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- Nilsonne, Åsa, et al.
(författare)
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Measuring the rate of change of voice fundamental frequency in fluent speech during mental depression
- 1988
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Ingår i: The Journal of the Acoustical Society of America. - : American Institute of Physics (AIP). - 0001-4966. ; 83:2, s. 716-728
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Tidskriftsartikel (refereegranskat)abstract
- A method of measuring the rate of change of fundamental frequency has been developed in an effort to find acoustic voice parameters that could be useful in psychiatric research. A minicomputer program was used to extract seven parameters from the fundamental frequency contour of tape‐recorded speech samples: (1) the average rate of change of the fundamental frequency and (2) its standard deviation, (3) the absolute rate of fundamental frequency change, (4) the total reading time, (5) the percent pause time of the total reading time, (6) the mean, and (7) the standard deviation of the fundamental frequency distribution. The method is demonstrated on (a) a material consisting of synthetic speech and (b) voice recordings of depressed patients who were examined during depression and after improvement.
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| 6. |
- Maguire Jr., Gerald Q.
(författare)
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Picture Archiving and Communications Systems : Progress and Current Problems
- 1988
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Ingår i: Medical Images: Formation, Handling and Evaluation - Proceedings of the NATO Advanced Study Institute on the Formation, Handling and Evaluation of Medical Images. - : Springer-Verlag Berlin and Heidelberg GmbH & Co. K. - 9783540561316
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 7. |
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| 8. |
- Noz, Marilyn E., et al.
(författare)
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Multimodality image display : Desirable frame buffer characteristics
- 1988
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Ingår i: Journal of medical systems. - : Springer Netherlands. - 0148-5598 .- 1573-689X. ; 12:4, s. 189-200
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Tidskriftsartikel (refereegranskat)abstract
- The intent of this paper is to understand the characteristics of those frame buffers currently used to display images, versus more ideal frame buffers for medical image display purposes. This study is based on current needs and what characteristics might be desirable. Two case examples are presented: (1) a system developed for high quality computer graphics and (2) a system developed for nuclear medicine and radiation therapy treatment planning. Our study considers: (1) defining a pixel depth sufficient to hold data, (2) the desirability of multiple color look-up tables, (3) how cine loops are managed, and (4) display memory size.
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| 9. |
- Noz, Marilyn E., et al.
(författare)
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QSH : a minimal but highly portable image display and handling toolkit
- 1988
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Ingår i: Computer Methods and Programs in Biomedicine. - : ELSEVIER SCI IRELAND LTD. - 0169-2607 .- 1872-7565. ; 27:3, s. 229-240
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Tidskriftsartikel (refereegranskat)abstract
- We describe a software system developed to handle images obtained from different sources, namely, computer-assisted tomography, positron emission tomography, single photon emission tomography and magnetic resonance imaging. In developing the system, it was necessary to address the following points. (1) The types of values that were encountered in both the header information and the pixel elements, namely, integers, floating point numbers, complex numbers and strings. (2) The use of domain-dependent sets of keys, that is, how to choose keys and how to stabilize the use of keys among the user population. This is, for example, how information such as the patient name, or the activity in becquerel is kept. It is necessary to keep both the key values and the units. (3) The development of a method for providing a database using flat files, i.e. linear text. (4) The maintenance of a history of values and operations. This is necessary in order to address the problem of determining from an image was produced. The connection between an image and how it was derived is analogous to describing how a secondary standard is derived from a primary one.
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| 10. |
- Sundberg, Johan, 1936-, et al.
(författare)
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Long-term average spectrum analysis of phonatory effects of noise and filtered auditory feedback
- 1988
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Ingår i: Journal of Phonetics. - : Elsevier. - 0095-4470 .- 1095-8576. ; 16:2, s. 203-219
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Tidskriftsartikel (refereegranskat)abstract
- Using long-term average spectrum (LTAS) analysis of fluent speech,the effects of speaking in noise and of speaking with differently filtered auditory feedback as well as of voluntarily changing vocal intensity is analyzed in nine male adult singers and non-singers. Three values in the LTAS are analyzed: the level of the main peak near 500 Hz, of a secondary peak near 2000 Hz and at the average F0. The level at 500 Hz was highly correlated with the equivalent sound level, with the average F0, and with the level of the peak near 2000 Hz. The singers were found to produce a higher sound level than the non-singers under all conditions, and their voices contained stronger high-frequency components. Also, unlike the non-singers they reduced vocal intensity when reading without added noise with enhanced high-frequency components in the auditory feedback. The LTAS effects of noise and of auditory feedback filtering was found to be similar to those of the changes of vocal intensity according to instruction for both singers and non-singers. When the high-frequency components of the auditory feedback was enhanced during reading in noise, both subject groups reduced vocal intensity.
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