Did You Know...
...that power steering was invented by independent inventor Francis W. Davis? As chief engineer in the 1920s of the truck division of the Pierce Arrow Motor Car Company, he saw how hard it was to steer heavy vehicles. So that he would be able to keep the profits from his future invention, Davis left his job, rented a small engineering shop in Waltham, Mass., and developed a hydraulic power steering system that led to power steering.
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| Number | Title | Issue Date |
| 8102171 | Measuring device and measuring method for measuring the envelope power and the mean-power value A measuring device for measuring the envelope power and the mean-power value of a high-frequency signal. The measuring device includes a detector for detecting the high-frequency signal and for generating an analog detector signal, an analog/digital converter for ge... | 01/24/2012 |
| 8072206 | Spectrum analyzer system and spectrum analyze method Provided is a spectrum analysis system that measures a signal component at each frequency of an input signal, comprising a sampling section that samples the input signal at prescribed bandwidths to digitize the input signal, and outputs a resulting digital output si... | 12/06/2011 |
| 7952344 | Frequency characteristic measuring apparatus A frequency characteristic measuring apparatus measures a device under test in which the frequency of an input signal and the frequency of an output signal differ from each other, simplifying the configuration of a tracking generator and peripheral circuits associat... | 05/31/2011 |
| 7791329 | Vector/signal analyzer equalization apparatus and method Disclosed is a method of equalization of a vector/signal analyzer including: providing a structured test signal within a selected frequency range. The structured test signal includes a plurality of frequency components each having a respective amplitude and phase. T... | 09/07/2010 |
| 7786718 | Time measurement of periodic signals A system for measuring the time interval of a signal. The second signal has a frequency higher than a frequency of the first signal. According to one embodiment, the system includes an electronic circuit for determining an approximation of the time based on a period... | 08/31/2010 |
| 7768252 | Systems and methods for determining sensing thresholds of a multi-resolution spectrum sensing (MRSS) technique for cognitive radio (CR) systems Systems and methods may be provided for threshold determinations for spectrum sensing. The systems and methods may include receiving a false alarm rate, where the false alarm rate is associated with false occupancy identifications of a spectrum segment, determining ... | 08/03/2010 |
| 7759925 | Signal analyzer and method for signal analysis A signal analyzer repetitively memorizes waveform data of a signal under test to detect peaks P1-P6 of the waveform data. Waveform widths of the waveform data at a mask reference level, or a predetermined level down from the respective peaks, are evalu... | 07/20/2010 |
| 7746052 | Apparatus for extending the bandwidth of a spectrum analyzer A spectrum analyzer is provided with frequency-scalable circuit architectures that extend the bandwidth of the spectrum analyzer using an array of couplers. The array of couplers is distributed along the RF signal path at one end, and interfaced to one or more frequ... | 06/29/2010 |
| 7741830 | Image cancellation in frequency converters for spectrum analysers The process eliminates image rays generated in a frequency converting device generating actual rays and image rays from frequency rays of an input signal. The frequency converting device comprising a mixer mixing the input signal and a signal provided by a local osc... | 06/22/2010 |
| 7701194 | Methods and system for detecting DC output levels in an audio system A system for detecting a direct current (DC) component of a pulse-width modulated (PWM) signal includes a modulator configured to provide at least one PWM signal to an input of an amplifier. A DC detector is configured to detect a DC component of a selected one of t... | 04/20/2010 |
| 7688058 | Integrated spectrum analyzer circuits and methods for providing on-chip diagnostics Spectrum analyzer circuits and methods are provided which implement “zero-IF” (direct conversion) or “near-zero IF” (or very low IF) architectures that enable implementation of integrated (on-chip) spectrum analyzers for measuring the frequency spectrum of i... | 03/30/2010 |
| 7612551 | System of phonon spectroscopy A system for phonon spectroscopy for attaining a phonon spectrum of a sample of a material. Current may be injected into the material to result in electrical noise in the material. The electrical noise may be processed to result in information revealing a phonon spe... | 11/03/2009 |
