公开(公告)号：US5568513A

公开(公告)日：1996-10-22

申请号：US59932

申请日：1993-05-11

申请人： Thomas M. Croft ,  Paul W. Dent ,  Lawrence J. Harte ,  Torbjorn Solve

发明人： Thomas M. Croft ,  Paul W. Dent ,  Lawrence J. Harte ,  Torbjorn Solve

IPC分类号： H04B1/16 ,  H04L1/00 ,  H04L1/08 ,  H04L7/04 ,  H04M19/08 ,  H04W52/02 ,  H04B3/46 ,  H04B7/00 ,  G08B5/22

CPC分类号： H04L1/0061 ,  H04L1/0053 ,  H04L1/08 ,  H04L7/048 ,  H04M19/08 ,  H04W52/0216 ,  H04W52/0229 ,  H04W52/0235 ,  Y02B60/50

摘要： A power saving standby mode that can be used in mobile radio stations operating in current networks and improves in the intended message reception. The invention enters the power down mode principally contingent upon the CRC check being successful. Additionally, the invention uses a cumulative majority vote procedure which results in a higher probability of correct reception of a message addressed to the receiving station.

摘要翻译： 一种省电待机模式，可用于在当前网络中运行的移动无线电台，并改善预期的消息接收。 本发明主要取决于CRC校验成功进入掉电模式。 此外，本发明使用累积多数表决程序，这导致更正确地接收到接收站的消息的概率。

公开(公告)号：US5680418A

公开(公告)日：1997-10-21

申请号：US345848

申请日：1994-11-28

申请人： Thomas M. Croft ,  Torbjorn W. Solve ,  Paul W. Dent

发明人： Thomas M. Croft ,  Torbjorn W. Solve ,  Paul W. Dent

IPC分类号： G01N27/12 ,  G01N30/66 ,  H03D3/00 ,  H03D13/00 ,  H04L22/06

CPC分类号： H03D3/006 ,  G01N27/12 ,  G01N30/66 ,  H03D3/002

摘要： In a digital FM receiver having a demodulator that receives a radio signal and generates therefrom a phase sample whose behavior determines an output of the demodulator, an apparatus for removing a low-frequency interference signal from the phase sample converts the phase sample into a frequency sample which is then high-pass filtered to produce a filtered frequency sample. The filtered frequency sample is then converted into a filtered phase sample, which may be further demodulated in accordance with known techniques. Converting the phase sample into a frequency sample may be performed by a first order difference circuit. Converting the filtered frequency sample into the filtered phase sample may be performed by an integrator. Because the demodulator may produce degraded performance when the inventive apparatus is applied to a radio signal that does not have low-frequency interference, in another aspect of the invention the demodulator is further provided with a circuit for detecting the presence of the low-frequency interference signal in the radio signal, and alternatively selecting, in response thereto, either the filtered or original phase sample to be supplied to further demodulation circuitry.

摘要翻译： 在具有接收无线电信号并由其产生行为确定解调器的输出的相位采样的解调器的数字FM接收机中，从相位采样中去除低频干扰信号的装置将相位样本转换成频率样本 然后将其高通滤波以产生滤波频率样本。 滤波后的频率采样然后被转换成滤波的相位采样，其可以根据已知的技术进一步解调。 将相位采样转换为频率采样可以由一阶差分电路执行。 将滤波后的频率采样转换成滤波的相位采样可由积分器进行。 因为当将本发明的设备应用于不具有低频干扰的无线电信号时，解调器可能产生降级的性能，在本发明的另一方面，解调器还设置有用于检测低频干扰的存在的电路 信号，并且作为响应，选择要提供给另外的解调电路的滤波或原始相位采样。

