Did You Know...
...that to encourage use of his new invention, the shopping cart, market owner Sylvan Goldman hired fake shoppers to push the carts around his store in Oklahoma City? Seems his customers were reluctant to give up their hand-carried baskets.
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| Number | Title | Issue Date |
| 7409002 | Signal modulation According to an embodiment of the invention, a method and apparatus for signal modulation are described. According to an embodiment of the invention, a method comprises producing and transferring a modulated signal. The modulation of the signal is over a plurality o... | 08/05/2008 |
| 7359452 | Systems and methods for designing a high-precision narrowband digital filter for use in a communications system with high spectral efficiency Systems and methods for transmitting information at very high data rates through narrowband communication channels are provided. The systems and methods involve modulating a message signal with a novel return-to-zero, abrupt phase modulation technique and filtering ... | 04/15/2008 |
| 7359455 | Digital modulation and shift keying The present invention discloses an apparatus and a method of modulating a carrier with digital information having a series of datums represented in a plurality of symbols, the method comprising selecting a first number of half-periods of a first phase distinguished ... | 04/15/2008 |
| 7342971 | Bipolar waveform modulation for ultra wideband (UWB) communication networks A method for ultra wideband (UWB) communication in which UWB pulses encode binary data as either normal or inverted (anti-podal) pulses. In the case of pulses of a carrier signal, each pulse has the carrier signal either inverted or in phase, that is, shifted by 180... | 03/11/2008 |
| 7295594 | Device for low-interfernce signal transmission Digital signal transmitter devices mostly present a distinct wide-band interference spectrum which renders compliance with the presently applicable EMC standards substantially more difficult. Available provisions for improving the EMC characteristics take an ... | 11/13/2007 |
| 7142838 | Wake up device for a communications system The present invention teaches a communications system comprising a first communications device for receiving data and a wake up signal. The first communications device comprises an active mode of operation and a sleep mode of operation for reducing power consumption... | 11/28/2006 |
| 7016488 | Method and apparatus for non-linear processing of an audio signal A communication system having an echo canceller is disclosed. One embodiment of the echo canceller includes an adaptive filter used to provide an estimate of reflected echo which is removed from the send signal. The echo canceller may also include a near-end talker ... | 03/21/2006 |
| 7010056 | System and method for generating ultra wideband pulses An ultra-wide band (UWB) waveform generator and encoder for use in a UWB digital communication system. The UWB waveform is made up of a sequence of shaped wavelets. The waveform generator produces multi-amplitude, multi-phase wavelets that are time-constrained, zero... | 03/07/2006 |
| 6963696 | AC-coupled burst mode receiver with wide dynamic range An apparatus and method is disclosed for receiving packets having a wide dynamic range of power levels over a shared medium in a communications system. The receiver responds to a packet with a different power level within an inter-packet time and maintains a constan... | 11/08/2005 |
| 6947492 | Encoding and decoding ultra-wideband information A system and a method for encoding and decoding ultra-wideband information are provided. An ultra-wideband transmission is encoded by positioning bipolar pulse pairs. The bipolar pulse pairs assist in detecting errors in the ultra-wideband transmission, before the e... | 09/20/2005 |
| 6912372 | Ultra wideband signals for conveying data A method for conveying application data via carrierless ultra wideband wireless signals, and signals embodied in a carrierless ultra wideband waveform. Application data is encoded into wavelets that are transmitted as a carrierless ultra wideband waveform. The carri... | 06/28/2005 |
| 6909730 | Phase-locked loop control of passively Q-switched lasers Methods and apparatus for controlling a passively Q-switched laser (PQSL) that use a Q-switched laser as a voltage controlled oscillator (VCO) in a phase-locked loop control circuit are disclosed. The PQSL may be optically coupled to a detector. The detector may be ... | 06/21/2005 |
| 6876707 | Signal processing circuit and signal processing method A signal processing circuit generating a digital signal based on an input pulse signal is provided, which circuit includes a clock pulse output circuit which outputs clock pulses having one of positive and negative polarities for a period which includes a pulse of t... | 04/05/2005 |
