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| Number | Title | Issue Date |
| 7346464 | Gait waveform feature extracting method and individual identification system A gait waveform feature extracting method and an individual identification system extract features of the gait waveform. A one-step waveform corresponding to one step of a walking movement is specified using, as an index, a peak amplitude corresponding to a state wh... | 03/18/2008 |
| 7231146 | Optical communication system Communicating a signal includes receiving the signal at a primary device of a switching system, where the primary device is associated with a primary path along which the signal is propagating. A primary overmodulation signal associated with the primary path is gene... | 06/12/2007 |
| 7190897 | Optical channel operating parameters monitoring In a communication system, channel operating parameter carrier frequencies are located in the vicinity of data nulls in a data spectrum. The operating parameter carriers are summed with the data signal. At the receiver, the operating parameter carrier frequencies ar... | 03/13/2007 |
| 7151895 | Method and system for automatically setting gain for an amplifier in an optical network A method for automatically setting a gain for an amplifier in an optical network includes transmitting, from a source proximate an upstream amplifier coupled to an optical span, a stable signal over the optical span. The method also includes using the stable signal ... | 12/19/2006 |
| 7139567 | Tone based command system for reception of very weak signals This disclosure presents a communication receiver system for spacecraft that includes an open loop receiver adapted to receive a communication signal. An ultrastable oscillator (USO) and a tone detector are connected to the open loop receiver. The open loop receiver... | 11/21/2006 |
| 7139613 | Implantable medical device communication system with pulsed power biasing An implantable medical device communication system communicates information between an implantable medical device and at least one slave device by way of a two-wire bus. Slave devices may include remote sensors, actuators and other implantable medical devices. The i... | 11/21/2006 |
| 7123129 | Modulation of the resonant frequency of a circuit using an energy field A transponder has a resonant RLC circuit with one or more electromagnetic energy storage components that vary in response to an externally applied modulating energy field. In addition to the externally modulating energy field, a base station transmits a carrier sign... | 10/17/2006 |
| 7116244 | Method and system for producing a magnetic field signal usable for locating an underground object Transmitted magnetic field signals useable for locating an underground object, and methods and systems for generating the same. The magnetic field signal has desired spectral characteristics. More specifically, the transmitted magnetic field signal includes a carrie... | 10/03/2006 |
| 7027357 | Acoustic communication device and acoustic signal communication method The present invention provides an acoustic transmitter for sequentially transmitting a plurality of pulse signals by sound. Each of the plurality of pulse signals is a signal of at least one modulated carrier wave, which has a predetermined frequency. The carrier wa... | 04/11/2006 |
| 7013178 | Implantable medical device communication system An implantable medical device communication system communicates information between an implantable medical device and at least one slave device by way of a two-wire bus. Slave devices may include remote sensors and other implantable medical devices. The implantable ... | 03/14/2006 |
| 6850623 | Parametric loudspeaker with improved phase characteristics A parametric loudspeaker which uses multiple piezoelectric bimorph transducers. These multiple piezoelectric bimorphs have a resonant frequency which varies from unit to unit. The phase response at and near the resonant frequency changes at a very high rate with sli... | 02/01/2005 |
| 6693392 | Method and apparatus for generating a flash or a series of flashes from a multiparameter light A multiparameter light is a type of theater light that includes an arc lamp and a shutter in combination with one or more optical components for creating various lighting effects, suitable electrical and mechanical actuating components, and suitable power... | 02/17/2004 |
| 6600270 | Method and apparatus for generating a flash or series of flashes from a multiparameter light A multiparameter light is a type of theater light that includes an arc lamp and a shutter in combination with one or more optical components for creating various lighting effects, suitable electrical and mechanical actuating components, and suitable power... | 07/29/2003 |
| 6433673 | Digital enunciator, process and communication system employing same A receiver in a communication system is coupled to a transmission channel for receiving communication signals transmitted over a transmission channel. The receiver includes signal receiving electronics for receiving communication signals directed to the r... | 08/13/2002 |
| 6043749 | Frequency detection circuit A frequency detection circuit has a transistor switching device between first and second electric potentials, and a gate applied with a clock signal. A resistor and a capacitor are connected in parallel between the output of the transistor switching devic... | 03/28/2000 |
| 5880681 | Apparatus for determining the position of a work implement An apparatus for determining the position of a work implement relative to an earthworking machine. An antenna is mounted to the machine and is oriented to transmit a high frequency signal toward the implement and receive a reflected signal back from the i... | 03/09/1999 |
| 5856790 | Remote control for a plug-dropping head An apparatus and method of dropping a pumpdown plug or ball is revealed. The assembly can be integrally formed with a plug-dropping head or can be an auxiliary feature that is mounted to a plug-dropping head. The release mechanism is actuated by remote co... | 01/05/1999 |
| 5774501 | High speed multilevel symbol telemetry system for cardiac pacemakers A high speed telemetry system for implantable devices such as a pacemaker includes a transmitter disposed in an implantable housing and an external receiver. Typically the housing is metallic and it attenuates drastically electromagnetic signals having fr... | 06/30/1998 |
| 5764161 | Sensing apparatus using frequency changes An apparatus and method for determining various physical quantities such as temperature, pressure, stress, strain, distance and the like in a manner such that a change in the physical quantity of interest results in a measurable change in the frequency of... | 06/09/1998 |
| 5682149 | Measuring device for the wire-free measurement of temperature The invention relates to a measuring device for the wire-free measurement of temperatures, in particular for the measurement of the body temperature of animals. A transponder is injected as a probe in each animal with the aid of a hollow needle, which is ... | 10/28/1997 |
