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..
Deborah Roberts was born on September 20, 1960 in Perry, Georgia, USA as Deborah Ann Roberts. She is an actress, known for 20/20 (1978), Good Morning America (1975) and ABC 2000: The Millennium (1999). She has been married to Al Roker since September 16, 1995. They have two children.