Peak detection when adapting a signal gain based on signal loudness

US9219455B2 · kind B2 · utility

Assignee

• HARMAN BECKER AUTOMOTIVE SYSTEMS GMBH · DE

Inventors

• Wolfgang Hess · Waldbronn, DE
• Frank Baehren · Pforzheim, DE

Key dates

• Filing date: Feb 1, 2013
• Grant date: Dec 22, 2015
• Expiry date: Feb 9, 2034

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03G9/025
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

Abstract

Various embodiments relate to a system for adapting a signal gain, which comprises a peak detector configured to receive an audio input signal containing consecutive signal blocks and to dynamically establish a current input signal level of the audio input signal, and a loudness determination unit configured to dynamically determine a perceived loudness of a current signal block of the audio input signal based on a psycho-acoustic model of a human hearing. Furthermore the system comprises a time constant generation unit configured to determine a time constant based on the perceived loudness of the current signal block and the perceived loudness of a preceding signal block, wherein the time constant describing a change of the signal gain. A gain determination unit is configured to determine the signal gain for the current signal block based on the time constant and the current input signal level.