Simulate quantization errors

[3ll3d00d]

minidsp hardware can have quantization errors at low frequencies

https://www.dsprelated.com/showarticle/1137.php describes a way to simulate this

nbits= 10;
a_quant= round(a*2^nbits)/2^nbits;           % quantize denom coeffs

[richardpl]

Even software implementation can have it with single-precision floats. That is why there are several different realizations: direct I, direct II, transposed direct I and II, state variable filters, lattice ladder, zero-delay feedback,.. to name a few.