Gerald A Studebaker

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Arcsine or angular transformations have been used for many years to transform proportions to make them more suitable for statistical analysis. A problem with such transformations is that the arcsines do not bear any obvious relationship to the original proportions. For this reason, results expressed in arcsine units are difficult to interpret. In this paper(More)
The effects of intensity on monosyllabic word recognition were studied in adults with normal hearing and mild-to-moderate sensorineural hearing loss. The stimuli were bandlimited NU#6 word lists presented in quiet and talker-spectrum-matched noise. Speech levels ranged from 64 to 99 dB SPL and S/N ratios from 28 to -4 dB. In quiet, the performance of(More)
Frequency-importance and transfer functions for the Technisonic Studios' recordings of the CID W-22 word test are reported. These functions may be used to calculate Articulation Index (AI) values or to predict scores on the W-22 test. The functions were derived from the word recognition scores of 8 normal-hearing listeners who were tested under 308(More)
A study was carried out to determine the relative importance to speech intelligibility of different intensities within the speech dynamic range. The functions that were derived are analogous to previous descriptions of the relative importance of different frequencies and are referred to here as intensity-importance functions (IIFs). They were obtained as(More)
OBJECTIVE A study was performed to derive a frequency importance function (FIF), a performance-intensity funcTIon (PIF), and a transfer function (TF) for the audio compact disc version of the Connected Speech Test (CST). DESIGN CST passages were masked with talker-spectrum-matched (TSM) noise and presented to two groups of normal-hearing adult subjects.(More)
The directional characteristics of a male and a female voice in the horizontal plane were measured in an anechoic room. Results were compared with the only two other studies known to have been done using human subjects. The results of the three studies agree very well. The directional characteristics of two loudspeakers were also measured. One loudspeaker,(More)
Normal hearing subjects estimated the intelligibility of continuous discourse (CD) passages spoken by three talkers (two male and one female) under 135 conditions of filtering and signal-to-noise ratio. The relationship between the intelligibility of CD and the articulation index (the transfer function) was different from any found in ANSI S3.5-1969. Also,(More)
Formulas that convert speech recognition scores, in percent or proportions, into units based on the arcsine transform have been described previously. This report reviews that work and presents various supplementary equations and tables for calculating and interconverting the proposed units. The relative merits of these data and their application to scores(More)
Normal hearing and hearing impaired subjects listened alternately to continuous discourse processed by pairs of binaural hearing aids. In each case, they were asked to judge which pair of aids reproduced speech more intelligibly. Twenty-three pairs of aids competed in three elimination tournaments and one round-robin tournament. Speech discrimination tests(More)