All of them will be shown step by step. New special-purpose hardware lets you do realtime frequency transformations with less hardware than with DSPs running FFTs.
Acrobat file describes the details.
A Look at Fractional Resampling ChipCenter author Eric Hagemann continues his discussion of DSP, focusing on polynomial-based techniques for fractional spaced interpolation needed when manipulating sampled waveforms where it's necessary to resample a waveform. Hagemann discusses why you might need to change the underlying sample rate or simply need to resample the signal at an alternate sample phase. Here's an application note by Jim Lepkowski of ON Semiconductor and Christopher Young, an engineering intern at Arizona State University. The app note discusses a design procedure for two-state variable oscillator circuits that can be used in precision capacitive sensor applications. Samples are mounted on a special test board with pin connectors to enable testing on a standard SOT-115 test fixture.