Did You Know...
...that while attempting to develop a super strong glue, 3M employee Spencer Silver accidentally developed a glue that was so weak it would barely hold two pieces of paper together? However, his colleague Art Fry needed the glue. Fry sang with his church choir and marked the pages of his hymnal with small scraps of paper that often fell out. He used Silver's glue to hold the papers in place. Today we call this invention Post-it Notes.
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| Number | Title | Issue Date |
| 7983310 | Methods for in-band signaling through enhanced variable-rate codecs Improvements are disclosed for in-band signaling, i.e., transmission of data in a voice channel of a digital wireless network during a voice call session. A family of narrow-band signaling methods is disclosed to successfully pass data-carrying signals through the l... | 07/19/2011 |
| 7940809 | Digital video interface with bi-directional half-duplex clock channel used as auxiliary data channel A digital video interface system and method for communicating digital video data from a source device to a sink device is provided, where the clock channel is used to transmit data as well as clock signals in a bi-directional, half-duplex manner using time division ... | 05/10/2011 |
| 7764716 | System and method for wirelessly transmitting and receiving digital data using acoustical tones A system and a method for the transmission and reception of digital data wirelessly using acoustic tones comprises a device having an encoder, a modulator system, a demodulator system, and a decoder. The modulator system uses dual tone multiple frequency (DTMF) tone... | 07/27/2010 |
| 7411984 | Method of providing tone information to nodes in a packet network Telephone tones such as dialing tones and busy or engaged tones differ in different countries and in traditional telephone networks it has been possible to deal with this because national telephone networks have been used. However, with the advent of next generation... | 08/12/2008 |
| 7400676 | Tone quality adjustment device designing method and designing device, tone quality adjustment device designing program, and tone quality adjustment device A waveform of a desired frequency characteristic is input as a numeric value string and is subjected to a reverse FFT so as to obtain a filter coefficient group. Thus, without having any expert knowledge and only by inputting a waveform of a desired frequency charac... | 07/15/2008 |
| 7313193 | Multi–tone signal transmission methods and apparatus Methods and apparatus for generating multi-tone signals, e.g., OFDM signals, are described. Analog signals corresponding to individual tones of a multi-tone signal are separately generated and filtered. Different prefixes are generated for each of the multiple tones... | 12/25/2007 |
| 7304985 | Multimedia communication management system with line status notification for key switch emulation A communication management system operates with a packet switched local area network and includes a PSTN interface for communicating over a telephone line with a service provider central office. The system comprises means for establishing a logical channel over the ... | 12/04/2007 |
| 7280604 | Space-time doppler coding schemes for time-selective wireless communication channels Space-time Doppler (STDO) coding techniques are describe for time-selective channels. In particular, a STDO coded system is capable of achieving a maximum Doppler diversity for time-selective frequency-flat channels. As demonstrated herein, this maximum diversity ma... | 10/09/2007 |
| 7260214 | Programmable subscriber line circuit partitioned into high voltage interface and digital control subsections A subscriber line interface circuit has a battery-powered, high voltage analog section, that drives tip and ring lines of a subscriber loop, and a mixed signal (low voltage and digital signal processing) section, that monitors and controls the high voltage analog se... | 08/21/2007 |
| 7230909 | Efficient activity resumption in point to multipoint service flow Orthogonal frequency division multiplexing (OFDM) is used to divide a single TDMA time slot into multiple non-contending access request opportunities that are reserved for particular subscriber units. An OFDM burst is divided into multiple tonesets where each tonese... | 06/12/2007 |
| 7228139 | Location processing system A device for determining the location of a communication device includes a network interface, a signal enhancement module, a tone decoder, and a translator. The network interface is capable of receiving a location message comprising a plurality of signal tones. The ... | 06/05/2007 |
| 7221645 | Pilot pattern design for a STTD scheme in an OFDM system The present invention relates to a transmitting device and a receiving device in a wireless orthogonal frequency division multiplex (OFDM) communication system with space time transmit diversity (STTD). Further, the present invention relates to a channel estimation ... | 05/22/2007 |
