公开(公告)号：US07502603B2

公开(公告)日：2009-03-10

申请号：US11144430

申请日：2005-06-03

申请人： Rishi Mohindra

发明人： Rishi Mohindra

IPC分类号： H04B1/06

CPC分类号： H04B1/30

摘要： Improved DC cancellation in zero-IF receivers for eliminating the DC offset that otherwise would be caused by the AC voltage on a coupling capacitor at the time of switching from AC coupling to DC coupling. The coupling capacitor normally is connected first as a high pass filter to block any DC component, and then directly coupled as a direct or DC coupler. However any AC component of voltage on the coupling capacitor at the moment of switching normally remains as a DC offset. In accordance with the invention, the component of AC voltage on a coupling capacitor is tracked, and when switched to DC coupling, the component of AC voltage on the capacitor at the time of switching is held and subtracted from the signal path, thereby canceling the DC offset component that otherwise would be caused. Alternate embodiments are disclosed, including embodiments for accelerating capacitance charging for speed-up of the method.

摘要翻译： 在零中频接收机中改善了直流消除，消除了在从交流耦合切换到直流耦合时耦合电容上的交流电压否则会导致的直流偏移。 耦合电容器通常首先连接为高通滤波器以阻挡任何DC分量，然后直接耦合作为直流耦合器或直流耦合器。 然而，在正常切换时耦合电容器上的任何交流分量电压都将保持为直流偏移。 根据本发明，跟踪耦合电容器上的AC电压的分量，并且当切换到DC耦合时，在开关时电容器上的AC电压分量被保持并从信号路径中减去，从而取消 DC偏移分量，否则将导致。 公开了替代实施例，包括用于加速电容充电以加速该方法的实施例。

公开(公告)号：US07035341B2

公开(公告)日：2006-04-25

申请号：US10285151

申请日：2002-11-01

申请人： Rishi Mohindra

发明人： Rishi Mohindra

IPC分类号： H04L5/12

CPC分类号： H04L27/3809 ,  H04L2027/0016 ,  H04L2027/0024

摘要： The present invention utilizes circuitry, already present in receivers, to calibrate and correct for gain and phase errors in a transceiver device. The present invention employs a digital signal processor along with multiple phase shifters and all pass networks to ensure proper levels of quadrature signals within the transceiver. An internally generated double sideband suppressed carrier signal is created to produce the calibration signals used by the digital signal processor.

摘要翻译： 本发明利用已经存在于接收机中的电路来校准和校正收发器设备中的增益和相位误差。 本发明采用数字信号处理器以及多个移相器和所有通过网络，以确保收发器内的适当水平的正交信号。 产生内部产生的双边带抑制载波信号以产生由数字信号处理器使用的校准信号。

公开(公告)号：US06678312B1

公开(公告)日：2004-01-13

申请号：US09469322

申请日：1999-12-22

申请人： Rishi Mohindra

发明人： Rishi Mohindra

IPC分类号： H04B1500

CPC分类号： H04B1/707 ,  H04B1/709 ,  H04W52/0245 ,  Y02D70/142 ,  Y02D70/40

摘要： Analog correlation techniques are used in a digital receiver portion of a spread spectrum transceiver to determine when to turn ON given digital receiver components. According to a particular embodiment, an analog correlator receives the down-converted in-phase and quadrature-phase outputs from the radio section and determines when a received signal is coming up at or near a given noise level. A control circuit is coupled to the correlator to selectively activate flash A/D converters in the digital receiver portion of the baseband processor. The analog correlator replaces the RSSI for “sniffing” whether a received signal is present.

摘要翻译： 在扩频收发器的数字接收机部分中使用模拟相关技术来确定何时接通给定的数字接收机组件。 根据特定实施例，模拟相关器从无线电部分接收经下变频的同相和正交相输出，并确定接收到的信号何时在给定噪声电平处或接近给定的噪声电平。 控制电路耦合到相关器以选择性地激活基带处理器的数字接收机部分中的闪存A / D转换器。 模拟相关器代替RSSI进行“嗅探”是否存在接收到的信号。

