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7971485 |
Method of and apparatus for testing wooden poles
A method of testing an elongate wooden element includes injecting an input acoustic signal into the element, detecting a return acoustic signal at a surface of the element, and determining a...
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7111517 |
Apparatus and method for in-situ measuring of vibrational energy in a process bath of a vibrational cleaning system
Apparatus and method are provided for in-situ measurement of vibrational energy applied to a wafer in a process bath of a vibrational cleaning system. The apparatus may be made up of a test wafer...
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6954146 |
Method for determining a state of a road during the driving mode of a motor vehicle
In a method for determining the state of a road during driving of a motor vehicle, the sound which is generated when a vehicle tire rolls on an underlying surface is sensed. A frequency signal is...
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6691578 |
Measurement systems for ultrasound in a vessel
The invention produces a change to the acoustic input power applied to a liquid in a vessel. The magnitude and shape of the resulting change in the ultrasonic field in the vessel is measured and...
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6684704 |
Measuring the surface properties of polishing pads using ultrasonic reflectance
The present invention provides a system and method for measuring the surface properties of polishing pads using noncontact ultrasonic reflectance. An ultrasonic probe is located over the polishing...
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6507650 |
Method for noise dosimetry in appliances employing earphones or headsets
A noise dosimeter for an appliance including a speaker to broadcast signals includes a filter receiving signals to be broadcast and having a transfer function generally modeling the frequency...
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6439034 |
Acoustic viscometer and method of determining kinematic viscosity and intrinsic viscosity by propagation of shear waves
An acoustic viscometer and method for determining both the kinematic viscosity and the intrinsic viscosity of a liquid which includes an acoustic wave generator, a transmitting piezoelectric...
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6318180 |
Method and apparatus for determining a frequency at which a resonator resonates
Determininig a frequency at which a resonator resonates comprising: driving an acoustic transmitter for applying an acoustic signal to the interior of a resonator by scanning through a first range...
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6079508 |
Ultrasonic processors
The present invention provides an ultrasonic processor for the treatment, for example, dispersing, emulsifying, dissolving, mixing or deagglomerating of materials by the application of ultrasound...
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5832412 |
Programmable digital frequency ultrasonic generator
A digital programmable ultrasonic generator for driving an ultrasonic transducer includes a computer for receiving and storing a plurality of selectable programs. The programs are indicative of...
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5768937 |
Acoustic sensor for in-line continuous monitoring of gasses
An acoustic cell includes multiple acoustic cavities fluidly coupled together. At least two of the acoustic cavities have unequal lengths and cross sections. End segments of the acoustic cell are...
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5621656 |
Adaptive resonator vibration control system
This invention relates to control systems for the control of noise and vibration. Resonators with adjustable properties are used in conjunction with an electronic control system to change the noise...
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5432862 |
Frequency division, energy comparison, source detection signal processing system
A frequency division, energy comparison, source detection signal processing system which decomposes a wide-band signal into a plurality of narrow frequency band components, generates the energy...
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5404754 |
Ultrasonic detection of high temperature hydrogen attack
This invention defines a combined inspection procedure using ultrasonic techniques for detection of hydrogen attack damage in material. The procedure comprises an initial scanning procedure for...
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5261007 |
Frequency division, energy comparison signal processing system
A frequency division, energy comparison signal processing system for detecting the presence of, and separating the contributions from, sources that compose a wide-band sound signal, in which the...
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4970656 |
Analog drive for ultrasonic probe with tunable phase angle
The system uses a tunable inductor in series with the piezoelectric crystal excitation transducer in the probe which has a flux modulation coil. The bias current through this flux modulation coil...
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4655086 |
Method and means for measuring sound intensity
Sound intensity is determined by simultaneously measuring instantaneous acoustic pressure and instantaneous particle velocity at a single point. A condenser microphone having a vibrating diaphragm...
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4640134 |
Apparatus and method for analyzing acoustical signals
A zero-crossing accoustical signal analyzer includes a plurality of parallel-connected adjacently tuned filter channels to separate an incoming accoustical signal into a plurality of adjacent...
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4536844 |
Method and apparatus for simulating aural response information
Speech and like signals are analyzed based on a model of the function of the human hearing system. The model of the inner ear is expressed as signal processing operations which map acoustic signals...
