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While exporting IIR filter coefficients into workspace, I get an option of SOS Matrix and Scale Values.What does "Scale values" option do?
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Rick Rosson
2011-7-6
0 个投票
The SOS Matrix is an M x 6 matrix that provides the unscaled coefficients for the M second-order sections that, when cascaded, implement the filter. The Scale values option outputs an M x 1 column vector G, each element of which is essentially a multiplicative gain factor that you can use simply to scale each second-order section so that the overall filter is referenced to 0 dB. So G does not affect the shape of the output waveform or spectrum, but it does affect the scale or level of the output or spectrum.
Does that make sense?
Rick
2 个评论
Sohaib Fakhar
2011-7-12
abhishek singh
2017-8-3
sir, i got SOS and G for my bandpass filter and now wants to apply it in C code to filter an audio . how can i do that.i still don't get idea how to apply these coefficients as i need to neglect frequencies that are 3db down
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