Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Yukitsuna Furuya and Eiji Okamoto and Yoshihiko Akaiwa,Optimum pre-emphasis for FM transmission with frequency-domain voice scrambling,IEEE 39th Vehicular Technology Conference,,IEEE,2003-01-13,,,206-211,https://cir.nii.ac.jp/crid/1871709542511587712,https://doi.org/10.1109/vetec.1989.40075