In Reply to: RE: REVIEW: Schiit Audio Modi Multibit DAC Processors posted by erik_sq on October 11, 2016 at 15:09:13:
A closed-form filter has no bearing on whether or not the original samples are retained. 'Closed-form' means that the filter coefficients can be directly computed from a formula. The other approach is iterative - you use an algorithm to find the filter coefficients until the error is below some threshold. Both closed-form and iterative approaches are approximations to the ideal low pass filter, which is impossible to create in practice because the coefficient 'list' is infinitely long.As an example, half-band digital filters can be specified using iterative techniques (such as Parks-McClellan) and by definition pass all the original samples. These filters can be chained together to perform interpolation by powers of two.
See the link below for a good explanation from Rob Watts of Chord Electronics.
Edits: 10/25/16
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- RE: REVIEW: Schiit Audio Modi Multibit DAC Processors - yage 11:37:27 10/25/16 (0)