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...When G.G. Hubbard learned of his future son-in-law's invention, he called it "only a toy." His daughter was engaged to a young man named Alexander Graham Bell.
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| Number | Title | Issue Date |
| 8072207 | Device and method for measuring the frequency of a signal coded modulated carrier signal A device (10) for measuring a frequency of an input signal (IN) that is expected to comprise a carrier signal (CS) either being unmodulated (CSU) or being modulated (CSM) according to a predefined signal coding and relates to a Radio Frequency Identification ... | 12/06/2011 |
| 7936162 | Measured-signal repetition frequency detection method, and sampling apparatus and waveform observation system using the method In a method of detecting a repetition frequency of a measured signal, in order to detect the waveform repetition frequency of the measured signal with high accuracy even in the presence of a frequency fluctuation in the measured signal, the repetition frequency of t... | 05/03/2011 |
| 7365527 | System and method for extending the range of a frequency measuring device A range of a frequency measuring device having limited range is extended by pre-processing an input signal. The input signal is divided into a plurality of channels. In each channel, the input signal is divided into sub-bands. A frequency of the input signal is dete... | 04/29/2008 |
| 7355537 | Built-in self-test apparatus and method for digital-to-analog converter A built-in self-test apparatus for a digital-to-analog converter uses a differentiation unit for differentiating a digital-to-analog (DA) signal to obtain the differences between pulses of the analog signal. Next, the analog signal is converted into a digital signal... | 04/08/2008 |
| 7339509 | Sampling system using sampling apertures of different durations A signal sampling system includes an input signal and a plurality of samplers. The plurality of samplers produces a plurality of sample output signals. Each sampler from the plurality of samplers samples the input signal to produce a corresponding sample output sign... | 03/04/2008 |
| 7245671 | Preprocessing signal layers in a layered modulation digital signal system to use legacy receivers Systems and methods for receiving non-coherent layered modulation signals are presented. An exemplary apparatus comprises a tuner for receiving a layered signal and producing a layered in-phase signal and a layered quadrature signal therefrom, an analog-to-digital c... | 07/17/2007 |
| 7236900 | Three dimensional correlated data display A method and apparatus for synchronizing presentation of multi-domain measurements using actual or quasi 3-D representation. The synchronization between data streams acquired in different measurement domains is performed by using timestamps, a common trigger event, ... | 06/26/2007 |
| 7212156 | Multi-function device with positioning system and shared processor A multi-function device with a positioning function and a real time positioning engine is disclosed. The device contains also a shared processor used by the positioning function and other functions of the device, such as a mobile radio-communication function. The po... | 05/01/2007 |
| 7176670 | Method and apparatus for zero-mixing spectrum analysis with Hilbert transform An apparatus for analyzing a spectrum of an input signal (χ(t)) having at least one line with a center frequency ({circumflex over (ω)}x) at the center of the line includes: a mixer for zero-mixing the input signal (χ(t)) to produce a base band signal ... | 02/13/2007 |
| 7178048 | System and method for signal synchronization based on plural clock signals A system includes a data path that provides a data signal at a first frequency corresponding to a first clock signal. A strobe generator generates a strobe signal at the first frequency. The strobe signal is synchronized with the data signal based on a second clock ... | 02/13/2007 |
| 7173981 | Dual layer signal processing in a layered modulation digital signal system Systems and methods for receiving layered modulation for digital signals are presented. An exemplary apparatus comprises a tuner for receiving a layered signal and producing a layered in-phase signal and a layered quadrature signal therefrom, an analog-to-digital co... | 02/06/2007 |
| 7164243 | System and method for establishing motor efficiency during balanced or unbalanced operating conditions A system and method for establishing a plurality of operating parameters of a multiphase motor. The plurality of electrical parameters may be established from stator resistance data and electrical input data. The system and method may be used to decompose the electr... | 01/16/2007 |
