Abstract: A system and method of dynamic search result permission checking. A system that provides end users the ability to search an index (i.e., Shinydocs Index) built from content from one or multiple source repositories, and only display results for which the user has sufficient permissions at source to view. User credentials are validated “on the fly”, such that these checks are performant across a multiple of possible back-end repositories sequentially or simultaneously. The resultant search results from the Index may be sourced from many disparate repositories, each of which have their own unique permission structure (to view individual items). A method for handling permissions in multiple repositories in a secure (yet performant) fashion in order to only display search results that the end-user is allowed to view based on source system permissions.

Abstract: An audio system for an ear mountable playback device comprises a compensation filter configured to generate a third compensation signal by applying filter operations to an audio signal, and an error compensation unit configured to generate a compensated error signal on the basis of the third compensation signal and a disturbed audio signal from an error microphone. The audio system further comprises a first noise filter configured to be adapted based on the compensated error signal, and a detection unit configured to estimate the acoustic leakage condition on the basis of the first noise filter or of the disturbed audio signal and an audio output signal. The compensation filter is configured to be adapted based on the acoustic leakage condition.

Abstract: A noise cancellation enabled headphone to be worn on or over an ear of a user includes a speaker, a feed-forward microphone predominantly sensing ambient sound, an error microphone being arranged in front of the speaker in a primary direction of sound emission of the speaker and adapted to sensing sound being output from the speaker and ambient sound. A baffle is arranged between the speaker and the error microphone in the primary direction of sound emission such that the sound being output from the speaker is delayed by the baffle at a location of the error microphone. An adaptive noise cancellation controller is configured to perform feed-forward noise cancellation based on a feed-forward signal recorded with the feed-forward microphone and filtered with feed-forward filter parameters, and to adjust the feed-forward filter parameters based on an error signal recorded with the error microphone.

Abstract: An audio system for an ear mountable playback device comprises a speaker, an error microphone configured to predominantly sense sound being output from the speaker and a further microphone configured to predominantly sense ambient sound. The system further comprises a first noise filter coupling the further microphone to the speaker, a second noise filter coupling the error microphone to the speaker and an adaptation engine. The adaptation engine is configured to adapt a response of the first noise filter depending on error signals from at least the error microphone, estimate a leakage condition from the response of the first noise filter, and adapt a response of the second noise filter depending on the estimated leakage condition.

Abstract: An audio system for an ear mountable playback device includes a speaker, an error microphone, which senses sound being output from the speaker, and a sound control processor. The processor is configured for controlling and/or monitoring a playback of a detection signal or a filtered version of the detection signal via the speaker, recording an error signal from the error microphone, and determining whether the playback device is in a first state, where the playback device is worn by a user, or in a second state, where the playback device is not worn by a user, based on processing of the error signal.

Abstract: An audio system for an ear mountable playback device comprises a speaker, an error microphone predominantly sensing sound being output from the speaker and a feed-forward microphone predominantly sensing ambient sound. The audio system further comprises a voice activity detector which is configured to record a feed-forward signal from the feed-forward microphone. Furthermore, an error signal is recorded from the error microphone. A detection parameter is determined as a function of the feed-forward signal and the error signal. The detection parameter is monitored and a voice activity state is set depending on the detection parameter.

Abstract: A method for tuning filter parameters of a noise cancellation enabled audio system with an ear-mountable playback device comprising a speaker and a feedback noise microphone located in proximity to the speaker comprises provision of acoustic transfer functions between the speaker and the feedback noise microphone, between the speaker and an eardrum, between an ambient sound source and the eardrum and between the ambient sound source and the feedback noise microphone. The parameters of a feedback filter function, which is designed to process a feedback noise signal, are tuned. A noise cancellation performance of the audio system at the eardrum is determined based on each of the acoustic transfer functions and on the feedback filter function.

Abstract: A noise cancellation system for an ear-mountable playback device having a speaker, a feedforward microphone and an error microphone comprises a filter chain for coupling the feedforward microphone to the speaker, the filter chain comprising a series connection or parallel connection of a coarse filter and a fine filter, and a noise control processor. The fine filter is formed of a set of sub-filters having a predefined frequency range, wherein the predefined frequency range of each of the sub-filters together forms an effective overall frequency range of the fine filter.

Abstract: An audio system for an ear mountable playback device comprises a compensation filter configured to generate a third compensation signal by applying filter operations to an audio signal, and an error compensation unit configured to generate a compensated error signal on the basis of the third compensation signal and a disturbed audio signal from an error microphone. The audio system further comprises a first noise filter configured to be adapted based on the compensated error signal, and a detection unit configured to estimate the acoustic leakage condition on the basis of the first noise filter or of the disturbed audio signal and an audio output signal. The compensation filter is configured to be adapted based on the acoustic leakage condition.

Abstract: An audio system for an ear mountable playback device comprises a speaker and an error microphone that is configured to sense sound being output from the speaker and ambient sound. The audio system further comprises a detection engine that is configured to determine a driver response between the speaker and the error microphone, and to estimate a leakage condition from the determined driver response.

