Sound-dependent ANR signal processing adjustment

摘要

ANR circuit to provide ANR comprising: a first ADC; a DAC; a first digital filter; a first pathway within the ANR circuit through which digital data representing sounds flows from the first ADC to the DAC through at least said filter at a first data transfer rate through at least part of the first pathway; first and second ANR settings buffers to be alternately employed in configuring first and second ANR settings in synchronization with a transfer of a piece of digital data transferred through at least part of the first pathway at the first data transfer rate; a mask to selectively enable the configuring of one or the other of the first and second ANR settings through alternately employing the first and second ANR settings buffers; and a third ANR settings buffer to store first and second failsafe ANR settings to configure the first and second ANR settings in response to an instance of instability being detected in the ANR circuit.