Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Adjacent ear
Reexamination Certificate
2009-04-28
2011-12-06
Enad, Elvin G (Department: 2832)
Electrical audio signal processing systems and devices
Acoustical noise or sound cancellation
Adjacent ear
Reexamination Certificate
active
08073151
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.
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Carreras Ricardo F.
Joho Marcel
Bose Corporation
Enad Elvin G
Horn Robert W
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