Audio system phase equalization

US9930468B2 · kind B2 · utility

Assignee

• Apple Inc. · US

Inventors

• Markus Christoph · Straubing, DE
• Leander Scholz · Salching, DE

Key dates

• Filing date: May 22, 2015
• Grant date: Mar 27, 2018
• Expiry date: May 22, 2035

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04R2499/13
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

A method is provided for optimizing acoustic localization at one or more listening positions in a listening environment such as, but not limited to, a vehicle passenger compartment. The method includes generating a sound field with a group of loudspeakers assigned to at least one of the listening positions, the group of loudspeakers including first and second loudspeakers, where each loudspeaker is connected to a respective audio channel; calculating filter coefficients for a phase equalization filter; configuring a phase response for the phase equalization filter such that binaural phase difference (Δφmn) at the at least one of the listening positions or a mean binaural phase difference (mΔφmn) averaged over the listening positions is reduced in a predefined frequency range; and filtering the audio channel connected to the second loudspeaker with the phase equalization filter.