Did You Know...
...that a workman who left the soap mixing machine on too long was responsible for making Ivory Soap? He was so embarrassed by his mistake that he threw the mess in a stream. Imagine his dismay when the evidence of his error floated to the surface! Result: Ivory soap, the soap that floats.
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| Number | Title | Issue Date |
| 8098841 | Sound field controlling apparatus A sound field controlling apparatus for a public-address system comprises a microphone that picks up a sound of a speaker, a loudspeaker that sound a sound signal based on the sound picked up by the microphone, a sound source position detector that detects a positio... | 01/17/2012 |
| 7899195 | Adaptive howling canceller An adaptive howling canceller has a plurality of adaptive filters. A delay adds a time delay of an acoustic feedback path to an electric signal fed from an amplifier of a sound-reinforcement system. Each adaptive filter filters the output signal of the delay with a ... | 03/01/2011 |
| 7760888 | Howling suppression device, program, integrated circuit, and howling suppression method Howling, which occurs when amplifying a target sound collected by a first microphone through an amplification section and outputting the amplified sound as an intensified sound from a loudspeaker, is suppressed using a first and second acoustic signal. A first power... | 07/20/2010 |
| 7386142 | Method and apparatus for a hearing assistance system with adaptive bulk delay A hearing assistance system having adjustable bulk delay for cancellation of a time varying acoustic feedback path. The hearing assistance system including an FIR filter, coefficient update module, and delay rules module for programmable adaptive filtering. The hear... | 06/10/2008 |
| 7302062 | Audio enhancement system An audio enhancement system for compensating for ambient noise in a listening environment, comprises an audio system that produces an electrical sound signal and generates a sound output from the electrical sound signal. A sensor (e.g., a microphone) senses a total ... | 11/27/2007 |
| 7295670 | Howling suppression device and howling suppression method An acoustic feedback suppression apparatus according to the present invention comprises a notch filter (109) for filtering out acoustic feedback components, a plurality of first sample fast Fourier transformation means (118 to 120) for performin... | 11/13/2007 |
| 7292699 | Band-limited adaptive feedback canceller for hearing aids An improved method for adaptively cancelling acoustic feedback in hearing aids and other audio amplification devices. Feedback cancellation is limited to a frequency band that encompasses all unstable frequencies. By limiting the bandwidth of the feedback cancellati... | 11/06/2007 |
| 7289626 | Enhancement of sound quality for computer telephony systems Techniques for enhancing the sound quality of computer telephony systems are provided. In general, digital signals including telephony sounds are converted from the time domain to the frequency domain. If noise is detected in the frequency domain conversion of the d... | 10/30/2007 |
| 7286674 | Method for designing a modal equalizer for a low frequency audible range especially for closely positioned modes The present invention relates to a method for designing a modal equalizer (5) for a low frequency audible range, typically for frequencies below 200 Hz for a predetermined space (1) (listening room) and location (2) (location in the room) therei... | 10/23/2007 |
| 7249511 | Method of detecting resonant frequency, method of selecting resonance frequency, and device for detecting resonant frequency sensor A device for detecting a resonant frequency comprises a sound source, a switch, a mixer, and a sound meter. The switch and mixer are capable of switching between a first state in which the switch and mixer output a measurement signal and a second state in which the ... | 07/31/2007 |
| 7227959 | Multi-channel digital feedback reducer system The present invention provides method and apparatus that improve processing of acoustic signals by reducing acoustic feedback in an acoustic system. An aspect of the invention is a multi-channel digital feedback reducer (DFR) system that comprises a plurality of cha... | 06/05/2007 |
| 7203324 | Audio feedback processing system This invention is an audio system capable of identifying frequencies of feedback signals and filters these feedback signals. Frequency interpolation is utilized on a sampled frequency spectrum signal corresponding to a feedback signal, where the frequency interpolat... | 04/10/2007 |
