The human ear responds more to frequencies between 500 Hz and 8 kHz and is less sensitive to very low-pitch or high-pitch noises. The frequency weightings used in sound level meters are often related to the response of the human ear, to ensure that the meter is measuring pretty much what you actually hear. It is extremely important that sound level measurements are made using the correct frequency weighting - usually A-weighting.
'Bonanza,' 'Trapper John, M.D.' star Pernell Roberts dies. Pernell Roberts portrayed Dr. John McIntyre on Trapper John, M.D..
Early life. Roberts was born in 1928 in Waycross, Georgia, the only child of Pernell Elven Roberts, Sr. (1907â1980), a Dr Pepper salesman, and Minnie (Betty) Myrtle Morgan Roberts (1910â1988). During his high-school years, Pernell played the horn, acted in school and church plays, and sang in local USO shows.