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..
Robin RenÃ© Roberts (born November 23, 1960) is an American television broadcaster. Roberts is the anchor of ABC's Good Morning America. After growing up in Mississippi and attending Southeastern Louisiana University, Roberts was a sports anchor for local TV and radio stations. Roberts was a sportscaster on ESPN for 15 years (1990â2005). She became co-anchor on Good Morning America in 2005.