公开(公告)号：US06442380B1

公开(公告)日：2002-08-27

申请号：US09469880

申请日：1999-12-22

申请人： Rishi Mohindra

发明人： Rishi Mohindra

IPC分类号： H04B106

CPC分类号： H03G3/3068

摘要： A zero intermediate frequency radio device has an antenna for receiving a radio frequency signal, and a frequency down converter for down converting the received radio frequency signal to a zero intermediate frequency signal. The radio device further has controllable amplifier stages, controllable AC-coupling stages, controllable filter stages, and a received signal strength indicator. A signal resolving range of the received signal strength indicator is below a high dynamic range of the received radio frequency signal. The radio device further has an automatic gain controller. The automatic gain controller initially sets the gain of the Rx path of the radio device to a maximum of minimum gain, and then waits for DC-offsets in the Rx path to cancel. If, at maximum or minimum gain, a reading of the received signal strength indicator is within a particular range, the automatic gain controller sets the gain to the reading. Then, automatic gain control settles. If this is not the case, the gain of the Rx path is stepwise decreased or increased, while repeating the DC-offset cancellation step of waiting for the DC-offset to cancel, until the reading of the received signal strength indicator falls in the signal resolving range around the then set gain of the Rx path.

摘要翻译： 零中频无线电设备具有用于接收射频信号的天线和用于将所接收的射频信号下变频为零中频信号的降频转换器。 无线电设备还具有可控制的放大器级，可控制的AC耦合级，可控滤波级和接收信号强度指示器。 接收信号强度指示符的信号分辨范围低于所接收射频信号的高动态范围。 无线电设备还具有自动增益控制器。 自动增益控制器首先将无线电设备的Rx路径的增益设置为最小增益的最大值，然后等待Rx路径中的DC偏移消除。 如果在最大或最小增益下，接收信号强度指示器的读数在特定范围内，则自动增益控制器将增益设置为读数。 然后，自动增益控制结算。 如果不是这种情况，则Rx路径的增益逐步减小或增加，同时重复等待DC偏移消除的DC偏移消除步骤，直到接收信号强度指示符的读取落在信号中 在Rx路径的设定增益周围解决范围。

公开(公告)号：US09621974B2

公开(公告)日：2017-04-11

申请号：US13897444

申请日：2013-05-20

申请人： Rajkumari Mohindra ,  Rishi Mohindra

发明人： Rajkumari Mohindra ,  Rishi Mohindra

IPC分类号： G08B3/10 ,  G08B21/24 ,  H04R1/02 ,  A61J7/04 ,  A61J1/03 ,  A61J1/06 ,  B65D51/24 ,  B65D55/02 ,  H03K17/955 ,  A61J1/14 ,  G08B13/14 ,  G08B13/16 ,  G06F19/00 ,  H04R3/00

CPC分类号： H04R1/021 ,  A61J1/03 ,  A61J1/065 ,  A61J1/1418 ,  A61J7/0409 ,  A61J7/0418 ,  A61J7/0436 ,  A61J7/0481 ,  A61J2200/30 ,  A61J2200/76 ,  A61J2205/60 ,  A61J2205/70 ,  B65D51/248 ,  B65D55/028 ,  B65D2203/12 ,  G06F19/3462 ,  G08B13/149 ,  G08B13/1672 ,  G08B21/24 ,  H03K17/955 ,  H04R3/00 ,  H04R2400/00 ,  H04R2410/00

摘要： An audio signal analysis method is provided for detecting the opening and closing of a medicine bottle cap in a robust manner using a micro speaker and a microphone along with associated mixed signal electronics. It is also used for robust tamper detection and for monitoring liquid medication consumption accurately. In a preferred embodiment an un-modulated OFDM signal is used that covers the entire operating audio spectrum. In another embodiment, Complimentary code based phase encoding of the subcarrier phases is used to reduce the peak to average power of the OFDM signal, thereby enabling higher transmit power of the audio signal to mitigate against interference. A suitable wireless device can be co-located with the mixed signal electronics for sending the bottle usage, medication reminder alarm, and tamper status to the medication compliance monitoring system or to the user's cell phone. In some embodiments of the patent, electrical capacitance sensing is used to determine if the bottle is opened or closed.

