Did You Know...
...that after Parker Brothers executives turned down the game of Monopoly because it had "52 fundamental errors" (including taking too long to play), a copy of the game wound up in the home of the company president who stayed up until 1 a.m. to finish playing it? He was so impressed by the game that the next day he wrote to inventor Charles Darrow and offered to buy it!
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 6041126 | Noise cancellation system A noise controlled type handset processes the output of non-directional noise detector installed outside of the handset by a first adaptive filter, delivers a control sound from a control speaker, controls the first adaptive filter so that the output of a... | 03/21/2000 |
| 5987144 | Personal active noise cancellation method and device having invariant impulse response A selected electrical signal is first applied to the input of a source (30) to determine at least the impulse response (H), over a predetermined time, between the source output and the input of sensors (20). The values of the active cancellation control s... | 11/16/1999 |
| 5937070 | Noise cancelling systems A first major aspect of the invention relates to an active noise cancelling system which detects ambient noise and applies electro-accoustic processing thereto to produce an acoustic signal for cancelling out the ambient noise. The active noise cancelling... | 08/10/1999 |
| 5862234 | Active noise cancellation system A bilateral transducer (18) for use in an active noise cancellation system both senses ambient noise and produces acoustic waves to cancel the noise. The electrical interface for each bilateral transducer circuit consists of a speaker drive signal as an i... | 01/19/1999 |
| 5852667 | Digital feed-forward active noise control system A method of noise control of an acoustic signal comprising: obtaining a reference signal of the acoustic signal to be controlled, applying an antinoise signal to the acoustic signal so as to control the acoustic signal, obtaining an error signal resulting... | 12/22/1998 |
| 5844996 | Active electronic noise suppression system and method for reducing snoring noise A system for attenuating noise which can be sensed by the auditory nerve comprising a microphone positioned in a first sound region for sensing noise present in the first sound region for creating a first electrical signal having a frequency and amplitude... | 12/01/1998 |
| 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 |
| 5815582 | Active plus selective headset An active plus selective headset system for provision of active attenuation of broadband noise as well as speech filtering comprising a headset with reference microphones, residual microphones and speakers on each of a pair of open backed muffs and a cont... | 09/29/1998 |
| 5812678 | Auscultation augmentation device A noise-canceling biological sound monitoring system provides electronic noise cancellation at the pickup head by using a primary transducer to sense anatomy sounds and a secondary sensor as a noise monitor. The system philosophy emphasizes the capability... | 09/22/1998 |
| 5774565 | Electronic cancellation of ambient noise in telephone headset Noise reducing circuits for electronic receiving instruments, such as telephone receivers in headsets or handsets that are used in noisy locations, provide compensation of the set's receiver unit-to-error microphone transfer function to enhance the noise ... | 06/30/1998 |
| 5740257 | Active noise control earpiece being compatible with magnetic coupled hearing aids Active noise control for use by individuals using magnetically coupled hearing aids is realized by generating a true representation of the handset input signal, which is employed to drive a separate external field coil. The external field coil is position... | 04/14/1998 |
| 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 |
| 5715321 | Noise cancellation headset for use with stand or worn on ear A self-supporting headset worn on the ear of a user without a headband or placed in a stand as a desk-top microphone system by a switch-function installed in the headset. The headset includes a housing which accommodates a receiver, an arcuate earband con... | 02/03/1998 |
| 5699436 | Hands free noise canceling headset In the area of active noise cancellation headsets, the noisy environment often encountered in the link with communication systems causes lack of intelligibility on the outward communications path. Consequently another in-wire cancellation channel to enhan... | 12/16/1997 |
| 5610987 | Active noise control stethoscope An active noise control stethoscope enables a physician or paramedic to check vital signs in the presence of high background noise levels. A digital processing technique is used to remove noise from the output of a main detection sensor, the detector bein... | 03/11/1997 |
| 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 |
| 5600729 | Ear defenders employing active noise control An ear defender having one or more microphones (1) for detecting the sound level in the proximity of the wearer's ear, one or more speakers (4) for generating a noise reduction signal within the earshell, and a digital feedback controller (W) for generati... | 02/04/1997 |
