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Since the phase approximation problem is inherently nonlinear, some iterative approaches have been proposed. Its disadvantage is in the increase of the amount of computation.</jats:p><jats:p>Another method to transform group delay approximation problem to power spectrum approximation problem is presented. This indirect approach leads to the minimum squared error problem which is easily solved but does not yield a satisfactory result.</jats:p><jats:p>In the first part of this paper, the 1‐D group delay approximation problem is formulated to a linear problem in group delay domain. Then we apply the quasi‐least mean squared method to it. In the latter part of this paper, the 1‐D method is extended to the 2‐D group delay approximation problem. Some examples are shown to verify the effectiveness of the method.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1583950557781819264","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000415152008"}],"foaf:name":[{"@value":"Kazuhiro Ino"}]},{"@id":"https://cir.nii.ac.jp/crid/1583950557781819266","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000415152009"}],"foaf:name":[{"@value":"Masayoshi Sakai"}]},{"@id":"https://cir.nii.ac.jp/crid/1583950557781819265","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000415152010"}],"foaf:name":[{"@value":"Nozomu Hamada"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"10420967"},{"@type":"EISSN","@value":"15206440"}],"prism:publicationName":[{"@value":"Electronics and Communications in Japan (Part III: Fundamental Electronic Science)"}],"dc:publisher":[{"@value":"Wiley"}],"prism:publicationDate":"1993-01","prism:volume":"76","prism:number":"5","prism:startingPage":"39","prism:endingPage":"49"},"reviewed":"false","dc:rights":["http://onlinelibrary.wiley.com/termsAndConditions#vor"],"url":[{"@id":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fecjc.4430760504"},{"@id":"https://onlinelibrary.wiley.com/doi/pdf/10.1002/ecjc.4430760504"}],"createdAt":"2007-07-11","modifiedAt":"2023-10-26","foaf:topic":[{"@id":"https://cir.nii.ac.jp/all?q=Electrical%20and%20Electronic%20Engineering","dc:title":"Electrical and Electronic Engineering"}],"relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360845538934688768","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"A new approach to the realization of low-sensitivity IIR digital 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