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1. 发明公开

EP2092685A4 SYSTEM AND METHOD FOR SECURE ELECTRONIC COMMUNICATION SERVICES 审中-公开
标题翻译：系统和方法提供安全的电子通信服务
公开(公告)号：EP2092685A4
公开(公告)日：2012-02-22
申请号：EP07845531
申请日：2007-11-20
申请人： YEAP TET HIN , GOELLER THOMAS ANTON
发明人： YEAP TET HIN , GOELLER THOMAS ANTON
IPC分类号： H04L29/06 , H04L9/30 , H04L9/32 , H04L12/58
CPC分类号： H04L9/007 , H04L9/0836 , H04L9/3073 , H04L9/3263 , H04L29/12066 , H04L51/00 , H04L51/38 , H04L61/1511 , H04L63/062 , H04L63/0861

2. 发明申请

WO02058405A3 METHOD AND APPARATUS FOR CONVERTING SUBSCRIBER LOOPS FOR DELIVERY OF BOTH POTS SERVICES AND HIGH SPEED DATA 审中-公开
标题翻译：用于转换用于交付两个服务和高速数据的订户的方法和装置
公开(公告)号：WO02058405A3
公开(公告)日：2003-04-03
申请号：PCT/CA0200063
申请日：2002-01-18
申请人： ESION NETWORKS INC , YEAP TET HIN
发明人： YEAP TET HIN
IPC分类号： H04L12/28 , H04Q1/10 , H04Q1/14 , H04M11/06
CPC分类号： H04L12/2892 , H04L12/2856 , H04M11/062 , H04Q1/10 , H04Q1/14
摘要： In order to enable both POTS and high speed data communications via a plurality of subscriber loops connected to central office by way of a junction unit and a feeder cable, a bank of POTS splitters and a high speed data interface are located adjacent the junction unit and conductors of the subscriber loops are connected to the bank of POTS splitters. Preferably, the connector blocks in the JWI are duplicated in the box containing the POTS splitters. The usual jumper conductors in the JWI are removed and the connector blocks in the JWI connected to the connector blocks in the POTS splitter box by bridging conductors. With this arrangement, it is possible to remake the connections to the subscriber loops one at a time, thus reducing disruption to service.
摘要翻译：为了能够通过连接单元和馈电电缆连接到中心局的多个用户环路实现POTS和高速数据通信，一组POTS分离器和高速数据接口位于连接单元附近，用户回路的导体连接到POTS分离器组。优选地，JWI中的连接器块被复制在包含POTS分离器的盒中。 JWI中通常的跳线导体被去除，JWI中的连接器块通过桥接导体连接到POTS分线盒中的连接器块。通过这种安排，可以一次一个地重新连接到用户回路，从而减少服务中断。

