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"That’s an amazing invention, but who would ever want to use one of them?"
President Rutherford B. Hayes ; Said in 1876, after Alexander Graham Bell demonstrated the telephone to him at the White House
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| Number | Title | Issue Date |
| 7902835 | Transmission line driving circuit A transmission line driving circuit that can support a high-rate signal transmission and further can perform appropriate loss compensation in accordance with a signal pattern. A transmission line driving circuit 1 comprises a plurality of driver input circuit... | 03/08/2011 |
| 7436188 | System and method for improving time domain processed sensor signals Noise discrimination in signals from a plurality of sensors is conducted by enhancing the phase difference in the signals such that off-axis pick-up is suppressed while on-axis pick-up is enhanced. Alternatively, attenuation/expansion are applied to the signals in a... | 10/14/2008 |
| 7345490 | Filter calibration A method for calibrating a filter begins with the filter filtering a first signal having a first frequency to produce a first filtered signal, wherein the first frequency is in a known pass region of the filter. The processing continues by measuring signal strength ... | 03/18/2008 |
| 7342400 | Method and apparatus for measuring employing main and remote units A test instrument employs main and remote test units at respective ends of a cable under test. The units operate in an active or passive measurement mode, wherein one of the units begins as the active unit, applying test signals to the cable under test to make a set... | 03/11/2008 |
| 7319399 | System and method for monitoring the wearing compliance of hearing protection devices A system for monitoring the use of a hearing protection unit comprising a left ear hearing protection device (14) and a right ear hearing protection device (12) to be worn by a user (10) within a monitoring area, an arrangement (16, 18, 22, 1... | 01/15/2008 |
| 7295018 | Correction of loss and dispersion in cable fault measurements A method of correcting distortions resulting from loss and dispersion in cable fault measurements. A cable is measured in the frequency domain to obtain a reflected response. Fractional sinusoidal components of the reflected response having attenuated amplitude and ... | 11/13/2007 |
| 7235979 | Apparatus and method for measuring loop insertion loss single-endedly The system and method of determining insertion loss of a telephone line under test (LUT) determines a first insertion loss as a function of plurality of different equivalent circuit values of the LUT determined at a plurality of different frequencies of a first set ... | 06/26/2007 |
| 7199720 | Hearing protection warning device An apparatus for hearing protection comprising: a body having coupling means, said coupling means configured to attach to a body part; a sound sensor disposed in said body, said sound sensor configured to sense ambient sound; a sound processor coupled to said sound ... | 04/03/2007 |
| 7130429 | Method and an apparatus for processing auscultation signals An apparatus for processing auscultation signals, e.g. embedded in an electronic stethoscope with a digital readout of an estimated heart rate. The apparatus comprises a bias processor for receiving an auscultation signal and providing a biased auscultation signal; ... | 10/31/2006 |
| 7116728 | Quadrature alignment in communications receivers using dual delay lines The present invention, generally speaking, takes advantage of the properties of quadrature signals to achieve precise quadrature alignment in a simple fashion. In particular, the expectation of the product of quadrature signals is zero. In accordance with the teachi... | 10/03/2006 |
| 7088789 | Apparatus for providing a multi-mode interface between a baseband receiver and radio frequency circuitry An apparatus for providing a multi-mode interface between a baseband receiver and radio frequency (RF) circuitry. According to a preferred embodiment of the invention, the apparatus includes a first differential-to-single-ended converter, a second differential-to-si... | 08/08/2006 |
| 7038605 | Apparatus and method for measuring noise, and recording medium A noise measuring unit 24 measures a noise power based on an output from a digitizer 16 and the amplification factor of a limiter amplifier 12 when an output from a device under test 10 is supplied for the digitizer 16 through the ... | 05/02/2006 |
| 7035324 | Phase-noise measurement with compensation for phase noise contributed by spectrum analyzer A method and apparatus compensates for phase noise added by a spectrum analyzer from phase noise measurements of a signal under test (SUT) taken by the spectrum analyzer. The method comprises the steps of measuring the phase noise of the SUT, determining the added p... | 04/25/2006 |
