Did You Know...
...that the Slinky toy was the result of a failed attempt by engineer Richard James to produce an antivibration device for ship instruments? His goal was to develop a spring that would instantaneously counterbalance the wave motion that rocks a ship at sea. Instead, he developed the Slinky.
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| Number | Title | Issue Date |
| 7640282 | Matched filtering A signal is filtered by multiplying its Fourier transform by the Fourier transform of a reference sequence to which the filtering is to be matched. The reference sequence (e.g. a Golay sequence pair) is defined as an iterative combination of shorter sequences and it... | 12/29/2009 |
| 7418065 | Multicarrier receivers and methods for detecting cyclic prefixes having unknown lengths A multicarrier receiver sequentially correlates two training symbols to determine a length of a cyclic prefix associated with each of the training symbols. ... | 08/26/2008 |
| 7340019 | Programmable filter Briefly, in accordance with one embodiment of the invention, a programmable filter may implement an infinite impulse response filter so that a transceiver in which the filter is utilized may be programmable to operate in one or more modes in accordance with one or m... | 03/04/2008 |
| 7330522 | Complementary code keying (CCK) sequentially decoding apparatus and process thereof An apparatus of sequentially decoding CCK codes includes a series of received signal registers used to respectively temporarily save the received signals, a phase selector used to select one numeral from 1, −1, j or −j respectively for CCK code of each chip to m... | 02/12/2008 |
| 7321882 | Method for supervised teaching of a recurrent artificial neural network A method for the supervised teaching of a recurrent neutral network (RNN) is disclosed. A typical embodiment of the method utilizes a large (50 units or more), randomly initialized RNN with a globally stable dynamics. During the training period, the output units of ... | 01/22/2008 |
| 7295624 | Wireless system with hybrid automatic retransmission request in interference-limited communications A wireless receiver for receiving signals from an interference-limited transmitter in an interference-limited system comprising at least one transmit antenna, wherein the signals comprise a plurality of symbols. The receiver comprises a plurality of receive antennas... | 11/13/2007 |
| 7233969 | Method and apparatus for a parallel correlator and applications thereof A fast correlator transform (FCT) algorithm and methods and systems for implementing same, correlate an encoded data word (X0–XM−) with encoding coefficients (C0–CM−1), wherein each of (X0–XM−1 | 06/19/2007 |
| 7161528 | Device and method for the suppression of pulsed wireless signals The invention relates to a method of suppressing pulsed signals in particular of DME or TACAN type present in the radio signals received (Ue) by a radio-frequency receiver, characterized in that the reception frequency band of the receiver is divided into frequency ... | 01/09/2007 |
| 7129868 | Sample rate converting device and method A sample rate converting device includes a noise shaper and a sample rate converter. The noise shaper is for receiving a digital input signal, noise-shaping the digital input signal, and then outputting an n-bit digital stream. The sample rate converter, which is co... | 10/31/2006 |
| 7092382 | Method for improving the quality of an audio transmission via a packet-oriented communication network and communication system for implementing the method The invention permits the improvement of the quality of an audio transmission in which audio data including samples of an audio signal are asynchronously transmitted in data packets via a packet-oriented communication network, such as a LAN. According to the inventi... | 08/15/2006 |
| 7042928 | Method and apparatus for pilot estimation using prediction error method A system is disclosed for use in a wireless communication system to provide an estimated pilot signal. The system includes a receiver and a front-end processing and despreading component in electronic communication with the receiver for despreading a CDMA signal. A ... | 05/09/2006 |
| 7039091 | Method and apparatus for implementing a two dimensional correlator A method for managing a code sequence according to a first embodiment of the present invention is disclosed. Sets of n contiguous sample values that include sample values in a plurality of sample sequences are accessed. Sets of n contiguous coefficients are accessed... | 05/02/2006 |