| 7154976 | Frequency controller The invention may relate to a digital frequency adjuster for adjusting a first frequency of a first signal. The digital frequency adjuster may comprise a first digital delay line and a first control circuit. The first digital delay line may comprise a plurality of t... | 12/26/2006 |
| 7132980 | Multi-function device with positioning system and shared processor A multi-function device with a positioning function and a real time positioning engine is disclosed. The device contains also a shared processor used by the positioning function and other functions of the device, such as a mobile radio-communication function. The po... | 11/07/2006 |
| 7110898 | Method for digitally acquiring and compensating signals A method of data acquisition for a digital instrument having a bandwidth. The method includes receiving a signal and associated trigger. Using that trigger, a plurality of signal values is sampled at multiple time intervals to create an acquisition record representi... | 09/19/2006 |
| 7103489 | Active removal of aliasing frequencies in a decimating structure by changing a decimation ratio in time and space When a sample stream is decimated, frequency components from outside of a desired frequency band are aliased into the desired band, causing interference and loss of information. Different decimating ratios result in different frequencies aliasing into the desired fr... | 09/05/2006 |
| 7042959 | DSP-based variable aperture code generation technique Variable Aperture Coded (VAC) signals for VAC modulation are advantageously generated by a digital signal processor (12) that yields a VAC signal having a single narrow peak in the positive frequency region. A Discrete-Time Hilbert transformer (12) iso... | 05/09/2006 |
| 7043383 | Frequency error detection apparatus and method based on histogram information on input signals A frequency error detection apparatus and method based on histogram information of an input signal. The apparatus includes an A/D converter for and converting an analog signal into digital values; a zero crossing point detector for detecting sign changes of the digi... | 05/09/2006 |
| 7043206 | Fully integrated offset compensation feedback circuit An offset correction analogic circuit capable of compensating the offset of a digital baseband is described. The circuit comprises analog means to receive an output differential signal issued from a differential signal path. The differential signal path may be a bas... | 05/09/2006 |
| 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 |
| 6943545 | Magnetic head tester A magnetic head that includes a magnetoresistive effect read head element is tested by applying a varying magnetic field and measuring the resulting output signals from the read head element. The output signals are digitized and a processor calculates, e.g., the roo... | 09/13/2005 |
| 6922066 | Sampler and method of measuring a waveform of a current with jitters reduced In a sampler for use in measuring a waveform of an electric signal, a measurement target current is given as the electric signal to a sampler chip 11 and is also used to produce a trigger current Itr for determining measurement timing on the sampler chip. A c... | 07/26/2005 |
| 6915224 | Method for optimum spectrum analysis In a method of spectrum analysis, a sample signal, which is obtained by sampling an original signal at an original sampling rate within a sampling period, is transformed into a spectrum to be measured according to a frequency range scale. An optimum graduation inter... | 07/05/2005 |
| 6904269 | Signal type identification A method of identifying a signal type uses parameters of the signal as a basis for automatic identification. A signal of interest is selected from a display of a spectral waveform for a specified frequency. An occupied bandwidth for the signal of interest is estimat... | 06/07/2005 |
| 6856924 | Mixer-based timebase for sampling multiple input signal references asynchronous to each other Sampling is performed. A strobe signal is generated from a first signal. Multiple sampled signals are sampled using the strobe signal. Each of the multiple sampled signals is synchronous with its own clock reference and each of clock references are asynchronous with... | 02/15/2005 |
| 6700516 | Mixer-based timebase for signal sampling Signal sampling is performed. A sampler takes samples of a sampled signal. A first analog-to-digital (A/D) converter receives the samples from the sampler. A clock reference is synchronous with the sampled signal. A phase comparator produces a difference ... | 03/02/2004 |
