Fixed point IIR filters: introduction (0000)
Channel: Digital Signal Processing
Date: 05/12/2013

Fixed point IIR filters use just integer numbers for the input, output and coefficients. Coefficients are usually scaled up to the maximum possible precision by a power of 2. Because short int is the standard precision they are usually scaled up to 15 bits. For example if the maximum of the coefficients is 2 then the scaling factor would be 2^14 because of 15 - log2 2.