PD音源の特許これっぽい？＞＜特開昭59-111515https://www.j-platpat.inpit.go.jp/c1800/PU/JP-S59-111515/7681628671545285833BFAAA32FFB012B7D9A3529BA621DDAC33E1F4729D8AE9/11/ja
思考の /dev/null