| 7190800 | Howling control device and howling control method A howling control apparatus and howling control method for controlling time up to the cancellation of howling suppression according to a howling occurrence situation, thereby eliminating the repetition of howling suppression and cancellation. A howling detecting sec... | 03/13/2007 |
| 7162044 | Audio signal processing Systems, devices, and methods are provided to inhibit at least one feedback component of an input audio signal by adjusting a feedback-inhibiting filter through a narrowband subaudible signal. The level of the signal may be determined using an audibility model so as... | 01/09/2007 |
| 7155022 | Electromagnetic feedback reduction in communication device The invention relates to a method for reducing feedback caused by electromagnetic interference between an induction coil and an output transducer, a voltage supply or an amplifier or a combination thereof, the method comprising: producing by means of a filter an equ... | 12/26/2006 |
| 7136495 | Loudspeaker device A loudspeaker device comprising a power amplifier (13) to which an input signal is delivered via a subtracter (6), a speaker unit (1) for reproducing output signals delivered from the power amplifier (13), an acoustic pipe (2) coup... | 11/14/2006 |
| 7133529 | Howling detecting and suppressing apparatus, method and computer program product Herein disclosed a howling detecting and suppressing apparatus for detecting and suppressing howling sound components comprising: a frequency dividing processing section for converting a plurality of sound time signal segments each corresponding to a time segment in... | 11/07/2006 |
| 7092532 | Adaptive feedback canceller A system and method for adaptively removing feedback in audio systems and, more particularly, hearing aid systems. The audio system comprises an analysis unit, for receiving an input signal and providing N bandpass input signals, and an adaptive feedback cancellatio... | 08/15/2006 |
| 7068798 | Method and system for suppressing echoes and noises in environments under variable acoustic and highly feedback conditions Method and system for canceling echoes and noises in environments with variable acoustic conditions and high feedback, such as the interior of an automotive vehicle, permitting audible communication between the occupants, comprising one/several microphone/s (1 | 06/27/2006 |
| 7054451 | Sound reinforcement system having an echo suppressor and loudspeaker beamformer A sound reinforcement system includes several microphones, a microphone beamformer coupled to the microphones, adaptive echo compensator (EC) coupled to the microphone beamformer for generating an echo compensated microphone signal, and several loudspeakers coupled ... | 05/30/2006 |
| 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 |
| 7027604 | Circuit to prevent acoustic feedback for a cellular speakerphone This invention includes a circuit for the prevention of acoustic feedback between an electronic device and an audio accessory. In a preferred embodiment, the circuit prevents audio feedback between a cellular telephone and a speakerphone accessory. The circuit inclu... | 04/11/2006 |
| 7024011 | Hearing aid with an oscillation detector, and method for detecting feedback in a hearing aid In a hearing aid having an oscillation detector and a method for establishing the presence of oscillations in a hearing aid, sinusoidal input signals of the microphone can be detected, and so oscillations that are present can also be detected. To this end, the numbe... | 04/04/2006 |
| 7013015 | Method for the operation of a hearing aid device or hearing device system as well as hearing aid device or hearing device system For reducing feedback-conditioned oscillations in a hearing aid device, microphone signals of a first microphone and of a distanced, second microphone are compared to one another. When oscillations are detected at the same frequency in both microphone signals, these... | 03/14/2006 |
| 6980663 | Process and device for compensating for signal loss For an especially low loss and echo free communication between several participants in a room (1) an inventive process for the compensation of losses of a signal(S) along a transmission path between at least one transmission point (6) and one receiving... | 12/27/2005 |
| 6940982 | Adaptive noise cancellation (ANC) for DVD systems An apparatus comprising an input, a noise cancellation circuit, an audio circuit and a mixing circuit. The input may be configured to receive one or more input signals. The noise cancellation circuit may be configured to generate a first processed audio signal havin... | 09/06/2005 |
| 6930702 | Device for positioning and operating audio and video equipment A mount for devices used in a teleconferencing site is disclosed. The mount positions and secures the devices in a substantially linear array along a wall of the teleconference site. The mount provides both power and communication connections to the each of t... | 08/16/2005 |
