Patent ID: 7783449

Claim:
A digital high-pass filter comprising: an input; an output; a subtractor stage, having a first input terminal and a second input terminal and an output terminal, said first input terminal being connected to said input of said digital high-pass filter and said output terminal being connected to said output of said digital high-pass filter; and a recursive circuit branch connected between said output of said digital high-pass filter and said second input terminal of said subtractor stage, wherein said recursive circuit branch comprises an accumulation stage and a divider stage cascaded to one another, wherein said accumulation stage comprises an integrator circuit having a recursive accumulation structure having an own input terminal, an own output terminal, an adder block connected to said own input terminal, and a delay block connected to said adder block and to said own output terminal; and said adder block has a first positive input, a second positive input, and an output, said first positive input of said adder block being connected to said input terminal of said integrator stage, said output of said adder block being connected to said output terminal of said integrator stage; and said delay block having an input connected to said output terminal of said integrator stage and an output connected to said second positive input of said adder block.