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| Number | Title | Issue Date |
| 7362658 | Insect repelling system using feedback An insect repelling system includes (1) a microphone for converting pressure waves generated by a flying insect flapping its wings into electrical signals, and (2) a speaker for generating pressure waves toward the flying insect based on the electrical signals. ... | 04/22/2008 |
| 7355364 | Motor and controller inversion: commanding torque to position-controlled robots Systems and methods are presented that cancel the dynamics of a motor and a joint controller in the presence of communication time delays, measurement noise, and controller parameter uncertainties inherent in a robot system. A cancellation system includes feedback o... | 04/08/2008 |
| 7103188 | Variable gain active noise cancelling system with improved residual noise sensing An active noise cancellation system includes a series of features for more effective cancellation, greater reliability, and improved stability. A particular feature adapted for headset systems includes locating a residual microphone radially offset from the center o... | 09/05/2006 |
| 7088832 | IFB system apparatus and method The present invention provides a cancellation signal which may be combined with a radio or television program signal to provide a mix minus signal for use in IFB communication with the talent. A cancellation signal circuit is responsive to a talent signal to delay a... | 08/08/2006 |
| 7088828 | Methods and apparatus for providing privacy for a user of an audio electronic device The invention is directed to techniques for suppressing the voice of a user of an audio electronic device, such as a mobile phone, from being heard by an unintended listener. In one arrangement, the invention includes an input microphone, an electronics module, and ... | 08/08/2006 |
| 7076421 | Method and system for supporting increased channel density An exemplary multi-channel speech processor comprises a controller capable of interfacing with a plurality of channels, and at least one signal processing unit (SPU) coupled to the controller, where the multi-channel speech processor has a maximum execution time for... | 07/11/2006 |
| 7031460 | Telephonic handset employing feed-forward noise cancellation A telephonic handset comprises an active noise reduction (ANR) system. The ANR system comprises a reference microphone and an IIR filter. The IIR filter is receivingly coupled to the reference microphone with respect to noise reference signals, and it is transmittin... | 04/18/2006 |
| 7006461 | Method and system for a channel selective repeater with capacity enhancement in a spread-spectrum wireless network The present invention relates to a system and method for extending the coverage area and communication capacity of a spread-spectrum based wireless network through the use of intelligent repeaters. The system comprises a wireless communication network augmented with... | 02/28/2006 |
| 6990207 | Active noise control system An active noise control system for reducing road noise of low frequency generated inside the cabin of a vehicle is provided. The active noise control system includes a noise detector, a signal generator for processing the input noise signal to generate a signal for ... | 01/24/2006 |
| 6944303 | Noise cancellation device, engine-noise cancellation device, and noise cancellation method A phase-locked loop (PLL) circuit generates a sine wave signal synchronized with an input signal. The sine wave signal is directly supplied to a first multiplier. The sine wave signal is also supplied to a second multiplier after shifting the phase by 90 degrees by ... | 09/13/2005 |
| 6688422 | Method and apparatus for actively influencing the intake noise of an internal combustion engine A method and apparatus for actively influencing the intake noise of an internal combustion engine. The apparatus comprises a controller (7) which senses the actual noise (I) via a microphone (16) and compares the actual noise with a reference noise signal... | 02/10/2004 |
| 6625287 | Enhancing automatic noise reduction using negative output resistance An Automatic Noise Reduction system wherein the Q of the frequency response is reduced using a negative output resistance to substantially eliminate the coil resistance of a speaker in a headset. The resulting system is less sensitive to variations in ope... | 09/23/2003 |
| 6449369 | Method and device for hybrid active attenuation of vibration, particularly of mechanical, acoustic or similar vibration A filtering device consisting of a nonadaptive feedback filter that generates active attenuation of the vibration on the framework, without generating instability in a first frequency band, and an adaptive feedforward filter is disclosed. Feedforward filt... | 09/10/2002 |
| 6320968 | Adaptive noise rejection system and method An adaptive noise rejection method and apparatus. An information signal having an information component and a repetitive noise component having a varying characteristic frequency is delayed the information signal by a reference delay time that is equal th... | 11/20/2001 |
| 6278786 | Active noise cancellation aircraft headset system An active noise cancellation aircraft headset system. A speaker is mounted within each earcup of a headset for receiving and acoustically transducing a composite noise cancellation signal. A microphone is also mounted within each earcup for transducing ac... | 08/21/2001 |
| 6259792 | Waveform playback device for active noise cancellation A noise environment is sampled via microphone. A processor generates a cancellation signal to offset the effects of the noise to a listener. The cancellation signal is converted into a sample signal compatible with a synthesizer. The synthesizer adjusts t... | 07/10/2001 |
| 6151397 | Method and system for reducing undesired signals in a communication environment Methods and devices for reducing undesired signals in a communication environment. At least two distinct composite signals (X1 and X2) are transmitted from a first communication environment (260). A noise coefficient of the first com... | 11/21/2000 |
| 6061456 | Noise cancellation apparatus Disclosed is a transducer for use in a noise cancellation apparatus for reducing background noise. The transducer includes a housing having first microphone means for receiving a first acoustic sound composed of speech originating from an operator operati... | 05/09/2000 |
