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..
On the series, his absence was woven into the plot as Trapper John was âdischargedâ from the service. Rogers turned down the Trapper John role in the series Trapper John, M.D. (Pernell Roberts played the part) because he didn't want to be typecast as a physician. Subsequently, he starred in TV movies that dashed that image.