BHI NEDSP1062 KBD User manual

NEDSP1062-KBD Operating ManualNEDSP1062-KBD Operating Manual Page 1
bhibhi
bhibhi
bhi
NEDSP1062 KBD
Amplified Noise Eliminating DSP Module
Installation and Operating Manual
Sound Engineering Solutions from bhi
1062-107D
Issue E
Page 40
bhi Ltd
22 Woolven Close
Burgess Hill
West Sussex
RH159RR
tel: [phone]
fax: [phone]
[email protected]
www.bhi-ltd.co.uk
bhibhi
bhibhi
bhi
Sound Engineering Solutions
DSP Noise Cancellation

NEDSP1062-KBD Operating ManualNEDSP1062-KBD Operating Manual
Page 2
Copyright
This publication, including all photographs and
illustrations is protected under international
copyright laws, with all rights reserved. Neither
this manual, nor any of the material within, may
be copied or reproduced without the written
consent of bhi Ltd.
Disclaimer
The information in this document is subject to
change without notice. bhi Ltd. makes no
representations or warranties with respect to the
contents hereof and specifically disclaims any
impliedwarrantiesofmerchantabilityorfitnessfor
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.
Important Information
Page 39
8.3 NEIM1031 In-line module.
Then NEIM1031 provides a flexible solution to noise reduction. It
features both amplified inputs and outputs, along with line level sig-
nal processing. The unit also features an audio bypass when the
unit is switched off, so there is no need to disconnect when not in
use.
Features:
•Fully adaptive noise cancellation 9 -35dB
•8 user selectable noise cancellation levels
•Mono earpiece socket
•Input sensitivity control
•Noise cancellation On/Off switch
•Line level in/out
•Input overload indication
•Power on/off with audio bypass.
8.4 NEIM1031 accessories.
8.5 DSP modules.
LSPKR
20 Watt extension speaker
for use with the NEIM1031.
Fitted with a 3.5mm mono
jack plug.
1031-STA
MountingstandfortheNEIM1031.
Allows the NEIM1031 to be ad-
justed for the most comfortable
operatingpostion.
8. Other bhi products.
DSP module range.
NEDSP1061: Low signal level module
NEDSP1062 - KBD: Low signal level module
controlled by single button
keyboard.
NEDSP1062 - KBD: Amplified DSP module
controlled by a 2 button
keyboard.
1030-UKPA UK DC power adapter
1030-EUPA European DC power adapter

NEDSP1062-KBD Operating ManualNEDSP1062-KBD Operating Manual Page 3
1. Introduction
1.1 NEDSP1062-KBD features 5
1.2 Limitations 5
1.3 Module connection and mounting 6
1.4 Keyboardmounting 7
1.5 Sounder mounting 8
1.6 DSP noise cancellation 9
2. Module description
2.1 Block diagram 10
2.2 Modulelayout 11
2.3 Pin functions 11
2.4 Controls 12
2.4.1 PCB controls 12
2.4.2Keyboard 12
2.5 Electrical characteristics 12
3. Installation
3.1 Installationoverview 16
3.2 Module setup 17
3.2.1 Overview 17
3.2.2 Suggested set up procedure 17
3.2.3 Changes to output load 18
3.2.4 Other signal considerations 18
3.3 Driving the module from a low level signal 19
4. Functions
4.1 Keyboard 20
4.1.1 Power button 20
4.1.2 DSP level button 20
4.2 Set up 21
4.3 Demonstration modes 23
4.4 Noise cancellation levels 24
5. Application notes
5.1 Yaesu SP8 25
5.2 KenwoodSP31 28
5.3 bhi label 31
Contents
Page 38
8. Other bhi products
Other noise cancellation products from bhi. Visit www.bhi-ltd.co.uk
for more information.
DSP noise cancellation built into a compact
speaker unit. the unit provides an easy to
install solution to noise reduction
Features:
•Fully adaptive noise cancellation 9 -35dB
•8 user selectable noise cancellation levels
•Mono earpiece socket
•Input sensitivity control
•Noise cancellation On/Off switch
•LED indication of power and noise cancellation
•12-24VDCoperation
•On/Off audio bypass switch.
•Greatly improved signal to noise ratio
•Easy to install with adjustable mounting bracket
•2m audio lead
•Optional extras avaiable.
8.1 NES10-2 MKII Noise Eliminating speaker.
Basic plug and go noise cancelling
speaker preset to 20dB of noise
reduction.
Features:
•Fully adaptive noise cancellation 20dB
•12-24VDCoperation
•Compact robust speaker unit.
•Greatly improved signal to noise ratio
•Easy to install with adjustable mounting bracket
•2m audio lead
8.2 NES5 Noise Eliminating speaker.
8. Other bhi products.

NEDSP1062-KBD Operating ManualNEDSP1062-KBD Operating Manual
Page 4
6. Physical dimensions
6.1 Physical dimensions 32
6.2 Keyboardholedrillingdetail 35
7. Troubleshooting
Troubleshooting 37
8. Other bhi products
Other bhi products 38
Page 37
Start
Increase input
level
Over load LED
illuminates? No
Yes
Reduce input
so LED goes
out
Increase output
level P1
Sufficient
output volume? Supply voltage
<13.8 Vdc
Input level
too low
Increase
supply
voltage
Finish
Yes
Disconnect
R6
(see section 3.3)
Over load LED
illuminates?
Add additional
amplification
NoYes
No No
Yes
7.2 Insuffucient output volume
7. Troubleshooting
Input
signal
Overload
LED on Reduce input
level
Increase
output level
P1
Apply
audio signal
Increase input
signal
P2
No
Yes
No
Yes
Audio
out?
Finish
Start
Yes
No
7.1 No audio out
7. Troubleshooting.

