Patent ID: 7447318
Filing Date: 2008-11-04
Classification: G01K,H04R

Abstract:
1. A method for compensating for temperature dependent performance degradation in a loudspeaker, comprising: predicting an input power being delivered to a voice coil based on an input signal representative of voltage being fed to a plurality of loudspeaker where the voice coil is one of a plurality of voice coils that are each associated with a loudspeaker in the plurality of loudspeakers; processing the input signal to each loudspeaker through a separate thermal-processing engine coupled to each voice coil, estimating a temperature for each voice coil based on a thermal-model included in each thermal-processing engine, wherein the thermal-model is changed dynamically by application of a coefficient to the thermal-model in response to a cooling effect value sampled at predetermined times to estimate the cooling effects of the voice coil movement; calculating a coil resistance, and a gain compensation based on the temperature; and modifying the input signal to the plurality of voice coils with equalization parameters that are set in response to the thermal-model, whereby the gain is reduced to zero if the temperature reaches a predetermined limit and restored to unity if the temperature is under the predetermined limit.