| Patent Number |
Title Of Patent |
Date Issued |
| 5828676 |
Method and apparatus for robust communication based upon angular modulation |
October 27, 1998 |
| A robust encoding and decoding system of the present invention for communicating binary information using angular modulation system is disclosed. Binary information to be transmitted is data words consisting of 8 data bits, a parity bit, and two additional coding bits at the end of t |
| 5812557 |
Power line communications analyzer |
September 22, 1998 |
| A power line communications analyzer (PLCA) provides a signal strength metering system and selectable signal attenuation functions 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 locati |
| 5579335 |
Split band processing for spread spectrum communications |
November 26, 1996 |
| A method and apparatus for compensating for distortion in a spread spectrum communications system particularly useful where the spread spectrum is transmitted over a power line. The information carrying signal (ICS) is split into two sub-bands and the ICS in one sub-band (or a correlatio |
| 5553081 |
Apparatus and method for detecting a signal in a communications system |
September 3, 1996 |
| In a communications system, an apparatus and method for detecting a valid signal from noise. An adaptive threshold is used to qualify a received signal. The adaptive threshold is set according to the number of false detects occurring within a given time interval. The number of false |
| 5485040 |
Powerline coupling network |
January 16, 1996 |
| An apparatus for reducing power line communication signal attenuation is disclosed. This apparatus provides for reduction of power line communication signal attenuation by balancing reactance between chosen circuit elements and the typical impedances found in a house, structure, or s |
| 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. |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 5197066 |
Collision detection circuit for communications network |
March 23, 1993 |
| A collision detection circuit which indicates to a processing node, while the node is transmitting, that another transmission has, or is occurring, on the network comprises a means for directionally coupling a processing node to the network to discriminate between the outgoing power asso |
| 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 |
| 5148144 |
Data communication network providing power and message information |
September 15, 1992 |
| A data communications network for delivering power and communications over the same cable bundle includes a plurality of communications nodes wherein associated with each of the nodes is a transformer having a core, a primary winding and a secondary winding. The secondary winding has a |
| 5109166 |
Sinusoidal signal generator |
April 28, 1992 |
| A high current CMOS circuit including a raised cosine signal generator for generating a raised cosine signal waveform and an input circuit arrangement for controlling the raised cosine signal generator is described. The raised cosine signal generator includes an output node to which |
