公开(公告)号：US5828330A

公开(公告)日：1998-10-27

申请号：US820535

申请日：1997-03-19

申请人： Phillip J. Benzel

发明人： Phillip J. Benzel

IPC分类号： H03M1/36

CPC分类号： H03M1/367

摘要： The output of an analog to digital converter is selectively controlled to provide a non-linear response by addition or removal of current from resistors in the ADC reference level resistor ladder so that voltage drops are reduced or increased across selected resistors. In one embodiment a current mirror is employed to remove current at selected nodes of the resistor ladder. Span current and current mirror current can be controlled so that span and the desired non-linearity will track when span is altered.

摘要翻译： 选择性地控制模数转换器的输出，以通过从ADC参考电平电阻器梯形图中的电阻器添加或去除电流来提供非线性响应，使得在所选择的电阻器上降低或增加电压降。 在一个实施例中，使用电流镜来去除电阻梯的选定节点处的电流。 可以控制跨度电流和电流镜电流，以便跨越改变时跨越和期望的非线性。

公开(公告)号：US4132985A

公开(公告)日：1979-01-02

申请号：US652548

申请日：1976-01-26

申请人： Mashio Kitaura

发明人： Mashio Kitaura

IPC分类号： G03B7/083 ,  G03B17/18 ,  G03B17/20 ,  G06J1/00 ,  H03M1/00 ,  H03K13/03

CPC分类号： G06J1/00 ,  G03B17/18 ,  G03B17/20 ,  G03B7/083 ,  H03M1/187 ,  H03M1/367

摘要： This invention relates to an automatic camera exposure control device comprising a first light measuring circuit including a photoelectric element receiving light through the objective lens of the camera and generating a first output proportional to the logarithm of the brightness of an object to be photographed, and a circuit for providing a second output indicative of the film sensitivity and the lens aperture value, the light measuring circuit for providing a first signal indicative of the sum of the first and second outputs and a second circuit including a pulse genrator circuit for generating clock pulses and a counter for counting the clock pulses and for producing a second signal of a stairstep waveform corresponding to the counting of a pulse; a voltage comparator circuit for comparing the second signal with the first signal and for producing a signal when the level of the second signal exceeds that of the first signal; a third circuit composed mainly of a gate circuit for stopping the counting of the pulse upon receipt of the threshold level signal from the voltage comparator circuit; and a shutter control circuit including a transistor for inverse logarithmic conversion and for producing a collector current proportional to the exponent of the second signal applied to its base, and a capacitor to be charged by the collector current of the transistor and a switching circuit responsive to the voltage charged in the capacitor in excess of a predetermined level for actuating the shutter to terminate the exposure interval.

公开(公告)号：US3136988A

公开(公告)日：1964-06-09

申请号：US80070859

申请日：1959-03-20

申请人： INT STANDARD ELECTRIC CORP

发明人： TISSO STARR ARTHUR

IPC分类号： H03K3/45 ,  H03K17/82 ,  H03K23/76 ,  H03M1/36 ,  H03M1/66 ,  H03M1/80 ,  H03M5/00 ,  H03M7/16 ,  H03M9/00 ,  H04B14/04 ,  H04L25/49

CPC分类号： H04L25/4906 ,  H03K3/45 ,  H03K17/82 ,  H03K23/76 ,  H03M1/361 ,  H03M1/367 ,  H03M1/664 ,  H03M1/808 ,  H03M5/00 ,  H03M7/16 ,  H03M9/00 ,  H04B14/042 ,  H04B14/044 ,  H04B14/046 ,  H04B14/048

公开(公告)号：US2556200A

公开(公告)日：1951-06-12

申请号：US1126148

申请日：1948-02-26

申请人： INT STANDARD ELECTRIC CORP

发明人： ARNOLD LESTI

IPC分类号： G06G7/28 ,  H03M1/36 ,  H04B14/04

CPC分类号： G06G7/28 ,  H03M1/367 ,  H04B14/048

公开(公告)号：US08054209B2

公开(公告)日：2011-11-08

申请号：US12435224

申请日：2009-05-04

申请人： Alexander Krymski

发明人： Alexander Krymski

IPC分类号： H03M1/12

CPC分类号： H03M1/367 ,  H03M1/56

摘要： An A/D converter suitable for use in a system in which the signal power of noise increases with the signal power of the signal, such as an imaging system, utilizes a variable quantization system for converting analog signals into digital signals. The variable quantization is controlled so that at low signal levels the quantization is similar or identical to conventional A/D converters, while the quantization level is increased at higher signal levels. Thus, higher resolution is provided at low signal levels while lower resolution is produced at high signal levels.

摘要翻译： 适用于其中噪声信号功率随着信号的信号功率（诸如成像系统）增加的系统中的A / D转换器利用可变量化系统将模拟信号转换为数字信号。 控制可变量化，使得在低信号电平下，量化与常规A / D转换器相似或相同，而量化电平在较高信号电平下增加。 因此，在低信号电平下提供更高的分辨率，而在高信号电平下产生较低的分辨率。

公开(公告)号：US20100214139A1

公开(公告)日：2010-08-26

申请号：US12533841

申请日：2009-07-31

申请人： Kheng Hin Toh ,  Gim Eng Chew

发明人： Kheng Hin Toh ,  Gim Eng Chew

IPC分类号： H03M1/48

CPC分类号： G01D5/24419 ,  G01D5/245 ,  H03K5/1252 ,  H03K5/156 ,  H03K2005/00052 ,  H03M1/207 ,  H03M1/365 ,  H03M1/367 ,  H03M1/485

摘要： Disclosed are various embodiments of interpolation circuits for use in conjunction with optical encoders. The analog output signals provided by incremental or absolute motion encoders are provided to an interpolation circuit, which is capable of providing high interpolation factor output signals having high timing accuracy. The disclosed interpolation circuits may be implemented using CMOS or BiCMOS processes without undue effort.

