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..
Continue reading the main story. Continue reading the main story. Pernell Roberts, the outspoken actor who played Adam Cartwright, the thoughtful eldest son on televisionâs seminal western series âBonanzaâ and who was the last surviving member of the showâs original family, died Sunday at his home in Malibu, Calif.He was 81.n obituary on Tuesday about the actor Pernell Roberts misstated the cause of death. His lawyer and friend Richard A. Stone said it was pancreatic cancer, not prostate cancer. The obituary also misstated the year Mr. Robertsâs son, Christopher, died.