Covariation of subglottal press
نویسنده
چکیده
This is a report summarising results from studies of true subglottal pressure, supraglottal pressure and speech wave data. We have derived co-variation patterns, which allow a prediction of intensity from subglottal pressure and F0, and conversely a prediction of a subglottal pressure contour from F0 and intensity. Of special interest is the significance of a mid-point in a speakers’ available F0 range at which the relations change. In the lower F0 range subglottal pressure and intensity rise with F0, whilst in the upper part they tend to saturate. In connected speech we find a build-up of subglottal pressure well in advance of a stressed word, and a decay of subglottal pressure in the final part of a phrase starting already in the falling branch of an F0 peak. 1. Documentary material Our study is concerned with the co-variation of subglottal pressure, F0 and intensity within a prosodic frame. A substantial part of our material includes a unique set of synchronized recordings of true subglottal pressure obtained from a sond inserted externally into the larynx, together with supraglottal pressure and the speech wave. A male laryngologist served as a subject [1-3]. A most important tool has been the speech processing and display system Wspect, developed by Johan Liljencrants. Besides oscillogram and spectrogram it generates F0 on a log scale, with a standard of one semitone per 2 mm. Two intensity traces are provided, the regular SPL and one with high frequency pre-emphasis, SPLH [1-2, 5-7] defined by a
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