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| Number | Title | Issue Date |
| 7756279 | Microphone preamplifier A microphone preamplifier, comprising a differential input (102) stage with a first and a second input terminal and an output stage with an output terminal; where the microphone preamplifier is integrated on a semiconductor substrate. A feedback circuit, with... | 07/13/2010 |
| 7688986 | Loudspeaker system A hands-free loudspeaker system which is capable of achieving high-quality voice amplification without requiring a human speaker to move to a microphone or a microphone to be moved to a human speaker. A microphone whose input level has continued to be above a thresh... | 03/30/2010 |
| 7358880 | Magnetic field feedback delta-sigma modulator sensor circuit A magnetic field feedback delta-sigma modulator sensor circuit, provides accurate magnetic field measurements without requiring complex additional calibration circuitry. The output of the semiconductor magnetic field sensor, which may be a Hall effect sensor, is cou... | 04/15/2008 |
| 7254245 | Circuit and method for adaptation of hearing device microphones The microphones used in hearing devices normally possess different characteristic lines that are to be adapted to one another. For this purpose, the amplitude of an output signal of a first microphone and the amplitude of an output signal of a second microphone are ... | 08/07/2007 |
| 7206404 | Communications system and method utilizing centralized signal processing A communications system and method performs centralized signal processing on received audio signals. A plurality of terminals are coupled to a processing switch via links. The terminals can be, for example, dedicated speakerphones, desktop handsets, or personal comp... | 04/17/2007 |
| 7123948 | Microphone aided vibrator tuning A method of tuning an alert device in a portable communication apparatus having a microphone. The method involves the steps of recording, through the microphone, an acoustic signal which is emitted by the alert device in response to a drive signal; deriving a charac... | 10/17/2006 |
| 7103392 | Wireless intercom system A wireless intercom unit includes an electronics housing including a first side, where the first side is configured to interface with a planar surface. The intercom unit also includes a microphone, a speaker, and an input device, where these components are located o... | 09/05/2006 |
| 7075921 | Remote media control for voice over internet telephony and related applications A person receiving a Voice over IP call, such as a call center agent, remotely controls media settings on a caller's multimedia terminal device functioning as a telephone terminal device. In some embodiments, the call center agent may remotely control media settings... | 07/11/2006 |
| 7072478 | Microphone preamplifier A microphone preamplifier. An electrical signal from a microphone is received via a shielded cable by an input stage cascaded with an output stage. The input stage contains an impedance converter and a phase inverter and receives feedback that reduces input capacita... | 07/04/2006 |
| 7062056 | Directional hearing aid tester Method and apparatus for testing a directional acoustic device such as a directional hearing aid having level-dependent non-linear circuitry, in which two or more speakers are placed at desired positions relative to the hearing aid, e.g. in front and behind the hear... | 06/13/2006 |
| 7058186 | Loudspeaker device An anti-oscillation loudspeaker device where a reproduced sound is compensated based on a acoustic signal detected by a microphone and a reproduced band is enlarged is provided. In this loudspeaker device, a microphone is placed near a position where sound pressure ... | 06/06/2006 |
| 7039197 | User interface for communication system An improved user interface is installed in the cabin of a vehicle incorporating a cabin communication system using acoustic echo cancellation for improving the ease and flexibility of the cabin communication. Separate controls at each seat location enable the person... | 05/02/2006 |
| 7010129 | Method and device for operating voice-controlled systems in motor vehicles A device for operating voice-controlled systems, such as communication and/or intercommunication systems in motor vehicles, includes a plurality of microphones and at least one loudspeaker. Voice signals received by the microphones are transmitted to the at least on... | 03/07/2006 |
| 6766025 | Intelligent speaker training using microphone feedback and pre-loaded templates A programmable speaker uses characterization data stored within the memory of the speaker and digital signal processing (DSP) to digitally perform transform functions on input audio signals to compensate for speaker related distortion and listening environment disto... | 07/20/2004 |
| 6285769 | Force balance microphone The present invention is a microphone that applies the principle of negative feedback directly to the diaphragm, greatly reducing the non-linearity of the diaphragm. In a further embodiment, digital negative feedback is used, incorporating the diaphragm i... | 09/04/2001 |
| 6192135 | Dearticulator An amusement and entertainment system where participants try to continuously speak and/or sing while simultaneously listening to their own voices on a 1/2 second sound delay. The confusing feedback does not act as a sound enhancement echo but instead caus... | 02/20/2001 |
