公开(公告)号：US11329622B2

公开(公告)日：2022-05-10

申请号：US16854541

申请日：2020-04-21

Applicant: MITEK CORP., INC.

Inventor： Brandon Graham ,  Johnathan Ivey

IPC: H03G3/20 ,  H03G3/00 ,  H03G3/32 ,  H03G3/04

Abstract: An element of an automatic gain control system that automatically calibrates a Composite Gain vs Ambient Noise look-up table responsive to user zone gain inputs at various ambient noise levels. The table is a graph of adjacent (horizontally or diagonally) data points (nodes) mapping ambient noise to composite gain. Three algorithmic rules determine position changes of the nodes responsive to zone gain inputs. A curve may be fit to an arrangement of adjacent nodes. The curve, or the interpolated table value, is used with an ambient noise input to determine the current composite gain. The element may be used with many traditional ANC systems. Once calibrated over the full range of ambient noises in the user's space, the ANC system may never need further user zone gain inputs.

公开(公告)号：US11095981B2

公开(公告)日：2021-08-17

申请号：US16852041

申请日：2020-04-17

Applicant: MITEK CORP., INC.

Inventor： Brandon Graham ,  Johnathan Ivey

IPC: H04R3/04 ,  G10L21/0216 ,  G06F17/17

Abstract: An apparatus instantiating a method for computing automatic noise compensation gain with an adaptive filter that receives ambient sound and source audio, down samples ambient sound and source audio, and filters the down sampled ambient sound and source audio to compute an RMS noise estimate from which a gain is determined. The present invention features highly efficient computations, as sampling rates are significantly lower. The present invention keeps audio data secure by transmitting only the mean-square audio levels instead of the audio itself.