| 7010559 | Method and apparatus for a parallel correlator and applications thereof A fast correlator transform (FCT) algorithm and methods and systems for implementing same, correlate an encoded data word (X0-XM-1) with encoding coefficients (C0-CM-1), wherein each of (X0-XM-1) is r... | 03/07/2006 |
| 6993065 | Multi-channel spread spectrum system A multi-channel spread-spectrum system separates a data stream, for example from a convolutional encoder and an interleaver, into sub-channel data-sequence signals. For each sub-channel data-sequence signal, m bits are translated to one code of a unique set of ortho... | 01/31/2006 |
| 6959030 | Method and apparatus for generating an interleaved code An interleaved coding method can be used in a transmitter, in which the two or more pseudonoise (PN) codes are interleaved to form a longer interleaved code. The method can be used in a transmitter that includes a first code generator generating a first code of n sy... | 10/25/2005 |
| 6868109 | Space hopping receiving system and received radio-waves estimation method A receiving system or a received radio-wave estimation method is provided that can maintain received field strengths at a nearly uniform level under multipath conditions. The antenna switch can select outputs of four antennas at high speed. The high-frequency amplif... | 03/15/2005 |
| 6862323 | Low pass filters for high dynamic range wideband direct conversion receiver Disclosed are a low pass filter, and a direct conversion receiver (DCR) implementing the same, which filter and second signal channels with improved phase and gain match, allowing use of the filter and DCR in wideband environments. A first M-pole filter channel, com... | 03/01/2005 |
| 6816621 | Method for generating shift-invariant filters A novel method is presented for implementing a filter for processing a discrete signal having the steps of first obtaining a plurality of sample values from the discrete signal; then using each sample value to retrieve a bit vector from a plurality of tables. Afterw... | 11/09/2004 |
| 6775684 | Digital matched filter A digital matched filter has a serial-to-parallel conversion circuit that converts input data fed thereto in serial form into n sets of parallel data and a plurality of delay circuits that each output serial data fed thereto with a delay corresponding to n sets of d... | 08/10/2004 |
| 6772182 | Signal processing method for improving the signal-to-noise ratio of a noise-dominated channel and a matched-phase noise filter for implementing the same A matched-phase noise filter includes an analog to digital converter (ADC) for receiving an analog composite, noise-dominated signal containing a signal of interest and producing a digital composite signal, an input/output port receiving the digital composite signal... | 08/03/2004 |
| 6700490 | Digital detection filters for electronic article surveillance Digital implementation of electronic article surveillance (EAS) detection filtering for pulsed EAS systems is provided. Embodiments include direct implementation as a quadrature matched filter bank, as an envelope detector, a correlation receiver, and as ... | 03/02/2004 |
| 6516020 | Correlator and despreading code switching method Despreading codes are switched at effective timings to perform despreading calculations by providing a rate difference between the first clock signal to input a spread signal to be subjected to the correlation detection to a data holding section and the s... | 02/04/2003 |
| 6512785 | Matched filter bank A matched filter bank including a plurality of matched filters and a sampling and holding units commonly used by the total matched filters. Therefore, the circuit size is diminished. An inverting amplifier for the matched filter with a variable gain includes ... | 01/28/2003 |
| 6456646 | Methods and systems for detecting codewords with intersymbol interference and imperfect timing Methods and systems are provided whereby correlations between a received signal sample set and a plurality of potential codeword data set are determined and a potential codeword with the highest correlation value is selected as the decoded codeword. The c... | 09/24/2002 |
| 6445756 | Peak detecting circuit for detecting a peak of a time discrete signal by an approximate function A peak detecting circuit capable of accurately detecting a peak of a time discrete signal without increasing a circuit scale. The peak detecting circuit detects a peak of a waveform of a time discrete signal by calculating an approximate function which ap... | 09/03/2002 |
| 6366938 | Reduced power matched filter using precomputation A technique for correlating a sequence of signal sample values with a predetermined digital code to produce correlation values for shifts in the sequence of signal sample values relative to the predetermined digital code is disclosed. The technique is rea... | 04/02/2002 |
