General consideration on studies of speech qualities in rotational synchronous distortion

This is a study concerning speech quality by the rotational or revolving synchronous distortion, a sort of specific transmissional distortion coming from a state of departure from synchronism between sound-recording and -reproducing systems of tape-recorder. As to the distortion of this kind, we can do away with the pitch- and loudness-study, turning our interest exclusively to the problem of timbre transmission. All observations and measurements were executed, so to say, from a timbre aspect of speech quality. In answering first to “clearness” requirement in speech communication, the articulation characteristics in a general and collective sense were primarily studied. For subjective study on timbre-quality mishearing phenomena between phonemes were treated with intense interest. We made further investigations on the allowance of this distortion aiming at timbre-discrimination in the case of the slightest departure from synchronism. Finally, we carried on some naturalness measurement in this distortion from which we can lead interesting and instructive results serviceable for transmission engineering.