SUMMARYĪ first set of signals from an array of one or more microphones, and a second signal from a reference microphone are used to calibrate a set of filter parameters such that the filter parameters minimize a difference between the second signal and a beamformer output signal that is based on the first set of signals. This has meant a tradeoff between audio performance and useability features such as comfort, portability and cachet. Inherent to this size constraint is the requirement that the microphone be placed farther from the user's mouth, generally increasing its susceptibility to environmental noise. Concerns for comfort, portability, and cachet have led to the desire for headsets with a small form factor. The need for hands-free communication has led to an increased popularity in the use of headsets with mobile phones and other speech interface devices.
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