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4400805 |
Acoustically filtered transducer
Disclosed is an acoustic transducer which includes a pressure tight vessel with a window in the vessel which is transparent to acoustic wave energy. A gas is disposed within the vessel, while an...
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4079198 |
Electro-acoustic impedance bridges
An electro-acoustic impedance bridge for measuring the acoustic impedance of the human ear over a predetermined frequency range compares the magnitude and phase of the variable-frequency sound...
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4041783 |
System for measuring vibration frequency of vibrating object
A system for measuring the vibration frequency of a vibrating object useful for the adjustment of the vibration frequency of a piano string or like vibrating objects. In this system, the vibration...
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4012870 |
Apparatus for measuring and changing vibration frequency of metal B
A method of measuring and, where necessary, modifying the natural vibration frequency of a metal bar, more especially a ferromagnetic bar, comprising freely suspending the bar in a constant...
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4003264 |
Device for measuring and registering of sound
A device is shown for detecting and recording the presence of sound above specified predetermined levels during given time intervals. The circuit includes a microphone, a filter, an amplifier,...
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3977257 |
Audio dosimeter
An audio dosimeter for determining the exposure to noise as a function of both time and noise level. Input sound energy is appropriately weighted so as to account for the effect thereof on the...
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3884086 |
Audio dosimeter
An audio dosimeter for determining the exposure to noise as a function of both time and noise level. Input sound energy is appropriately weighted so as to account for the effect thereof on the...
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3875337 |
Method for monitoring a classroom
Audible sounds produced by student members of a classroom are monitored for instructional purposes by a method that includes arranging the student members of a class into a plurality of...
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3868857 |
AUDIO DOSIMETER
An audio dosimeter for individual use determining exposure to sound energy as a function of both frequency and pressure level, with integration over the time of exposure and incorporating storage...
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3800906 |
LASER HETERODYNE ACOUSTIC SENSOR
First and second pairs of reflective elements including a single laser cell, define adjacent, parallel, resonant optical paths of different lengths through the same laser medium. One of the...
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3778552 |
PERSONAL SOUND MONITOR
A personal sound monitor wherein the sound is detected by a microphone and converted to a related electrical signal. The level of the signal is used to gate one of the plurality of levels in a...
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3750034 |
SYSTEM FOR DETERMINING WHETHER A SIGNAL LIES WITHIN A SELECTED FREQUENCY BAND
Disclosed is a system for receiving and detecting propagated mechanical-wave analog signals in which the analog signals are converted to a digital signal wherein pulse spacing is proportional to...
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3747703 |
NOISE EXPOSURE COMPUTER AND METHOD
A portable, fully automatic instrument for at any given time determining precisely a person's cumulative noise exposure as a percentage of permissible noise exposure is disclosed. The instrument...
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3697973 |
SOUND HAZARD INTEGRATOR
A cumulative sound exposure instrument has an alarm indicator responsive to a selected maximum instantaneous loudness level and has a second indicator which is responsive to a selected value of...
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3696206 |
AUDIO DOSIMETER
An audio dosimeter for individual use determining exposure to sound energy as a function of both frequency and pressure level, with integration over the time of exposure and incorporating storage...
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3670841 |
METHOD OF ADJUSTING A SPEAKER OF AN ELECTRICAL SOUND PRODUCING INSTRUMENT
A method of adjusting a speaker of an electrical musical instrument to a room in which music is to be played on the instrument through a loudspeaker. A note is sounded through at least one speaker...
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3545564 |
SOUND LEVEL INDICATOR FOR THE PRECISE DETERMINATION OF SOUND LEVELS
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3396241 |
STETHOSCOPE WITH SOUND SPECTRUM SELECTION
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3294909 |
Electronic analog ear
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3236327 |
Sound level time integrator
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3220247 |
Vibration vector measurement and display apparatus
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3211832 |
Processing apparatus utilizing simulated neurons
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3154170 |
Method of and apparatus for calibrating vibratory signals
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3105381 |
Arrangement for measuring the damping of the oscillations of a mechanical system
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3089561 |
Industrial noise hazard meter
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3031528 |
Loudness meter
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3014550 |
Noise exposure meter
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2806082 |
Means for detecting and indicating the activities of bees and conditions in beehives
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