Unified post-filter for an audio filter system for vehicle

An audio filter system for a vehicle, the audio filter system comprising:

• data processing hardware;
• and
• memory hardware in communication with the data processing hardware, the memory hardware storing instructions that when executed on the data processing hardware cause the data processing hardware to perform operations comprising:
• 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;
• determining, based on the speech-presence probability, a noise smoothing factor;
• 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;
• generating, via the unified post-filter, a directionality-based mask and a coherence-based mask;
• 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.

An audio filter system for a vehicle, the audio filter system comprising:

• data processing hardware;
• and
• memory hardware in communication with the data processing hardware, the memory hardware storing instructions that when executed on the data processing hardware cause the data processing hardware to perform operations comprising:
• 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;
• determining, based on the speech-presence probability, a noise smoothing factor;
• 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;
• generating, via the unified post-filter, a directionality-based mask and a coherence-based mask;
• generating, based on the directionality-based mask and the coherence-based mask, a residual echo spectrum estimation;
• setting one or more spectral shaping factors based on the residual echo spectrum estimation;
• and
• implementing, via the unified post-filter, a parametric variant of a Wiener filter.