| Patent Number |
Title Of Patent |
Date Issued |
| 5471209 |
Sigma-delta converter having a digital logic gate core |
November 28, 1995 |
| A sigma-delta A/D converter having a digital logic gate core. The converter is comprised of a loop filter for shaping the converter's quantization noise spectrum. The loop filter is comprised of an unbuffered CMOS logic gate inverter which can be implemented by a gate array. A quantizer |
| 5463662 |
Apparatus and method for reducing errors in data caused by noise through use of blanking |
October 31, 1995 |
| 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 is compared with the instantaneous signal level to develop a blanking circuit control signal. Additionally, |
| 5461629 |
Error correction in a spread spectrum transceiver |
October 24, 1995 |
| An improved transceiver for power line communication using a spread spectrum signal. The amount of correlation for each bit in a word is determined. If a parity error occurs, the state of the bit with the weakest correlation is changed. |
| 5454008 |
Method and apparatus for interfacing between a twisted pair and an intelligent cell |
September 26, 1995 |
| A transceiver module for coupling between cells in a distributed intelligence network and a twisted pair line. The module receives power from the line and provides power to its respective cell. At the end of transmitting a packet, the transceiver transmits a code violation, then an a |
| 5424710 |
Power coupler for coupling power from a transmission line to a node thereon |
June 13, 1995 |
| A node power isolator for connecting a node of a two conductor transmission line network such as a twisted pair line to the network so as to enable the DC powering of the node from the network itself without significantly diminishing the signal levels on the network or interfering with t |
| 5420572 |
Configuration device for use in a networked communication system |
May 30, 1995 |
| An apparatus useful in the configuration of communication network. The present invention provides for improved apparatus and techniques for configuration of network nodes. In particular, what is described is a device which may be coupled with each node of a network. When coupled to a |
| 5408497 |
Transceiver for transmitting and receiving stair-stepped sinusoidal waveforms |
April 18, 1995 |
| A transceiver for transmitting and receiving digital data represented as stair-stepped sinusoidal waveforms over twisted pair lines interconnecting nodes of a network. The transmitter of the transceiver converts square waves into the stair stepped sinusoidal waveforms by utilizing a numb |
| 5404127 |
Power line communication while avoiding determinable interference harmonics |
April 4, 1995 |
| A power line communication (PLC) apparatus wherein a carrier is derived to avoid determinable interference harmonics. In order to transmit data on a power line containing the television interference or other determinable interference harmonics, the present invention uses redundant carrie |
| 5391932 |
Source power coupler |
February 21, 1995 |
| A transistorized source power coupler for coupling a power source to a pair of transmission lines. DC power from the power source is conducted by the transistorized source power coupler to the transmission lines. Meanwhile, AC signals on the transmission lines are isolated from the power |
| 5377227 |
Adaptive data recovery for spread spectrum systems |
December 27, 1994 |
| A method and means for for recovering data in a spread spectrum communications system. 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 prev |
| 5357541 |
Transceiver providing selectable frequencies and spreading sequences |
October 18, 1994 |
| A transceiver for transmitting and receiving digital data is disclosed. The transceiver employs direct sequence spread spectrum communications techniques for reducing interference among multiple users in a communications network environment. Each transceiver has a transmitter for loc |
| 5355114 |
Reconstruction of signals using redundant channels |
October 11, 1994 |
| In a power line communication apparatus, data is redundantly transmitted on a first and a second carrier where the carriers are separated by a predetermined number of Hz. In the receiver two channels are used, one for each of the carriers. The noise level in each channel is independently |
| 5347549 |
Method and apparatus for interfacing between a twisted pair and an intelligent cell |
September 13, 1994 |
| A transceiver module for coupling between cells in a distributed intelligence network and a twisted pair line. The module receives power from the line and provides power to its respective cell. At the end of transmitting a packet, the transceiver transmits a code violation (pulse), t |
| 5327426 |
Method and apparatus for preventing unnecessary retransmission of messages in a networked messag |
July 5, 1994 |
| An improved apparatus and method for routing of messages in a networked system wherein reduced unnecessary retransmission of messages across routers is achieved by examining the address of the source of messages to be forwarded and, if the source of the message is on the transmit side of |
| 5289498 |
Adaptive data recovery for spread spectrum systems |
February 22, 1994 |
| A method and means for for recovering data in a spread spectrum communications system. 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 prev |
| 5289476 |
