Frye FONIX 7000, Руководство оператора

Страница: 207 / 216

Glossary of Terms for the FONIX 7000
199
DATA In FONIX analyzers, the word “data” refers to displaying curve
information as a table of numbers.
DEFAULT A choice automatically made by a computer program.
DIN A European-standard connector with pins surrounded by a round
CONNECTOR metal shell.
DISTORTION Elements of a reproduced sound that deviate from the original.
DSIN Digital speech-in noise. The source signal used for testing digital aids.
The ANSI and ICRA speech weightings are available.
EAR CANAL An acoustic property of the ear canal, often characterized by a peak at or
RESONANCE near 3000 Hz. Along with the acoustic properties of the head, torso,
and pinna, the Ear canal Resonance contributes significantly to the
External Ear Effect.
EIN Equivalent Input Noise. The amplitude of internal noise created by a
hearing aid.
ERROR The latitude of inaccuracy in a testing system. It usually is expressed
in +/- units and/or percent.
EXTERNAL See Unaided Response.
EAR EFFECT
FAST FOURIER A computer “short-cut” of the FOURIER TRANSFORM method for
ANALYSIS determining the frequency content of a signal.
FLAT Same as UNWEIGHTED, referring to a signal that has equal amplitude at
WEIGHTED every frequency.
FOURIER A mathematical procedure that changes “time” information into
TRANSFORM “frequency” information.
FREQUENCY The number of vibrations, or cycles, per second, of a periodic wave.
The unit of measurement is Hertz (Hz).
FREQUENCY A measure of the output or gain of a device across a range of
RESPONSE frequencies of the input signal.
FUNDAMENTAL The lowest frequency in a harmonic complex tone, such as the FONIX
FREQUENCY Composite signal. The fundamental frequency determines the “pitch”
of a tone.
FUN-TAK A brand name for a modeling clay-like substance used to attach and
seal hearing aids to couplers.
GAIN The amplification or increase in sound power in a hearing aid. In
testing, it results from subtracting the level of the input from the level
of the output of the aid.