摘要翻译： 公开了与光学编码器结合使用的内插电路的各种实施例。 由增量或绝对运动编码器提供的模拟输出信号被提供给能够提供高定时精度的高内插因子输出信号的内插电路。 公开的内插电路可以使用CMOS或BiCMOS处理而不用过度的努力来实现。

公开(公告)号：US07656339B2

公开(公告)日：2010-02-02

申请号：US12134488

申请日：2008-06-06

申请人： Erik Chmelar

发明人： Erik Chmelar

IPC分类号： H03M1/36

CPC分类号： H03M1/182 ,  H03M1/002 ,  H03M1/004 ,  H03M1/361 ,  H03M1/367

摘要： Various embodiments of the present invention provide systems and methods for analog to digital conversion. For example, an analog to digital converter is disclosed that includes an analog input that is provided to a comparator bank. The comparator bank receives a reference indicator, and is operable to provide a current output based at least in part on a comparison of the analog input with a reference threshold corresponding to the reference indicator. The analog to digital converter further includes a range selection filter that is operable to receive the current output and to generate the reference indicator based at least in part on a prior output of the comparator bank.

摘要翻译： 本发明的各种实施例提供了用于模数转换的系统和方法。 例如，公开了一种模数转换器，其包括提供给比较器组的模拟输入。 比较器组接收参考指示符，并且可操作以至少部分地基于模拟输入与对应于参考指示符的参考阈值的比较来提供电流输出。 模数转换器还包括范围选择滤波器，其可操作以至少部分地基于比较器组的先前输出来接收当前输出并产生参考指示符。

公开(公告)号：US20090267821A1

公开(公告)日：2009-10-29

申请号：US12108791

申请日：2008-04-24

申请人： Erik Chmelar ,  Choshu Ito

发明人： Erik Chmelar ,  Choshu Ito

IPC分类号： H03M1/36

CPC分类号： H03M1/182 ,  H03M1/002 ,  H03M1/004 ,  H03M1/361 ,  H03M1/367

摘要： An ADC circuit includes multiple comparators and a controller coupled to the comparators. Each of the comparators is operative to generate an output indicative of a difference between a first signal representative of an input signal applied to the ADC circuit and a corresponding reference signal. The controller is operative to perform at least one of: (i) activating a subset of the comparators during a given sample period being; and (ii) controlling levels of the corresponding reference signals of the comparators as a function of a level of the input signal. A number of active comparators during the given sample period is no greater than one less than a number of regions into which the input signal is quantized.

摘要翻译： ADC电路包括多个比较器和耦合到比较器的控制器。 每个比较器可操作以产生指示表示施加到ADC电路的输入信号的第一信号与对应的参考信号之间的差的输出。 控制器可操作以执行以下至少之一：（i）在给定的采样周期期间激活比较器的子集; 和（ii）根据输入信号的电平来控制比较器的相应参考信号的电平。 给定采样周期内的多个有源比较器不小于输入信号被量化的区域数量的一个。

公开(公告)号：US07541963B2

公开(公告)日：2009-06-02

申请号：US11523097

申请日：2006-09-19

申请人： Alexander Krymski

发明人： Alexander Krymski

IPC分类号： H03M1/58

CPC分类号： H03M1/367 ,  H03M1/56

摘要： An A/D converter suitable for use in a system in which the signal power of noise increases with the signal power of the signal, such as an imaging system, utilizes a variable quantization system for converting analog signals into digital signals. The variable quantization is controlled so that at low signal levels the quantization is similar or identical to conventional A/D converters, while the quantization level is increased at higher signal levels. Thus, higher resolution is provided at low signal levels while lower resolution is produced at high signal levels.

摘要翻译： 适用于其中噪声信号功率随着信号的信号功率（诸如成像系统）增加的系统中的A / D转换器利用可变量化系统将模拟信号转换为数字信号。 控制可变量化，使得在低信号电平下，量化与常规A / D转换器相似或相同，而量化电平在较高信号电平下增加。 因此，在低信号电平下提供更高的分辨率，而在高信号电平下产生较低的分辨率。

公开(公告)号：US20080252508A1

公开(公告)日：2008-10-16

申请号：US12015473

申请日：2008-01-16

申请人： Tzung-Hung Kang

发明人： Tzung-Hung Kang

IPC分类号： H03M1/34

CPC分类号： H03M1/367 ,  H03M1/1295 ,  H03M1/183 ,  H03M1/362

摘要： A data readout system with non-uniform resolution has a pick up head for reading data stored in an optical disc and generating an analog signal, a reference voltage unit for producing a plurality of reference voltage levels, wherein voltage differences between two adjacent reference voltage levels are not all the same, a plurality of comparators for comparing the reference voltage levels with the analog signal and generating comparison results, and an encoder for encoding the comparison results into a digital signal.

摘要翻译： 具有不均匀分辨率的数据读出系统具有用于读取存储在光盘中的数据并产生模拟信号的拾取头，用于产生多个参考电压电平的参考电压单元，其中两个相邻参考电压电平之间的电压差 多个比较器，用于将参考电压电平与模拟信号进行比较并产生比较结果;以及编码器，用于将比较结果编码为数字信号。