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91. 发明授权

US4648019A High efficiency ringing generator 失效
标题翻译：高效率振铃发生器
公开(公告)号：US4648019A
公开(公告)日：1987-03-03
申请号：US768593
申请日：1985-08-23
申请人： Douglas C. Stahl
发明人： Douglas C. Stahl
IPC分类号： H03K4/02 , H04M19/02
CPC分类号： H03K4/02 , H04M19/023
摘要： An improved ringing generator is disclosed, for producing and transmitting an AC ringing voltage waveform to a subscriber line from a negative and positive DC voltage source. The ringing generator is characterized by a transformer having a primary winding and a secondary winding. The primary winding includes a plurality of taps dividing the primary winding into a plurality of winding segments. The secondary winding is connected to subscriber line via a filter network. Each winding segment is connected to a buffer-driver which has a first lead connected to the DC voltage source and a second lead connected to a source of control signals. Responsive to the control signals a selected pair of buffer-drivers are alternatively enabled connecting for a predetermined time period the associated coupling segments to the DC voltage source thereby, producing a switched ringing voltage waveform which is coupled to the secondary winding.
摘要翻译：公开了一种改进的振铃发生器，用于从负和正的DC电压源产生和发送AC振铃电压波形到用户线路。振铃发生器的特征在于具有初级绕组和次级绕组的变压器。初级绕组包括将初级绕组分成多个绕组段的多个抽头。次级绕组经由滤波器网络连接到用户线。每个绕组段连接到缓冲器驱动器，其具有连接到DC电压源的第一引线和连接到控制信号源的第二引线。响应于控制信号，所选择的一对缓冲器驱动器可选择地使得能够将预定时间段的相关联的耦合段连接到DC电压源，从而产生耦合到次级绕组的开关振铃电压波形。

92. 发明授权

US4163948A Filter for digital-to-analog converter 失效
标题翻译：滤波器用于数模转换器
公开(公告)号：US4163948A
公开(公告)日：1979-08-07
申请号：US900557
申请日：1978-04-27
申请人： Michael L. Rieger , Martin D. Singer
发明人： Michael L. Rieger , Martin D. Singer
IPC分类号： H03M1/08 , H03H11/04 , H03H11/12 , H03K4/02 , H03K5/01 , H03K5/1252 , H03K6/00 , H03M1/00 , H03K5/08
CPC分类号： H03K5/01 , H03H11/0405 , H03H11/1213 , H03H11/1217 , H03K4/02 , H03K5/1252 , H03M1/0629 , H03M1/0872
摘要： A circuit for attenuating undesired electrical aberrations associated with digital-to-analog converters is provided. Specifically, the circuit is a non-linear filter for attenuating undesired false or spurious electronic signals superimposed on the output waveform of a digital-to-analog converter when the digital word input signal is changed.
摘要翻译：提供了用于衰减与数模转换器相关联的不期望的电像差的电路。具体地说，该电路是一种非线性滤波器，用于当数字字输入信号改变时，衰减叠加在数模转换器的输出波形上的不希望的伪信号或杂散电子信号。

93. 发明授权

US4112382A Digital sweep circuit for generating sawtooth wave form 失效
标题翻译：用于产生锯齿波形的数字扫描电路
公开(公告)号：US4112382A
公开(公告)日：1978-09-05
申请号：US677143
申请日：1976-04-15
申请人： Robert S. Morrow , Lloyd D. Penn
发明人： Robert S. Morrow , Lloyd D. Penn
IPC分类号： G01M1/22 , H03B23/00 , H03H11/12 , H03H11/42 , H03K3/013 , H03K4/02 , H03K4/06 , H03K4/502 , H03K5/08 , H03K5/1252 , H03K7/06 , H03K4/10
CPC分类号： H03H11/126 , G01M1/22 , H03B23/00 , H03H11/42 , H03K3/013 , H03K4/02 , H03K4/06 , H03K4/502 , H03K5/08 , H03K5/1252 , H03K7/06 , H03B2200/0092
摘要： A combination electronic device provides a digital sweep circuit adapted to generate a sweep signal which increases in frequency at constant intervals over a selected range of frequencies and over a selected period of time.
摘要翻译：组合电子设备提供数字扫描电路，其适于产生扫频信号，所述扫描信号以选定的频率范围和选定的时间段以恒定的间隔增加频率。

