I'm trying to design a FIR filter(direct form) the coefficient of which will be used to design a polyphase resampler that does Zero-Order Hold resampling. If the direct form impulse response is triangular, then we get a linear interpolator.
Is it possible to imagine a filter response that would produce a ZOH interpolator? I have some constraints that prevent a simple MATLAB's
repelem() based ZOH implementation.