公开(公告)号：US5715278A

公开(公告)日：1998-02-03

申请号：US479351

申请日：1995-06-07

申请人： Thomas M. Croft ,  Paul W. Dent ,  William J. Croughwell, III

发明人： Thomas M. Croft ,  Paul W. Dent ,  William J. Croughwell, III

IPC分类号： H04B1/16 ,  H04L1/00 ,  H04L1/08 ,  H04L7/033 ,  H04L7/04 ,  H04M19/08 ,  H04W52/02 ,  H04B3/46 ,  G06F11/00

CPC分类号： H04L7/048 ,  H04L1/0053 ,  H04L1/0057 ,  H04L1/0061 ,  H04L1/08 ,  H04M19/08 ,  H04W52/0216 ,  H04W52/0229 ,  H04W52/0235 ,  Y02B60/50

摘要： A method and system for increasing the probability of receiving a message in mobile communication systems. The invention uses a synchronization pattern to determine the location of an intended message. In addition, the invention uses the CRC check status of several sample timing positions spanning an expected message location to determine whether to accept a message. The expected message location is based on the sample timings of previous messages which are determined from a histogram of how frequently various sample timing positions have been selected in the past.

摘要翻译： 一种用于增加在移动通信系统中接收消息的概率的方法和系统。 本发明使用同步模式来确定预期消息的位置。 此外，本发明使用跨越预期消息位置的几个采样定时位置的CRC校验状态来确定是否接受消息。 期望的消息位置是基于从过去已经选择了各种采样定时位置的频率的直方图确定的先前消息的采样定时。

公开(公告)号：US5841816A

公开(公告)日：1998-11-24

申请号：US218236

申请日：1994-03-28

申请人： Paul W. Dent ,  Thomas M. Croft

发明人： Paul W. Dent ,  Thomas M. Croft

IPC分类号： H04L27/22 ,  H04B7/08 ,  H04L25/03 ,  H04L25/30 ,  H04L27/233 ,  H04L29/12 ,  H04L1/06 ,  H04L7/04

CPC分类号： H04L25/03178 ,  H04B7/0857 ,  H04L27/2337 ,  H04L2025/0356

摘要： A method and system for demodulating received signals in radio communication systems. Pi/4-DQPSK modulated signals can be demodulated to provide additional quality measurements and to facilitate diversity combination or selection. For example, a carrier is modulated with digital data using Pi/4-DQPSK to convey two bits of data by changing the radio carrier phase from the value at the end of the last symbol through an angle of either .+-.45 degrees or .+-.135 degrees, these four possibilities representing the bit pairs 00, 01, 11 or 10. The transitions of the radio signal are filtered in the complex (I,Q) plane to limit the spectrum. At the receiver, the received signal is downconverted, filtered and amplified using a hard-limiting intermediate frequency (IF) amplifier. The IF amplifier also produces an approximately logarithmic indication of the signal strength before limiting. The hard-limited IF signal containing phase information is fed to a direct phase digitizer. A numerical value representing instantaneous phase is produced and processed to demodulate data symbols. The demodulated data symbols can be combined with the logarithmic signal strength information to produce quality-annotated data bits to an error-correction decoder.

摘要翻译： 一种在无线电通信系统中解调接收信号的方法和系统。 可以对Pi / 4-DQPSK调制信号进行解调，以提供额外的质量测量并促进分集组合或选择。 例如，使用Pi / 4-DQPSK通过数字数据对载波进行调制，以通过将最后一个符号的结尾处的无线电载波相位改变为+/- 45度或+ / -135度，这四种可能性代表位对00,01,11或10.无线电信号的转变在复数（I，Q）平面中被滤波以限制频谱。 在接收机处，使用硬限幅中频（IF）放大器对接收到的信号进行下变频，滤波和放大。 IF放大器还产生限制前的信号强度的近似对数指示。 包含相位信息的硬限制IF信号被馈送到直接相位数字转换器。 产生表示瞬时相位的数值并进行处理以解调数据符号。 解调的数据符号可以与对数信号强度信息组合以产生质量注释的数据位到纠错解码器。