| 5848169 | Feedback acoustic energy dissipating device with compensator An acoustic energy dissipating device (100) comprises an acoustic driver (112) coupled to an acoustic medium and an acoustic sensor (110) for detecting a pressure of the acoustic medium near the acoustic driver. An inverting amplifier (115) and a compensa... | 12/08/1998 |
| 5825897 | Noise cancellation apparatus This invention relates to a method and an apparatus for reducing ambient noise for use with a headset or a boom headset attached to a boom microphone device or the like. The apparatus can include a sensor microphone to detect a background noise signal, a ... | 10/20/1998 |
| 5781640 | Adaptive noise transformation system A system for suppressing the effects of undesirable noise from an annoying noise source contains a plurality of transformation sounds which, when combined with the noise form a sound that is pleasing to the ear. The transformation sounds are stored in the... | 07/14/1998 |
| 5732143 | Noise cancellation apparatus This invention relates to a method and an apparatus for reducing ambient noise for use with a headset or a boom headset attached to a boom microphone device or the like. The apparatus can include a sensor microphone to detect a background noise signal, a ... | 03/24/1998 |
| 5638454 | Noise reduction system A system for reducing periodic noise, which includes a plurality of harmonically related noise signals, comprises an actuator for producing a canceling acoustic signal, a sensor for detecting a residual noise signal, a synchronizing signal generator and p... | 06/10/1997 |
| 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 |
| 5619581 | Active noise and vibration cancellation system An active noise and vibration control system (20) for cancellation of noise or vibration. The system (20) provides a system whereby the adaptation path and feedforward path are implemented in separate hardware. As a result, the computational burden on the... | 04/08/1997 |
| 5604813 | Industrial headset This invention relates to the various features of a headset design that utilizes active noise cancellation. This particular design has been developed to work with radio communication systems, but many features are applicable to headsets designed solely fo... | 02/18/1997 |
| 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 |
| 5488666 | System for suppressing sound from a flame A system for suppressing sound from a flame comprises a detector for detecting a first signal which emanates from the flame. A photo sensor rapidly detects the noise from the flame. The first signal is inverted to produce a second signal. The second signa... | 01/30/1996 |
| 5440642 | Analog noise cancellation system using digital optimizing of variable parameters A digitally controlled analog cancellation system containing an analog noise cancellation circuit with a residual microphone (39) with a digital virtual earth controller (40) for optimizing variable parameters employed in the analog cancellation circuit.... | 08/08/1995 |
| 5412735 | Adaptive noise reduction circuit for a sound reproduction system A noise reduction circuit for a hearing aid having an adaptive filter for producing a signal which estimates the noise components present in an input signal. The circuit includes a second filter for receiving the noise-estimating signal and modifying it a... | 05/02/1995 |
| 5371801 | Energy absorption apparatus Apparatus for absorbing acoustic energy directed toward a wall. The appars includes a piezoelectric layer intermediate the wall and the source of the acoustic energy. Circuitry attached to the output of the transducer compensates blocked and motional cap... | 12/06/1994 |
| 5363451 | Method and apparatus for the active reduction of compression waves An apparatus for reducing noise characterized by a number of input microphones arranged near an undesired noise source, a signal processor coupled to the input microphones and operative to develop a number of output signals from the input signals, and a n... | 11/08/1994 |
| 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 |
| 5305387 | Earphoning An earphone for use in an active noise reduction system includes a shell accommodating a microphone closely adjacent to a driver shaped and sized to fit in the concha of an ear.... | 04/19/1994 |
| 5276740 | Earphone device An earphone device includes an acoustic tube having an inner diameter substantially identical to that of the external auditory canal has an ear mounting portion at one end and an acoustic non-reflecting portion at the outer end. An earphone unit and an in... | 01/04/1994 |
| 5267321 | Active sound absorber The Active Sound Absorber of the invention is based on an electroacoustical transceiver defined as a bilateral electroacoustical transducer acting as both a diaphragm actuator and motion sensor, and an associated mutual inductance discriminator, in a elec... | 11/30/1993 |
| 5221185 | Method and apparatus for synchronizing rotating machinery to reduce noise A system for reducing noise created by multiple rotating machines by synchronizing the machines so as to establish a phase relationship between the machines which minimizes the noise. One or more feedback sensors, such as microphones, are placed so as to ... | 06/22/1993 |
| 5182774 | Noise cancellation headset A headset for acoustic reproduction of an electronic signal which electronic signal is representative of the summation of a desired audio signal and an anti-noise signal. The headset includes a headband, an earcup mounted to the headband, a driver mounted... | 01/26/1993 |
| 5138664 | Noise reducing device This invention is concerned with a device for reducing the external noise reaching the ear in extremely noisy places such as in the vehicle or construction sites. According to the present invention, the external noise in picked up by a microphone provided... | 08/11/1992 |
| 5047736 | Selective interference reduction in transmission lines Devices and methods for selectively reducing an electromagnetic or acoustic interference present in a transmission line by an active adaptive means, are described. For the electromagnetic interference, the transmission line may include a waveguide carryin... | 09/10/1991 |
