@article{oai:nagoya.repo.nii.ac.jp:00031629,
 author = {Ochiai, Yoshiyuki and Fukumura, Teruo},
 issue = {2},
 journal = {Memoirs of the Faculty of Engineering, Nagoya University},
 month = {Feb},
 note = {This is some study of trial concerning what is called transmission quality, that is, quality study of speech sound by distortion. As distortion, only one is selected; of very singular nature so as to give an unexampled effect as well to its timbres as to its pitches. As speech sounds, we selected also only one; Japanese speech phones of open-syllable type based upon its classical syllabary． Confining thus the type of distortions and the kind of languages respectively to only one, we have contrived, in return, to widen a field of vision on quality and refine at the same time our observation on it. Not having given up, therefore, the articulation study as traditional one, a field of mishearing phenomena was developed further as a sort of measure concerning the informations on subjective timbre. We have moreover provided the means by which we could enter far into the study of another kind of timbre treatment basing upon the aspect of naturalness. It comes in contact with the tolerance problem of distortion. In addition to these, we have made a new departure by carrying a pitch- and loudness-experiment of speech sounds, and covering thus a wider range of quality subjects. As to the distortion of this kind, the consideration and measurement on pitch-attribute are indispensable. We have ascertained it with an actual example of distorted pitches a part of which is determinable only by subjective comparison method. We were also enabled to deepen the idea of “pitchedness" by examining in full the vowels in phonated and whispered utterance, the voiced- and unvoiced-consonants as well in phonated as in whispered condition. In the treatment of mishearing, we have made some trial of sound classification which would enable us to contribute something to a sort of psychological specification of speech sounds. In short, this specific distortion can remind us of the very rôle of voice element in speech quality, that is, the timbre problem viewed from the side of naturalness, the pitch problem of speaking voices, the sonority problem of consonant phones; these were all neglected perfectly as yet without making themselves fall under our notice.},
 pages = {147--182},
 title = {Studies on qualities of speech and voice by timbre distortion},
 volume = {4},
 year = {1953}
}