Method to maximize loudspeaker sound pressure level with a high peak to average power ratio audio source

摘要

A system is provided to protect a loudspeaker (144) by controlling a level of an applied audio signal. A control signal is generated by applying an input audio signal (115) to the collective operations of a gain control system (100). The gain control system (100) uses the input audio signal (115) in conjunction with at least one parameter to derive an estimated stress associated with the loudspeaker (144). The estimated stress is compared with a protection threshold stress (127). If the protection threshold stress is exceeded, a gain applied by a gain component (134) is selectively adjusted to modify the input audio signal (115). The resulting gain-controlled audio signal (116) is employed to drive the loudspeaker (144).

主权项

1. A loudspeaker system, comprising:
a loudspeaker including a loudspeaker coil; a temperature sensor positioned in close proximity to said loudspeaker and configured to generate a temperature signal which is based on both a temperature of the loudspeaker and on an ambient temperature of an environment in which said loudspeaker is disposed; a temperature component including a thermal modeling element arranged to determine an estimated relative temperature associated with the loudspeaker coil based on an input audio signal and a predetermined thermal response characteristic associated with the loudspeaker; a summer coupled to an output of the thermal modeling element and configured to sum an output from the thermal modeling element with a measured temperature value derived from said temperature signal to determine an absolute temperature of said loudspeaker coil; a control component arranged to provide a gain factor based on the absolute temperature; and a gain component arranged to provide a gain controlled audio signal for said loudspeaker by selectively controlling a gain applied to the input audio signal based on the gain factor.