| 5642105 | Bearing with an arrangement for obtaining an indication of the temperature within the bearing A temperature sensor is mounted on the inside surface of a stationary race around which a rotatable race rotates. Electric signals from the temperature sensor are converted into acoustic signals. Without the use of any hard wires, the acoustic signals are... | 06/24/1997 |
| 5635919 | Sensing apparatus An apparatus for determining various physical quantities such as temperature, pressure, stress, strain, distance and the like in a manner such that a change in the physical quantity of interest results in a measurable change in the frequency of oscillatio... | 06/03/1997 |
| 5519389 | Signal synchronized digital frequency discriminator A digital frequency discriminator processes input pulses including first and second time separated input pulses to determine if the frequency of any two sequential pulses lie within a predetermined frequency band with upper and lower frequency limits and ... | 05/21/1996 |
| 5483233 | Analogue telemetry system and method for fault detection in optical transmission systems An analogue telemetry system/method provides fault location in an optical transmission system including optical fibre amplifiers. Each amplifier includes an optical fibre amplifier with an AGC loop therearound, a respective optical pump source being inclu... | 01/09/1996 |
| 5264843 | High speed reflected impedance telemetry system for implantable medical device A telemetry system which will transmit data at a relatively high rate while retaining a high degree of accuracy is disclosed which utilizes a servo feedback loop in conjunction with a conventional reflected impedance receiving front end parallel LC circui... | 11/23/1993 |
| 5008665 | Measuring device having transmitter A measuring device having a transmitter includes a measuring device section, a data processing unit, a transmitter, and a casing. The measuring device section converts measuring data into a digital value and outputs it. The data processing unit arranges t... | 04/16/1991 |
| 4924482 | Data-transmitting apparatus The analog data representing a value measured of a product by means of a measuring device such as a vernier calipers is converted into digital data by an analog-to-digital converter. A CPU incorporates the digital data into a data message. The CPU is driv... | 05/08/1990 |
| 4872007 | Transducer for measuring pressure in gas-filled cables A pressure transducer includes a multiplexer unit for the selection of pressure sensors by decoding a sensor address, thereby permitting a single power supply, a single counter and a single clock generator to be used, in order to enable and transmit the m... | 10/03/1989 |
| 4760351 | Multiple oscillator device having plural quartz resonators in a common quartz substrate A system is described which comprises many quartz resonators, all formed on the same quartz substrate. The method of fabrication ensures that all the resonators are mechanically and electrically isolated from each other. The oscillation frequencies of the... | 07/26/1988 |
| 4730183 | Multiple-mode data acquisition system A local data unit (10) provides sequenced acquisition and transmission of data signals received in different signal formats from local and remotely deployed sensors (24, 28). The network uses a microprocessor based stage (42) to sequentially control acqui... | 03/08/1988 |
| 4725839 | Remote, inductively coupled, transducer interface An exciter and detector circuit (A1, A2) is inductively coupled (18, 20) with a current conductor (B). The current conductor extends to a remote location at which it is inductively coupled (26, 30) with a remote transducer and encoder circuit (C1, C2). Th... | 02/16/1988 |
| 4680586 | Generator capable of producing multiple signals with different frequencies and a transmitter which includes a signal generator of this kind In accordance with the present invention, a signal generator providing multiple signals with different frequencies includes, in a combined form, a clock (1), an address counter (2), a memory (3), and a digital-to-analog converter (4), which are to be seri... | 07/14/1987 |
| 4654528 | Radiation level reporting system A remote sensing transponder system is disclosed including apparatus for sensing gamma radiation levels proximate thereto, generating a signal indicative of the sensed radiation level, and transmitting an RF Signal modulated with the generated signal to a... | 03/31/1987 |
| 4642618 | Tool failure detector A failure detector detects breakage in a machine tool cutting element, such as a drill bit, by use of a accelerometer supported against a workpiece being operated on by the cutting element. Vibrations are induced in the workpiece by the cutting operation,... | 02/10/1987 |
| 4630033 | Method and apparatus for measuring phase An angle transducer includes input rotor and reference rotor assemblies that are mounted for rotation upon a common shaft and that cooperate with respective moveable input stator and fixed reference stator assemblies to produce signals whose phase differe... | 12/16/1986 |
| 4628315 | Addressable transducer with improved address signal processing An addressable transducer is disclosed for use in a monitoring system of the type including a central station and multiple addressable transducers for monitoring physical conditions. The transducer is connected across a single pair of transmission lines h... | 12/09/1986 |
| 4618776 | Light and weather resistance sensing system with a sensed signal transmission channel A light and weather resistance testing apparatus (9) is provided with a sensor (1) located in the plane of the testing samples (14). The sensor (1) uses a transmitter (4) for wireless transmission of signals representing radiation received to an antenna (... | 10/21/1986 |
| 4568933 | Electronic well tools and multi-channel recorder An electronic recording device and multiple sensors for measuring various parameters at locations remote from the recording device. The multiple sensors can be joined together to comprise a downhole tool for measuring various parameters within a well bore... | 02/04/1986 |
| 4520359 | Current frequency waveform transmitting on D.C. power lines A frequency transmission system comprises a pulse train generator and a signal converter. The pulse train generator generates a pulse signal of a sufficiently short duration in response to oscillation frequency signals, and the signal converter circuit co... | 05/28/1985 |
| 4518839 | High frequency heating apparatus with wireless temperature probe A novel high frequency heating apparatus for detecting the internal temperature of an object contained in a heating chamber and controlling the heating thereof is disclosed, in which the temperature change of the object is picked up as a change of the res... | 05/21/1985 |
