I personally would recommend this online book ( http://www.dspguide.com/pdfbook.htm ) by Steven W. Smith. It covers the basic math and also provides algorithms for several kinds of filters (e.g window sync etc). You will find time domain as well as frequency domain algorithms there.

Implementing a simple FIR (finite impulse response) window sync filter using the code provided in this book is trivial. It also does a good job explaining the parameters needed for filter design (rollof, stopband attenuation, passband ripple etc)

I personally would recommend this online book ( http://www.dspguide.com/pdfbook.htm ) by Steven W. Smith. It covers the basic math and also provides algorithms for several kinds of filters (e.g window sync etc). You will find time domain as well as frequency domain algorithms there.

Implementing a simple FIR (finite impulse response) window sync filter using the code provided in this book is trivial. It also does a good job explaining the parameters needed for filter design (transition band rolloff, stopband attenuation, passband ripple etc)