Loudspeaker overload protection

US9729951B2 · kind B2 · utility

Assignee

• HARMAN BECKER AUTOMOTIVE SYSTEMS GMBH · DE

Inventors

• Florian Wolf · Ilmenau, DE
• Peter Perzlmaier · Regensburg, DE
• Leander Scholz · Salching, DE
• Markus Christoph · Straubing, DE
• Georg Spielbauer · Bogen, DE

Key dates

• Filing date: Feb 22, 2013
• Grant date: Aug 8, 2017
• Expiry date: Apr 18, 2034

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04R3/007
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

A loudspeaker overload protection circuit and method receives at a compressor a signal representing the estimated loudspeaker power consumption; receives at the compressor a signal representing the nominal power of the loudspeaker; receives at the compressor an input audio signal from the signal source and supplying with the compressor an output audio signal to the loudspeaker; estimates from the output audio signal, (a) signal(s) that represent(s) the voltage and/or current supplied to the loudspeaker and a parameter that represents the ohmic resistance of the loudspeaker the power consumed by the loudspeaker; supplies a signal representing the estimated loudspeaker power consumption to the compressor; and attenuates the input audio signal when the signal representing the estimated loudspeaker power consumption exceeds the signal representing the nominal power of the loudspeaker.