Abstract: A shaft bearing assembly having a shaft supported in a bearing housing is described. The shaft bearing assembly includes a pressure reduction device for generating an underpressure inside the bearing housing. The pressure reduction device is operated by employing an incompressible fluid. Further, a method of reducing a pressure inside a bearing housing supporting a shaft is described. The method includes using an incompressible fluid for operating a pressure reduction device for generating an underpressure inside the bearing housing.

Abstract: A shaft bearing assembly having a shaft supported in a bearing housing is described. The shaft bearing assembly includes a pressure reduction device for generating an underpressure inside the bearing housing. The pressure reduction device is operated by employing an incompressible fluid. Further, a method of reducing a pressure inside a bearing housing supporting a shaft is described. The method includes using an incompressible fluid for operating a pressure reduction device for generating an underpressure inside the bearing housing.

Abstract: The invention relates to an intake device for a compressor. The intake device comprises a support structure having a plurality of struts which are arranged in the circumferential direction about an axis of the support structure and extend in the radial direction. Furthermore, the intake device comprises a plurality of first sound-damping elements which are arranged in the radial continuation of the plurality of struts. In addition, the intake device comprises a plurality of second sound-damping elements, each of which is arranged between adjacent first sound-damping elements. The invention furthermore relates to an exhaust-gas turbocharger having the intake device according to the invention, and an internal combustion engine having an exhaust-gas turbocharger of this kind.

Abstract: A filter muffler includes a front element, a rear element, and a plurality of damping elements arranged between the front element and the rear element, where the damping elements are arranged radially around a central axis of the filter muffler such that a flow channel is formed between adjacent damping elements, where respective outflow-side ends of the damping elements have a diffuser element which has an outflow-side tapering, and where an angle ? between two opposite sides of the diffuser element is selected from a range of 1°???8°.

Abstract: A filter muffler includes a front element, a rear element, and a plurality of damping elements arranged between the front element and the rear element, where the damping elements are arranged radially around a central axis of the filter muffler such that a flow channel is formed between adjacent damping elements, where respective outflow-side ends of the damping elements have a diffuser element which has an outflow-side tapering, and where an angle ? between two opposite sides of the diffuser element is selected from a range of 1°???8°.

Abstract: The invention relates to a filter muffler (10) comprising a front element (11), a rear element (12), and a plurality of damping elements (20) which are arranged between the front element (11) and the rear element (12). The damping elements (20) are arranged radially about a central axis (16) of the filter muffler such that a flow channel (30) is formed between each pair of adjacent damping elements. The respective downstream ends (22) of the damping elements (20) each have a diffuser element (23) which has a downstream tapering. An angle ? between two opposing sides of the diffuser element (23) is selected from a range of 1°???8°.

Abstract: An active noise reduction (ANR) circuit includes a digital feed-forward ANR pathway coupled to a feed-forward microphone, to detect environmental sounds in an environment external to a casing, and to a first acoustic driver to output sounds within the casing. The digital feed-forward ANR pathway applies a plurality of filters using a first set of coefficients to convert signals from the feed-forward microphone to feed-forward anti-noise sounds to reduce environmental sounds within the casing. In response to a stimulus, the digital feed-forward ANR pathway applies the plurality of filters using a second set of coefficients, which reduce the degree of feed-forward ANR to enable human speech sounds in the environment external to the casing to be conveyed from the feed-forward microphone to the acoustic driver with less reduction than provided by the first plurality of filters.

Abstract: An active noise reduction (ANR) circuit includes a digital feed-forward ANR pathway coupled to a feed-forward microphone, to detect environmental sounds in an environment external to a casing, and to a first acoustic driver to output sounds within the casing. The digital feed-forward ANR pathway applies a plurality of filters using a first set of coefficients to convert signals from the feed-forward microphone to feed-forward anti-noise sounds to reduce environmental sounds within the casing. In response to a stimulus, the digital feed-forward ANR pathway applies the plurality of filters using a second set of coefficients, which reduce the degree of feed-forward ANR to enable human speech sounds in the environment external to the casing to be conveyed from the feed-forward microphone to the acoustic driver with less reduction than provided by the first plurality of filters.

Abstract: An active noise reduction (ANR) circuit includes a digital feed-forward ANR pathway coupled to a feed-forward microphone, to detect environmental sounds in an environment external to a casing, and to a first acoustic driver to output sounds within the casing. The digital feed-forward ANR pathway applies a plurality of filters using a first set of coefficients to convert signals from the feed-forward microphone to feed-forward anti-noise sounds to reduce environmental sounds within the casing. In response to a stimulus, the digital feed-forward ANR pathway applies the plurality of filters using a second set of coefficients, which reduce the degree of feed-forward ANR to enable human speech sounds in the environment external to the casing to be conveyed from the feed-forward microphone to the acoustic driver with less reduction than provided by the first plurality of filters.

Abstract: An active noise reduction (ANR) circuit includes a digital feed-forward ANR pathway coupled to a feed-forward microphone, to detect environmental sounds in an environment external to a casing, and to a first acoustic driver to output sounds within the casing. The digital feed-forward ANR pathway applies a plurality of filters using a first set of coefficients to convert signals from the feed-forward microphone to feed-forward anti-noise sounds to reduce environmental sounds within the casing. In response to a stimulus, the digital feed-forward ANR pathway applies the plurality of filters using a second set of coefficients, which reduce the degree of feed-forward ANR to enable human speech sounds in the environment external to the casing to be conveyed from the feed-forward microphone to the acoustic driver with less reduction than provided by the first plurality of filters.

