@article{oai:soar-ir.repo.nii.ac.jp:00012948,
 author = {柳沢,  武三郎 and 降旗,  建治},
 journal = {信州大学工学部紀要},
 month = {Dec},
 note = {In place of the usual frequency conversion, the principle of a new analysis, which does not use the lumped constant type filter but can analize the wave forms even in the range of frequency below the audio frequency, is discussed and then the measuring system is described. It was experimentally possible to analize the distortion wave of the fundamental frequency of 10 Hz that was the lowest frequency measured in this system. The measurable frequency is capable of being lowered by the improvement of PLL in this system., Article, 信州大学工学部紀要 35: 47-56 (1973)},
 pages = {47--56},
 title = {相互相関によるアナログ周波数分析法},
 volume = {35},
 year = {1973}
}