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| Number | Title | Issue Date |
| 7369458 | Transducer identification A transducer identification system provides transducer characteristic information to an echosounder. The echosounder, in turn, utilizes the transducer characteristic information to alter its functionality or parameters to optimize its performance. The transducer cha... | 05/06/2008 |
| 7366057 | Converter control with LC filtering An arrangement for signal processing in ultrasonic transducers in flow meters has an ultrasonic transducer acted upon by a drive signal with the ultrasonic transducer being connected to a resonant circuit matched to the frequency of the drive signal. The resonant ci... | 04/29/2008 |
| 7349291 | Pulse-echo ranging system A method and apparatus for controlling pulses in a pulse-echo level measurement or time-of-flight ranging system. The apparatus comprises a controller, a transducer, and an energy storage device. The energy storage device is operatively coupled to the transducer thr... | 03/25/2008 |
| 7004031 | Ultrasonic sensor An ultrasonic sensor includes a piezoelectric vibrator, a reverberation measuring device and a compensating device. The piezoelectric vibrator vibrates to transmit an ultrasonic wave, receives a reflected wave of the transmitted ultrasonic wave and produces an outpu... | 02/28/2006 |
| 6748803 | Liquid measurement system and shared interface apparatus for use therein A liquid measurement system including interface apparatus for sharing the excitation and signal processing of an ultrasonic transonic transducer and temperature measuring device remotely located at a liquid container is disclosed. The interface apparatus includes a ... | 06/15/2004 |
| 6731569 | Methods for reducing ringing of ultrasonic transducers Methods for reducing ringing of dual-function ultrasonic air-coupled transducers in which at least one electrical passive circuit is applied to the transducer. The circuit may be either a linear circuit or a non-linear circuit. Different circuits can be applied to t... | 05/04/2004 |
| 6674690 | Acoustic transducer damping method An acoustic device that places existing components in a damping pattern after transmitting an acoustic signal. In one embodiment, the device comprises a transistor bridge and an acoustic transducer. The transistor bridge is coupled between two predetermin... | 01/06/2004 |
| 6608798 | Transmit-receive switch apparatus and method A transmit-receive (T-R) switch for achieving fast T-R switching times while ensuring that the signal strength of a received signal is not fully coupled. A differential amplifier and an inverting amplifier, both having a coupling resistor as an input is u... | 08/19/2003 |
| 6570818 | Electroacoustic transducer The present invention relates to an electroacoustic transducer where the voltage of a capacitive acoustic element is controlled by charging and discharging the charge of the element via an inductance (L) by fast switches (K1, K2). In... | 05/27/2003 |
| 6418080 | Underwater detection apparatus An underwater detection apparatus comprises a transducer, a transmitter capable of generating transmitting signals of a plurality of respective frequencies and for generating a transmitting signal, a broadband trap circuit for transferring the transmittin... | 07/09/2002 |
| 6269052 | Transmitting/receiving circuit and transmitting/receiving method for a transducer The circuit and the method serve to transmit a transmission signal to a transducer and to receive a reception signal from the transducer. The transmitter and the receiver are each alternatively coupled to the transducer and decoupled from one another. The... | 07/31/2001 |
| 5742645 | Method of digital demodulation of a composite signal A method for digitally demodulating a complex modulation signal and allowing different parameters to be transmitted thereby. The input signal is baseband filtered and a complex demodulation is performed on the first subcarrier at a frequency Fp to obtain ... | 04/21/1998 |
| 5731664 | Electrical switched load relocation apparatus A wireless transmitter associated with a switched electrical connection and a receiver therefor, adapted for connection in an electrical path between the source of power and a load, enables the load to be controlled by the switch originally used to contro... | 03/24/1998 |
| 5696489 | Wireless boundary monitor system and method A wireless boundary monitor system used to monitor the integrity of a boundary surrounding an area uses at least two housings having at least one transmitting means for emitting ultrasonic pressure waves to a medium. Each of the housings has a plurality o... | 12/09/1997 |
| 5694373 | Sonic wave synchronizer A general-purpose, adaptable, device for interfacing acoustic and ultrasonic transducers to circuits for high resolution distance and motion measurement, and two-way communication. A generator signal (52) synchronizes to a sensing transducer signal (21), ... | 12/02/1997 |
| 5515339 | Ultrasonic transmitting-receiving apparatus Intervals of timing pulses generated by a timing pulse generating means are changed by an interval changing means, interference signals from a second vibrator having the same intervals of the timing pulses being eliminated by changing the interval of the ... | 05/07/1996 |
| 5469174 | Pulse transmitter for terminating reflected waves A pulse transmitter for terminating reflected waves is disclosed which utilizes a series switched charged line pulse generator with a shunt element that is switched into the circuit immediately after the pulse is launched into an output line. The shunt el... | 11/21/1995 |
| 5347495 | Matching transformer for ultrasonic transducer A transformer used to connect an electro-acoustic transducer to a transmitter and a receiver in a pulse-echo ranging system has a first winding connected to the transducer, and second and third windings connected in parallel to the transmitter and the rec... | 09/13/1994 |
| 5339259 | High speed high resolution ultrasonic position and orientation tracker A continuous wave ultrasonic tracking system using an ultrasonic transmitter acoustically radiating a continuous wave ultrasonic transmitted signal and an ultrasonic receiver detecting the transmitted signal as a received signal. The system mixes the tran... | 08/16/1994 |
| 5335545 | Ultrasonic detector with frequency matching An ultrasonic detector of the type for determining the level of a liquid within a tank or the magnitude of the flow of liquid within a conduit. The detector includes a transducer that generates bursts of ultrasonic energy and receives echoes of the energy... | 08/09/1994 |
