公开(公告)号：EP0577778A4

公开(公告)日：2005-07-27

申请号：EP92917304

申请日：1992-03-26

申请人： ECHELON CORP

发明人： HURLBUT AMY O ,  RILEY GLEN M ,  SINKS ROD G

IPC分类号： G06F13/42 ,  H04L12/28 ,  H04L12/40 ,  H04L12/56

CPC分类号： H04L12/407 ,  H04L12/2803 ,  H04L12/282 ,  H04L12/2838 ,  H04L12/40006 ,  H04L12/413 ,  H04L2012/285

公开(公告)号：EP0660985A4

公开(公告)日：1998-07-08

申请号：EP93916618

申请日：1993-06-18

申请人： ECHELON CORP

发明人： HURLBUT AMY O ,  SUTTERLIN PHILIP H

IPC分类号： H04K1/04 ,  H04B1/707 ,  H04B3/54 ,  H04L7/00 ,  H04Q9/00 ,  H04K1/00

CPC分类号： H04B3/54 ,  H04B1/707 ,  H04B2203/5408 ,  H04B2203/5416

摘要： A method and means for recovering data in a spread spectrum communications system (100). The present invention includes a method and means for providing a sync window time period. The sync window is set to encompass the correlation values which are generated one baud time from the previous recovered data bit. The present invention also determines the peak correlation value within the sync window and the location in time within the sync window that the peak correlation value occurs. The present invention also provides a polarity window time period. The polarity window occurs during the sync window. The present invention decodes the data according to the direction of the peak correlation and whether the peak occurred within the polarity window. The sync and polarity windows are then set to occur, such that the peak correlation of the next baud falls within the next instance of the sync window. In this way, data can be recovered continuously.

公开(公告)号：EP0754376A4

公开(公告)日：1999-04-07

申请号：EP95915554

申请日：1995-04-05

申请人： ECHELON CORP

发明人： SUTTERLIN PHILIP H ,  DOWNEY WALTER J ,  CHUI BENJAMIN W ,  STEWART J MARCUS ,  HURLBUT AMY O

IPC分类号： H03G3/34 ,  H04B3/54 ,  H04B3/56 ,  H04B1/10

CPC分类号： H04B3/542 ,  H03G3/345 ,  H04B3/56 ,  H04B2203/5416 ,  H04B2203/545 ,  H04B2203/547

摘要： An apparatus for snubbing or blanking digital signals representing a band of signals that includes an encoded carrier signal transmitted over a power line. An average signal level (SNAVG) is compared with the instantaneous signal level to develop a blanking circuit control signal (SNGT). Additionally, snubbing occurs in the circuit (24) which determines the average signal level, to prevent noise from building up the average signal level. A hold-off signal (SNHO) is used in this circuit to prevent the average signal level (SNAVG) from being latched permanently low. A unique infinite impulse filter (17) subtracts out the D.C. offset, thereby improving the dynamic range of the blanking. Additionally, the average signal level (SNAVG) is used by AGC logic (25) to control the gain at the front end (14) of the apparatus. The state and switching of the AGC is controlled to minimize errors.

公开(公告)号：EP0692116A4

公开(公告)日：1997-07-30

申请号：EP94910757

申请日：1994-02-23

申请人： ECHELON CORP

发明人： STEWART J MARCUS ,  RILEY GLEN M ,  SUTTERLIN PHILIP H ,  ANDRUS MARIE E ,  HURLBUT AMY O ,  TORMEY MILTON T

IPC分类号： G01R31/28 ,  G01R31/42 ,  G06F11/22

CPC分类号： H04B3/546 ,  G01R31/42 ,  H04B3/48 ,  H04B3/542 ,  H04B2203/5408 ,  H04B2203/5454 ,  H04B2203/5458

摘要： A power line communications analyzer (PLCA) providing a signal strength metering system and selectable signal attenuation functions and a means for adjusting the transmitting unit's attenuation and measuring error rate without the need for a user to be present at both the sending and receiving locations under test is disclosed. Each PLCA is coupled to a power line communication network via an electrical outlet and power lines. In actual operation, one of the PLCAs acts as a data transmitter and the other PLCA acts as a data receiver. The mode of operation of the PLCA can be dynamically altered during operation of the system. The PLCA comprises control logic that receives command inputs from a keypad, generates data packets for transmission on the power line communication network, receives and analyzes data packets received from the power line communication network, detects the power line signal and/or noise level and drives the LED display accordingly, and displays packet transmission information on an LCD display.