| 7206400 | Method and system for data field reuse An automatic call distribution system is adapted to connect a telephone call of a caller to an agent station through a public switched telephone network (PSTN) where call information identifiers received from the PSTN are repopulated. The method includes the steps o... | 04/17/2007 |
| 7199740 | Method and apparatus for use in switched capacitor systems A system and method including a DAC that receives a multi-bit digital signal and outputs at least two analog signals including a first analog signal and a second analog signal, the first analog signal being indicative of a sum of values of bits in the multi-bit digi... | 04/03/2007 |
| 7164719 | System to reduce distortion due to coding with a sample-by-sample quantizer A distortion removal system for reducing the quantization distortion that results from quantization of a signal by sample-by-sample quantization techniques is disclosed. The distortion removal system uses the signal previously quantized with the sample-by-sample qua... | 01/16/2007 |
| 7162553 | Correlating high-speed serial interface data and FIFO status signals in programmable logic devices Status signals that are generated by one or more FIFO buffers in a high-speed serial interface (“HSSI”) may be combined with transmitted data samples in order to correlate the status signals to the respective data samples. The combined data and status signals ma... | 01/09/2007 |
| 7151740 | Transmit power control for an OFDM-based wireless communication system An open loop power control system for an orthogonal frequency division modulation (OFDM)-based fixed/mobile wireless system. A preferred system and method comprise measuring signal strength of received interference-free pilot tones transmitted by a base station; det... | 12/19/2006 |
| 7149253 | Wireless communication A frequency division multiplexing wireless transmission on two or more antennas with the set of symbols on subcarriers of a burst transmitted by one antenna transformed into another set of symbols on the subcarriers for the corresponding burst transmitted by another... | 12/12/2006 |
| 7146172 | Multi-carrier communications with adaptive cluster configuration and switching A method and apparatus for allocating subcarriers in an orthogonal frequency division multiple access (OFDMA) system is described. In one embodiment, the method comprises allocating at least one diversity cluster of subcarriers to a first subscriber and allocating a... | 12/05/2006 |
| 7142828 | Base station for a telecommunication system The invention concerns a unit for sending from a base station to terminals in a telecommunications system, said unit comprising at least two sending channels or groups of sending channels adapted to send on a plurality of adjacent carrier frequencies, said channels ... | 11/28/2006 |
| 7142656 | Location-based ringbacks An apparatus and methods are disclosed that enable a first user of a telecommunications terminal to receive, upon placing a call to a second user, a ringback signal that is based on one or more geo-locations (e.g., the geo-location of the first user, the geo-locatio... | 11/28/2006 |
| 7139937 | Method and apparatus to establish safe state in a volatile computer memory under multiple hardware and software malfunction conditions Volatile memory is placed into a data-preserving safe state in a computer system in response to any one of a reduction in power applied to the volatile memory, a bus reset signal on a data communication bus of the computer system, and an absence of a bus clock signa... | 11/21/2006 |
| 7092440 | Hybrid spread-spectrum technique for expanding channel capacity Methods, systems and devices are described for a direct-sequence spread-spectrum communication scheme that increases the number of users by utilizing a plurality of closely spaced orthogonal carriers that produce overlapping spectra. A method includes overlapping a ... | 08/15/2006 |
| 7092383 | Method for switching on a subscriber signal, associated switching office and associated program A method for switching on a subscriber signal wherein a transmission path from a calling terminal device of a switched-through telecommunications network to a called terminal device of a packet transmission network is defined using a network transmission function. A... | 08/15/2006 |
| 7085338 | Low power, high accuracy lithium battery protection circuit A method for measuring and filtering analog signals in a battery protection algorithm is achieved. A clock signal having a fixed period is generated. Analog signals are sampled to create sampled digital signals. The sampling is synchronized with the clock signal. Th... | 08/01/2006 |
| 7012912 | Power control and scheduling in an OFDM system A system and method for power control and scheduling of sub-carriers in an OFDM communication system. The receiver dynamic range can be minimized by a power control loop that attempts to maintain received power over a noise floor in a predetermined range. If the rec... | 03/14/2006 |
