-- Butterworth BRF
-- Sampling Frequency =   44100.0
-- cutoff1 =    2000.0
-- cutoff2 =    5000.0
-- Order = 3rd
-- Quantized by 15 [bits]
-- **** 1st biquad ****
    a0_A <= "0011111111111111" when sw0 = '0' else "0011010001110010";
    a1_A <= "0000000000000000" when sw0 = '0' else "1010000110111101";
    a2_A <= "0000000000000000" when sw0 = '0' else "0011010001110010";
    b1_A <= "0000000000000000" when sw0 = '0' else "0101011100011011";
    b2_A <= "0000000000000000" when sw0 = '0' else "1100111111110100";
-- **** 2nd biquad ****
    a0_B <= "0011111111111111" when sw0 = '0' else "0011110111001010";
    a1_B <= "0000000000000000" when sw0 = '0' else "1001000011110001";
    a2_B <= "0000000000000000" when sw0 = '0' else "0011110111001010";
    b1_B <= "0000000000000000" when sw0 = '0' else "0111001010100111";
    b2_B <= "0000000000000000" when sw0 = '0' else "1100100000000011";
-- **** 3rd biquad ****
    a0_C <= "0011111111111111" when sw0 = '0' else "0011010010011000";
    a1_C <= "0000000000000000" when sw0 = '0' else "1010000101111001";
    a2_C <= "0000000000000000" when sw0 = '0' else "0011010010011000";
    b1_C <= "0000000000000000" when sw0 = '0' else "0101111010000111";
    b2_C <= "0000000000000000" when sw0 = '0' else "1101011011010000";