Famous Patents
In 1608, Dutch eyeglass maker Hans Lipperhey filed the first patent for a working telescope. The patent was denied.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 7999608 | Integrated RF notch filters Apparatus and methods for providing integrated RF notch filter subsystems having enhanced Q values are described. An integrated notch filter includes an LC filter element and a Q-enhancement circuit coupled to the LC filter element, with the Q-enhancement circuit co... | 08/16/2011 |
| 7990209 | Switched capacitor notch filter A switched capacitor notch filter for sampling an input signal using multiple sampling capacitors and multiple non-overlapping time periods. The charge from the sampling capacitors is averaged and transferred to the filter output during another non-overlapping time ... | 08/02/2011 |
| 7843258 | Filter circuit A plurality of low-pass filters (2-1, 2-2, 2-3) are cascaded to the post stage of an OTA (1) and a plurality of high-pass notch filters (3-1, 3-2, 3-3)... | 11/30/2010 |
| 7429889 | Control system for programmable filters Control system for programmable filters, master-slave calibration system and fully programmable high precision filter for use in such control system, such filters being provided with a filter input and a filter output including a first, first order low pass filter s... | 09/30/2008 |
| 7323955 | Narrow-band absorptive bandstop filter with multiple signal paths An absorptive bandstop filter includes at least two frequency-dependent networks, one of which constitutes a bandpass filter, that form at least two forward signal paths between an input port and an output port and whose transmission magnitude and phase characterist... | 01/29/2008 |
| 7317698 | Interference detection, identification, extraction and reporting An adaptive notch filter (ANF) module selectively filters a received wideband communication signal to eliminate narrowband interference that lies within the frequency spectrum of the wideband communication signal. To determine the presence of narrowband interference... | 01/08/2008 |
| 7313201 | Multi-range transconductor and method of operation A method for tuning a transconductor includes receiving a digital value. The method also includes determining a bit value for a selected bit of the digital value, and selecting a tuning range for a transconductor based on the bit value. The method further includes t... | 12/25/2007 |
| 7271972 | Method and apparatus for reducing seek acoustics using a variable-bandwidth low-pass filter A method and apparatus for reducing seek acoustics in a disk drive using a variable-bandwidth low-pass filter is provided. The variable-bandwidth low-pass filter is used to adaptively shape a control signal supplied to a VCM for moving a head relative to a disk surf... | 09/18/2007 |
| 7268615 | Trap filter A trap filter comprises a delay circuit made up of switched capacitors for delaying an input signal and outputting a delay signal, and an adding circuit for adding the input signal and the delay signal. ... | 09/11/2007 |
| 7245192 | Coupler with edge and broadside coupled sections Couplers are disclosed that include first and second mutually coupled conductors. The coupled conductors may be regular or irregular in configuration, and for example, may be linear, including rectilinear or with one or more curves, bends or turns, such as forming a... | 07/17/2007 |
| 7203545 | System and method for receiving telemetry data from an implantable medical device A system and method for receiving telemetry data from implantable medical devices such as cardiac pacemakers with improved noise immunity is disclosed. Ambient noise levels and signal strength are monitored and used to adaptively adjust the detection sensitivity of ... | 04/10/2007 |
| 7187142 | Motor drive with velocity noise filter A drive unit for controlling a motor includes a position feedback device and a velocity noise filter. The position feedback device is operable to generate a position signal relating to a position of the motor. The velocity noise filter is coupled to the position fee... | 03/06/2007 |
| 7164261 | Resonance-frequency measuring method determining a resonance frequency by counting the number of off-track occurrences A resonance-frequency measuring method is used for measuring a resonance frequency of an information recording/reproducing device reproducing information recorded on a medium by driving a mechanism unit. The resonance-frequency measuring method includes the measurin... | 01/16/2007 |
| 7138887 | Coupler with lateral extension A coupler is disclosed that includes first and second mutually coupled spirals or loops disposed on opposite sides of a dielectric substrate. The substrate may be formed of one or more layers and the loops may have a number of turns appropriate for a given applicati... | 11/21/2006 |
| 7127226 | Twin-T dual notch filter A communication filter circuit useful in a dual-mode receiver comprises a cascade of an active twin-T filter and a passive twin-T filter sections defining sharp notches at the center of second adjacent and of third adjacent channels, respectively, and specifically p... | 10/24/2006 |
| 7118532 | Data dependent color wall filters The present invention generally relates to ultrasound. In particular, the present invention relates to data dependent color wall filters (used in ultrasound imaging devices for example). Certain embodiments of the present invention relate to a color wall filter that... | 10/10/2006 |
| 7109670 | Motor drive with velocity-second compensation An apparatus for use with a signal generator and a motor controller includes a velocity compensator, an adjustor, and a velocity regulator. The signal generator provides a reference velocity signal, and the motor controller receives an output signal and uses the out... | 09/19/2006 |
| 7109786 | Biquad notch filter A biquad notch filter includes a first stage having first and second admittances of a first type connected between an input terminal and the control terminal of a transistor, a first current source connected between a first supply terminal and a first terminal of th... | 09/19/2006 |
| 7102699 | Radio frequency distribution network system A consumer electronic device includes circuitry configured to produce a signal corresponding to a selected one of first, second and third radio frequency channel. The circuitry includes a modulator configured to modulate the video signal such that it falls within a ... | 09/05/2006 |
| 7081788 | Band pass filter A band pass filter includes a first band pass filter constructed of a biquad circuit and having a first center frequency, and a second bandpass filter constructed of a biquad circuit and having a second center frequency different from the first center frequency, and... | 07/25/2006 |
