BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Regarding calculation of coefficients of Polyphase IIR filte          BorlandTalk.com Forum Index -> Delphi VCL Components Writing View previous topic :: View next topic   Author Message Aparna Ram Guest Posted: Tue Apr 10, 2007 2:57 pm    Post subject: Regarding calculation of coefficients of Polyphase IIR filte Dear All, I am working on the Polyphase IIR filter for subbanding in Acoustic Echo Cancellation. For subbanding I am using Polyphase IIR filter. To calculate the coefficents of Polyphase IIR filter, I am not getting any sufficient information (for calculation of coefficients of Polyphase IIR filter) from any documents. I found some existed Polyphase IIR filter coefficient values but I want to know that how to calculate the filter coefficients of Polyphase IIR filter. In some documents I found that bit-flipping algorithm is used for the designing(calculatin of coefficients) of Decimated Polyphase IIR filter. But when I went through the bit-flipping algorithm I understood that it is used to optimise the calculated(or existed) coefficients constrained to the coefficient bit length. So first I have to calculate the coefficients of filter by some method and then I have to optimise that. But to calculate that coefficient values I am finding the related documents. If any one knows the links and information regarding this please reply to this mail. Waiting for your valuable suggestions and replies. Thanks in advance. Regards, Aparna Ram.K. 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