| 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 |
| 5568557 | Active vibration control system for aircraft An active noise and vibration reduction system for canceling noise in aircraft or other passenger carrying transportation systems which utilizes a series of seat mounted microphones and trim mounted speakers in conjunction with a digital controller with a... | 10/22/1996 |
| 5559893 | Method and device for active noise reduction in a local area A method for active noise reduction based on destructive interference of sound waves in order to reduce the energy in a sound field employs two omnidirectional microphones (M1, M2) provided in connection with a loudspeaker. The acoustic feedback of the mi... | 09/24/1996 |
| 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 |
| 5539831 | Active noise control stethoscope An active noise control stethoscope enables a physician or paramedic to check vital signs in the presence of high background noise levels. A digital processing technique is used to remove noise from the output of a main detection sensor, the detector bein... | 07/23/1996 |
| 5524058 | Apparatus for performing noise cancellation in telephonic devices and headwear A noise cancellation module is combined with a telephone handset or article of headwear to cancel a selected frequency or range of frequencies so as to enable a user to better use the handset and function with the headwear in place.... | 06/04/1996 |
| 5497426 | Stethoscopic system for high-noise environments An electronic stethoscopic system is described which permits detection of auscultory sounds in a patient in high noise environments such as ambulances and aircraft. The stethoscope employs an electroacoustical transducer, an acoustical driver mounted in a... | 03/05/1996 |
| 5481615 | Audio reproduction system An improved audio system designed to maintain a desired sound at the ear of a listener by using an equalization filter (2). The equalization filter (2) is continuously adjusted in response to the signal (9) from a sensor (8) which monitors the sound close... | 01/02/1996 |
| 5452361 | Reduced VLF overload susceptibility active noise cancellation headset The susceptibility of an active noise cancellation system to overloading due to very low frequencies is reduced by subtracting the low frequency components of an applied noise field from the residual signal. Low frequency components of the applied noise f... | 09/19/1995 |
| 5416846 | Noise control system and method The noise control system of this invention includes: a noise detector for detecting a noise generated from a noise source in order to output a noise detection signal; an adaptive filter portion for outputting a control signal based on the noise detection ... | 05/16/1995 |
| 5381485 | Active sound control systems and sound reproduction systems With reference to FIG. 1, an active sound control system comprises a loudspeaker LS having an input qs and operable to generate sound waves for interference with unwanted sound so as to produce a region close to the user of the system in which the perceiv... | 01/10/1995 |
| 5375174 | Remote siren headset A wireless remote active noise canceling headset including residual microphones (35, 34) mounted on the headset (30) with speakers (32, 33) located adjacent to the residual microphones and an algorithm driven synchronous controller to operate said headset... | 12/20/1994 |
| 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 |
| 5251263 | Adaptive noise cancellation and speech enhancement system and apparatus therefor Disclosed is a headset apparatus for use in an intercommunications system, the headset suppressing both noise in the vicinity of a transducer delivering sound to an operator's ear and in outgoing speech from the operator.... | 10/05/1993 |
| 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 |
| 5138663 | Method and apparatus for performing noise cancelling and headphoning A device for performing electroacoustic functions including noise cancellation, communication interface, and headphone functions. The device includes a composite transducer which is connected to a control unit. The composite transducer, which is adapted f... | 08/11/1992 |
| 5134659 | Method and apparatus for performing noise cancelling and headphoning A device for performing electroacoustic functions including noise cancellation, communication interface, and headphone functions. The device includes a composite transducer which is connected to a control unit. The composite transducer, which is adapted f... | 07/28/1992 |
| 5133017 | Noise suppression system A noise cancellation system, comprising a symmetrical assembly of microphone inputs is disclosed. A controller receives the output of the microphone assembly and generates an electrical cancellation signal having a polarity opposite the polarity of a port... | 07/21/1992 |
| 5091954 | Noise reducing receiver device The present invention is concerned with a receiver device for converting electrical signal from a headphone, a telephone receiver or the like into acoustic signals. More particularly, it relates to a noise reducing receiver device in which acoustic signal... | 02/25/1992 |