3. 发明申请

WO2008061344A1 SYSTEM AND METHOD FOR SECURE ELECTRONIC COMMUNICATION SERVICES 审中-公开
标题翻译：用于安全电子通信服务的系统和方法
公开(公告)号：WO2008061344A1
公开(公告)日：2008-05-29
申请号：PCT/CA2007002061
申请日：2007-11-20
申请人： YEAP TET HIN , GOELLER THOMAS ANTON
发明人： YEAP TET HIN , GOELLER THOMAS ANTON
IPC分类号： H04L9/30 , H04L9/32 , H04L12/58
CPC分类号： H04L9/007 , H04L9/0836 , H04L9/3073 , H04L9/3263 , H04L29/12066 , H04L51/00 , H04L51/38 , H04L61/1511 , H04L63/062 , H04L63/0861
摘要： A system, method and software module for secure electronic communication services, wherein a public key (25) of private-public-key pair (30,25) is associated with an email address (24), internet name or other registered unique identifier; the registered user of the unique identifier holds the private-key (30) securely, and the respective public-key (25) is made accessible on a key server (6) for look-up and retrieval by other users, for encryption of communications to be sent to the holder of the private- key, and optionally for message confidentiality, message integrity and authentication of sender and recipient, without requiring certificates. A distributed and scalable system is provided by a server network (600; 401, 501) for registration, key distribution and management preferably using a kDNS server hierarchy (601,602,603) and associated protocols so that public-keys of recipients can be searched and retrieved over the internet based on the recipients email address or other unique identifier, thus facilitating secure communication between users in different network domains and organizations.
摘要翻译：一种用于安全电子通信服务的系统，方法和软件模块，其中私钥公钥（30,25）的公钥（25）与电子邮件地址（24），互联网名称或其他注册的唯一标识符相关联; 唯一标识符的注册用户可以安全地保存私钥（30），并且可以在密钥服务器（6）上访问相应的公开密钥（25）以供其他用户查询和检索，用于通信加密发送给私钥的持有人，并且可选地用于消息的机密性，消息的完整性和发送者和接收者的认证，而不需要证书。分布式和可扩展的系统由服务器网络（600; 401,501）提供，用于优选地使用kDNS服务器层级（601,602,603）和相关联的协议进行注册，密钥分发和管理，使得可以搜索和检索接收者的公钥基于收件人电子邮件地址或其他唯一标识符的互联网，从而促进不同网络域和组织中的用户之间的安全通信。

4. 发明专利

CA2327118A1 ACCESS MULTIPLEXER FOR DIGITAL SUBSCRIBER LOOPS 未知
公开(公告)号：CA2327118A1
公开(公告)日：2002-05-30
申请号：CA2327118
申请日：2000-11-30
申请人： SCHELLENBERG JAMES J , YEAP TET HIN
发明人： SCHELLENBERG JAMES J , YEAP TET HIN
IPC分类号： H04Q1/10 , H04Q1/14 , H04Q3/58 , H04Q11/04 , H04M11/06 , H04L12/66
摘要： In order to reduce complexity and equipment costs, access apparatus for connecting a plurality of DSL lines to a data network comprises a plurality of interface units connected to a plurality of DSL lines, respectively, for converting DSL signals to digital signals, or vice versa; at least one digital signal processor (DSP) unit for processing the digital signals and routing the processed signals to the data network, and for processing signals from the data network and supplying the resulting digital signals to the interface units, respectively , and a session switch for making virtual connections between respective ones of t he interface units whose associated DSL lines are active and the DSP. The session switch maintains each connection for the duration of a session. With such an arrangement, a pool of DSPs may be shared by a much larger number of DSL lines.

5. 发明专利

CA2271563A1 COMPUTER/NUMERICALLY CONTROLLED MACHINES 未知
公开(公告)号：CA2271563A1
公开(公告)日：2000-11-13
申请号：CA2271563
申请日：1999-05-13
申请人： YEAP TET HIN , LIANG MING
发明人： YEAP TET HIN , LIANG MING
IPC分类号： G05B13/02 , G05B19/416 , G05B11/01 , G05B15/02 , G05B19/18 , G05B19/402 , G05B19/404 , G05D15/01 , G05F1/66
摘要： A computer-numerically controlled material removal machine, such as a milling machine, lathe, grinding machine, shaping machine, or the like, has drive units for moving the workpiece and the cutting tool to cause the tool to remove material from the workpiece and a computer-numerical control unit for controlling the drive units so as to optimize material removal rates. In some embodiments, the control unit senses electrical energy consumption rate at a cutting tool drive motor and vanes either or both of cutting tool speed and workpiece feed rate to maintain the energy consumption rate substantially equal to a preset reference level. In other cases, the control unit derives a signal representing force exerted between the cutting tool and the workpiece, whether by sensing power or by using a dynamometer to measure force between the workpiece and the cutting tool, and controls a plurlity of variables, conveniently by means of a fuzzy logic controller.

