DIGITAL SIGNAL PROCESSOR FOR AUDIO EXTENSIONS AND CORRECTION OF NONLINEAR DISTORTIONS IN LOUDSPEAKERS

摘要

Digital filters for processing an input audio signal for extending the audio capabilities and reducing distortion of a loudspeaker. Such extension may include a general sound pressure level (SPL) extension or a more targeted low frequency (LF) extension. This may be accomplished by modifying an original frequency response of the loudspeaker to achieve a particular extension, and applying a digital linear filter based on the modified frequency response to the audio signal. A nonlinear digital filter may also be applied to the audio signal reduce nonlinear distortions of the loudspeaker. The nonlinear digital filter may be based on an inverse of an electro-mechanical model of the loudspeaker. In this manner, a loudspeaker may be driven close to its maximum theoretical power capability without increasing distortion in the loudspeaker output.

主权项

1. A method for processing an audio signal, comprising:
applying a linear filter to the audio signal, the linear filter based on a modified frequency response of a loudspeaker that is produced by modifying at least a portion of an original frequency response of the loudspeaker; and applying a nonlinear filter to the audio signal, the nonlinear filter based on an inverse of a model of the loudspeaker.