Installation manual

Page 5
1.1 bhi
bhi Ltd are specialists in the design, development and manufacture
of Digital Signal Processing (DSP) noise cancelling products and
other specialist electronics.
1.2 Introduction
The bhi noise eliminating speakers greatly improve the clarity and
intelligibility of speech in radio communications. They are suitable
for use in many applications where high background noise and
interference mean that you cannot clearly hear what is being said.
The NES10-2 and NES-5 enable the user to listen and concentrate
“stress-free”.
Suitableapplicationswherethespeakerswillbeofgreatbenet
to the user include radio amateur base stations, CB radios, two-way
radios, HF radios, marine communications, scanners, taxi base sta-
tions and hands-free car kits.
The NES10-2 and NES-5 are compact and easy to install. They
incorporate DSP technology and are fully adaptive to any change
in noise levels and interference.
On the NES10-2 the noise cancelling can be switched on or off
and there are 8 user selectable noise cancellation levels, whilst
theNES-5isaplugandgomodelwhichhasaxedlevelofnoise
cancellation.
1. Overview
Page 28
Noise Cancelling Headphones (NOT DSP)
Order code:NCH
The headphones employ microphones to moni-
tor the ambient noise. These microphones are
wiredoutofphaseandfeedadifferentialamplier
which generates an opposing signal to that of the
unwanted noise. This signal then cancels out the
unwanted background noise.
These active noise reduction (ANR) headphones reduce the ambient back-
ground noise to allow you to listen to the program source peacefully.
 Lightweight, folding design thats
ideal for travelling.
 Ambient noise cancelling on/off
switch with LED
 Warning sirens and telephone rings
remain unaffected.
 Discrete battery holder AAA size.
(Battery included)
 30mm Neodymium drivers
 Supplied with carry pouch
 1.6M cable terminating in a 3.5mm
jack plug plus 2 pin aircraft adapter.
The headphones are sup-
plied with an aircraft adapter,
so you can now listen to the
lm,orCDplayerwithoutall
the jet engine noise.
The headphones effectively remove noise such as blower noise, ambient
noise, jet engine noise or music from another room.
Features:
Free aircraft
adapter and carry
bag