Malcolm H Chellquist

US Patent:

47395141, Apr 19, 1988

Filed:

Dec 22, 1986

Appl. No.:

6/945282

Inventors:

William R. Short - Wellesley MA
Malcolm Chellquist - Holliston MA

Assignee:

Bose Corporation - Framingham MA

International Classification:

H03G 500

US Classification:

381103

Abstract:

An automatic dynamic equalizer includes left and right input terminals, an input adder and left and right output adders. The left and right input terminals are connected to inputs of the input adder and inputs of the left and right output adder, respectively. The output of the input adder is connected to the input of a 2:1 compressor. The output of the 2:1 compressor is connected to the input of a bandpass filter having a transmission in the low bass frequency region centered at a frequency of about 60 Hz. The output of the bandpass filter is coupled to inputs of the left and right output adders.