| 7592795 | Measurement of distortion in an amplifier Parametric measurement of first- and second-generation telecommunications equipment has been relatively straightforward. The evolution to more complex transmission schemes such as those proposed for third-generation (3G) telecommunications devices can employ the sub... | 09/22/2009 |
| 7501807 | Spectrum analyzer having a resolution filter that can be adjusted via phase-variation parameter A spectrum analyzer is described which comprises a mixer for mixing the conjugate complex input signal v*(t) into a base band signal x(t), and a resolution filter for narrow-band filtering the base band signal. The resolution filter has a complex, discrete impulse r... | 03/10/2009 |
| 7459898 | System and apparatus for detecting and analyzing a frequency spectrum An apparatus comprising a housing, a circuit board disposed within the housing, the circuit board further comprising a radio, a processing device, a memory, and a connector suitable for connecting with a port of a computing device. The circuit board is a small form ... | 12/02/2008 |
| 7456626 | Measurement device and method for displaying measurement result A measurement device is provided for measuring a predetermined physical quantity which is contained in the measurement signal over a predetermined measurement range which relates to a specific property for the physical quantity according to the measurement signal wh... | 11/25/2008 |
| 7449876 | Swept-frequency measurements with improved speed using synthetic instruments A synthetic test system for swept-frequency measurements that has a clock synchronization device to enable test boxes and devices that form the synthetic test system to have a common sense of time when conducting swept-frequency tests. ... | 11/11/2008 |
| 7446523 | Integrated spectrum analyzer circuits and methods for providing on-chip diagnostics Spectrum analyzer circuits and methods are provided which implement “zero-IF” (direct conversion) or “near-zero IF” (or very low IF) architectures that enable implementation of integrated (on-chip) spectrum analyzers for measuring the frequency spectrum of i... | 11/04/2008 |
| 7424404 | Method for determining the envelope curve of a modulated signal in time domain The disclosure relates to a method for determining the envelope curve of a modulated input signal with the following method steps: generating digital samples by digital sampling of the input signal, generating Four... | 09/09/2008 |
| 7421212 | Detecting and locating pulses using a Bragg cell Detecting a pulse of a signal includes receiving the signal and a light beam. The signal drives a spatial light modulator to modulate the light beam, where the complex amplitude of the modulated light beam is proportional to the signal current. The modulated light b... | 09/02/2008 |
| 7400129 | Measurement of distortion in an amplifier Parametric measurement of first- and second-generation telecommunications equipment has been relatively straightforward. The evolution to more complex transmission schemes such as those proposed for third-generation (3G) telecommunications devices can employ the sub... | 07/15/2008 |
| 7378832 | Probing high-frequency signals Apparatus and associated systems and methods may relate to a wide bandwidth cable assembly that may include an active amplification stage to receive high frequency signals (e.g., 1 GHz or above) through a transmission line extending distally to a passive, high densi... | 05/27/2008 |
| 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 |
| 7317309 | Wideband signal analyzing apparatus, wideband period jitter analyzing apparatus, and wideband skew analyzing apparatus A wideband signal analyzing apparatus for analyzing an input signal includes frequency-shifting means for generating a plurality of intermediate frequency signals by shifting a frequency of the input signal as much as respectively different frequency-shifting amount... | 01/08/2008 |
| 7315172 | Method for measuring spectral noise densities beyond instrument capability with deterministic confidence levels A mechanism for measuring noise densities below the noise floor of a measuring instrument. The measuring instrument may first acquire a fully-averaged reference spectral noise density trace and estimate corresponding reference statistical parameters. Based on the re... | 01/01/2008 |
| 7313492 | Method and device for increasing the dynamic range and measuring accuracy of a measuring device for spectrum and/or network analysis A method and a device for increasing the dynamic range and measuring accuracy of a measuring device for spectrum and/or network analysis images a high-frequency electronic signal within a frequency range into at least two spectra through a first frequency translatio... | 12/25/2007 |
