Wired and wireless microphone arrays

摘要

An acoustic noise canceling microphone arrangement and processor that uses a principal microphone and other microphones that may be incidentally or deliberately located in the vicinity of the principal microphone in order to derive an audio signal of enhanced signal-to-background noise ratio. In one implementation, the principal and incidental microphones comprise the microphone built into a mobile phone and the microphone built into a Bluetooth headset.

主权项

1. A system and apparatus for dynamically improving the ratio of a wanted speech signal from a principal speaker to random background noise that is not known or characterized a priori, comprising:
a principal microphone configured to be worn by said principal speaker and configured to produce a first audio signal containing a first sampling of the wanted speech plus unwanted background noise that has not previously been measured or characterized; at least one incidental microphone located remotely from said principal microphone by several acoustic wavelengths at a mid-band audio frequency and configured to produce a second audio signal containing a second sampling of at least said unwanted background noise that has not previously been measured or characterized; and a signal processor configured to dynamically jointly process said first and second audio signals, without reference to noise profiles or filters constructed in advance, by
receiving and processing said first audio signal to determine a first set of individual spectral components at a set of predetermined frequencies;receiving and processing at least said second audio signal to determine one or more additional sets of individual spectral components at said set of predetermined frequencies; anddynamically combining corresponding spectral components from said first set and one or more of said additional sets to obtain a combined set of spectral components in which unwanted background noise components are reduced compared to wanted speech components; andgenerating an output audio waveform solely from the combined set of spectral components, without filtering or suppressing noise by reference to a predetermined noise profile, in which the ratio of the wanted speech to unwanted noise is greater than the corresponding ratio for either the first or the second audio signal alone.