| 6680606 | Electrical sampler for non-simultaneous sampling An electrical sampler device has a plurality of samplers for sampling an electrical signal. Each of the samplers is responsive to a corresponding sampling point. The electrical sampler device also has a propagation line coupled to each of the plurality of... | 01/20/2004 |
| 6650101 | Timebase for sampling an input signal having a synchronous trigger A timebase establishes the timing of samples acquired by a signal sampler relative to a trigger signal that is synchronous with an input signal applied to the signal sampler. The synchronous trigger activates a first pair of samplers included in the timeb... | 11/18/2003 |
| 6636823 | Method and apparatus for motor fault diagnosis A method and apparatus for detecting a stator winding fault in an induction motor includes sampling instantaneous signals from the motor and then deriving sequence components of at least some of the instantaneous signals using a power decomposition techni... | 10/21/2003 |
| 6614216 | System and method for intersample timing error reduction A system clock for a system for measuring at least one given quantity having a value which does not vary significantly from a given frequency, the system clock comprises a controller for sampling said given quantity at a rate determined by an oscillator f... | 09/02/2003 |
| 6580278 | Technique for the measurement of reflection coefficients in stored energy systems Methods and systems for measuring the reflection coefficient of a network are disclosed. The methods and systems measure the reflection coefficient by exciting a device under test with a driving signal. The driving signal incident on the device under test... | 06/17/2003 |
| 6507624 | Bandpass sampling architecture for wide-frequency band signal analysis A bandpass sampling system (10) of this invention employs a conventional mixer (14) driven by a frequency-tunable LO (16) to upconvert a signal frequency band to an IF frequency band that is above the signal frequency band. The IF frequency band is passed... | 01/14/2003 |
| 6476593 | Method and circuit for compensation control of offset voltages of a radio receiving circuit integrated in a circuit module A method and circuit for compensation control of offset voltages of a radio receiving circuit integrated in a circuit module that can be used in receiver and transceiver chips for portable mobile radio transceivers, for example in GSM or PCN/PCS systems. ... | 11/05/2002 |
| 6442506 | Spectrum analysis method and apparatus A method and apparatus for spectral analysis of a sampled signal are provided. According to the method, a first time interval ƊT is determined which represents a sample set over which the signal can be averaged for purpose of decomposing the signal into ... | 08/27/2002 |
| 6424138 | Spectrum analyzer utilizing a discontinuous signal record A high resolution cross correlation, coherent integration type spectrum analyzer for use in obtaining detailed spectral signatures of subsurface and surface vessels correlates short discontinuous records of the incoming signal with reference signals of kn... | 07/23/2002 |
| 6351729 | Multiple-window method for obtaining improved spectrograms of signals There is disclosed a method for processing a time-varying signal to produce a high-resolution spectrogram that represents power as a function of both frequency and time. Data blocks of a time series, which represents of a sampled signal, are subjected to ... | 02/26/2002 |
| 6329806 | Process for determining the harmonic oscillations of the fundamental component of an electrical signal The present invention relates to a process for determining harmonic oscillations of a fundamental component of an electrical signal, wherein the signal is sampled with a sampling frequency corresponding to a multiple of the fundamental component's frequen... | 12/11/2001 |
| 6272441 | Method for determining the pulse response of a broad band linear system and a measuring circuit for carrying out the method The invention relates to a method for the determination of the impulse response g(t) of a broad band linear system. The method can be used for the application of high frequency technology. For a test signal, a maximum length binary sequence (MLBS) is empl... | 08/07/2001 |
| 6242899 | Waveform translator for DC to 75 GHz oscillography A waveform translator in which the frequency spectrum of a repetitive non band limited input signal is translated to an equivalent frequency spectrum which is harmonically related to a fixed reference frequency. In the waveform translator a synthesized so... | 06/05/2001 |
| 6233288 | Spectrum analyzer A spectrum analyzer having an improved local oscillator for use in a digital step sweep is capable of minimizing a dynamic spurious response which is inverse proportional to a unit step time in the step sweep. The local oscillator includes a random clock ... | 05/15/2001 |