| 7310504 | IF frequency response characterization employing overlapping frequency bands A method and system characterizes an IF response of a receiver under test, such that an effect on the characterization by errors associated with uncertainties in knowledge of an RF stimulus signal used to perform the characterization is reduced. The method includes ... | 12/18/2007 |
| 7304468 | Method and apparatus for detecting minute oscillation and WiBro repeater having the same Disclosed are a method and apparatus for detecting minute oscillation in a WiBro repeater, and the WiBro repeater having the same. The method of detecting minute oscillation in a WiBro repeater includes: calculating an autocorrelation value of an input signal inputt... | 12/04/2007 |
| 7295715 | Apparatus and method for detecting frequency Provided are an apparatus and method for precisely processing an input signal by detecting the frequency characteristic of the signal and applying the detection result in an image signal processing block to reduce noise in the signal or enhance the details of the si... | 11/13/2007 |
| 7292047 | High-frequency power source A high-frequency power source supplies high-frequency power to a load whose reflection characteristic for the power varies with time. The power source includes a frequency-variable power generator, a power detector for detecting the power into the load and the power... | 11/06/2007 |
| 7276892 | Resonator based spectrum analyzer and method A spectrum analyzer includes an array of frequency-selective bulk acoustic wave (BAW) resonators each tuned to a predetermined different resonant frequency. The spectrum analyzer further includes a broadband BAW resonator that generates acoustic energy when connecte... | 10/02/2007 |
| 7271576 | Hand held antenna/network impedance analyzer A handheld portable battery powered digital antenna and/or network analyzer which derives complex impedance values at a given frequency includes an internal direct digital synthesis generator and provides software-defined multiple operating modes and real time graph... | 09/18/2007 |
| 7271575 | Oscilloscope based return loss analyzer A system, apparatus and method for performing differential return loss measurements and other measurements as a function of frequency uses a digital storage oscilloscope (DSO) having spectral analysis functions. A waveform generator generates a differential test sig... | 09/18/2007 |
| 7272527 | Method of test of clock generation circuit in electronic device, and electronic device In an electronic device having an interface circuit which operates using a fast clock source, frequency deviation of the clock source is inspected in the mounted state. The clock pulses of the fast clock source are counted in synchronization with an electronic devic... | 09/18/2007 |
| 7256584 | Method and system for measuring partial discharge In the measurement of partial discharge, a voltage detected by an antenna is input to a spectrum analyzer and a phase difference between an operating voltage and a power supply of the spectrum analyzer is obtained by phase domain analysis using the spectrum analyzer... | 08/14/2007 |
| 7254242 | Acoustic signal processing apparatus and method, and audio device A first band analyzer divides an acoustic signal received from a sound playback system through an input unit into frequency bands, and generates a first band level. An acoustic signal estimator estimates the band level of the original acoustic signal at the input un... | 08/07/2007 |
| 7254500 | Monitoring and representing complex signals A method of displaying signals containing a spatial and a temporal aspect, where multiple signals are received by multiple sensors. The received signals are decomposed into separate signal components within one or more distinct frequency bands. Signal components are... | 08/07/2007 |
| 7231311 | Method for characterizing high-frequency mixers Novel excitation signals are specifically designed for testing a high-frequency mixer such that all of the desired intermodulation products are measurable after being converted by a sampling frequency converter. This is achieved by using excitation frequencies which... | 06/12/2007 |
| 7218090 | Passive radio frequency power spectrum analyzer A spectrum analyzer includes a resonator board that in turn has a substrate and a plurality of resonators. Each resonator may include a first segment that includes a first segment discontinuity and that may also define a boundary and a second segment that has a seco... | 05/15/2007 |
| 7218091 | Integrated CMOS spectrum analyzer for on-chip diagnostics using digital autocorrelation of coarsely quantized signals An integrated spectrum analyzer for performing on-chip power spectrum measurements, includes a digital autocorrelator that includes an analog input for inputting analog signal samples from a chip, an analog-to-digital converter for converting the analog signal sampl... | 05/15/2007 |
