FMR-1
Equalized Acoustic System
Microtronix announces the FMR-1, a new
product that provides an easy to use audio interface to the Microtronix
Acoustic Head or the Acoustic Transducer Kit. The FMR -1 combines the
microphone pre-amplifiers and the audio power amplifier for the Artificial
Mouth in one easy to use package but the real marvel is the DSP equalizer.
Using a 32-bit DSP engine the FMR-1 flattens the Artificial Mouth acoustic
output to plus or minus 0.5 dB from 100 Hz to 10 kHz. This means that
complex test signals can be applied to the telephone under test and they
will appear as accurate acoustic signals at the mouth reference point
(MRP).
After the initial master calibration is
performed the FMR-1 can self-test for acoustic drift and auto-calibrate
with press of button or by remote control. If a quick confirmation is all
that is required the FMR-1 can do a quick check at 1kHz.
The FMR-1 provides the wireless telephone test engineer with an ideal
Artificial Head complete with microphone pre-amps, an Artificial Mouth
power amp and DSP equalizer in one package. A standards compliant and
reliable solution to the problem of connecting electronic measurement
devices to any telephone handset.
Acoustic Head:
The Microtronix Acoustic Head is designed for factory testing. The base is
heavy with damped urethane rubber feet to provide low frequency acoustic
isolation from factory vibration. The ergonomic design of the clamping
mechanism provides smooth operation and minimizes operator fatigue.
The Microtronix Artificial Ear is fully
compliant with the IEC 318 Type 1 specification and the Artificial mouth
is designed to comply with the ITU-T P.76. This means that measurements
made with the FMR-1 system can be directly correlated with other compliant
equipment. Custom rubber seals are available on request to accommodate
unusual handset designs. To ensure repeatable handset position, critical
to accurate acoustic measurement, Microtronix can create a molded locating
ring formed to your handset design.
Acoustic
Transducer:
The Acoustic Transducer Kit allows test engineers who purchase
the FMR-1 to design test fixturing by using the the excellent features of
the Microtronix Artificial Ear and Artificial Mouth. The devices are sold
with engineering drawings of how to mount the transducers so that correct
orientation is maintained per ITU-T recommendations. A pre-amplifier is
provided with the kit to interface to the Artificial Ear and Artificial
Mouth microphones
The Microtronix Artificial Ear is fully compliant with the IEC 318 Type 1
specification. In the kit the ear is mounted in the Microtronix spring
mounted assembly. This ensures correct pressure to the acoustic ear rubber
seal at all times. Custom rubber seals are available on request to
accommodate unusual handset designs.
The Artificial mouth is designed to comply with the ITU-T P.76. This means
that measurements made with the FMR-1 system can be directly correlated
with other compliant equipment. The artificial mouth comes with the
"Loudness Rating Guard Ring Position" (LRGRP) adapter but can
also be mounted in the AEN or REF positions by simply removing the
adapter. |
