title: A voice accumulation--validation and application.
abstract: Studies of vocal behavior under natural conditions require suitable techniques for obtaining records of voice use. We describe the operation of a newly designed voice accumulator that allows registration of fundamental frequency and phonation time during a 12-hour period. The device is based on microprocessors and allows accumulation of the voice fundamental frequency within 60-600 Hz. The voice signal is picked up by a contact microphone attached to the front part of the neck. Analysis of fundamental frequency distribution and phonation time is made on a personal computer. Validation of the device shows it to provide accurate measurements of fundamental frequency, although it tends to underestimate phonation time. In a field test, the accumulator was used to analyze vocal behavior during two work-days in a group of nurses and a group of speech pathologists. Overall, the speech pathologists had a lower fundamental frequency level and higher values of phonation time than the nurses. These field results confirm the validation of the voice accumulator.
authors.affiliation: University of Gothenburg, Sweden.
authors.forename: A C
authors.initials: AC
authors.lastname: Ohlsson
authors.forename: O
authors.initials: O
authors.lastname: Brink
authors.forename: A
authors.initials: A
authors.lastname: Löfqvist
mesh_terms: D000328:Adult; D001330:Electronic Data Processing / Q000295:instrumentation*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010699:Phonation; D014831:Voice