6. 发明专利

CA2236649A1 METHOD AND APPARATUS FOR ENCODING OF DIGITAL SIGNALS FOR TRANSMISSION AND/OR STORAGE, AND DECODING SUCH ENCODED SIGNALS FOLLOWING SUCH TRANSMISSION AND/OR STORAGE 未知
公开(公告)号：CA2236649A1
公开(公告)日：1999-11-05
申请号：CA2236649
申请日：1998-05-05
申请人： YEAP TET HIN
发明人： YEAP TET HIN
IPC分类号： H04B1/66 , H04L27/00 , H04J3/18
摘要： Digital signals for transmission and/or storage are encoded by an encoder comprising an analysis filter bank for converting each digital signal into a plurality of subband signals. Some or all of the subband signals are upsampled to produce a plurality of signals each having a frequency spectrum in which segments are duplicated, each duplicate segment having a bandwidth no greater than a prescribed bandwidth of a transmission channel or storage means. The encoder selects one of the duplicates for each subband upsampled and time division multiplexes the selected duplicates to form an encoded signal for transmission or storage. Following reception/extraction, the encoded signal is decoded by a decoder which downsamples the received encoded signal at a rate that corresponds to that used by the encoder to upsample the subband signals, demultiplexes the downsampled signal to provide a plurality of received subband signals corresponding to the subband signals in the encoder, and processes the subband signals in a synthesis filter bank to form a reconstructed decoded signal corresponding to the digital input signal.

7. 发明专利

CA2311081C RFI CANCELLER USING NARROWBAND AND WIDEBAND NOISE ESTIMATORS 未知
公开(公告)号：CA2311081C
公开(公告)日：2011-12-06
申请号：CA2311081
申请日：2000-06-09
申请人： YEAP TET HIN , FENTON DAVID KENNETH
发明人： YEAP TET HIN , FENTON DAVID KENNETH
IPC分类号： H04B15/00 , H04L25/02 , H04L25/10
摘要： In order to overcome problems when using an adaptive filter for cancellation of common-mode noise in digital subscriber loops, caused by a portion of the differential signal being converted to common mode, which degrades the performance of the filter, a noise cancellation technique is proposed which compensates for this cross- coupled signal energy. In particular, a narrowband noise estimator is used to detect one or more noisy frequency bands of the common mode signal and derive therefrom a first noise estimation signal. A wideband noise estimation unit derives from the remainder of the common mode signal a second noise estimation signal. Both the first and second noise estimation signals are subtracted from the differential signal. The wideband noise estimation unit comprises a bandstop filter for removing the frequencies detected by the narrowband noise estimator, an analog-to-digital converter for converting the bandstopped signal to digital form, and an adaptive filter for deriving the second noise estimation signal from the digitized bandstopped signal and in the process compensating for phase and gain differences, especially attributable to the interference being injected at different points along the length of the channel.

8. 发明专利

CA2326948A1 NOISE/INTERFERENCE SUPPRESSION SYSTEM 未知
公开(公告)号：CA2326948A1
公开(公告)日：2002-05-24
申请号：CA2326948
申请日：2000-11-24
申请人： YEAP TET HIN
发明人： YEAP TET HIN
IPC分类号： H04L27/26 , H04Q11/04 , H04M1/19
摘要： A noise suppression circuit for a communications channel (12) comprises a noise reference extraction device (14), for example a hybrid transformer or circui t, for extracting from an input signal (S) a reference signal (N CM) corresponding to a noise component in the input signal and supplying the noise reference signal to a noise estimation unit (16) which derives therefrom a noise estimate (Y j) which is subtracted from the input signal to produce a noise-suppressed output signal (D OUT). T he noise suppression circuit comprises a first analog-to-digital converter (24) for digitizing the input signal at a first sampling rate (Fs) and a second analog-to-digital converter for sampling the noise reference signal (N CM) at a second, lower sampling rate (FS/M), the ratio (M) between the two sampling rates being an integer. A decimator (40) decimates the input signal to produce a decimated signal (D j+N j). An adaptive filter (34) produces a noise estimate signal (Y'j) that is subtracted from the decimated signal t o produce an error signal (.epsilon.j) which is used by adaptive filter (34) to adjust it s coefficients. An interpolator (36) interpolates the interim noise estimate signal (Y'j) by th e same integer (M) to provide a noise estimate signal (Y j) which is subtracted from a digitized and delayed version of the input signal to produce the noise-suppressed output signal (D OUT).

