Pearsons, Karl S. Measurement of speech levels in thepresence of time varying background noise, by Karl S. Pearsons,and Richard D. Horonjeff - [1982] - iii, 89 p. illus. 27 cm. - NASA contractor report, NASA CR-3547 . - NASA contractor report ; NASA CR-3547. . Bibliography: p. 16. LCCN: Subjects--Topical Terms: Noise--Measurement. LC Class. No.: TL521.3.C6 / A3 no. 1117 Dewey Class. No.: 620.23 PEA H