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..
Pernell Elvin Roberts Jr. was born in Waycross, Ga., on May 18, 1928, and attended Georgia Tech and the University of Maryland, where academics took a distant second to his burgeoning interest in theater. In 1986, Rudy Pugliese, who had directed the theater group at College Park for years, said Mr. Roberts already had it while on campus.