公开(公告)号：US5774799A

公开(公告)日：1998-06-30

申请号：US634229

申请日：1996-04-18

申请人： Thomas M. Croft ,  Gregory E. Bottomley ,  Ravinder D. Koilpillai

发明人： Thomas M. Croft ,  Gregory E. Bottomley ,  Ravinder D. Koilpillai

IPC分类号： H03J7/02 ,  H03J1/00 ,  H03J7/04 ,  H04B1/10 ,  H04B1/18

CPC分类号： H03J7/04 ,  H03J1/0008

摘要： A robust automatic frequency control (AFC) loop for use in radio frequency systems performs a threshold test on the accumulated error adjustments for controlling a frequency oscillator. Based on this test, the loop adjusts the value contained in the error accumulator to allow the receiver to remain locked to a desired frequency carrier even in the presence of a strong adjacent channel interferer. The AFC loop is designed to be used in error systems where the predetermined fixed carrier spacing. Assuming that the initial frequency error is never exceeded by one-half the carrier spacing, the system can determine if the wrong channel has been locked to if the oscillator in the AFC loop is corrected by more than half the carrier spacing. Through use of a threshold test on the accumulative oscillator correction, the AFC loop can determine if the receiver has locked to an adjacent interfering channel. Having determined such a lock has occurred, the oscillator can be adjusted by plus or minus one channel, thus reestablishing connection of the AFC loop to the desired channel.

摘要翻译： 用于射频系统的强大的自动频率控制（AFC）回路对累积的误差调整进行阈值测试，以控制频率振荡器。 基于该测试，该循环调整包含在误差累加器中的值，以允许接收机即使在存在强相邻信道干扰源的情况下也保持锁定到期望的频率载波。 AFC循环设计用于在预定的固定载波间隔的误差系统中。 假设初始频率误差不会超过载波间隔的一半，如果AFC环路中的振荡器校正了载波间隔的一半以上，则系统可以确定错误的信道是否被锁定。 通过对累积振荡器校正使用阈值测试，AFC循环可以确定接收机是否锁定到相邻的干扰信道。 已经确定了这种锁定后，振荡器可以通过加或减一个通道进行调整，从而重新建立AFC回路与所需通道的连接。

公开(公告)号：US06195564B1

公开(公告)日：2001-02-27

申请号：US08933982

申请日：1997-09-19

申请人： Nils Rydbeck ,  Thomas M. Croft

发明人： Nils Rydbeck ,  Thomas M. Croft

IPC分类号： H04Q732

CPC分类号： H04W88/02 ,  H04M1/7253

摘要： A first wireless link between a communication device and a wireless modem is automatically established, so that electronic messages can be easily and automatically transferred between the communication device and a data network via the first wireless link and a second link between the wireless modem and the data network. Each of the communication device and the wireless modem can automatically determine whether an electronic message is to be transferred. When one of the communication device and the wireless modem determines that an electronic message is to be transferred, the determining one of the communication device and the wireless modem sends a page signal to the other one of the communication device and the wireless modem. When the other one of the communication device and the wireless modem receives the page signal and responds, the first wireless link is established. The electronic message is then transferred between the communication device and the data network via the first wireless link and the second link. The communication device can be a portable computer such as a laptop computer, and the wireless modem can reside in a cellular or personal communication system (PCS) phone or the like.

