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| Number | Title | Issue Date |
| 5627746 | Low cost controller A simple, low cost active noise cancellation system employing a delay and actuator estimator (35), a gain determination (34), a gain (33) and speaker (36) that cancels stationary random noise such as that encountered on a rangehood fan.... | 05/06/1997 |
| 5617479 | Global quieting system for stationary induction apparatus The present invention relates generally to global noise or sound control and, more particularly, to the control or sound radiated from stationary induction apparatus such as power transformers and shunt reactors by use of active enclosures and active pane... | 04/01/1997 |
| 5590206 | Noise canceler In a noise canceler, a pilot-canceling signal without noise is applied to the inverting input of a subtracter via a first MOS transistor. When a noise signal is present, a pilot signal and noise signal passing through a capacitor are applied to the invert... | 12/31/1996 |
| 5577504 | Magnetic resonance apparatus In a magnetic resonance apparatus including an active noise reduction arrangement (9, 49, 51, 53) for use by a patient (5) undergoing examination in the apparatus the transducers (25, 31) of the arrangement are non-magnetic, e.g. are of the electret, piez... | 11/26/1996 |
| 5570426 | Method and apparatus for intracranial noise suppression A method and apparatus for active cancellation of vibrational noise produced by a medical instrument in the head of a patient. Vibrations from the instrument, as well as vibrations in the bone structure in the head of the patient, are sensed and processed... | 10/29/1996 |
| 5546467 | Active noise attenuated DSP Unit An active noise control system for controlling multiple home appliances and including a power distribution network by which many appliances can be quieted by remotely processing noise signal information and forwarding noise cancelling signals to the appli... | 08/13/1996 |
| 5530766 | Noise reducing apparatus of a cyclo-fan A noise reducing apparatus for a cyclo-fan is provided for the canceling of a whistling noise with a specific frequency, determined by the product of the rotation number of the cyclo-fan and the number of blades thereof. The apparatus comprises a cyclo-fa... | 06/25/1996 |
| 5502869 | High volume, high performance, ultra quiet vacuum cleaner An ultra quiet vacuum cleaner having a bag cavity (44), a motor/blower chamber (48) connected to said cavity by a flexible coupling (47) and an active, adaptive noise cancellation controller (52) so configured to quiet the exhaust of the air used to cool ... | 04/02/1996 |
| 5499423 | Noise control apparatus for vacuum cleaner A noise control apparatus for a vacuum cleaner, having a simple construction and capable of easy installation in the vacuum cleaner which effectively attenuates noise in a wide frequency band. The noise control apparatus includes a control unit, a noise d... | 03/19/1996 |
| 5499301 | Active noise cancelling apparatus An active noise cancelling apparatus for actively controlling noise generated by a compressor, where noise is apt to externally leak from an opening portion of a machine chamber storing the compressor driven by an A.C. power supply. The active noise cance... | 03/12/1996 |
| 5471537 | Kitchen ventilator A kitchen ventilator includes a housing (10) having a motor powered fan (20), an inlet (11), an inlet passage (25) between the inlet and the fan, an outlet (17), and an outlet passage (23) between the fan and the outlet, the passages are separated by a ge... | 11/28/1995 |
| 5457750 | Method and device for reducing noises generated at an indoor unit of a separate type room air conditioner package A method of and a device for reducing noises generated at an exhaust grid of an indoor unit of separate type room air conditioner package includes speakers disposed at upper and lower sides of the exhaust grid, a sensor for sensing a noise condition at a ... | 10/10/1995 |
| 5428965 | Motor control for refrigeration appliance A microprocessor speed control system for a refrigeration apparatus for controlling a speed of at least one variable speed motor is provided. The control system has an input for receiving demands to vary a speed of the motor and a memory where certain pre... | 07/04/1995 |
| 5414775 | Noise attenuation system for vibratory feeder bowl Active system for both attenuating mechanical vibration and the noise occasioned by the operation of vibratory feeder bowls in manufacturing having accelerometer (20) adjacent feeder bowl (21) and an inertial actuator (57) and a controller (59) to control... | 05/09/1995 |
| 5410607 | Method and apparatus for reducing noise radiated from a complex vibrating surface An apparatus for reducing noise radiated from a complex vibrating surface includes: a motion sensor responsive to a region of the vibrating surface that contributes to a noise field in a fluid medium; a controller having a substantially fixed transfer fun... | 04/25/1995 |
| 5347586 | Adaptive system for controlling noise generated by or emanating from a primary noise source An adaptive noise control system comprises a reference microphone (12) (FIG. 2) for generating a reference signal (x(t)) that is correlated with noise emanating from a primary noise source (10), secondary loud speaker sources (S1, S2... | 09/13/1994 |
