Unified post-filter for an audio filter system for vehicle

Abstract

A computer-implemented method when executed by data processing hardware causes the data processing hardware to perform operations. The operations include receiving, from a sensor array, an audio signal at a unified post-filter, converting, via a conversion function, the audio signal into a Short-Time Fourier Transform (STFT) domain, determining, based on the converted audio signal, a speech-presence probability, and determining, based on the speech-presence probability, a noise smoothing factor. The operations also include estimating, via the unified post-filter, a noise power spectral density based on the noise smoothing factor, estimating, via the unified post-filter, a steering vector of a desired source, and generating, via the unified post-filter, a directionality-based mask and a coherence-based mask. The operations further include generating, based on the directionality-based mask and the coherence-based mask, a residual echo spectrum estimation and setting one or more spectral shaping factors based on the residual echo spectrum estimation.