Patent ID: 9014384
Filing Date: 2015-04-21
Classification: H03F,H04R

Abstract:
1. A sound system for producing sound, the sound system comprising a processing unit for processing an input sound signal to produce a loudspeaker signal, a loudspeaker for generating sound in dependency on the loudspeaker signal, the loudspeaker comprising a voice coil for driving the loudspeaker, a temperature of the voice coil depending on the loudspeaker signal, and a monitor for monitoring an electric response of the voice coil to the loudspeaker signal, the processing unit being configured for adapting the loudspeaker signal to control the temperature of the voice coil in dependency on the monitored response, wherein the processing unit comprises a signal generator for generating an evaluation signal, and processing the input sound signal to produce a loudspeaker signal involves combining the evaluation signal with the input sound signal, wherein the evaluation signal comprises a signal having an evaluation frequency that is below the resonant frequency of the loudspeaker, wherein the processing unit is configured for adapting the loudspeaker signal to control the temperature of the voice coil by attenuating the loudspeaker signal in a first frequency band without attenuating the loudspeaker signal in a second frequency band that has a higher frequency than the first frequency band and filtering the input sound signal with a low-pass filter.