Hi
I'm trying to calculate the coefficients to use in the TAS5508 GUI, I found the TI Biquad Coefficient Calculator but the the numbers do not seem to produce the same results in the GUI. I assume I'm missing something silly.
I want to produce a low pass filter >100Hz with a bit of a boost at 40Hz. When I plug the numbers in to the 5508 GUI, it shows no filtering and I get a gain increase after 10kHz.. I'd send pics but they will not paste in to this.
This is what I get out of the calculator.
Text "* Sample Rate = 48000"
Text "* Filter 1 Low Pass 1st Order Butterworth, 100 Hz Fc 0.0 dB "
Text "* Filter 2 EQ 43 Hz Fc 3.0 dB 10 Hz BW"
Text "* H(z) = (N0 + 2*N1/z + N2/(z2)) / (32768 - 2*D1/z - D2/(z2))"
Text "* Filter Coefficients in format N0, N1, N2, D1, D2"
Text "* Filter 1"
0x00D51314
0x006A898A
0x00000000
0x3F2AECEB
0x00000000
Text "* Filter 2"
0x7FFFFFFF
0x801EC8E7
0x7FC377B8
0x7FEA0C75
0x802ADD7D