| 7006939 | Method and apparatus for low cost signature testing for analog and RF circuits A low cost signature test for RF and analog circuits. A model is provided to predict one or more performance parameters characterizing a first electronic circuit produced by a manufacturing process subject to process variation from the output of one or more second e... | 02/28/2006 |
| 7002357 | Method and apparatus for phase calculation from attenuation values using a Hilbert transform for FDR measurements The invention concerns a method and a device for phase calculation from attenuation values using a Hilbert transform for reflectometric measurements in the frequency domain. The invention is characterized in that the measuring system comprises a signal source for a ... | 02/21/2006 |
| 6965242 | Procedure and apparatus for the determination of the noise level of an electronic object to be measured An apparatus for the determination of the magnitude of a noise (TDUT) of an electronic object to be measured (2) includes a sine signal source (1), which generates a sine signal (Sin) for input into said object to be measured (... | 11/15/2005 |
| 6959037 | System and method for locating and determining discontinuities and estimating loop loss in a communications medium using frequency domain correlation A system for determining characteristics associated with a communication channel includes a transmitter for transmitting a first signal via the communication channel. The system includes a receiver for receiving a second signal via the communication channel in respo... | 10/25/2005 |
| 6954076 | Aircraft multi-function wire and insulation tester An aircraft multi-function wire and low voltage insulation tester, having a time domain reflectometer, a digital multi-meter, and a matrix switch integrated in a computer, and a connector having a plurality of output pins allowing a plurality of wires to be hooked u... | 10/11/2005 |
| 6914437 | Filter calibration and applications thereof A method for calibrating a filter begins with the filter filtering a first signal having a first frequency to produce a first filtered signal, wherein the first frequency is in a known pass region of the filter. The processing continues by measuring signal strength ... | 07/05/2005 |
| 6864689 | Determining cable attenuation and loss of signal threshold Attenuation of a pulsed signal traversing a cable is assessed by identifying a pulse in a signal received after traversing the cable and determining first and second reference signal levels in dependence upon characteristics of the pulse. A measurement is made of th... | 03/08/2005 |
| 6844740 | Measuring a signal using a programmable gain amplifier Measuring a signal includes setting a gain numerator of a gain value and setting a gain denominator of the gain value, where the gain value is a ratio of the gain numerator to the gain denominator. An input signal is received and adjusted in accordance to the gain v... | 01/18/2005 |
| 6819119 | Method for evaluating a crystalline semiconductor substrate In a method for evaluating a crystalline semiconductor substrate which includes a collector layer, a base layer, and an emitter layer and is used for a heterojunction bipolar transistor, a layer is provided having the same composition as the base layer. The semicond... | 11/16/2004 |
| 6744261 | Method and an apparatus for measuring the ratio of the amplification factor of a signal level normalizer An apparatus and method of determining the ratio of an amplification factor before and after changing the amplification factor of a signal normalizer that amplifies the voltage amplitude of signals input from a signal generator so that it stays within a predetermine... | 06/01/2004 |
| 6745137 | Single ended attenuation measurement A signal-based cable attenuation measurement device, system and methodology provides measurement of attenuation characteristics of a cable over a wide frequency spectrum. Located at a single location on a cable, a measurement device injects a signal on to the cable ... | 06/01/2004 |
| 6731681 | Method for determining the frequency instability noise from a source and a device for implementing the method A method and device for measuring frequency instability noise ΔTRMS from a source includes measuring the signal to noise ratio SRN1 at the output from a circuit having an input to receive a frequency input signal ft, an output to supply an output ... | 05/04/2004 |
| 6687289 | Method for measuring the attenuation in digital transmission lines A method for measuring the attenuation in digital transmission lines between a switching center and a subscriber station, with a first pulse of a known frequency spectrum being sent from the switching center to the transmission line. From the multitude of... | 02/03/2004 |
