Product Data
Brüel & Kjær
B
K
Head and Torso Simulator — Type 4128
Head and Torso Simulator Type
4128 has been developed for objective
in-situ research and evaluation of:
❍
telephones and headsets
❍
audioconference devices
❍
microphones
❍
headphones
❍
hearing aids and hearing protectors
The design of Type 4128 is based on
an efficient minimum-parameter de-
scription of the median human adult.
It provides a correct representation of
the acoustic field around a human
head and torso.
The acoustic performance and the
main physical dimensions of Head and
Torso Simulator Type 4128 conform to
the requirements of ITU -T Rec.P.58,
IEC 959, and ANSI S 3.36–1985.
The built-in mouth simulator closely
replicates the sound field generated by
the human mouth, including the fre-
quency-dependent motion of the acous-
tic centre in the frequency range which
is important for noise-cancelling micro-
phones.
USES:
❍
Measurements on handset and headset telephones
❍
Measurements on loudspeaking and hands-free
telephones for mobile and domestic use
❍
In-situ/insertion measurements of hearing aids
❍
Evaluation of headphones
❍
Evaluation of hearing protectors
❍
Evaluation of close-talking/noise-cancelling
microphones
FEATURES:
❍
Manikin with surfaces replicating the shape of a
median adult human head and torso
❍
Highly-representative mouth simulator with overload
protection
❍
Highly-representative IEC 711/ITU-T Type 3.3
based calibrated ear simulator (Type 4158) with
built-in
1
/
2
" condenser microphone and microphone
preamplifier
❍
Compliance with the acoustic requirements of
ITU -T Rec. P.58, IEC 959, and ANSI S3, 36 – 1985
❍
Soft Pinnas included for realistic headphone
measurements