| 6031922 | Microphone systems of reduced in situ acceleration sensitivity An electroacoustic assembly comprising a microphone having a diaphragm and supported on a face plate susceptible to vibratory effects. Vibration sensitivity is reduced by opposing the pressure effects on the diaphragm caused, on the one hand, by vibration... | 02/29/2000 |
| 5894523 | Voice delay feedback apparatus An audio delay and feedback apparatus includes i) a microphone for receiving an input audio signal and for generating a first electrical signal corresponding to the input audio signal, ii) a delay circuit for receiving the first electrical signal and for ... | 04/13/1999 |
| 5533120 | Acoustic feedback cancellation for equalized amplifying systems A speaker amplification system incorporates an adaptable notch filter that can dynamically adapt to the frequency of feedback oscillations caused by acoustic feedback frequency in order to remove the feedback oscillation before they are amplified above an... | 07/02/1996 |
| 5515445 | Long-time balancing of omni microphones The long term average broad band gains of a plurality of individual signal channels, associated with a corresponding plurality of microphone elements, are electronically and dynamically adapted to one another. This is realized by periodically and dynamica... | 05/07/1996 |
| 5506910 | Automatic equalizer An automatic equalizer sequentially adds subdued narrow band audio reference signals of different frequencies to an audio program signal being broadcast, and measures the magnitude of each successive broadcast reference signal to determine a measured freq... | 04/09/1996 |
| 5404397 | Conference system with automatic speaker detection and speaker unit A conference system comprises speaker units (12) coupled to a central unit (14). The speaker unit (12) comprises an echo canceller (20) with an adaptive filter (38) having an impulse response of comparatively short duration. In a speech pause of the user ... | 04/04/1995 |
| 5402497 | Headphone apparatus for reducing circumference noise A headphone apparatus includes a speaker unit accommodated in an accommodating member of an open-air type, a microphone disposed at a front side of the speaker unit, a circuit arrangement mounted on a circuit board in the speaker unit including a filter f... | 03/28/1995 |
| 5309517 | Audio multiplexer A multiplexer for mixing multiple audio inputs into a plurality of summed audio outputs in which computer-controlled sensors are associated with the amplifier components of the multiplexer for specific monitoring the voice levels and in association with t... | 05/03/1994 |
| 5218642 | Feedback noise-eliminating microphone circuit A feed-back noise-eliminating microphone circuit is provided. The circuit includes a positive-phase pick-up circuit to pick up sound source signal for amplification through a positive-phase amplifier for further output through a balance adjusting circuit ... | 06/08/1993 |
| 5003606 | Antihowling hearing aid In order to prevent howling in a hearing aid (10) having a microphone (1), an amplifier (3) and a receiver (4) the hearing aid is provided with a second microphone (2) which is only sensitive to sound near to it. The microphones (1, 2) are connected to th... | 03/26/1991 |
| 4644581 | Headphone with sound pressure sensing means Headphones have a small cavity between the diaphragm and the ear canal with a microphone in the cavity closely adjacent to the diaphragm slightly off the axis of the ear canal and headphone diaphragm with the microphone membrane perpendicular to the headp... | 02/17/1987 |
| 4598417 | Electronic stethoscope An electronic stethoscope for reproducing at a user's ear as exactly as possible the sound pressure signals originating from a conventional diaphragm or bell type of chestpiece. The subject electronic stethoscope utilizes a signal processing approach whic... | 07/01/1986 |
| 4455677 | Multipurpose headphone assembly A multipurpose electronic assembly for a headphone assembly used in connection with a stereophonic system, such system comprising detection and signal means to ascertain noises extraneous to the stereophonic output system. Such assembly comprises a pick-u... | 06/19/1984 |
| 4442323 | Microphone with vibration cancellation A microphone unit particularly adapted to be used as a built-in microphone for a device such as a tape recorder in which vibration-induced components in the output of the microphone are substantially eliminated. An electret-type microphone element is moun... | 04/10/1984 |
| 4417098 | Method of reducing the adaption time in the cancellation of repetitive vibration A method of reducing the adaption time needed to adapt a synthetically generated secondary waveform so that it nulls a primary repetitive waveform (e.g. noise) from a source (1) of vibration, the secondary waveform generation (5) being synchronized by the... | 11/22/1983 |
| 4395593 | Acoustic differential digital coder An arrangement for directly converting speech waves into coded digital signals includes a vibratory diaphragm secured at an aperture in a closed chamber. The diaphragm vibrates responsive to the difference between the speech waves and sound waves radiated... | 07/26/1983 |