94. 再颁专利

USRE28784E High-voltage switching for three-color line-sequential color television 失效
标题翻译：用于三色线序彩色电视的高压开关
公开(公告)号：USRE28784E
公开(公告)日：1976-04-20
申请号：US42609
申请日：1970-06-01
申请人： Leonard A. Ferrari
发明人： Leonard A. Ferrari
IPC分类号： H03K3/352 , H03K4/02 , H04N9/27
CPC分类号： H03K4/02 , H03K3/352 , H04N9/27
摘要： This specification discloses a color television system of the type in which a full color image is produced by superimposed red and white images corresponding to different color video signals representing different wavelength contents of the televised scene. The red and white images are produced by accelerating the electron beam to different velocities and the velocity of the electron beam is switched between these different velocities to produce the two superimposed images at the end of each line scan. The system incorporates a high voltage switching system to switch the voltage level applied to the screen of the picture tube in order to provide the necessary velocity switching of the electron beam. This switching comprises a transformer, the second winding of which is coupled with the relatively large capacitance provided by the screen of the picture tube. The primary side of the transformer is switched between open circuit and short circuit conditions. Energy is coupled into .[.and out of.]. the resonant circuit comprising the transformer inductance and the capacitance of the picture tube during a short circuit condition to cause the switching between high voltage levels on the picture tube.

95. 发明授权

US3609387A Reference voltage-switching unit 失效
标题翻译：参考电压切换单元
公开(公告)号：US3609387A
公开(公告)日：1971-09-28
申请号：US3609387D
申请日：1970-03-23
申请人： NASA
发明人： DAVIS EDGAR S
IPC分类号： G06G7/28 , H03K4/02 , H03K23/03
CPC分类号： G06G7/28 , H03K4/02 , Y10T307/702
摘要： A reference voltage-switching unit comprising a dual DC voltage power supply which provides +V DC and -V DC voltages across three of its output terminals, one of which is assumed to be at ground. The three terminals are connected to two unit output terminals through a switching unit which includes a voltage divider and three sets of SPDT contacts. The positions of the three sets of contacts are controlled as a function of the binary states of three stages of a three-stage ring counter. As the counter advanced through its eight-state cycle, the positions of the three sets of contacts vary so that the voltage across the unit output terminals follows a cyclically recirculating pattern including the values of +V, +V/2, O, -V/2,-V, -V/2 O and +V/2.

96. 发明授权

US3590231A Digital signal generator using digital differential analyzer techniques 失效
标题翻译：使用数字差分分析仪技术的数字信号发生器
公开(公告)号：US3590231A
公开(公告)日：1971-06-29
申请号：US3590231D
申请日：1969-04-28
申请人： US NAVY
发明人： WENZL BERNARD P
IPC分类号： G06F7/66 , H03K4/02 , H03K4/06 , G06G7/26 , G06J1/02
CPC分类号： G06F7/66 , H03K4/02 , H03K4/06
摘要： A signal generator capable of generating triangular and sine functions in a bipolar mode. The combination of a counter, adder and accumulator register make up a computing unit which is controlled by timing pulses added accumulatively. When an accumulator register fills, the overflow pulses are accumulated in another register. By combining the outputs of the various registers, the desired functions are produced.

97. 发明授权

US3412339A Variable-gain amplifier 失效
标题翻译：可变增益放大器
公开(公告)号：US3412339A
公开(公告)日：1968-11-19
申请号：US47014365
申请日：1965-07-07
申请人： CONRAD H. KONING
发明人： KONING CONRAD H
IPC分类号： G06G7/163 , G06G7/28 , H03G1/00 , H03K4/02
CPC分类号： H03K4/02 , G06G7/163 , G06G7/28 , H03G1/0088

98. 发明授权

US3090906A Step function generator 失效
标题翻译：步进函数发生器
公开(公告)号：US3090906A
公开(公告)日：1963-05-21
申请号：US6445360
申请日：1960-10-24
申请人： GIANNINI CONTROLS CORP
发明人： DONALD JABLONSKY ROY
IPC分类号： H03K4/02
CPC分类号： H03K4/02

99. 发明授权

US2963579A Stair-step voltage function generator 失效
标题翻译：梯级电压函数发生器
公开(公告)号：US2963579A
公开(公告)日：1960-12-06
申请号：US59926456
申请日：1956-07-20
申请人： CONS ELECTRODYNAMICS CORP
发明人： BERRY CLIFFORD E
IPC分类号： H03K4/02 , H03K6/00
CPC分类号： H03K4/02 , H03K6/00

100. 发明授权

US2882393A Receiver distortion suppression circuit 失效
标题翻译：接收机失真抑制电路
公开(公告)号：US2882393A
公开(公告)日：1959-04-14
申请号：US60873456
申请日：1956-09-10
申请人： MARCONI WIRELESS TELEGRAPH CO
发明人： ERIC DAVIES , HENRYK MIRZWINSKI
IPC分类号： H03K4/02 , H04N5/21
CPC分类号： H03K4/02 , H04N5/21

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