Patent ID: 8223993
Filing Date: 2012-07-17
Classification: H03G

Abstract:
1. An audio reproduction system comprising: an electronic device that reproduces prerecorded content, a signal conditioner that magnifies low frequency transients in the reproduced content, and a subwoofer having a speaker, the speaker reproducing the content, the signal conditioner including: an input for a signal from the electronic device; a band pass filter which passes a lower frequency spectrum of the input signal, the band pass filter including a high pass filter having a first predetermined attenuation curve with a first attenuated portion and a low pass filter having a second attenuation curve with a second attenuated portion, the first and second attenuated portions overlapping; the band pass filter producing a filtered input to a peak voltage follower circuit; the peak voltage follower circuit tracing and smoothing the upper boundary of the filtered input to produce a control voltage; and an analog multiplier that multiplies the input signal by the control voltage produced by the peak voltage follower circuit, the output of the multiplier representing an enhanced signal where the low frequency transients have been magnified.