| 7075364 | Active-RC filter with compensation to reduce Q enhancement An active filter with compensation to reduce Q-enhancement is disclosed. The filter may include a first amplifier and a second amplifier coupled to the first amplifier. The second amplifier having a negative feedback loop including a buffer having a plurality of com... | 07/11/2006 |
| 7053673 | Versatile charge sampling circuits A charge sampling circuit, having a control signal generator for controlling an analog input signal to the charge sampling circuit to be integrated by an integrator during a sampling phase responsive to a sampling signal from the control signal generator is presente... | 05/30/2006 |
| 7042309 | Phase inverter and coupler assembly A circuit assembly may include one or more coupler sections, and may include a phase inverter and/or a phase shifter. A coupler section may include a phase inverter. A coupler may include first and second mutually coupled spirals disposed on opposite sides of a diel... | 05/09/2006 |
| 7031096 | Center frequency adjustment for a notch filter Disclosed is a data storage device, a servo control method, and a program to reduce effects of a resonance frequency of an actuator or the like without reduction in servo control performance. A band-pass filter comprising a first all pass filter (APF) and a second a... | 04/18/2006 |
| 7016739 | System and method for removing narrowband noise A system and method for removing narrowband noise from an input signal in which notch filters having notch frequencies corresponding to the noise are dynamically adjusted in accordance with a detected noise spectrum. The method may be applied to telemetry systems fo... | 03/21/2006 |
| 7002417 | RC and SC filter compensation in a radio transceiver Disclosed is apparatus for operating with an RC filter (26, 26A), and a corresponding method. The apparatus includes circuitry (32) for use in measuring an actual value of at least one filter component and a controller (34), coupled to the measu... | 02/21/2006 |
| 6972639 | Bi-level coupler A coupler is disclosed that includes first and second mutually coupled spirals disposed On opposite sides of a dielectric substrate. The substrate may be formed of one or more layers and the coils may have a number of turns appropriate for a given application. Condu... | 12/06/2005 |
| 6963184 | Adaptable spatial notch filter A spatial notch filter is described that adapts in accordance with changes to an angular velocity of a rotating component within a manufacturing system. In a manufacturing system, noise may appear in feedback signals due to spatially distributed physical features in... | 11/08/2005 |
| 6943619 | Practical active capacitor filter A method and apparatus is described that filters an electrical signal. The filtering uses a capacitor multiplier circuit where the capacitor multiplier circuit uses at least one amplifier circuit and at least one capacitor. A filtered electrical signal results from ... | 09/13/2005 |
| 6930544 | Filter The object of the present invention is to obtain a high precision notch filter or all-pass filter. Therefore, two transconductance circuits for adjustment, which perform a voltage-current conversion of a difference between a voltage of a filter input terminal and a ... | 08/16/2005 |
| 6909321 | Active isolated-integrator low-pass filter with attenuation poles The present invention provides an active low-pass filter system including a low-pass filter circuit and at least one frequency-rejecting network coupled to the low-pass filter circuit. The frequency-rejecting network is included in a resistive forward signal flow br... | 06/21/2005 |
| 6904443 | Harmonic-series filter In a filtering system, a first input receives a signal contaminated with noise. A second input receives a noise reference signal. Each notch filter in a set of M notch filters is responsive to a corresponding tuning coefficient so as to attenuate a corresponding noi... | 06/07/2005 |
| 6867642 | Realtime adaptive notch compensator A notch compensation apparatus and method comprising, based on input to and output from a notch filter, dynamically calculating a desired change to a notch frequency of the notch filter and specifying the desired change to the notch filter so as to cancel an input r... | 03/15/2005 |
| 6803812 | Active filter A low pass notch filter has a notch frequency close to ωo. In the notch filter, an output of an operational amplifier is fed back to an inverting input terminal thereof through a second voltage dividing circuit and a charge/discharge resistor. A first vo... | 10/12/2004 |
| 6791401 | Continuous-time analog filter having controllable gain characteristics A Gm-C filter includes a filter passing an intended signal SI# in an input signal SI, and a control signal producing portion detecting a peak voltage value of an output signal of a filter to be controlled and a peak voltage value of the intended signal SI#, and maki... | 09/14/2004 |
| 6677815 | Second order active RC filter with imaginary zero A stop band second order active RC filter architecture that does not use a non-inverting input to receive an input signal, and that employs both positive and negative feedback to provide an RC transfer function having an imaginary zero.... | 01/13/2004 |
| 6608898 | Band pass and notch filters for echo reduction with less phase distortion A complementary comb filter includes a plurality of band pass filters and a plurality of notch filters, wherein the notch filters have the same center frequencies as the band pass filters or the same center frequencies as the dead bands defined by the ban... | 08/19/2003 |
| 6552604 | Digitally tuned analog notch filter circuit A notch filter circuit is provided including a first stage circuit and a second stage circuit. The first stage circuit sums a filter input signal with a filter output signal to form a summation signal. The second stage circuit includes a first tee network... | 04/22/2003 |
| 6507239 | Low noise and low offset bipolar input amplifiers The present invention comprises an input amplifier circuit that provides a low input offset voltage amplified output signal. Input amplifiers of the present invention include a differential pair of transistors that may be fabricated using standard CMOS pr... | 01/14/2003 |
| 6404279 | Band pass filter with improved group delay An electrical signal is applied to a band pass filter, a first notch filter, and a second notch filter in any order. The center frequencies of the notch filters straddle the pass band of the band pass filter. The notch filters improve group delay and stee... | 06/11/2002 |
