I'm implementing a resampling (decimation) filter on a fixed-point platform (c54x) as a cascade of second-order-section IIR filters. Unfortunately my implementation is very sensitive to overflow, unless I down-scale my input signal quite a lot (and thereby loose a great deal of signal-to-noise ratio). My question is as follows: Is there a specific second-order-section implementation (Direct Form I, Direct Form II, Transposed DFII, Lattice, etc.) which is less sensitive to overflow than my current DFII implementation? Any suggestions will be welcomed, as well as links to informations sources on the topic! Regards, Carsten --- Carsten Borg, M.Sc.EE. Embedded Systems - Digital Signal Processing Oticon A/S Strandvejen 58 DK-2900 Hellerup Denmark mailto:cbo@cbo@... Tel: +45 39 17 71 00 Direct: +45 39 17 73 05 Fax: +45 39 27 79 00 http://www.oticon.com ---
Overflow in IIR filters
Started by ●January 3, 2001