| 6661217 | Wideband precision current sensor A wideband precision current sensor employs DC-coupled and AC-coupled sensing circuits to generate lower and higher frequency sense signals; which are combined to form a wideband output signal that is proportional to a wideband current of interest. The fr... | 12/09/2003 |
| 6606583 | Real-time error-suppression method and apparatus therefor A thorough error suppression signal measurement system (20) having a transmitter (300) for propagating a transmission signal to a first probe 100, through a device under test (26), and into a second probe (200), and for propagating reference signals to th... | 08/12/2003 |
| 6496017 | Measuring antenna signal strength with automatic gain control receiver Apparatus and method for measuring an antenna signal strength (X). The apparatus includes a first amplifier section (3) for receiving an antenna signal and having a first automatic gain control stage; a second amplifier section (8) having a second automat... | 12/17/2002 |
| 6144265 | Calibrated high power radio frequency step attenuator A high power radio frequency(RF) precision step attenuator includes a trim attenuator, a multi-step attenuator and a calibration/control circuit. The control circuit includes a memory for storing attenuator specific calibration data. The calibration data ... | 11/07/2000 |
| 6114858 | System for measuring noise figure of a radio frequency device Noise factor of a radio-frequency device under test (DUT) is determined by driving the input of the DUT with a randomly modulated sine wave and measuring the power of a resulting DUT OUTPUT signal within each of a set of equally-sized frequency bands. The... | 09/05/2000 |
| 6104197 | Apparatus for acquiring waveform data from a metallic transmission cable An apparatus for acquiring waveform data from a metallic transmission cable under test includes a transmitter for generating interrogating pulses for examining a segment or segment lengths of the transmission cable under test. A variable gain receiver rec... | 08/15/2000 |
| 6002232 | Robust vibration suppression methods and systems Robust Vibration Suppression methods and systems providing improved robustness range and are effective in single or multiple degree of freedom systems are disclosed. Methods disclosed include providing an output response from a physical system by selectin... | 12/14/1999 |
| 5783977 | Tunable and bandwidth programmable multi-element filter system A method and apparatus which realize an RF bandpass filter having a tunable bandwidth and center frequency over a large range of the radio frequency spectrum. The filter is comprised of a cascade of filter elements. Each element is comprised of a signal s... | 07/21/1998 |
| 5698985 | Cross-talk measurement instrument with source indication as a function of distance A pulse-based LAN cable test instrument that processes time-domain cross-talk measurement information in order to troubleshoot and quickly locate sources of cross-talk as a function of distance along the LAN cable system is provided. A pulse-response time... | 12/16/1997 |
| 5594350 | Signal detecting circuit for digital controller An instantaneous value of alternating current signal from an instrument potential transformer 10 or an instrument current transformer 9 is processed with an analog filter 21, 22, the frequency to be used for correction being detected with a frequency dete... | 01/14/1997 |
| 5548222 | Method and apparatus for measuring attenuation and crosstalk in data and communication channels A termination control circuit is coupled to a far end of a cable. A modulated test signal is reflected back to a near end of the cable at a different frequency but at substantially the same level of attenuation as the test signal. Signal attenuation in th... | 08/20/1996 |
| 5530367 | Pulse based cable attenuation measurement system A pulse-based cable attenuation measurement system provides a measurement of attenuation characteristics of a cable over a wide frequency spectrum. A main test and troubleshooting unit of a cable test instrument applies stimulus signals via a selected one... | 06/25/1996 |
| 5432455 | Method and apparatus for detecting arcing in alternating current power systems by monitoring high-frequency noise An arc detector or detecting potentially hazardous arcing in electrical connections comprises detection and signal processing circuitry for monitoring high-frequency noise on the power line characteristic of arcing and distinguishable from other sources o... | 07/11/1995 |
| 5404109 | Method and apparatus for testing circuits containing active devices A test system for measuring the characteristics of an active circuit employs a pulsed bias technique for periodically biasing the input control port of the active circuit into the active region of operation. Biasing is achieved with a bias voltage that is... | 04/04/1995 |
