Adaptive phase difference based noise reduction for automatic speech recognition (ASR)

US9449594B2 · kind B2 · utility

Assignee

• Intel Corporation · US

Inventors

• Lukasz Kurylo · Gdańsk, PL
• Georg Stemmer · Munich, DE

Key dates

• Filing date: Sep 17, 2013
• Grant date: Sep 20, 2016
• Expiry date: Sep 17, 2033

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L2021/02166
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

Embodiments of a system and method for adapting a phase difference-based noise reduction system are generally described herein. In some embodiments, spatial information associated with a first and second audio signal are determined, wherein the first and second audio signals including a target audio inside a beam and noise from outside the beam. A signal-to-noise ratio (SNR) associated with the audio signals is estimated. A mapping of phase differences to gain factors is adapted for determination of attenuation factors for attenuating frequency bins associated with noise outside the beam. Spectral subtraction is performed to remove estimated noise from the single-channel signal based on a weighting that affects frequencies associated with a target signal less. Frequency dependent attenuation factors are applied to attenuate frequency bins outside the beam to produce a target signal having noise reduced.