公开(公告)号：US09235280B1

公开(公告)日：2016-01-12

申请号：US13480395

申请日：2012-05-24

申请人： Rishi Mohindra

发明人： Rishi Mohindra

IPC分类号： G06F3/045 ,  G06F3/044 ,  G06F3/041

CPC分类号： G06F3/041 ,  G06F3/0416 ,  G06F3/044 ,  G06F3/045

摘要： A method of mitigating a phase shift in a mutual capacitance touch screen panel having a plurality of row conductors intersecting with a plurality of column conductors to form a matrix of pixels, the method comprising: driving the row conductors with row drive signals formed from an excitation matrix, wherein each row in the excitation matrix is orthogonal to every other row in the excitation matrix, and the excitation matrix has a dimension larger than the matrix of pixels; sensing signals from the column conductors; and determining the mutual capacitance of the pixels using the sensed signals and an inverse of the excitation matrix. The excitation matrix can be a Hadamard matrix or a modified Hadamard matrix and can comprise a cyclic extension at the end of each row. A different region-specific phase shift can be applied to different clusters of signals.

摘要翻译： 一种减轻具有与多个列导体相交的多个行导体的互电容触摸屏面板中的相移以形成像素矩阵的方法，所述方法包括：利用由激励形成的行驱动信号来驱动行导体 矩阵，其中激励矩阵中的每行与激励矩阵中的每隔一行正交，并且激励矩阵具有大于像素矩阵的维度; 感测来自列导体的信号; 以及使用所感测的信号和激励矩阵的倒数来确定像素的互电容。 激励矩阵可以是Hadamard矩阵或修改的Hadamard矩阵，并且可以在每行的末尾包括循环扩展。 不同的区域特定相移可以应用于不同的信号簇。

公开(公告)号：US08970544B1

公开(公告)日：2015-03-03

申请号：US13480414

申请日：2012-05-24

申请人： Rishi Mohindra

发明人： Rishi Mohindra

IPC分类号： G06F3/045 ,  G06F3/041

CPC分类号： G06F3/044 ,  G06F3/0416 ,  G06F3/0418

摘要： A touch screen controller for a capacitive touch screen panel having row conductors intersecting column conductors to form pixels, the touch screen controller comprising: a transmitting unit configured to drive the row conductors with signals formed from an excitation matrix, and a receiving unit configured to sense signals from the column conductors and to determine the capacitance of the pixels using the sensed signals. In some embodiments, the receiving unit is configured to apply zero-ISI filtering to the sensed signals prior to the capacitance of the pixels being determined. In some embodiments, the transmitting unit is configured to spread each bit of the row drive signals with a pseudo-noise code, and the receiving unit is configured to de-spread the sensed signals with the pseudo-noise code. In some embodiments, the transmitting unit is configured to pulse shape the row drive signals.

摘要翻译： 一种用于电容式触摸屏面板的触摸屏控制器，其具有与列导体相交的行导体以形成像素，所述触摸屏控制器包括：发送单元，被配置为使用由激励矩阵形成的信号来驱动行导体;以及接收单元， 来自列导体的信号并且使用感测信号来确定像素的电容。 在一些实施例中，接收单元被配置为在确定像素的电容之前对感测到的信号应用零ISI滤波。 在一些实施例中，发送单元被配置为以伪噪声码扩展行驱动信号的每一位，并且接收单元被配置为用所述伪噪声码对所感测的信号进行解扩。 在一些实施例中，发送单元被配置为对行驱动信号进行脉冲整形。

公开(公告)号：US20140341411A1

公开(公告)日：2014-11-20

申请号：US13897444

申请日：2013-05-20

申请人： Rajkumari Mohindra ,  Rishi Mohindra

发明人： Rajkumari Mohindra ,  Rishi Mohindra

IPC分类号： G08B3/10 ,  G08B21/24 ,  H04R1/02

CPC分类号： H04R1/021 ,  A61J1/03 ,  A61J1/065 ,  A61J1/1418 ,  A61J7/0409 ,  A61J7/0418 ,  A61J7/0436 ,  A61J7/0481 ,  A61J2200/30 ,  A61J2200/76 ,  A61J2205/60 ,  A61J2205/70 ,  B65D51/248 ,  B65D55/028 ,  B65D2203/12 ,  G06F19/3462 ,  G08B13/149 ,  G08B13/1672 ,  G08B21/24 ,  H03K17/955 ,  H04R3/00 ,  H04R2400/00 ,  H04R2410/00

摘要： An audio signal analysis method is provided for detecting the opening and closing of a medicine bottle cap in a robust manner using a micro speaker and a microphone along with associated mixed signal electronics. It is also used for robust tamper detection and for monitoring liquid medication consumption accurately. In a preferred embodiment an un-modulated OFDM signal is used that covers the entire operating audio spectrum. In another embodiment, Complimentary code based phase encoding of the subcarrier phases is used to reduce the peak to average power of the OFDM signal, thereby enabling higher transmit power of the audio signal to mitigate against interference. A suitable wireless device can be co-located with the mixed signal electronics for sending the bottle usage, medication reminder alarm, and tamper status to the medication compliance monitoring system or to the user's cell phone. In some embodiments of the patent, electrical capacitance sensing is used to determine if the bottle is opened or closed.