| 6973523 | Code division multiple access modem interface A modem interface transfers data between a high data rate interface and a wireless interface. The modem interface has a plurality of parallel data highways. Each data highway has frames with time slots for transferring data. The plurality of highways outputs data to... | 12/06/2005 |
| 6961545 | Method and system for providing antenna diversity An antenna switch diversity algorithm, and systems and methods to provide antenna diversity by implementing the algorithm in, for example, an IEEE 802.11a compliant environment, are presented. In accordance with the algorithm, one antenna of at least two antennas is... | 11/01/2005 |
| 6959403 | Fault localization and health indication for a controller area network A node of a network comprises an error message detector arranged to detect error messages transmitted over the network, a counter arranged to count the error messages in order to produce an error message count, and a controller arranged to count valid messages in or... | 10/25/2005 |
| 6956943 | Method and apparatus for minimizing the telephony ring voltage power supply requirements of an integrated services hub The present invention discloses a method and apparatus for reducing the power required by an integrated services hub supporting a plurality of telephone circuits, comprising offsetting ringing of each of the plurality of telephone circuits such that all the telephon... | 10/18/2005 |
| 6957018 | Optical packet exchange system and optical switch An optical packet exchange apparatus and an optical switch in which search for a connection pattern between an input unit devoid of a packet to be transmitted and an output unit devoid of a packet to be received is reduced to enable fast switch control even in cases... | 10/18/2005 |
| 6940827 | Communication system using OFDM for one direction and DSSS for another direction A method and apparatus for wireless communication are described. In one embodiment, a method for communicating with a subscriber comprises transmitting orthogonal frequency domain multiplexing (OFDM) signals to the subscriber, and receiving direct-sequence spread sp... | 09/06/2005 |
| 6937557 | OFDM communication apparatus An OFDM communication apparatus comprises subcarrier selecting means for selecting subcarriers to be transmitted for each branch in accordance with the number of retransmissions of transmitting signals and transmitting means for providing TIFFT processing to transmi... | 08/30/2005 |
| 6937673 | Method of compensating frequency error in communication system and apparatus for the same Disclosed is a method of compensating a frequency error and an apparatus for the same in the communication system suitable to the frequency error compensation. The method includes the steps of despreading the signal, estimating a frequency error value by differentia... | 08/30/2005 |
| 6907027 | Radio communication system The invention relates to a radio communication system in which a time slot of a frame of a multiframe signal allocated to the frequency control channel is modulated using an 8PSK modulation scheme to contain a tone having a frequency which GMSK modulation is unsuite... | 06/14/2005 |
| 6904283 | Multi-carrier communications with group-based subcarrier allocation A method and apparatus for subcarrier selection for systems is described. In one embodiment, a method for subcarrier selection for a system employing orthogonal frequency division multiple access (OFDMA) comprises partitioning subcarriers into groups of at least one... | 06/07/2005 |
| 6895011 | Method and apparatus for re-sequencing data packets The present invention provides a method and apparatus for re-sequencing data packets received from multiple devices in a packet-based digital communication system. A set of data packets is received by a data packet sequencer. Each data packet includes an indicator o... | 05/17/2005 |
| 6807234 | Method and apparatus for constellation mapping and bitloading in multi-carrier transceivers, such as DMT-based DSL transceivers A multi-carrier transceiver, such as a DMT-based ADSL transceiver, has separate processing paths for different information types, such as voice, data, video, etc. Each processing path can include separate scrambling, interleaving, bit loading or tone ordering, and c... | 10/19/2004 |
| 6771641 | DTMF digit collection and transportation for a packet network A system and method is provided for collecting and transporting DTMF digits between two network end points in a packet network in order to preserve the integrity of the DTMF digits. The system and method use a Session Initiation Protocol (SIP), which is currently de... | 08/03/2004 |
| 6763003 | Optimized tone sending in an ATM satellite network Permanent virtual channels are set-up, each broadcasting a select audio tone of a number of audio tones. When a terminal requests a call set-up, the identification of the appropriate permanent virtual channel to which the terminal is to listen, depending on the situ... | 07/13/2004 |
