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On Group-Delay Sensitivity Properties of Complex Allpass Lattice Filters
Saed SAMADI Akinori NISHIHARA Nobuo FUJII
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1991/11/25
Print ISSN: 0916-8508
Type of Manuscript: Special Section PAPER (Special Issue on HAKONE Digital Signal Processing Symposium)
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The group-delay sensitivity is studied theoretically for Gray and Markel allpass lattice filter realizing complex transfer function. Recursive expressions which were derived for phase and group-delay in real lattice are rederived for the complex case. These expressions are used to obtain upper bounds on group-delay sensitivity. The minimum number of frequencies where group-delay sensitivity becomes zero is discussed. Results corresponding real allpass lattice are also shown. Phase sensitivity properties of these filters are analyzed and compared with existing results. A new bound on phase sensitivity is also obtained.