Transmission mode detection in a modulated communication system |
February 22, 1994 |
| A power line communication (PLC) apparatus wherein transmission mode information is encoded into each data packet while maintaining immunity from single bit errors. In the present invention, a power line communication system includes a transmitter/receiver (i.e. transceiver) which is |
| 5263050 |
Adaptive threshold in a spread spectrum communications system |
November 16, 1993 |
| A transceiver for transmitting and receiving spread spectrum signals having an adaptive threshold for distinguishing between valid receive data signals and noise. The transceiver includes a transmitter for transmitting spread spectrum signals and a receiver for receiving spread spectrum |
| 5260974 |
Adaptive carrier detection |
November 9, 1993 |
| An improvement in an apparatus which uses a carrier detection threshold level for detecting a carrier signal modulated with binary data. The threshold level is dynamically changed and generally seeks a level above the background noise. The threshold level is maintained constant when the |
| 5257006 |
Method and apparatus for power line communications |
October 26, 1993 |
| A method and apparatus for power line communications which utilizes common mode transmission and reception of communication signals over power lines. The communication signals are sent and received between the power and neutral lines, and the ground line. A common mode choke in the power |
| 5249270 |
Development system protocol |
September 28, 1993 |
| The present invention works in combination with an integrated set of hardware and software tools that support rapid design, programming, debugging, implementation, and testing of local operation network local operation network nodes and applications. These hardware and software tools |
| 5241283 |
Drive amplifier for power line communications |
August 31, 1993 |
| A power line communication amplifier circuit for providing a signal transmission across a power line medium when operating in a transmit mode, and for providing a relatively high input impedance to the power line when in a receive mode includes a unity gain buffer integrally coupled with |
| 5239686 |
Transceiver with rapid mode switching capability |
August 24, 1993 |
| An RF transceiver achieves a fast switching time between transmit and receive modes by leaving the transmit oscillator on all the time. The transmit chain comprises a wide pulling voltage controlled crystal oscillator that operates at one third the transmit frequency followed by a fr |
| 5210518 |
Apparatus and method for reducing errors in data caused by noise |
May 11, 1993 |
| In a power line communications apparatus an improvement for blanking or snubbing impulse noise. The impulse noise is detected and used to snub the detected signal. The duration of the snubbing pulses is controlled to assure complete blanking of noise including the trailing noise signals |
| 5206657 |
Printed circuit radio frequency antenna |
April 27, 1993 |
| A radio frequency antenna comprises a pair of double-sided printed circuit boards that are etched on each side to form conductive loops around the periphery of each board. The circuit boards are spaced apart by standoffs and the loops are electrically coupled in series. An impedance matc |
| 5203003 |
Computer architecture for conserving power by using shared resources and method for suspending p |
April 13, 1993 |
| A computer architecture and method capable of retaining data after a system clock has been halted to conserve power. The computer comprises first processing circuitry, the first circuitry comprising dynamic components. The dynamic components include such devices as intermediate pipeline |
| 5195098 |
Binary data error correction using hint signal |
March 16, 1993 |
| 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 examine |
| 5192231 |
Power line communications coupler |
March 9, 1993 |
| A coupler for providing coupling for power line communications between the power lines carrying different phases of the power. The coupler engages an ordinary wall outlet such as 220 volt outlet and includes a receptacle for a 220 volt plug. Internally, the adaptor has high frequency cou |
| 5189683 |
Transceiver providing selectable frequencies and spreading sequences |
February 23, 1993 |
| A transceiver the transmitting and receiving digital data is disclosed. The transceiver employs direct sequence spread spectrum communications techniques for reducing interference among multiple users in a communications network environment. Each transceiver has a transmitter for loc |
| 5113498 |
Input/output section for an intelligent cell which provides sensing, bidirectional communication |
May 12, 1992 |
| A network for providing sensing, communications and control is described. A plurality of intelligent cells each of which comprises an integrated circuit having a processor and input/output section are coupled to the network. Each of the programmable cells receives when manufactured a |
| 5034882 |
Multiprocessor intelligent cell for a network which provides sensing, bidirectional communicatio |
July 23, 1991 |
| A processor is described which is particularly useful in a cell which cell forms part of a network for sensing, communicating and controlling. The processor includes a plurality of sets of registers, each associated with a different processor. Each set of registers shares a single ALU. D |
