FONIX® 8000 - Frye Electronics

Glossary of Terms for the FONIX 8000 227
NAL National Acoustic Laboratories of Australia.
NBS National Bureau of Standards (U.S.), now known as National Institute
of Standards and Technology.
NOISE The 8000’s method of producing a more stable reading by averaging
rEDUCTION many samples.
OCCLUSION Low-frequency intensification in the loudness level of bone-conducted
EFFECT signals resulting from the blocking of the ear canal.
OES Occluded Ear Simulator. An option on the 8000, using three special
couplers, that provides the same data obtained with a standard ear
simulator.
POGO Prescription Of Gain and Output. A hearing aid prescription formula.
POWEr The output of an aid, in dB SPL.
PT BUrST A burst of ten pure tones corresponding to standard audometric
frequencies. The entire signal lasts for less than two seconds.
PUrE TONE A testing tone consisting of only one frequency.
rEAL-TIME The ability to view instantly the results of hearing aid tests.
TESTING
rEFErENCE The location in a test chamber where the microphone of a hearing aid
POINT must be placed for accurate testing. In the 8000, it is the small circle in
the center of the test chamber.
rESONANCE The tendency of an acoustic system to reinforce sounds of a certain
frequency, the frequency determined by the shapes and sizes of the
components of the system.
rESPONSE LIMIT The high and low points of the frequency range found in the ANSI test
sequence conditions.
rMS Root Mean Square. An overall measurement of the signal going in or
coming out of a hearing aid. When measuring with Pure tones, the
RMS level at each individual frequency will be the same as the level
shown at each frequency on a response curve. When measuring with
a Composite Tone, the (overall) RMS level will be several dB higher
than the level at each frequency on a response curve, since all the
frequencies are presented at once.
SATUrATION The condition where any further increase in input level will yield no
further increase in output level.
SMOOThING A “rounding-off” of a curve, removing minor peaks and valleys, to
create a more readable curve, using a method that is equivalent to
warbling the input signal.