Continuous-time envelope-constrained filter design via DSP approach

In envelope-constrained (EC) filter design, the effect of input noise is minimised subject to the constraint that the filter´s response to a specified signal fits into a prescribed envelope. The continuous-time version of this problem has been addressed using orthonormal analogue filters. The paper addresses the EC filter-design problem using a filter comprised of an A/D converter, a digital processor, a D/A converter and an analogue interpolation filter. Numerical results are presented for a number of design examples