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Document Title |
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7602925 |
Audio feedback processing system
A signal processing system improves signal quality by accurately locating and eliminating a feedback signal in an input signal, such as an audio signal. The signal processing system interpolates...
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7548854 |
Architectural sound enhancement with pre-filtered masking sound
A unique, fully integrated, fully programmable, and highly flexible sound distribution system and methodology for providing masking sound, background music, and paging capabilities in up to eight...
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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,...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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6563931 |
Auditory prosthesis for adaptively filtering selected auditory component by user activation and method for doing same
An auditory prosthesis, and method, which is able to adapt better to filter out a selected unwanted portion of the auditory input signal by relying on a human activation, such as activation by the...
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6542611 |
Multi-state echo suppressor
An echo suppressor uses a multi-state operating sequence to provide non-disruptive monitoring of a remotely broadcast program during a performer's live performance at a local site. The operating...
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6535111 |
Wave-discriminating inductive electronic device
A wave-discriminating inductive electronic device includes a special integrated circuit that is inducible by a proximity feeble electromagnetic signal generated by a general mobile phone during...
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6466674 |
Method and apparatus for eliminating audio feedback
The present invention is embodied in a method and apparatus for eliminating audio feedback which includes an active microphone coupled to an amplifier which transmits signals received at the active...
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6442280 |
Apparatus detecting howling by decay profile of impulse response in sound system
A howling canceling apparatus is provided in a sound system containing a microphone, a loudspeaker and an amplifier for canceling howling which may occur by feedback of sound from the loudspeaker...
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6424720 |
Method and device for reducing multi-channel acoustic echo and adapting sound to space conditions
In order to reduce acoustic echo and restore stereophonic sound in a digital transmission system of sound signals on multiple transmission channels, between a local site and one or several remote...
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6404895 |
Method for feedback recognition in a hearing aid and a hearing aid operating according to the method
In a method for feedback recognition in a hearing aid and a hearing aid operating according to the method, a frequency band is defined, a first signal level in the frequency band is determined, the...
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6252969 |
Howling detection and prevention circuit and a loudspeaker system employing the same
A howling detection and prevention circuit which receives an output of a microphone as its input signal and detects howling therein includes a computing section which divides frequency of the input...
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6252967 |
Reducing acoustic feedback with digital modulation
Sound is converted into an electrical signal by a microphone and is converted into an inaudible, digitally modulated signal that is combined with the electrical signal from the microphone,...
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6125187 |
Howling eliminating apparatus
Disclosed howling eliminating apparatus comprises frequency analyzing means 32 for detecting a frequency which causes howling, band eliminating means 20 for eliminating a band including the howling...
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5999631 |
Acoustic feedback elimination using adaptive notch filter algorithm
Techniques for reducing unwanted acoustic feedback in a space are carried out by an adaptive notch filter algorithm that adjusts a notch to a plurality of different notch values in order to locate...
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5920633 |
Thin-wall multi-concentric cylinder speaker enclosure with audio amplifier tunable to listening room
An acoustic transmission line speaker enclosure with concentric cylindrical structures establishes acoustic coupling between a rear-traveling sound wave and a surrounding air mass. Inherent...
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5910994 |
Method and apparatus for suppressing acoustic feedback in an audio system
A method (FIGS. 6-8) for detecting and attenuating N feedback frequencies in a digitized signal uses a tree structure containing a plurality of staged filters. In a step (602), an array of digital...
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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...
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5771440 |
Communication device with dynamic echo suppression and background noise estimation
Echo suppression is accomplished by comparing the ratio of the microphone (101) and speaker (121) energies to a dynamic threshold that varies with the background noise (310) at a second...
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5768398 |
Signal amplification system with automatic equalizer
A signal amplification system wherein a signal coming from a microphone is applied to a loudspeaker via a signal processing system. The signal processing system includes an estimator for estimating...
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5748751 |
Signal amplifier system with improved echo cancellation
In a signal amplifier system, a microphone (2) is connected to an echo canceller (16) via a decorrelator (6). The output signal of the echo canceller (16) is amplified by an amplifier (14) and fed...
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5729614 |
Howling remover composed of adjustable equalizers for attenuating complicated noise peaks
In an apparatus for amplifying a sound while suppressing a howling noise, a microphone collects a sound and converts the collected sound into a corresponding input signal. An amplifier amplifies...
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5710823 |
Howling remover having cascade connected equalizers suppressing multiple noise peaks
A howling prevention apparatus prevents a howling noise which is generated in a sound amplification system using a microphone and a loudspeaker. The howling prevention apparatus utilizes a plural...
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5680467 |
Hearing aid compensating for acoustic feedback
A hearing aid with digital, electronic compensation for acoustic feedback includes a microphone, a preamplifier, a digital compensation circuit and output amplifier and a transducer. The digital...
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5677987 |
Feedback detector and suppressor
An A/D converter converts an analog signal to a digital signal. A plurality of cascade-connected notch filters include a first notch filter which is connected to the output of the A/D converter. A...
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5664019 |
Systems for feedback cancellation in an audio interface garment
An audio interface garment includes systems for attenuating the influence of sound waves generated by audio output devices on output signals from a plurality of input devices an. In one embodiment,...
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5661814 |
Hearing aid apparatus
The acoustical-mechanical disturbance feedback between the electrical-acoustical converter and the acoustical-electrical converter of a hearing aid apparatus is compensated by means of an adaptive...
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5649019 |
Digital apparatus for reducing acoustic feedback
Sound is converted into an electrical signal by a microphone and is converted into an inaudible, pulse width modulated signal that is combined with the electrical signal from the microphone,...
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5642425 |
Sound field control device
A sound field control device includes an acoustic feedback signal path including a chamber and one or more loudspeaker or loudspeakers and one or more microphone or microphones provided in the...
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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...
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5475759 |
Electronic filters, hearing aids and methods
An electronic filter for an electroacoustic system. The system has a microphone for generating an electrical output from external sounds and an electrically driven transducer for emitting sound....
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5454041 |
Mix-minus monitor system
Disclosed is a mixer console which is capable of providing a mix-minus audio monitor signal to several locations from which an input audio signal is provided. The mix-minus audio signal consists of...
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5442712 |
Sound amplifying apparatus with automatic howl-suppressing function
A sound signal picked-up by a microphone is processed in a howl suppresser including a digital filter. A frequency analyzer performs frequency analysis of the picked-up sound signal. A howl...
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