SHS 430 1st Edition Lecture 7 OUTLINE OF LAST LECTUREI. Review of assistive listening devicesII. Hearing Aid, etc. checksOUTLINE OF CURRENT LECTUREI. Speech Perception/Psychoacoustic ParametersCURRENT LECTUREI. Speech Perception/Psychoacoustic Parameters-Intensity is the physical measurement of what is psychologically perceived as loudness.-Range of intensities in speech can vary + or – 30 dB-Average conversation speech is 55-65 dB-The loudest is /aw/ 85 dB-The softest is /th/ 35 dB-Frequency is the physical measurement of what is psychologically perceived as pitch.-Spectrum of speech is 50-10,000 Hz but most connected discourse is 100-6000 Hz. The greatest energy is typically at 500 Hz (80%). Phones typically pas 300 Hz to 3K Hz.-Fundamental frequency for males- 130 Hz and females- 260 Hz.-Vowels are low frequency and responsible for acoustic power.-Consonants are high frequency and responsible for intelligibility. -Suprasegmentals (tone, stress)- low frequency -Distinctive features (manner, place)- high frequency but nasality is low frequency.-S and Z are responsible for 20 pieces of linguistic information.-What about noise? Ambient noise is usually low frequency while reverberant conditions yield high frequency.-The ideal signal to noise ratio for optimal comprehension is +20 dB.-The critical frequencies for a child learning language are much different from that of an adult who already has language. This plays an important role in early acquisition as well as later school performance.-Rate or duration parameters-30-300 msec for the syllabic range.-Average rate is 15 phonemes/second.-Many factors affect duration, vowels tend to be longer.These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.-Transitional parameters- The acoustic properties of a phoneme will be affected when produced in connected discourse. Adjacent phonemes will overlap and naturally affect each other. Duration of a vowel can be altered to give info to phoneme that follows.-So consider for a moment all of these parameters and the obvious implications that relate to hearing