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
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Carsten Borg, M.Sc.EE.

Embedded Systems -
Digital Signal Processing

Oticon A/S
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Denmark

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