9. 发明专利

CA2205686A1 ADAPTIVE MULTIPLE SUB-BAND COMMON-MODE RFI SUPPRESSION 未知
公开(公告)号：CA2205686A1
公开(公告)日：1998-11-15
申请号：CA2205686
申请日：1997-05-15
申请人： YEAP TET HIN , LEFEBVRE PIERRE DONALD
发明人： YEAP TET HIN , LEFEBVRE PIERRE DONALD
IPC分类号： H04B1/12 , H04B15/00 , H04L25/02 , H04L25/10 , H04L27/26
摘要： A noise suppression circuit for a two-wire communications channel comprises a hybrid device, for example a hybrid transformer or circuit, for providing a diff erential output signal corresponding to a received signal in the two-wire channel. A summ ing device extracts from the two-wires of the channel a common mode signal and suppl ies it to a noise estimation unit which derives from the common mode signal an estimate of a noise level in at least one sub-band having a bandwidth considerably narrower than an operating bandwidth for the channel. An amplifier adjusts the amplitude of the noise estim ate to correspond to the residual noise in the differential output signal. It is then s ubtracted from the differential output signal. A noise detection and control unit scans the ope rating band, identifies a sub-band having an instant highest noise level, and sets the noise estimation unit to the detected sub-band. The noise estimation unit suppresses the noise in that sub-band. In preferred embodiments, the noise estimation unit comprises several channels, each comprising a tunable filter, a phase shifter and an amplifier and the noise dete ction and control unit sets the channels, in succession, to different sub-bands in descend ing order of noise level.

10. 发明专利

CA2239675C SUPPRESSION OF RFI AND IMPULSE NOISE IN COMMUNICATIONS CHANNELS 未知
公开(公告)号：CA2239675C
公开(公告)日：2007-11-13
申请号：CA2239675
申请日：1998-06-04
申请人： YEAP TET HIN
发明人： YEAP TET HIN
IPC分类号： H04B3/20 , H04B1/10 , H04B3/30 , H04L25/02 , H04L25/08 , H04L25/10 , H04M3/18
摘要： A noise suppression circuit for a two conductor communications channel comprises a hybrid device (11) coupled to the channel for providing a differential output signal corresponding to a signal received from the channel. A delay unit (12 ) coupled to the output of the hybrid device delays the differential signal by a suitable amount to allow for the generation and subtraction of a noise estimate. A summing devi ce (13) coupled to the channel extracts a digital common mode signal from the channe l, and a noise estimation unit (16) provides a common mode noise estimate signal in dependence upon a history of the common mode signal over a predetermined period of time and over a plurality of frequency bands. The common mode noise estimate signal is combined subtractively with the delayed input signal to cancel common mode noise elements of the delayed differential signal. The noise estimation unit may comprise an analysis filter bank (20) responsive to the digital common mode signal for producing a plurality of subband signals S1-S M, each at a different one of a plurality of different frequencies, a plurality of noise detection circuits (23 1-23M), each coupled to the analys is filter bank to process a respective one of the plurality of subband signals and provide a component of thecommon mode noise estimate signal, and a synthesis filter bank (24) for processing the common mode noise signal components from the plurality of noise detectio n circuits to provide the noise estimate signal. Each noise detection circuit may monit or and sum a plurality of previous samples of the corresponding subband signal, compare the sum with a predetermined threshold, select, in dependence upon said comparison, either a zero value or an instant value of the subband signal, and supply the selecte d value to a respective one of a plurality of subband inputs of the synthesis filter bank (24).

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