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..
She has appeared in the shows Without a Trace and Back to You, in both instances playing the daughter of the lead characters. She is Vanessa Marano 's younger sister and is currently nineteen years old.She stars as Ally Dawson on the Disney Channel 's Original Series Austin & Ally.he has also appeared in Dexter as the child version of Debra Morgan. She has also played the child version of a character played by Diana Scarwid, Alice Shaw, sister of Angela Petrelli, on Heroes. She currently stars and is most known for her role in the Disney Channel series Austin & Ally.