摘要翻译： 提供一种音频信号分析方法，用于使用微型扬声器和麦克风以及相关联的混合信号电子装置以鲁棒的方式检测药瓶盖的打开和关闭。 它还用于稳健的篡改检测和准确监测液体药物消耗。 在优选实施例中，使用覆盖整个操作音频频谱的未调制的OFDM信号。 在另一个实施例中，使用子载波相位的基于免费码的相位编码来减少OFDM信号的峰值到平均功率，由此使音频信号的较高发射功率减轻干扰。 合适的无线设备可以与混合信号电子设备共处，以将瓶子使用，药物提醒报警和篡改状态发送到用药符合性监测系统或用户的手机。 在该专利的一些实施例中，使用电容感测来确定瓶子是否打开或关闭。

公开(公告)号：US20050119025A1

公开(公告)日：2005-06-02

申请号：US10988362

申请日：2004-11-12

申请人： Rishi Mohindra ,  Serge Drogi ,  Hans Dropmann ,  Vikas Vinayak

发明人： Rishi Mohindra ,  Serge Drogi ,  Hans Dropmann ,  Vikas Vinayak

IPC分类号： H04B1/40 ,  H04B1/44 ,  H04M1/00

CPC分类号： H04B1/0021

摘要： A wireless radio for wireless networking communication systems includes a radio frequency (RF) transceiver integrated circuit (IC) and a baseband digital signal processing (DSP) IC. A bidirectional serial digital interface couples data between the RF transceiver IC and the DSP IC to provide a high data rate and low noise. The bidirectional serial digital interface includes a first serial data connection and a second serial data connection. In one embodiment, the RF transceiver IC has a single bit sigma delta A/D modulator to convert an analog signal into a first serial digital bit stream for communication over the first serial data connection. In one embodiment, the DSP IC has a single bit sigma delta digital modulator to generate a second serial digital bit stream for communication over the second serial data connection.

摘要翻译： 用于无线网络通信系统的无线电无线电包括射频（RF）收发器集成电路（IC）和基带数字信号处理（DSP）IC。 双向串行数字接口在RF收发器IC和DSP IC之间耦合数据，以提供高数据速率和低噪声。 双向串行数字接口包括第一串行数据连接和第二串行数据连接。 在一个实施例中，RF收发器IC具有单个比特Σ-ΔA/ D调制器，以将模拟信号转换为第一串行数字比特流，以在第一串行数据连接上进行通信。 在一个实施例中，DSP IC具有单个位Σ-Δ数字调制器，以产生用于通过第二串行数据连接进行通信的第二串行数字位流。

公开(公告)号：US20050020226A1

公开(公告)日：2005-01-27

申请号：US10235222

申请日：2002-09-05

申请人： Rishi Mohindra

发明人： Rishi Mohindra

IPC分类号： H04B1/30 ,  H04B1/06 ,  H04B7/00

CPC分类号： H04B1/30

摘要： This invention describes how to quickly cancel DC offsets that are present in the two quadrature paths of a zero intermediate frequency transceiver. Previously known techniques are not suitable for the 5 GHz WLAN standards because of the very short transmit to receive turn around times and extraordinarily large dc offsets in these systems. This invention solves the above problems. The present invention uses both AC and DC coupling along with automatic gain control techniques to remove unwanted DC offsets within an acceptable time period. The invention further uses a digital signal processor to estimate and subtract out the DC offset errors using time averaged signals. The digital signal processing circuit is capable of further AC filtering and Analog to Digital conversions.

摘要翻译： 本发明描述了如何快速消除存在于零中频收发器的两个正交路径中的直流偏移。 以前已知的技术不适用于5 GHz WLAN标准，因为在这些系统中接收时间短和非常大的直流偏移的传输非常短。 本发明解决了上述问题。 本发明使用AC和DC耦合以及自动增益控制技术来在可接受的时间段内去除不需要的DC偏移。 本发明还使用数字信号处理器来使用时间平均信号来估计和减去DC偏移误差。 数字信号处理电路能够进一步进行交流滤波和模数转换。