| 6784817 | Data generating method, data generator, and transmitter using the same In the prior art, it has been difficult to provide a data generator and a data generating method which serve to implement an efficient transmitter, as well as a transmitter utilizing this data generator. The present invention provides a raw data generator that gener... | 08/31/2004 |
| 6778783 | Optical pulse transmission system, optical pulse transmitting method and optical pulse detecting method An optical transmission system is provided, which permits high-precision optical transmission of a signal even if the signal has a high accurate timing, an indefinite period, and a DC component. The transmitting side is provided with a rise edge detecting circuit | 08/17/2004 |
| 6748022 | Single sideband suppressed carrier digital communications method and system A method of modulating a phase reversing pulse train including a plurality of signal pulses each having an associated period of a given temporal duration to encode a multiplicity of input data bits each having a data state, and prevent losses of clock timing. The me... | 06/08/2004 |
| 6522707 | Method and device for disturbance suppression in a signal Disturbances in bipolar signals transmitted on a transmission line are suppressed by adjusting the amplitude of the signals with coarse adjustment steps and with fine adjustment steps. The amplitude adjusted signals are compared to at least a lower refere... | 02/18/2003 |
| 6466627 | Pulse signal transmitting circuit and subscriber's line terminal apparatus using the pulse signal transmitting circuit A pulse signal transmitting circuit generates a pulse signal having an enhanced high-frequency component with a reduced power loss. A pulse signal is transmitted to a load circuit through a transmission cable connected to a secondary winding of a transfor... | 10/15/2002 |
| 6445476 | Transmission and reception of duobinary multilevel pulse-amplitude-modulated optical signals using subsequence-based encoder Methods and apparatus to transmit and receive information bits encoded in duobinary, multilevel pulse-amplitude-modulated (PAM) optical signals are described. The transmitted optical signal has a narrow optical spectrum and a low symbol rate. Information ... | 09/03/2002 |
| 6256353 | Method and apparatus for generating a probing signal for a system having non-linear network and codec distortion The present invention provides a method of generating a signal that may be used to determine the characteristic response of a communication channel that utilizes the public Digital Telephone Network (DTN). The channel includes the DTN, which may have Netw... | 07/03/2001 |
| 6243426 | Apparatus and method for slew rate control of MLT-3 transmitter using zero drive A transmitter within a line driver circuit is configured to supply data signals in compliance with the Multilevel Transmission-3 (MLT-3) protocol for high speed data communication. The transmitter comprises a pre-driver system and a final driver. The pre-... | 06/05/2001 |
| 6185262 | Method for suppressing disturbances in a bipolar data stream and a circuit configuration for carrying out the method Disturbances in a bipolar signal in the case of large line lengths are suppressed. The signal is led to a coarse setting and a fine setting in an equalizer and to a downstream level detector. From there it is fed back to the equalizer via a control device... | 02/06/2001 |
| 6078627 | Circuit and method for multilevel signal decoding, descrambling, and error detection At least two level detectors compare a multilevel signal to respective prescribed voltage levels to produce corresponding streams of bits. These bit streams are repeatedly delayed in respective digital delay lines, and bits from the digital delay lines ar... | 06/20/2000 |
| 6049571 | Encoding circuit with a function of zero continuous-suppression in a data transmission system An encoding circuit with a function of zero continuous-suppression in a data transmission system according to the present invention includes an EXZ detecting unit, a NRZ pulse generating unit and an output control unit. The EXZ detecting unit receives ser... | 04/11/2000 |
| 5978390 | Dual DDS data multiplexer A method and apparatus 200 for converting dual 4-wire digital data services (DDS-1 and DDS-2) for transmission over a single twisted pair telephone line 205. The present method includes use of a digital data service remote terminal 219 and a digital data ... | 11/02/1999 |
| 5969646 | Apparatus and method for decoding differential multi-level data with adaptive threshold control An improved decoder for recovering Non-Return-to-Zero Interface (NRZI) digital data from a multiple layer transition (MLT-3) encoded signal in a 100BASE-TX Ethernet (IEEE Standard 802.3u) uses multiple comparators to minimize jitter in the decoded signal.... | 10/19/1999 |