| 5315661 | Active high transmission loss panel An active high transmission loss panel for quieting either one or two way sound radiation which incorporates a number of cells (11) which contain sensors and actuators (12) adapted to be controlled independently or interactively so as to attenuate noise a... | 05/24/1994 |
| 5289147 | Image forming apparatus having system for reducing noise An image forming apparatus includes a housing, a mechanism, mounted in the housing, for forming images on a medium, an operation panel formed on the housing, the mechanism being driven in accordance with an operating instruction input from the operation p... | 02/22/1994 |
| 5271062 | Device for noise attenuation of weaving machine A device for noise attenuation attenuates the noises generated from weaving machines and comprises first conversion means for receiving a sound and outputting an electrical acoustic signal corresponding to the sound, first signal processing means for rece... | 12/14/1993 |
| 5253486 | Silencer attenuating a noise from a noise source to be ventilated and a method for active control of its noise attenuation system A silencer attenuating a noise from a noise source to be ventilated of this invention comprises a machine compartment with a one-dimensional duct configuration whose sectional dimension is sufficiently small in comparison with the wavelength of the noise ... | 10/19/1993 |
| 5245385 | Image forming apparatus which reduces noise generated therefrom An image forming apparatus reduces the level of noise escaping therefrom via an opening. The noise is generated from a motor which drives an image forming part in the image forming apparatus, from a radiator fan which radiates heat inside the apparatus to... | 09/14/1993 |
| 5233540 | Method and apparatus for actively reducing repetitive vibrations A method and apparatus for reducing repetitive vibrations in a region or structure by applying a plurality of control vibrations via a plurality of actuators (13) located in the region or structure (11) and cyclically updating the control vibrations to im... | 08/03/1993 |
| 5135079 | Noise prevention apparatus for a cable winch elevator A cable winch elevator noise prevention apparatus is provided with a winch on the top most floor of a building and having a main sheave that winds a cable up and down, to both ends of which are fixed an elevator cage and a counterweight, and at least two ... | 08/04/1992 |
| 5129003 | Active noise control apparatus for domestic appliance An apparatus includes an electro-acoustic converter, a detector, a noise correlative signal generator, and an additional tone signal generator in order to actively control noise generated by an electromagnetic machine, which noise is apt to externally lea... | 07/07/1992 |
| 5127235 | Low noise refrigerator and noise control method thereof In a low noise refrigerator, a rotary compressor constituting a noise source is arranged within a machine chamber provided with an opening in one location, which chamber has a one-dimensional duct construction having a cross-sectional dimension which is s... | 07/07/1992 |
| 5125241 | Refrigerating apparatus having noise attenuation A refrigerator with a noise attenuating function includes a cabinet having storage and machine compartments, a compressor disposed in the machine compartment, a noise detector disposed in the machine compartment for detecting noise produced from driving o... | 06/30/1992 |
| 5093864 | Silencer A silencer for deadening noise produced with drive of a motor-compressor disposed in a machine compartment of a refrigerator includes a data storage for previously storing sound wave data for every starting condition of the compressor, the sound wave data... | 03/03/1992 |
| 5052041 | Silencer A silencer for refrigerators includes a microphone for detecting noise produced by a compressor disposed in a machine compartment and converting the noise to an electrical signal, a signal converter converting the electrical signal generated by the microp... | 09/24/1991 |
| 5046874 | Impact printer print head with active sound pressure attenuation means An improved impact printer print head is provided that includes the means for active attenuation of acoustic emission in the vicinity of the print head in a printer. The print head incorporates an acoustic speaker in its assembly and/or construction. The ... | 09/10/1991 |
| 5029218 | Noise cancellor A noise cancellor includes a first sensor for detecting a noise generated from a driving device and converting the noise to electric signals. A signal processor receives the electric signals and forms control signals by multiplying the electric signals by... | 07/02/1991 |
| 4989252 | Silencer A silencer for refrigerators includes a microphone receiving sound from a motor-compressor mounted in a machine compartment to thereby generate an electrical signal in accordance with the received sound, a signal converter converting the electrical signal... | 01/29/1991 |
| 4947434 | Electronic attenuator An electronic attenuator uses a speaker which is sheet-like in shape and is made of a piezoelectric material for generating a reversal sound. The attenuator uses a microphone installed in a noise transmittable space for detecting a noise and uses a contro... | 08/07/1990 |
| 4153815 | Active attenuation of recurring sounds This invention concerns a method of, and apparatus for, reducing the ambient noise level at a location in the vicinity of a source of recurring noise. In its preferred embodiments the invention involves generating a series of cancelling noise signals whic... | 05/08/1979 |
