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- W1973886250 abstract "A small megaphone was tested for use in direct voice communication at high voice levels against backgrounds of noise. The voice transmission characteristics of the megaphone were measured. Intelligibility scores were determined for ten talkers, speaking with and without the megaphone, over a range of field voice levels of 70 to 100 db SPL (at 1 meter). A white noise and a low-frequency noise background were employed. Nearly the entire over-all acoustical gain produced by the megaphone was realized in improved intelligibility above both noise spectra. The acoustical gain of the megaphone permitted a lower voice level, and, hence, delayed the deterioration in intelligibility associated with distortions due to shouting. Frequency shifts in the voice spectrum were measured over a range of vocal efforts from conversational maximum shout. Control tests demonstrate that the voice-frequency shifts associated with shouting are not the primary factor in the deterioration of intelligibility; the frequency shifts appear to be only symptomatic of serious vocal distortions in shouting." @default.
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- W1973886250 date "1958-07-01" @default.
- W1973886250 modified "2023-09-26" @default.
- W1973886250 title "Shouting over Noise with a Megaphone" @default.
- W1973886250 doi "https://doi.org/10.1121/1.1929939" @default.
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