are converted into an analog signal by the digital-to-analog converter. The data converter may include both analog-to-digital and digital-to-analog conversion. In a preferred embodiment, the minimum phase FIR filter is an optimum minimum phase FIR filter. A method for precisely calculating the filter coefficients of an optimum minimum phase FIR filter is also disclosed.
摘要翻译： 根据本发明的实施例，公开了采用至少一个最小相位FIR滤波器的数据转换器。 数据转换器包括用于将输入模拟信号转换为多个数字信号样本的模数转换器，随后是用于滤波数字信号采样的最小相位FIR滤波器。 或者，数据转换器包括在由最小相位FIR滤波器之前的数模转换器，以对通过数模转换器转换成模拟信号的多个数字信号采样进行滤波。 数据转换器可以包括模拟到数字和数模转换。 在优选实施例中，最小相位FIR滤波器是最佳最小相位FIR滤波器。 还公开了一种用于精确计算最佳最小相位FIR滤波器的滤波器系数的方法。
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公开(公告)号：US5291564A
公开(公告)日：1994-03-01
申请号：US109692
申请日：1993-08-20
申请人： Govind Shah , David G. Shaw , Donald G. Chandler
发明人： Govind Shah , David G. Shaw , Donald G. Chandler
CPC分类号： G06K7/10861 , G06K7/10851
摘要： An optical target is acquired by an optical scanning system according to an in-band target frequency in an input signal from an optical scanning device. Both the in-band energy level and the out-of-band energy level of the input signal from the optical scanning device are determined. These two energy levels are compared and a possible detection of the target is determined according to this comparison. A minimum threshold of in-band energy is required in order for the possible detection to be confirmed.
摘要翻译： 根据来自光学扫描装置的输入信号中的带内目标频率，通过光学扫描系统获取光学目标。 确定来自光学扫描装置的输入信号的带内能级和带外能级两者。 对这两个能级进行比较，根据该比较确定靶的可能检测。 为了确认可能的检测，需要带内能量的最小阈值。
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公开(公告)号：US5251328A
公开(公告)日：1993-10-05
申请号：US630636
申请日：1990-12-20
申请人： David G. Shaw
发明人： David G. Shaw
CPC分类号： H04B1/62
摘要： The problem of noise enhancement is eliminated in communications systems by predistorting the amplitude of the transmitted information signal in a manner which compensates for the amplitude distortion introduced in a portion of the communications channel. In the disclosed embodiments, the communications system includes two signal transceivers which communicate with one another through a communications channel. The communications channel includes two-wire subscriber loops adjacent to each signal transceiver with a four-wire transmission path disposed between the subscriber loops. Each transceiver transmits an information signal which, depending on the system noise characteristics, is predistorted to compensate for all or a portion of the amplitude distortion introduced in a subscriber loop adjacent to that signal transceiver. The predistortion necessary to provide such compensation is determined at each transceiver in response to received signals at that transceiver.
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公开(公告)号：US4320437A
公开(公告)日：1982-03-16
申请号：US161723
申请日：1980-06-23
申请人： David G. Shaw , Angelo Yializis
发明人： David G. Shaw , Angelo Yializis
CPC分类号： H01G4/32
摘要： A roll section for an electrical capacitor comprises a wound composite of alternate strips of polypropylene and aluminum foil with narrow bands of a dielectric coating along the longitudinal edges of the aluminum strips. The coated edges may also be folded for optimum results.
摘要翻译： 用于电容器的辊部分包括沿着铝带的纵向边缘的聚丙烯和铝箔的交替条带和电介质涂层的窄带的缠绕复合物。 涂覆的边缘也可以折叠以获得最佳结果。
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