Group-delay based bass management

US9191766B2 · kind B2 · utility

Assignee

• HARMAN BECKER AUTOMOTIVE SYSTEMS GMBH · DE

Inventors

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

Key dates

• Filing date: Dec 21, 2010
• Grant date: Nov 17, 2015
• Expiry date: Sep 3, 2033

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04S7/307
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

The listening room comprises at least one loudspeaker and at least one listening position. The method comprises providing for each loudspeaker, a group delay response to be equalized associated with one pre-defined position within the listening room; calculating filter coefficients for all-pass filter(s) each arranged upstream to one corresponding loudspeaker, the all-pass filter(s) having a transfer characteristic such that the corresponding group delay response(s) match(es) a predefined target group delay response. The filter coefficients have a group delay response being confined by a frequency dependent group delay constraint that defines a frequency dependent interval exponentially decaying with increasing frequency.