| 5946355 | Serial-digital receiver An improved serial-digital data receiver that receives a scrambled NRZI voltage signal representing a transmitted serial-digital data signal converts the scrambled NRZI voltage signal in the analog domain to a bi-polar or pseudo-ternary voltage signal. Th... | 08/31/1999 |
| 5867534 | Optical transmission method with reduced sensitivity to dispersion, transmission device and system for implementing this method An optical transmission method and device consisting of coding a binary data pattern (SI) to be transmitted in the form of a second binary signal (SM), by differential coding; filtering the second binary signal (SM) to obtain a duobinary signal (SMF havin... | 02/02/1999 |
| 5838731 | Burst-mode digital receiver A burst-mode digital receiver which minimizes any reduction in the minimum input level as compared with a continuous-signal digital receiver includes a unipolar code-to-bipolar code converter for converging unipolar code pulses of an inputted burst signal... | 11/17/1998 |
| 5832033 | Clock disturbance detection based on ratio of main clock and subclock periods A bipolar-clock monitor circuit includes a first shift register shifting positive-polarity pulse signal according to the negative-polarity pulse signal to produce a i-bit-shift signal and a j-bit-shift signal. The integers i and j are determined based on ... | 11/03/1998 |
| 5793262 | Build-out network for a built-in type balanced line driver circuit A build-out Network (BON) built-in type balanced line driver circuit is provided. The (BON) built-in type balanced line driver circuit comprises a pair of transistors, the emitters of which are connected in common, and an impedance circuit connected betwe... | 08/11/1998 |
| 5786918 | Optical communication system and optical transmitting device An optical communication system of a construction wherein the average wavelength dispersion value of the transmission optical fiber used, the optical output intensity of each optical amplifier repeater inserted in the transmission optical fiber and the wi... | 07/28/1998 |
| 5748902 | Polarity switched data bus for reduced electromagnetic interference In a data bus with m data bits, electromagnetic interference is produced by polarity switching the data on that data bus. When two consecutive data items result in a change of over half of the data bits, the polarity of the second data item is switched, a... | 05/05/1998 |
| 5737366 | Method and apparatus for receiving line encoded bursts of information An apparatus and method for receiving line encoded bursts of information removes unwanted background light and has a maximum inter-packet idle time of only one bit between bursts. The invention permits the use of AC coupling in a receiver and results in o... | 04/07/1998 |
| 5734682 | Method for increasing transmission rate The off-state of the binary transitions is used in order to possibly generate symmetrical transitions of the active state of the binary transitions in relation to the off-state, in order to replace the two-state logic of at least one binary transition cap... | 03/31/1998 |
| 5668814 | Dual DDS data multiplexer A method and apparatus 200 for converting dual 4-wire digital data services (DDS-1 and DDS-2) for transmission over a single twisted pair telephone line 205. The present method includes use of a digital data service remote terminal 219 and a digital data ... | 09/16/1997 |
| 5640433 | Conversion of synchronous/asynchronous signals A processor controlled test set is disclosed for testing special service circuits of a telecommunication system. A microprocessor controls the overall operation of the test set, while a digital signal processor provides high speed timing signals to the va... | 06/17/1997 |
| 5631928 | Enhanced B3ZS decoder and method for identifying true zero-substitutions An enhanced B3ZS decoder which substantially improves error-multiplication performance is disclosed. A string of four bits is examined to detect whether it satisfies two specific criteria. The first criterion is that every valid zero-substitution pattern ... | 05/20/1997 |
| 5625645 | Differential pulse encoding and decoding for binary data transmissions A differential pulse encoding and decoding approach for binary data transmissions, such as binary frequency shift keying (BFSK) data transmissions, for sending and recovering a serial, binary digital data stream by differentiating the pulses thereof. A me... | 04/29/1997 |
| 5612956 | Reformatting of variable rate data for fixed rate communication Variable rate data is reformatted for communication to an external device at a fixed rate. Fixed length packets of the variable rate data are recovered from a multiplex of data packets. A packet start byte is added to the beginning of each of the recovere... | 03/18/1997 |
