Patent ID: 6845165
Filing Date: 2005-01-18
Classification: G10H

Abstract:
1. An acoustic effect apparatus for boosting an output signal of a bass musical instrument comprising an input for receiving the output signal of the bass musical instrument; bandpass filter means coupled to the input for selecting a frequency band of an audio output signal; distortion applying means coupled to the bandpass filter means for applying a non-linear distortion to the selected frequency band signal; adding means coupled to the input and the distorting applying means for deriving a sum of the input audio signal and the output signal from the distortion applying means; wherein said bandpass filter means has a low frequency cut-off frequency which is in a range of 50 to 300 Hz, and a high frequency cut-off frequency which is in a range of 200 to 450 Hz and passes only a double-numbered overtone component of the desired fundamental tone of the bass musical instrument and suppresses the signal frequencies lower than or equal to the fundamental tone as well as the signal frequencies above the double-numbered overtone thereby selecting components corresponding to the double-numbered overtone component; said distortion applying mew having an S-shaped non-linear input-output response defined by a curve which has no point symmetry with respect to a reference point of an input and an output function and applies non-linear distortion to the components thus passed by the band-pass filter means to thereby generate harmonics of double-numbered overtone frequencies, thereby boosting the even-numbered overtone of the fundamental tone of the bass musical instrument.