Sorry, if I have wasted anyone’s time. A little thought has solved my problem and answered my questions.
Thank you. Don Morgan > On Sep 22, 2018, at 09:46, dgm <d...@baykitty.com> wrote: > > > I am wondering whether it is feasible, or whether someone knows of a > reference for sliding FIR filters. > > Of course, these are filters whose cutoff frequency moves with the first > harmonic of the input signal. Probably, all of us have done this with IIR > filters but in this application I cannot afford the group delay of IIR > filters. > > The input can move as much as +/-500Hz each second, relatively smoothly, not > suddenly. I have a millisecond to calculate the coefficients for a 1024 tap > FIR filter, whose output can show no evidence of switching (jerks, steps, > etc). > > I would love to use equiripple calculations but I am open to others if they > are fast and clean enough. > > This application is for an ASIC, I cannot use standard libraries for it > except for reference, I expect that I will have to write it myself unless > someone knows of a reference or an application that I can use for reference. > > Please forgive my ignorance if the answers are obvious, I have not done this > before. > > Thank you for any help. > > Don Morgan > _______________________________________________ > dupswapdrop: music-dsp mailing list > music-dsp@music.columbia.edu > https://lists.columbia.edu/mailman/listinfo/music-dsp > _______________________________________________ dupswapdrop: music-dsp mailing list music-dsp@music.columbia.edu https://lists.columbia.edu/mailman/listinfo/music-dsp