Abstract: Apparatus and method for implementing a convertible filter in differing ones of its delay and weighting elements are powered through different power conductors, thereby enabling the convertible filter to be dynamically configured to be operable as different types of digital filter through selective provision of power to differing ones of the power conductors.

Abstract: In a personal ANR device having a pair of earpieces, each having a feedforward microphone and an ANR circuit associated therewith, each ANR circuit provides digital data representing environmental noise sounds detected by each ANR circuit's associated feedforward microphone. Such digital data may represent the environmental noise sounds as detected with little or not modification, or such digital data may be modified to some degree within each ANR circuit, perhaps to limit the range of frequencies that such digital data represents, before being provided to the other ANR circuit.

Abstract: An ANR circuit, possibly of a personal ANR device, monitors a sound level of environmental sounds detected by a microphone external to an earpiece in which the ANR circuit is providing feedback-based ANR, and increases or decreases the degree of feedback-based ANR provided in response to the external microphone detecting a higher or lower sound level, respectively. Increasing and decreasing the degree of feedback-based ANR provided may be carried out by changing a variable loop gain of the ANR circuit and/or a range of frequencies of environmental sounds attenuated by the feedback-based ANR.

Abstract: An ANR circuit, possibly of a personal ANR device, incorporates an signal processing topology to support the provision of feedback-based ANR, feedforward-based ANR and pass-through audio in which the topology incorporates a branch in which feedback anti-noise sounds are generated from feedback reference sounds received from a feedback microphone, a branch in which feedforward anti-noise sounds are generated from feedforward reference sounds, and a branch in which modified pass-through audio sounds are generated from pass-through audio sounds received from an audio source, wherein these three branches are combined to combine the generated sounds of each branch into a single output by which an acoustic driver, possibly of the personal ANR device, is driven.

Abstract: An ANR circuit, possibly of a personal ANR device, reduces the degree of feedforward-based ANR that it provides in response to receiving an indication of the operation of a manually-operable control. The reduction of degree of feedforward-based ANR may be effected by turning off or otherwise deactivating the provision of feedforward-based ANR, reducing a range of frequencies of environmental noise sounds attenuated by the feedforward-based ANR to provide less attenuation of sounds detected by a feedforward microphone that are in a range of frequencies deemed to be those of human speech, and/or creating a notch in the range of frequencies of environmental noise sounds attenuated by the feedforward-based ANR to provide less attenuation of sounds detected by the feedforward microphone that are in a range of frequencies deemed to be those of human speech.

Abstract: At initialization of an ANR circuit (i.e., at so-called boot time), attempts are made to alternately obtain ANR settings from an external storage device by operating the ANR circuit as a master of a bus and from an external processing device by operating the ANR circuit as a slave of the bus. Such alternating attempts may be repeated until the ANR settings are loaded.

Abstract: Apparatus and method for implementing a convertible filter in differing ones of its delay and weighting elements are powered through different power conductors, thereby enabling the convertible filter to be dynamically configured to be operable as different types of digital filter through selective provision of power to differing ones of the power conductors.

Abstract: An ANR circuit, possibly of a personal ANR device and possibly within an ADC of the ANR circuit, feedback reference data, feedforward reference data and/or pass-through audio data is provided to a secondary downsampling (and/or decimating) filter and/or is provided to a calculating block (e.g., RMS or absolute calculation block) to derive side-chain data to be output by the ANR circuit to a processing device coupled to the ANR circuit to employ the side-chain data in an analysis related to the provision of feedback-based ANR, feedforward-based ANR and/or pass-through audio by the ANR circuit.

Abstract: In an ANR circuit, possibly of a personal ANR device, each of a feedback ANR pathway in which feedback anti-noise sounds are generated from feedback reference sounds, a feedforward ANR pathway in which feedforward anti-noise sounds are generated from feedforward reference sounds, and a pass-through audio pathway in which modified pass-through audio sounds are generated from received pass-through audio sounds incorporate at least a block of filters to perform those functions; and may each incorporate one or more VGAs and/or summing nodes. For each of these pathways, ANR settings for selections of quantities and types of filters for each filter block, bit sizes of coefficients and/or coefficient values of each of the filters, along with still other ANR settings, are dynamically configurable wherein dynamic configuration is performed in synchronization with the transfer of one or more pieces of digital data along one or more of the pathways, at least within one or more of the filter blocks.

Abstract: In an ANR circuit, possibly of a personal ANR device, each of a feedback ANR pathway in which feedback anti-noise sounds are generated from feedback reference sounds, a feedforward ANR pathway in which feedforward anti-noise sounds are generated from feedforward reference sounds, and a pass-through audio pathway in which modified pass-through audio sounds are generated from received pass-through audio sounds incorporate at least a block of filters to perform those functions; and may each incorporate one or more VGAs and/or summing nodes. For each of these pathways, ANR settings for interconnections of each of the pathways, coefficients of each of the filters, gain settings of any VGA, along with still other ANR settings, are dynamically configurable wherein dynamic configuration is performed in synchronization with the transfer of one or more pieces of digital data along one or more of the pathways.