Implementation Aspects of Second-order LDI/LDD Allpass Filters
نویسندگان
چکیده
The computational properties of second-order lossless discrete integrator/differentiator (LDI/LDD) allpass filters are studied, where the resource requirements in bit-serial hardware implementations are given particular interest. The properties of the LDI/LDD filters are compared to the corresponding properties of second-order wave digital (WD) filters using three-port series adaptors. Two implementation cases are considered. First, the filter structures are scheduled over a single sample period, and, second, they are scheduled to be maximally fast. The filter structures have an equal theoretical upper bound on the throughput. The analysis shows that the second-order LDI/LDD allpass filter can be implemented with fewer D flip-flops and adders than the second-order WD allpass filter. We conclude that about 15% and 20% more D flip-flops and adders are needed, respectively, in an implementation of the second-order WD allpass filter compared to the second-order LDI/LDD allpass filter.
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