| 6931137 | Feedback compensation device and method, and hearing aid device employing same A feedback compensator for a hearing aid device has a filter arrangement that splits a signal path, to implement an adaptive feedback compensation with only one buffer memory, two splitting nodes, and two addition nodes. The feedback compensation ensues only in the ... | 08/16/2005 |
| 6914987 | Audio amplifier with voltage limiting in response to spectral content Audio signals are reproduced with consistent perception of total harmonic distortion even with varying spectral content of a particular audio signal without separately limiting different frequency bands within the audio signal. A distortion threshold representative ... | 07/05/2005 |
| 6910013 | Method for identifying a momentary acoustic scene, application of said method, and a hearing device The invention relates first of all to a method for identifying a transient acoustic scene, said method including the extraction, during an extraction phase, of characteristic features from an acoustic signal captured by at least one microphone (2a, ... | 06/21/2005 |
| 6906632 | Vehicular sound-processing system incorporating an interior mirror user-interaction site for a restricted-range wireless communication system The interior cabin of a vehicle is provided with a vehicular sound-processing system that comprises an interior rearview mirror assembly, the mirror assembly including a mirror housing and a reflective element. An accessory is located in the interior cabin. The inte... | 06/14/2005 |
| 6876751 | Band-limited adaptive feedback canceller for hearing aids An improved method for adaptively cancelling acoustic feedback in hearing aids and other audio amplification devices. Feedback cancellation is limited to a frequency band that encompasses all unstable frequencies. By limiting the bandwidth of the feedback cancellati... | 04/05/2005 |
| 6810124 | Adaptive resonance canceller apparatus An adaptive resonance canceller system and method for attenuating narrowband noise signals within an input signal, where the narrowband noise signals may vary significantly in frequency. The sensor comprises a notch filter, an error reference and gradient generator,... | 10/26/2004 |
| 6792114 | Integrated hearing aid performance measurement and initialization system A digital hearing aid according to the present invention is capable of measuring its own performance. The hearing aid includes a test signal generator for feeding a test signal into the hearing aid amplifier. The response to the test signal is acquired at a specific... | 09/14/2004 |
| 6724899 | Sound pick-up and reproduction system for reducing an echo resulting from acoustic coupling between a sound pick-up and a sound reproduction device A sound pick-up and reproduction system includes at least two sound sensors, such as microphones, situated at different distances from a sound reproduction device, such as a loudspeaker. A processor responds to amplitudes and phases of signals outputted by the at le... | 04/20/2004 |
| 6674863 | Microphone-speaker apparatus Herein disclosed is a microphone-speaker apparatus, comprising: audio signal dividing means for dividing the audio signal into a plurality of raw component signals each indicative of the raw wave components; coherent component signal extracting means for ... | 01/06/2004 |
| 6665411 | DVE system with instability detection A digital voice enhancement, DVE, communication system includes an instability detector detecting an unstable acoustic feedback condition from a loudspeaker to a microphone by sensing a condition of the electrical signal transmitted from the microphone to... | 12/16/2003 |
| 6625286 | Precise amplitude correction circuit Amplitude is corrected by subtracting a component signal from a composite signal to produce a remainder signal, correlating the remainder signal with the component signal to produce a product signal, averaging the product signal, and adjusting the magnitu... | 09/23/2003 |
| 6608898 | Band pass and notch filters for echo reduction with less phase distortion A complementary comb filter includes a plurality of band pass filters and a plurality of notch filters, wherein the notch filters have the same center frequencies as the band pass filters or the same center frequencies as the dead bands defined by the ban... | 08/19/2003 |
| 6594368 | DVE system with dynamic range processing A digital voice enhancement, DVE, communication system includes a dynamic range processor and method altering dynamic range of the electrical signal from the microphone to the loudspeaker by applying nonlinear and/or differential gain thereto, preferably ... | 07/15/2003 |
