BHI NEIM 1031 User manual

Page 1
Noise Eliminating In-Line Module
1031-106D
Issue C
bhi
NEIM 1031
7
10
7
10
Connections
NEIM1031
Overload
Output Level
Input Level
Line Out Level
Noise Eliminatin
g
In-Line Module
4
2
3
1
Power
56
Off On
OK
2
1
3
456
Out
Audio
Headphone Socket
Noise Cancellation
9
8
Filter Level
On
bhi
0=MIN
9
8
7=MAX
12-24VDC Input
Input Selector
+-
AudioLine In Line
SOUND ENGINEERING SOLUTIONS

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Important Information
Copyright
This publication, including all photographs and illustrations
isprotectedunderinternationalcopyrightlaws,withallrights
reserved. Neitherthismanual,noranyofthematerialwithin,
maybe copied or reproducedwithout the written consentof
bhi Ltd.
Disclaimer
Theinformationinthisdocumentissubject to changewithout
notice. bhiLtdmakes no representations orwarrantieswith
respecttothecontentshereofandspecificallydisclaimsany
implied warranties of merchantability or fitness for any
particular purpose. Furthermore, bhi Ltd reserves the right
to revise this publication and to make changes from time to
time in the content hereof without obligation of bhi Ltd to
notify any person of such revision or changes.
The NEIM1031 may be connected to audio recording
equipment. The user is responsible for complying with any
copyrights, or legislation regarding recording of material.

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Contents
1. Introduction 4
2. Packing List 4
3. Connections 5
3.1 Connector description 5
3.2 Connectorlayout 6
3.3 Typical connections 7
3.4 Radio communications 8
3.5 Audio restoration 9
3.6 Surveillance/CCTV/Video 10
3.7 Recording using a PC sound card 11
3.8 Connecting several audio sources 12
4. Controls 13
4.1 Controllayout 13
4.2 Control functions 14
5. Setup 16
5.1 Signal levels 16
5.2 Noise cancellation 16
6. Troubleshooting/FAQs 18
7. Specifications 19
8. Accessories 21
8.1 Power 21
8.2 Audio 21
8.3 Audio adaptors 22
8.4 Headphoneadaptors 22
9. bhi Support 23

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1. Introduction.
The NEIM1031 In-line Noise Eliminating Module
incorporates DSP technology to remove unwanted
background noise and interference from speech.
It has 8 switchable levels of noise cancellation to allow
the user to optimise the unit for their level of noise and
interference.
Themodulehas connections forhighand low levelaudio
signals.
Theunitisdesignedtobe easilyconnectedintotheaudio
path of noisy signals where the intelligibility and clarity
of speech needs to be improved.
Note:
The NEIM1031 is not designed to pass music.
2. Packing List.
The NEIM1031 is shipped with the following:
Description bhi Part No.
nNoise eliminating module NEIM1031
nFused Power Lead 1030-FPL
nMono Audio lead 1.2M ALD-001
nOperating manual 1031-106D

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3. Connections.
All audio connections are at the rear of the unit. The
headphone connection has been placed at the front of
the unit for easy access.
As the audio signals are bypassed when the power is
removed there is no need to disconnect the unit when
not in use.
The diagram on the following page shows the position
of all the connectors.
3.1 Connector Description:
Line In: Phono socket.
Low level audio input.
Audio In: 3.5mm mono jack socket.
Speaker level input (for example an
extension speaker socket).
DC Power: 2.1mm power connector. Centre +Ve.
12-24VDC 500mA Input.
Headphone: 3.5mm mono jack socket.
Amplified output. This connection
over rides the audio out socket. This
socket may also be used to drive an
extension speaker.
Audio out: 3.5mm mono jack socket
Amplified output to drive an extension
speaker. This socket is disabled when
the headphone socket is used.

