Signal Processor for Loudspeaker Systems for Enhanced Perception of Lower Frequency Output

A signal processing system including a loudspeaker system for controlling a lower frequency acoustic range acoustic output of at least one loudspeaker, comprising;

• an input to receive at least one audio signal channel corresponding to an acoustic output of the at least one loudspeaker including at least one electro-acoustic transducer with a vibratile diaphragm, wherein,
• at least a portion of at least one band of frequencies in the lower frequency acoustic range of the acoustic output of the loudspeaker has an amplitude reduced below a reference level response,
• at least a portion of the reduced amplitude is due to at least one of a gain reduction of a gain filter, an acoustic amplitude response of the at least one loudspeaker, and an acoustic environment external to the loudspeaker, and
• the signal processing system provides a perceived amplitude correction for the reduced amplitude, the signal processing system further comprising,
• at least one transpositional gain controller processor for transposition of at least a portion of the reduced amplitude of at least one band of frequencies, to an increased gain in at least one transpositional target frequency in at least one audio signal channel in the lower frequency audio signal range, wherein the transpositional gain controller processor includes at least one of at least one static transpositional gain controller and at least one dynamic transpositional gain controller,
• at least one additional signal processor, in addition to the transpositional gain controller processor,
• the at least one additional signal processor, including at least one of at least one phase change, at least one time delay, at least one dynamic gain filter, at least one harmonics generator and at least one dynamic harmonics generator, wherein
• the harmonics generator and the dynamic harmonics generator generate harmonics of at least a portion of the at least one band of frequencies and the generated harmonics of the at least one harmonics generator are in at least one of the audio signal channels,
• each dynamic processor is responsive to a threshold detector with at least one amplitude threshold, and the at least one additional signal processor operates in at least one audio channel signal.

A method of providing a signal processing system for controlling at least one channel of a lower frequency acoustic range of an acoustic output capability of at least one loudspeaker system incorporating at least one transducer with a vibratile diaphragm to create a perception of an increased lower frequency acoustic capability, including the steps of;

• configuring an input of the signal processing system to receive at least a first channel audio signal corresponding to an acoustic output of the at least one loudspeaker,
• incorporating at least one transpositional gain controller processor,
• configuring the at least one transpositional gain controller processor to operate as at least one of at least one static transpositional gain controller and at least one dynamic transpositional gain controller,
• identify at least one band of frequencies in the lower frequency acoustic range with a depressed amplitude, below a reference target curve, in the lower frequency acoustic range, wherein,
• at least a portion of the depressed amplitude is due to at least one of a gain reduction of a gain filter, an acoustic amplitude response of the at least one loudspeaker, and an acoustic environment external to the loudspeaker,
• selecting at least one transpositional target frequency in a lower frequency audio signal range,
• configuring the at least one transpositional gain controller processor for transposition of at least a portion of a gain corresponding to the depressed amplitude of the at least one band of frequencies, to the at least one transpositional target frequency.