Determination of the coherence of audio signals

US8238575B2 · kind B2 · utility

Assignee

• Nuance Communications, Inc. · US

Inventors

• Markus Buck · Biberach, DE
• Timo Matheja · Ulm, DE

Key dates

• Filing date: Dec 11, 2009
• Grant date: Aug 7, 2012
• Expiry date: Aug 11, 2030

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L2021/02165
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

Embodiments of the invention disclose computer-implemented methods, systems, and computer program products for estimating signal coherence. First, a sound generated by a sound source is detected by a first microphone to obtain a first microphone signal and by a second microphone to obtain a second microphone signal. The first microphone signal is filtered by a first adaptive finite impulse response filter to obtain a first filtered signal. The second microphone signal is filtered by a second adaptive finite impulse response filter, to obtain a second filtered signal. The coherence of the first filtered signal and the second filtered signal is determined based upon the filtered signals. The first and the second microphone signals are filtered such that the difference between the acoustic transfer function for the transfer of the sound from the sound source to the first microphone and the transfer of the sound from the sound source to the second microphone is compensated in the first and second filtered signals.