audioscan verifit, User Manual

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Verifit
®
User's Guide Version 4.8 © November 2016
OSPL90 (output SPL for 90-dB input SPL), The SPL developed in a 2cc coupler when the input SPL is 90 dB,
with the gain control of the hearing aid full-on (ANSI S3.22).
Output Compression , a form of AGC in which the signal level is regulated at the output.
PC, Peak-clipping , a method of limiting MPO by truncating the electrical signal supplied to the output
transducer. The resulting acoustic signal may not be truncated but will be distorted.
PC , personal computer
PCL , Printer Command Language , a page description language developed by Hewlitt-Packard as a printer
protocol and has become a defacto industry standard. Originally developed for early inkjet printers in 1984, PCL
has been released in varying levels (1 through 6) for thermal, matrix printer and page printers.
PCM, Pulse-code modulation, a method used to digitally represent sampled analog signals. In a PCM stream,
the amplitude of the analog signal is sampled regularly at uniform intervals, and each sample is quantized to the
nearest value within a range of digital steps.
PCR , Power Concentration Ratio , a measure of the degree to which a large amount of power is concentrated
at a small number of frequencies in the output of a hearing aid.
Postscript, a computer language for creating vector graphics. It is a dynamically typed, concatenative
programming language created in 1982. It is best known for its use as a page description language in the
electronic and desktop publishing areas.
Probe microphone , microphone (which may include an extension tube) having a sound inlet which is small
enough to be acoustically unobtrusive when inserted into the ear canal (ANSI S3.46).
Pure tone , a signal containing one, and only one, frequency; a sinusoidal acoustic signal.1
REAG, Real-Ear Aided Gain , difference, in dB as a function of frequency, between the SPL (or BSPL) at a
specified measurement point in the ear canal and the SPL (or BSPL) at the field reference point, for a specified
sound field, with the hearing aid in place and turned on (ANSI S3.46).
REAR, Real-ear Aided Response , the SPL (or BSPL) as a function of frequency, at a specified measurement
point in the ear canal for a specified sound field, with the hearing aid in place and turned on (ANSI S3.46).
RECD, Real-Ear-to-Coupler Difference , difference, in dB as a function of frequency, between the SPL (or
BSPL) produced by an insert transducer at the eardrum and in a 2cc coupler. HA-1 or HA-2 coupler should be
specified.
REDD, Real-Ear-to-Dial Difference , difference, in dB as a function of frequency, between the SPL (or BSPL)
measured at the eardrum and the audiometer dial setting that produced it. It is specific to the client, headphone
and audiometer used to generate it.
REIG, Real-Ear Insertion Gain, difference , in dB as a function of frequency, between the REAG and the
REUG taken with the same measurement point and the same sound field conditions. REIG = REAG – REUG.
ANSI S3.46.
REOR, Real-Ear Occluded Response , SPL (or BSPL), as a function of frequency, at a specified measurement
point in the ear canal, for a specified sound field, with the hearing aid in place and turned off (ANSI S3.46). The
REOR is used to evaluate the seal of an earmold. It is not related to the required gain of a hearing aid.
RESR, Real-Ear Saturation Response, obtained using a narrow-band signal at a level high enough to saturate
the hearing instrument (usually 85-90 dB SPL)
REUG, Real-Ear Unaided Gain , difference, in dB as a function of frequency, between the SPL (or BSPL) at a
specified measurement point in the ear canal and the SPL (or BSPL) at a field reference point, for a specified
sound field, with the ear unoccluded (ANSI S3.46).
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