Page 6
7
10
7
10
Connections
NEIM1031
Overload
Output Level
Input Level
LineOutLevel
Noise Eliminatin
g
In-Line Module
4
2
3
1
Power
5 6
Off On
OK
2
1
3
456
Out
Audio
Head phone Socket
Noise Cancellation
9
8
Filter Level
On
bhi
0=MIN
9
8
7=MAX
12-24VDC Input
Input Selector
+-
AudioLine In Line
Audio In
Line In
Audio out
Line out
3.2 Connector Layout.
DC Power
Supply
Headphones
(or extension speaker)
Line out: Phono socket
Low level audio out. For connection to
an amplifier, recorder, or any other line
level device.
Top View

Page 7
14.2000
000
14.195.00
bhi
3.3 Typical Connections.
Audio Amplifier
Headphones
(or extension
speaker)
Extension Speaker
Recording Device
Audio source
OR
3
4567
8
9
10
3
4567
8
9
10
1
2
OK Overload
Input Level
Line Out Level
Output Level
Power
Noise Eliminating In-Line
M
Headphone Socket
ConnectionsInput Selector
Out
Audio Line InAudio
Line
bhi
On
Off
Filter Level
0=MIN 7=MAX
On
Noise Cancellation
12-24VDC Input
+-
0
NEIM1031
1
2
Note:
Audio adaptors are
available to suit most
applications, see
accessories in
section 8.
DC
supply
Optional Mains
adaptor
Line in
Line Out
Audio In
Audio
Out
12-24V DC
(EXSPR-001)
(See page 20)

Page 8
14.2000
000
14.195.00
bhi
3
4567
8
9
10
3
4567
8
9
10
1
2
OK Overload
Input Level
Line Out Level
Output Level
Power
Noise Eliminating In-Line
M
Headphone Socket
Connections
Input Selector
Out
Audio Line InAudio
Line
bhi
On
Off
Filter Level
0=MIN 7=MAX
On
Noise Cancellation
12-24VDC Input
+-
0
NEIM1031
1
2
3.4 Radio communications.
The following pages show typical applications and
connections to the NEIM1031. For connection of
headphones or extension speakers refer to the diagram
on page 7. Numbers in brackets indicate bhi part
numbers. These are available as optional extras - see
accessory section.
(ALD-001 3.5mm mono-mono)
Receiver
or
Transceiver
Extension Speaker
(EXSPR-001)
Audio Out
Audio In

Page 9
3
4567
8
9
10
3
4567
8
9
10
1
2
OK Overload
Input Level
Line Out Level
Output Level
Power
Noise Eliminating In-Line
M
Headphone Socket
ConnectionsInput Selector
Out
Audio Line InAudio
Line
bhi
On
Off
Filter Level
0=MIN 7=MAX
On
Noise Cancellation
12-24VDC Input
+-
0
NEIM1031
1
2
3.5 Audio restoration.
Connect the audio source and recording device as
shown. If the source is monaural, one channel may be
fed directly into the recorder to copy the unprocessed
audio for comparison.
(ALD-003 phono-phono)
Line Out
Line In
Line In
Audio Source
Recording (ALD-003 phono-
phono)
(ALD-003 phono-phono)
Left
Right
Line In

Page 10
3
4567
8
9
10
3
4567
8
9
10
1
2
OK Overload
Input Level
Line Out Level
Output Level
Power
Noise Eliminating In-Line
M
Headphone Socket
ConnectionsInput Selector
Out
Audio Line InAudio
Line
bhi
On
Off
Filter Level
0=MIN 7=MAX
On
Noise Cancellation
12-24VDC Input
+-
0
NEIM1031
1
2
3.6 Surveillance/CCTV/Video.
In applications where the un- altered audio needs to be
recorded. The raw signal can be recorded, and the
cleaned audio is monitored using headphones, or an
extension speaker.
This will record a true copy of the CCTV footage. The
unit can then be used on playback to remove any noise.
Connection to video recording equipment (audio).
Inthisapplication theNEIM1031is beingusedto remove
the background noise being recorded from the video
camera.Again inthisapplication boththe processedand
raw audio are being recorded simultaneously.
Line Out
Line In
Video Camera
Video connection
Unprocessed audio
Video Recorder
(ALD-003 phono-phono) (ALD-003 phono-phono)
Line In Line out