| 5307273 | Apparatus and method for recognizing carpets and stairs by cleaning robot Apparatus and method for determining the condition of the floor to be cleaned by a cleaning robot. The apparatus comprises an ultrasonic wave signal transmitting circuit for transmitting an ultrasonic wave signal to an ultrasonic wave signal transmitter u... | 04/26/1994 |
| 5277065 | Detector with ringdown frequency matching An ultrasonic detector of the type for determining the level of a liquid within a tank or the magnitude of the flow of liquid within a conduit. The detector includes a transducer that generates bursts of ultrasonic energy and receives echoes of the energy... | 01/11/1994 |
| 5267219 | Acoustic range-finding system In an acoustic pulse-echo ranging system, a high impedance piezoelectric transducer element is connected via a transformer to a transmitter, and also directly to a high impedance input of a receiver through a network, in parallel with the transducer eleme... | 11/30/1993 |
| 5199299 | Ultrasonic unipolar pulse/echo instrument An ultrasonic unipolar pulse/echo instrument uses active switches and a timing and drive circuitry to control electrical energy to a transducer, the discharging of the transducer, and the opening of an electrical pathway to the receiving circuitry for the... | 04/06/1993 |
| 5177711 | Object detecting switch device This switch device for detecting an object comprises a transducer for emitting and receiving ultrasonic signals to and from an object, a transmitter for driving the transducer, a receiver for receiving a signal from the transducer, a gate for detecting a ... | 01/05/1993 |
| 5144592 | Ultrasonic transmission-reception system An ultrasonic transmission-reception system having a piezoelectric transducer for at least transmitting ultrasonic waves, a current generator for exciting the transducer so that it transmits an ultrasonic wave and electronic processing means able to deter... | 09/01/1992 |
| 5138586 | Acoustic logic circuits An acoustic sensor functioning as a digital logic device comprises a resonant chamber, at least one port establishing a first resonant frequency therein when the port is closed and establishing a second resonant frequency therein when the port is open, a ... | 08/11/1992 |
| 5136548 | Remote-control system for closures A remote-control system for closures with a movable hand transmitter with at least one transmission key, this transmitter generating and radiating directed coded control signals upon actuation of the transmission key of the hand transmitter. At least one ... | 08/04/1992 |
| 5073878 | Circuit for driving an acoustic transducer A driver circuit for an acoustic transducer includes a voltage regulator that provides a regulated DC output level for a high value load impedance and when the load impedance falls to a low value, its DC output exhibits a substantially reduced level. A tr... | 12/17/1991 |
| 5058083 | Flexducer preamplifier power controller Linear and switching amplifiers associated with acoustic transducers requ a gradual turn-on rather than an abrupt full-power level signal. A transducer preamplifier power controller circuit prevents the operation of fuses and the tripping of circuit brea... | 10/15/1991 |
| 5050986 | Synchronization system for controlling switches An optical ranging system includes optics that create a backscatter signal in response to a transmitted light pulse. The transmitted pulse is reflected from a target to provide range information. The backscatter signal is applied to trigger a threshold de... | 09/24/1991 |
| 5008862 | Object detecting switch device A switch device is disclosed for detecting an object which comprises a transducer for emitting and receiving ultrasonic signals to and from an object, a transmitter for driving the transducer, a receiver for receiving a signal from the transducer, a gate ... | 04/16/1991 |
| 5001678 | System for detecting surrounding environmental conditions using a multiple number of incoming signals A detection system forms a plurality of reception beams successively in angular directions by receiving incoming signals from various directions in a manner that the Doppler effect is produced to vary the carrier frequency of the incoming signals. The det... | 03/19/1991 |
| 4958327 | Ultrasonic imaging apparatus An ultrasonic imaging apparatus includes an ultrasonic transducer for outputting an ultrasonic beam and converting the echo of the ultrasonic beam into an echo signal, a transmitter section for supplying a drive signal to the ultrasonic transducer, a rece... | 09/18/1990 |
| 4951269 | Echo canceller with short processing delay and decreased multiplication number An echo canceller in a system, having a long impulse response such as in an acoustic system, which employs a fast Fourier transform to transform input data represented in the time domain into signals represented in the frequency domain to reduce calculati... | 08/21/1990 |
| 4942560 | Sonar projector array drive signal source A three-phase generator is used to directly drive an array of electroacoustic transducers without the usual high power amplifiers. Complex signals having general spectra are generated by driving the generator rotor field with an excitation comprised of in... | 07/17/1990 |
| 4926380 | Ultrasonic imaging apparatus An ultrasonic imaging apparatus comprises an ultrasonic probe, a transmitter/receiver circuit for driving the ultrasonic probe to emit an ultrasonic beam and processing an echo signal output from the ultrasonic probe and junction unit coupled between the ... | 05/15/1990 |
| 4918672 | Ultrasonic distance sensor An ultrasonic distance sensor transmitting from and receiving an ultrasonic wave with a single ultrasonic transmitting and receiving element to measure proximate distances such as vehicle floor heights or distances to obstacles or pedestrians approaching ... | 04/17/1990 |
| 4914951 | Apparatus for remote distance measurement An apparatus for remote distance measurement varies the decay time of an electronic transducer to measure the distance to objects that are close to the transducer. The decay time for the amplitude of the oscillations of the transducer is varied by changin... | 04/10/1990 |
| 4852407 | Method and apparatus for determining length of pipe utilizing sound waves A method and an apparatus for determining a length of a pipe utilizing sound waves, which comprise: transmitting sound waves having a prescribed frequency and a prescribed transmission intensity toward the interior of a pipe at one end thereof by an oscil... | 08/01/1989 |