摘要翻译： 提供信号强度测量系统和可选择的信号衰减功能的电力线通信分析器（PLCA）以及用于调整发射单元的衰减和测量误差率的装置，而不需要用户出现在被测发送和接收位置 被披露。 每个PLCA通过电源插座和电源线连接到电力线通信网络。 在实际操作中，其中一个PLCA充当数据发送器，另一个PLCA充当数据接收器。 PLCA的操作模式可以在系统运行期间动态改变。 PLCA包括控制逻辑，其从小键盘接收命令输入，生成用于在电力线通信网络上传输的数据分组，接收并分析从电力线通信网络接收到的数据分组，检测电力线信号和/或噪声电平，并且驱动 相应地显示LED，并在LCD显示器上显示分组传输信息。

公开(公告)号：EP0754379A4

公开(公告)日：2000-12-13

申请号：EP95916175

申请日：1995-03-30

申请人： ECHELON CORP

发明人： HURLBUT AMY O ,  SUTTERLIN PHILIP H ,  DOWNEY WALTER J

IPC分类号： H03M13/09 ,  H03M13/21 ,  H03M13/25 ,  H03M13/29 ,  H03M13/45 ,  H04L1/00 ,  H04L25/49 ,  H04L27/18 ,  H04L27/00

CPC分类号： H04L27/18 ,  H03M13/096 ,  H03M13/21 ,  H03M13/25 ,  H04L1/0061 ,  H04L25/4906

摘要： In a system for encoding/decoding phase modulated data, each data word (520) includes 8 data bits, a parity bit, and ends with two coding bits. A transmitted BPSK signal is demodulated into a recovered signal that is decoded using a rotating reference frame that tracks the signal phase. The signal is compared against the reference frame and the signal phase characteristics are recorded for determining a bit position of a large phase shift most likely to cause a data inversion. A single bit error detected (2310) with the parity bit is corrected (2520) by inverting the bit having the smallest measured amplitude in the recovered signal of the data word. An inversion detected (2550) by the two coding bits is corrected (2720, 2725) by inverting each successive bit starting from the position with the large phase shift. Parity is rechecked (2730), and any single bit error is corrected (2735).

公开(公告)号：EP0586554A4

公开(公告)日：1995-10-18

申请号：EP92912860

申请日：1992-05-08

申请人： ECHELON CORP

发明人： JOHNSON HOWARD W ,  SUTTERLIN PHILIP H ,  HURLBUT AMY O

IPC分类号： G06F11/10 ,  H03M13/00 ,  H03M13/15 ,  H03M13/25 ,  H04B3/54 ,  H04L1/00 ,  H04L27/18 ,  H04H1/00

CPC分类号： H04L1/0057 ,  G06F11/10 ,  H03M13/00 ,  H03M13/098 ,  H03M13/151 ,  H03M13/19 ,  H03M13/25 ,  H03M13/251 ,  H04B3/542 ,  H04B2203/5408 ,  H04B2203/5416 ,  H04B2203/5425 ,  H04B2203/5445 ,  H04B2203/5483 ,  H04B2203/5491 ,  H04B2203/5495 ,  H04L1/22

摘要： An error detection and correction method and apparatus is described which permits the correction of double errors using a (15,11) Hamming code and a parity bit. The Hamming code and parity bit allows the detection of double errors. A modulated waveform carrying the binary data is examined for anomalies such as noise pulses. A hint signal is generated based on the anomalies which points to a suspect bit. The state of this bit is changed to correct for double errors.