BRUEL & KJAER 4128-C - 2.2 Mouth Simulator Operating Characteristics

HATS Type 4128-C, Handset Positioner Type 4606 – User Manual18
Fig.1.8 to Fig.1.11 show the elevation angles to which the various measurement files
correspond and for which azimuth angles measurements are given within these files.
Numbering in ordinary type is for measurement data of the right ear and that in italics is for
measurement data of the left ear.
MNFF
(_01_20)
Mouth normalised free-field responses 100Hz – 10kHz Typical data MNFF_01
 MNFF_20 correspond
to the measurements
made at the
measurement points
given in ITU-T Rec.
P. 51
a
. See Table 1.3
MSP_1VIN Sound power with mouth insert, 1V
drive
100Hz – 10kHz Typical data
MSP_1V Sound power without mouth insert, 1V
drive
Typical data
MSPMRPIN Sound power relative to sound pressure
at MRP, with mouth insert
100Hz – 10kHz Typical data
MSPMRP Sound power relative to sound pressure
at MRP, without mouth insert
Typical data
ERP-DRP Ear Reference Point (ERP) to Drum
Reference Point (DRP) transfer function
100Hz – 8kHz The ERP-DRP
correction function given
in ITU-T Rec. P.57
b
EEP-DRP Ear Entrance Point (EEP) to Drum
Reference Point (DRP) transfer function
Typical data
ERP-DRPM Ear Reference Point (ERP) to Drum
Reference Point (DRP) transfer function
20Hz – 20kHz Typical measured ERP-
DRP transfer function
a. This document deals with a rotationally symmetrical artificial mouth and not a HATS, so care should be taken when
comparing different sets of results of measurements at these points.
b. The sound pressure measured by the ITU-T Type 3.3 artificial ear (Brüel & Kjær Type 4158-C/4159-C) is referred to the
Drum Reference Point. The correction function given in ITU-T Rec. P.57, Table 2 most be used for converting data to the
Ear Reference Point.
Table 1.2 (cont.) Details of the files on the CD supplied with Type 4128-C. The CD supplied with
Type 4159-C includes LFR_L (the left ear listener frequency response) instead of LFR_R
File Name Contents
Frequency
Range
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