Patent ID: 6882222

Claim:
A low pass filter system for output in a D-class amplifier having at least two signal amplifying channels, wherein each of said signal amplifying channels includes an even number of inductors, said system comprising: a first low pass filter comprising: a first pair of inductors comprising inductors which are included in one of said signal amplifying channels and arranged so as to be adjacent to each other and connected; and a second low pass filter comprising: a second pair of inductors comprising inductors which are included in one signal amplifying channel arranged in parallel so as to be adjacent to said one of signal amplifying channels and which are arranged so as to be adjacent to each other and an electrical connection is made, wherein induced electromotive forces are caused in said second pair of inductors by a leakage magnetic flux from said first pair of inductors and are set off between the inductors included in said second pair of inductors, and wherein induced electromotive forces are caused in said first pair of inductors by a leakage magnetic flux from said second pair of inductors and are set off between the inductors included in said first pair of inductors.