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| Number | Title | Issue Date |
| 7270325 | Sheet feeding apparatus, image reading apparatus, and method of detecting double feed A sheet feeding apparatus includes first and second transport devices disposed at a transport guide with a distance in between for nipping and transporting a sheet, and a double feed detection device disposed between the first transport device and the second transpo... | 09/18/2007 |
| 7172195 | Image reading apparatus A sheet feeding apparatus includes a stacker for stacking a sheet; a sheet separating device for sequentially separating and feeding the sheet stacked on the stacker; a sheet transport guide for guiding the sheet from the separating device to a processing position; ... | 02/06/2007 |
| 7151835 | Personal noise monitoring apparatus and method The present invention relates to a method, system and device for monitoring noise received by individuals operating in noisy environments. The device comprises a substantially credit card size housing and can be worn as a “badge”. The device includes a mo... | 12/19/2006 |
| 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 comprising an array of pressure sensing elements disposed thereon for ... | 09/26/2006 |
| 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 determined by means of a sound level signal which describes the sound,... | 10/11/2005 |
| 6924895 | Sensor for optically sensing air borne acoustic waves The present invention relates to an optical sensor of air borne acoustic waves. The sensor comprises means for producing mutually coherent optical sampling and reference beams, which may be combined to form an intermediate frequency carrier, the sampling beam being ... | 08/02/2005 |
| 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 this data is used to determine the ultrasonic activity in th... | 02/17/2004 |
| 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 surface and configured to both transmit an ultrasonic sign... | 02/03/2004 |
| 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 response of the appliance to provide output approximating noise... | 01/14/2003 |
| 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 transducer, a receiving piezoelectric transducer, and a phase-sh... | 08/27/2002 |
| 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 of frequencies in substantially equidistant steps of a fir... | 11/20/2001 |
| 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 thereto, wherein said ultrasonic processor comprises a holl... | 06/27/2000 |
| 6012334 | Vibration wave detecting method and vibration wave detector A vibration wave detector, having a receiver for receiving vibration waves such as sound waves and so on to be propagated in a medium, a resonant unit having a plurality of cantilever resonators each having such a length as to resonate at an individual pr... | 01/11/2000 |
| 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 different modes of operation. A profile generator is coupled ... | 11/03/1998 |
| 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 uniformly cylindrically shaped or conically shaped. A drive... | 06/23/1998 |
| 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 or vibration in a structure. The invention relates partic... | 04/15/1997 |
| 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 envelope of each of those narrow band components, determines ... | 07/11/1995 |
| 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 locating areas suspected of being damaged by hot hydrogen. Th... | 04/11/1995 |
| 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 system divides at least part of the wide-band sound signal i... | 11/09/1993 |
| 5119432 | Frequency division, energy comparison signal processing system A frequency division, energy comparison processing system which decomposes a wide-band signal into a plurality of narrow frequency band components, generates the energy envelope of each of those narrow band components, and compares a function of each ener... | 06/02/1992 |
| 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 is controlled by the system. It is controlled such that the... | 11/13/1990 |
| 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 generates an output voltage proportional to the instantane... | 04/07/1987 |
| 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 sub-bands. Zero crossing analysis is provided for each of the s... | 02/03/1987 |
| 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 into neural representations. Specifically, a high order t... | 08/20/1985 |
| 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 electromechanical transducer is located within the vessel at... | 08/23/1983 |
| 4399732 | Pitch identification device A transducer receives notes from a musical instrument and converts them into electrical signals. The signals are passed to filter banks containing filters having passbands in different octave ranges. The filtered signals in each bank are added and transla... | 08/23/1983 |
| 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 driving both the human ear and the artificial ear (acoustic co... | 03/14/1978 |
| 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 of the vibrating object is converted to an electric signal... | 08/16/1977 |
| 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 magnetic field, subjecting the bar to action from outside to make... | 03/22/1977 |
| 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, level detectors, light emitting diodes and a photosensitive ma... | 01/18/1977 |
| 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 human ear. The weighted sound signal is then utilized to gate ... | 08/31/1976 |