Abstract: An audio system for an ear mountable playback device includes a speaker, an error microphone, which senses sound being output from the speaker, and a sound control processor. The processor is configured for controlling and/or monitoring a playback of a detection signal or a filtered version of the detection signal via the speaker, recording an error signal from the error microphone, and determining whether the playback device is in a first state, where the playback device is worn by a user, or in a second state, where the playback device is not worn by a user, based on processing of the error signal.

Abstract: An audio system for an ear mountable playback device comprises a speaker, an error microphone predominantly sensing sound being output from the speaker and a feed-forward microphone predominantly sensing ambient sound. The audio system further comprises a voice activity detector which is configured to record a feed-forward signal from the feed-forward microphone. Furthermore, an error signal is recorded from the error microphone. A detection parameter is determined as a function of the feed-forward signal and the error signal. The detection parameter is monitored and a voice activity state is set depending on the detection parameter.

Abstract: An audio system for an ear mountable playback device comprises a speaker, an error microphone configured to predominantly sense sound being output from the speaker and a further microphone configured to predominantly sense ambient sound. The system further comprises a first noise filter coupling the further microphone to the speaker, a second noise filter coupling the error microphone to the speaker and an adaptation engine. The adaptation engine is configured to adapt a response of the first noise filter depending on error signals from at least the error microphone, estimate a leakage condition from the response of the first noise filter, and adapt a response of the second noise filter depending on the estimated leakage condition.

Abstract: A noise cancellation enabled audio device, in particular a headphone, comprises a speaker which is arranged within the audio device and which has a preferential side for sound emission. The audio device further comprises a first cavity enclosing a first volume of air, where the first cavity is arranged at the preferential side for sound emission of the speaker, and an error microphone which is arranged within a second cavity within the audio device. The first cavity comprises a first opening to the outside of the audio device and the second cavity comprises a second opening to the outside of the audio device. The first and the second opening are both arranged on a side of the audio device which is arranged to face an ear canal of a user. Furthermore, a noise cancellation system is provided.

Abstract: A noise cancellation filter structure for a noise cancellation enabled audio device, in particular headphone, comprises a noise input for receiving a noise signal and a filter output for providing a filter output signal. A first noise filter produces a first filter signal by filtering the noise signal and a second noise filter produces a second filter signal by filtering the noise signal. The second noise filter has a frequency response with a non-minimum-phase, in particular maximum-phase. A combiner is configured to provide the filter output signal based on a linear combination of the first filter signal and the second filter signal.

Abstract: A method for tuning filter parameters of a noise cancellation enabled audio system with an ear-mountable playback device comprising a speaker and a feedback noise microphone located in proximity to the speaker comprises provision of acoustic transfer functions between the speaker and the feedback noise microphone, between the speaker and an eardrum, between an ambient sound source and the eardrum and between the ambient sound source and the feedback noise microphone. The parameters of a feedback filter function, which is designed to process a feedback noise signal, are tuned. A noise cancellation performance of the audio system at the eardrum is determined based on each of the acoustic transfer functions and on the feedback filter function.

Abstract: A noise cancellation headphone comprises a speaker, a front plate for carrying the speaker, a microphone arranged on or in the front plate, and a front vent opening arranged within the front plate and in close proximity to the microphone. The microphone is usable as a feedback microphone for active noise cancellation.

Abstract: A noise cancellation enabled audio device (20), in particular a headphone, comprises a speaker (21) which is arranged within the audio device (20) and which has a preferential side (36) for sound emission. The audio device (20) further comprises a first cavity (22) enclosing a first volume of air, where the first cavity (22) is arranged at the preferential side (36) for sound emission of the speaker (21), and an error microphone (23) which is arranged within a second cavity (24) within the audio device (20). The first cavity (22) comprises a first opening (25) to the outside of the audio device (20) and the second cavity (24) comprises a second opening (26) to the outside of the audio device (20). The first and the second opening (25, 26) are both arranged on a side of the audio device (20) which is arranged to face an ear canal (27) of a user. Furthermore, a noise cancellation system (30) is provided.

Abstract: A noise cancellation system for a noise cancellation enabled audio device comprises a first noise filter and a second noise filter, each being designed to process a noise signal, a combiner and an adaptation engine. The first noise filter has a first fixed frequency response matched to a high leakage condition of the audio device. The second noise filter has a second fixed frequency response matched to a low leakage condition of the audio device. The combiner is configured to provide a compensation signal based on a combination of an output of the first noise filter amplified with a first adjustable gain factor and an output of the second noise filter amplified with a second adjustable gain factor. The adaptation engine is configured to estimate a leakage condition of the audio device based on an error noise signal and to adjust at least one of the first and the second adjustable gain factors based on the estimated leakage condition.

Abstract: A noise cancellation headphone comprises a speaker, a front plate for carrying the speaker, a microphone arranged on or in the front plate, and a front vent opening arranged within the front plate and in close proximity to the microphone. The microphone is usable as a feedback microphone for active noise cancellation.