公开(公告)号：US06469649B1

公开(公告)日：2002-10-22

申请号：US09520912

申请日：2000-03-08

申请人： Roger Helkey ,  Jonathan Twichell

发明人： Roger Helkey ,  Jonathan Twichell

IPC分类号： H03M112

CPC分类号： H03M1/1245 ,  G02F7/00

摘要： An apparatus for digitizing an analog electrical signal comprises a linearized sampler having an analog electrical input and a sampling input, a bandpass filter having a center frequency of at least half of the quantization rate of a quantizer in communication with the sampler, and the quantizer in communication with the bandpass filter. The linearized sampler in one embodiment is a linearized optical modulator with an optical input. The sampler frequency in another embodiment is chosen such that second-order distortion products generated in the sampler are separated in frequency from the sampled input band.

摘要翻译： 一种用于数字化模拟电信号的装置包括具有模拟电输入和采样输入的线性化采样器，具有与采样器通信的量化器的量化速率的至少一半的中心频率的带通滤波器，以及量化器 与带通滤波器通信。 一个实施例中的线性化采样器是具有光输入的线性化光调制器。 选择另一实施例中的采样器频率使得在采样器中产生的二阶失真产物在频率上与采样的输入频带分离。

公开(公告)号：US20170270525A1

公开(公告)日：2017-09-21

申请号：US15462258

申请日：2017-03-17

申请人： Clyde Valdez ,  Clint Florez ,  Peng Zhao ,  Amit Gupta ,  Miguel Lunaparra ,  Mimi Le ,  Swapneel Mahajan ,  Jonathan Twichell

发明人： Clyde Valdez ,  Clint Florez ,  Peng Zhao ,  Amit Gupta ,  Miguel Lunaparra ,  Mimi Le ,  Swapneel Mahajan ,  Jonathan Twichell

IPC分类号： G06Q20/40 ,  G06Q20/24 ,  G06Q20/26 ,  G06Q20/34

CPC分类号： G06Q20/405 ,  G06Q20/24 ,  G06Q20/26 ,  G06Q20/34

摘要： The claimed system and method allows for an electronic payment system to accept a single card that is both a debit card and a credit card. Further, a user may indicate a default value for the card regarding whether the card should be used as a debit card or a credit card.