An auto-focusing-noise suppressor for cellphone movies based on multiple noise references

This paper proposes an auto-focusing-noise suppressor for cellphonemovies based onmultiple noise references. Auto-focusing (AF) noise generated by lens actuators is suppressed with a spectral gain calculated from a combination of multiple noise references prepared in advance. For quick adjustment to individual differences among products,mixing ratios for noise references are adaptively determined by analysis results of the input signal. For simultaneous suppression of background noise, the spectral gain for AF noise or that for background noise, whichever is smaller, is applied to the input signal for actual suppression. Simulation results demonstrate that an AF noise generated by a commercial cellphone handset is successfully suppressed with little distortion in the target signal. Sound demonstration is provided upon presentation.