An Overview of the FP35 13
The composite signal is especially important for the measurement of automatic
gain control and signal processing hearing aids.
The digital speech signal is a randomly interrupted composite signal used for
testing high-end digital aids with “noise-reduction” or “speech enhancement”
features. See Appendix F for details.
Real-Ear Option
You can order the FP35 with the Real-Ear Option so that you can do tests on the
hearing aid while it is in the client’s ear. It is then possible to individualize the
fitting of a hearing aid—a necessary step since a coupler measurement can sel-
dom tell the operator exactly what sound is received by the client. Many factors
affect sound on its way to the eardrum. By measuring with a probe microphone,
you will know what is really happening in your client’s ear.
The probe microphone can also be used as a reference microphone while mak-
ing coupler measurements.
External Monitor Option
This hardware option allows the connection of the FP35 analyzer to an external
monitor. When connected, the FP35 displays on both its internal LCD monitor
and the connected external monitor. Although the display is always only in two
colors, most standard flat screen and VGA computer monitors can be used.
IEC
You can add the IEC (International Electrotechnical Commission) test sequence
to your FP35 analyzer. This automated sequence lets you test the performance
of hearing aids in accordance with the IEC 118-7 standard as amended in 1994.
JIS
An automated test sequence that follows the JIS standard, widely used in Japan.
ANSI
The ANSI 96 and ANSI 03 automated test sequences are available as an option
on your FP35. They provide you with the means to quickly and accurately test a
hearing aid in accordance with the ANSI S3.22 standard.
CIC Option
This option consists of a 0.4 cc CIC coupler and software correction factors. The
CIC correction factors are available in the Coupler Mode by selecting the CIC
coupler in the Coupler Menu.
Audiometer Option
This adds pure-tone air audiometric measurements to your FP35 hearing aid
analyzer. You can either take the measurements with insert earphones or with a
sound field speaker. See Chapter 9 for more details.
