Patent ID: 7031474

Claim:
An audio correction system for enhancing spatial and frequency response characteristics of sound reproduced by two or more loudspeakers, said audio correction system comprising: an image correction module configured to correct a perceived vertical image of sound when said sound is reproduced by a plurality of loudspeakers, said image correction module altering said sound as a first function of frequency over a first frequency range and altering said sound as a second function over a second frequency range, wherein said first function of frequency is independent of said second function of frequency; a bass enhancement module configured to enhance a bass response of said sound when said sound is reproduced by said plurality of loudspeakers, said bass enhancement module modulates the amplitude of a higher-frequency signal with a lower-frequency signal to produce a signal envelope where said higher-frequency signal is modulated by said lower-frequency signal, wherein said base enhancement module comprises: a first band pass filter that filters said sound at a first frequency; at least a second band filter that filters said sound at a second frequency, wherein said second frequency is different than said first frequency; a third band pass filter that filters said sound at a third frequency, wherein said third frequency is different than said first and second frequencies; a combiner that combines the output of said first, second and third band-pass filters to generate a combined filtered signal; a compressor that reduces the gain of the at least a portion of the high amplitudes in the combined filtered signal; and a base punch circuit that increases the gain of at least a portion of the low amplitudes in the combined filtered signal; and an image enhancement module configured to spectrally shape difference information associated with said sound to enhance a horizontal image of sound when said sound is reproduced by said plurality of loudspeakers.