摘要翻译： 自动地建立通信设备和无线调制解调器之间的第一无线链路，使得电子消息可以经由第一无线链路在通信设备和数据网络之间容易且自动地传送，并且无线调制解调器和数据之间的第二链路 网络。 通信设备和无线调制解调器中的每一个可以自动地确定是否要传送电子消息。 当通信设备和无线调制解调器中的一个确定要传送电子消息时，通信设备和无线调制解调器中的确定一个将寻呼信号发送到通信设备和无线调制解调器中的另一个。 当另一个通信设备和无线调制解调器接收页面信号并作出响应时，建立第一无线链路。 然后，电子消息经由第一无线链路和第二链路在通信设备和数据网络之间传送。 通信设备可以是诸如膝上型计算机的便携式计算机，并且无线调制解调器可以驻留在蜂窝或个人通信系统（PCS）电话等中。

公开(公告)号：US6078826A

公开(公告)日：2000-06-20

申请号：US86873

申请日：1998-05-29

申请人： Thomas M. Croft ,  Paul Dent

发明人： Thomas M. Croft ,  Paul Dent

IPC分类号： H02J9/00 ,  H04B1/16 ,  H04M1/73 ,  H04W52/02 ,  H04B1/38

CPC分类号： H02J9/005 ,  H04B1/1615 ,  H04W52/0254 ,  H04W4/02 ,  Y02B60/50

摘要： A mobile telephone able to save power in response to the position of the mobile telephone is disclosed. Location circuitry within the mobile telephone enables the establishment of one or more deep-sleep locations associated with a mobile telephone. When the location circuitry determines that the current location of the mobile telephone is within a selected distance of one of the deep-sleep locations, the mobile telephone operates according to a low power mode of operation wherein only a timer enabling periodic updates of the mobile telephone's position is active. If the location circuitry determines that the mobile telephone is not within a selected distance of one of the predetermined locations, the mobile telephone operates in a standby mode which utilizes more power than the deep-sleep mode but still conserves battery power and enables the mobile telephone to receive calls.

摘要翻译： 公开了能够响应于移动电话的位置来节省电力的移动电话。 移动电话内的位置电路使得能够建立与移动电话相关联的一个或多个深度睡眠位置。 当位置电路确定移动电话的当前位置在深度睡眠位置之一的选定距离内时，移动电话根据低功率操作模式操作，其中只有定时器能够定期更新移动电话的 职位是活跃的 如果位置电路确定移动电话不在预定位置之一的选定距离内，则移动电话在待机模式下工作，该待机模式利用比深度睡眠模式更多的功率，但是仍然节省电池电力并且使移动电话 接听电话。

公开(公告)号：US06801931B1

公开(公告)日：2004-10-05

申请号：US09619971

申请日：2000-07-20

申请人： Rajaram Ramesh ,  Tripurasundari Ramesh ,  Thomas M. Croft

发明人： Rajaram Ramesh ,  Tripurasundari Ramesh ,  Thomas M. Croft

IPC分类号： G06F1516

CPC分类号： G06Q10/107

摘要： Electronic messages are personalized by rendering the messages to recipients in the voice of a predetermined human speaker. This is accomplished by associating with the message payload a set of basis vectors comprising speech parameters from the predetermined human speaker for use in speech synthesis.

摘要翻译： 通过将消息呈现给预定的人类讲话者的声音中的收件人来个性化电子消息。 这是通过与消息有效载荷相关联的一组基本矢量来实现的，该组矢量包括来自预定人类讲话者的用于语音合成的语音参数。

公开(公告)号：US06493670B1

公开(公告)日：2002-12-10

申请号：US09418528

申请日：1999-10-14

申请人： Thomas M. Croft

发明人： Thomas M. Croft

IPC分类号： G10L1504

CPC分类号： H04M1/271

摘要： A method and apparatus providing a telephone user with a manner in which to send DTMF commands during a call over a communication network by use of a speech-based user interface. The user speaks one or more words corresponding to DTMF commands, and the invention performs speech recognition on the spoken words, generates corresponding DTMF signals, and transmits the DTMF signals over the network.

摘要翻译： 一种方法和装置，其通过使用基于语音的用户界面，在通过通信网络的呼叫期间向电话用户提供发送DTMF命令的方式。 用户说一个或多个对应于DTMF命令的单词，本发明对口语进行语音识别，产生相应的DTMF信号，并通过网络发送DTMF信号。