Investigation of Speech Transmission Testing

摘要

The purpose of the 4 studies was to investigate speech perception under various filter conditions with peak power limited systems and additive Gaussian noise channels. Three S/N ratios corresponding to 80%, 60%, and 40% correct word scores were used as well as 3 different filters: G(omega)=BPF, a wide band-pass filter, 100-6000 cps; G(omega)=H(omega), an optimum filter, and a G(omega)=absolute value of (H(omega))sq., a filter with twice the slope of the optimum filter. Study 1 showed significant relations between S/N ratios, filters, and order of presentation of filter conditions as well as some interaction effects. Conditions in this study were not randomized. Study 2, which presented S/N ratios and filter conditions in random order to Ss showed similar significant results. Also error scores were related to the position of the consonant in the word, that is, whether coming initially or finally. Study 3, a similar study except using a vowel Rhyme list showed a significant main effect only between S/N ratios. Significant filter and S/N ratio effects were obtained in Study 4 which investigated vowels and consonants in one study. (Author)