| 6363108 | Programmable matched filter searcher A novel and improved method and apparatus for searching is described. Channel data is despread utilizing a matched filter structure. The in-phase and quadrature amplitudes of the despreading delivered to coherent accumulators to sum for a programmable dur... | 03/26/2002 |
| 6304591 | Match filter architecture based upon parallel I/O The present invention is a match filter architecture that is used in the Spread ALOHA Multiple Access (SAMA) receiver to facilitate the separation of individual user's data from the incoming SAMA sample "chip" stream. The filter outputs the convolution of... | 10/16/2001 |
| 6226049 | NTSC rejection filter A receiver including an NTSC rejection filter for eliminating interference signals from a high definition signal. The ratio of the energy of an expected high definition signal to the energy of an NTSC signal is determined. An NTSC signal sequence is gener... | 05/01/2001 |
| 6154483 | Coherent detection using matched filter enhanced spread spectrum demodulation A spread-spectrum-phase-locked-loop apparatus and method for coherent detection without a pilot channel. The system comprises symbol-matched means, a voltage-controlled oscillator (VCO), a first product device, a second product device, a third product dev... | 11/28/2000 |
| 6044105 | Doppler corrected spread spectrum matched filter A method and apparatus for a spread spectrum matched filter with Doppler correction suitable for using in a radio frequency receiver. A principal idea of the invention is to reduce a waveform representing Doppler correction values into a simple Boolean co... | 03/28/2000 |
| 6038273 | Reduction of numeric counting levels in resampling A method and system in which the numeric values to which counters in resampling control circuitry may be reduced. As a result, smaller registers to hold such reduced numeric values may be designed into hardware implementing said circuitry. These smaller r... | 03/14/2000 |
| 6021419 | System for filtering broadcast digital information in accordance with channel identifiers stored in preference list which can be dynamically updated via command through network A filter adaptor connects a computer to a network through a network connection. The network has a large plurality of broadcast type messages having a given protocol. Each of the broadcast messages has a destination field and a source field. The adaptor ha... | 02/01/2000 |
| 5980097 | Reduced complexity signal converter In a signal converter which derives from an input signal having a sample rate R/q an output signal having a larger sample rate R, the input signal is combined with a feedback signal in a subtracter to form a single combined signal. Samples of the combined... | 11/09/1999 |
| 5966684 | Method and apparatus for cancelling periodic electrical interference A system involving method and apparatus for cancelling a periodic electrical interference signal from a signal of interest is disclosed. The system of the invention creates an estimate of the periodic noise component in an electrical signal by sampling th... | 10/12/1999 |
| 5960033 | Matched filter A sample-hold circuit, which is constituted by a capacitor and a differential amplifier or a capacitor and an inversion amplifier, is provided with a first switch for short-circuiting the input and output, a second switch for switching the input-side term... | 09/28/1999 |
| 5928313 | Method and apparatus for sample rate conversion An improved apparatus and method for performing sample rate conversion of digital sample values is disclosed. The sample rate conversion utilizes a finite impulse response filter that substantially eliminates the introduction of phase errors that plague c... | 07/27/1999 |
| 5914987 | Method of recovering symbols of a digitally modulated radio signal A method of recovering a finite duration of N symbols of a digitally-modulated signal, wherein a received signal is sampled at a period T1, generating a batch of K1 samples, wherein K1 is chosen to be an integer multiple o... | 06/22/1999 |
| 5887025 | Matched filter acting in charge domain A charge mode operation circuit dedicated to detect the correlation between analog input signal and digital code, and for realizing by "RAKE method" the path diversity reception from the correlation data obtained using the same. The circuit utilizes an an... | 03/23/1999 |
| 5887024 | Matched filter The present invention provides a matched filter which can refresh an entire while keeping the speed of a calculation comparable to a small sized circuit. The first and second addition circuits of a matched filter of the present invention are classified in... | 03/23/1999 |