NEDSP1062-KBD Operating ManualNEDSP1062-KBD Operating Manual Page 5
1. Introduction.
The NEDSP1061-KBD is a modular solution for noise
reduction.ItincorporatesDigitalSignalProcessing(DSP)
technology to provide up to 35dB of noise cancellation
and 65dB of tone reduction. The module features an on
boardpoweramplifiertoallowittobeeasilyincorporated
in to existing equipment by installing the module in line
with the loudspeaker. All functions of the module are
controlled by an easy to use keyboard.
1.1 NEDSP1062-KBD module features:
Fully adaptive noise cancellation up to 35dB
Input and output level controls
Input level over load indication
Virtually no distortion to speech signal
Easy to install
4/8 levels of noise reduction (selectable)
Frequency response 50Hz - 4.3KHz
3 Watts output (4W)
Single button operation of DSP mode with LED and
audible indication
12 - 18V supply range
27dB on board gain
Power on/off - bypass pushbutton
Small size 37 x 50mm (DSP pcb)
Audio bypassed when power disconnected
Supplied with fixing and wiring kit and all labels
1.2 Limitations.
This module is designed to pass speech. Other signals
suchasdata,music and morse (CW) will to some degree
pass through, but the integrity of these signals
cannot be guaranteed.
1. Introduction.
Page 36
<This page is intentionaly blank>

NEDSP1062-KBD Operating ManualNEDSP1062-KBD Operating Manual
Page 6
Figure 1. Mounting options
1.3 Module connection and mounting
The module is supplied with a pre-wired 2.1mm power
connector. The centre pin is positive. The audio in and
out are pre-wired pairs of wires, ready to be connected
intheaudiopath.Theheatsink doubles upasamounting
bracket.
This module is designed to be driven from a high level
signal, capable of driving a load of 22W.
(The module can be easily modified to be driven from a
low power signal, see section 3.3 for more information).
The module can be mounted
using the supplied self adhesive
foam pad. Ensure that none of
the circuit pins can make contact
with any metallic parts.For improved heat dissipation
and a more rigid mechanical
fixing the heatsink can be
reversed and used as a bracket.
Note that the heatsink is at 0V
potentialandthereforemayhave
to be electrically insulated from any other metallic parts.
Alternativelythemodulehasfour
fixing holes which allow it to be
fixed to pillars.
(See section 6 for hole details
and physical dimensions).
1. Introduction.
Using the heatsink
as bracket
Self adhesive
pad
Mounting using
PCB pillars
Page 35
6. Physical dimensions.
6.2 Template.
The following drawing shows the sizes and positions of
holesforthekeyboard.
Figure 36. Keyboarddrilling detail .
Nottoscale
alldimensionsinmm
29.8
18.5
13.4
6.7
6.7
10.9
5.5
4mm 4mm 4mm
3mm CSK
to5mm

NEDSP1062-KBD Operating ManualNEDSP1062-KBD Operating Manual Page 7
1. Introduction.
If the installation has limited
space, and is housed in a metal
enclosure, the heatsink can be
removed, and the module
mounted directly on the chassis.
Thevoltageregulator needstobe
correctly insulated as the tab is
connected to 0V. Insulate both
the regulator and mounting
screw. For improved heat
dissipationusea suitable thermal
pastebetween the power devices
and the mounting.
Figure 2.
Direct mounting.
Figure 3. Keyboard mounting 1.
The keyboard is
mountedthroughthe
enclosure to provide
an easy to use
interface. The
module is supplied
with a label to place
over the keyboard.
When the enclosure is thick enough the keyboard is
retained using a countersunk screw (supplied), which is
hidden by the label, see figure 3 above. Do not over
tighten the mounting screw.
keyboard
Front panel
label
Retaining
screw
Front
panel
Insulator
Insulator
Voltage
Regulator
1.4 Keyboard mounting.
(not supplied)
(not supplied)
Page 34
6. Physical dimensions.
Figure 34. Keyboard dimensions.
Figure 35. Power connector hole size.
29.8
25.3
20.2
13.4
6.8 9.5 4.7
7.5
3.2
10.9
5.5
3
8mm diameter

NEDSP1062-KBD Operating ManualNEDSP1062-KBD Operating Manual
Page 8
Figure 4.
Keyboard mounting 2.
If the enclosure is too
thin to incorporate a
countersunk screw
(such as fitting into
sheetmetal)then it can
be retained by a
instrument head
screw.
The label needs to be
cut out to allow the
screw to pass through
from the outside. This
can be easily achieved
byapplyingthelabel to
the panel, then carefully cutting around the screw hole,
with a sharp knife. Again do not over tighten the screw.
Nut &
washer
Front panel
label
keyboard
Retaining
screw
Front
panel
1.5 Sounder mounting.
Cutasmallpieceofthe
self adhesive foam
(supplied)to mount the
sounder.
Do not cover the small
hole in the face of the
sounder.
For best results mount
the sounder where it
can radiate sound to
the outside the case,
for example on an air
vent. Figure 5. Sounder mounting
Sounder
Backing paper
Backing
paper
Self adhesive
foam
Case
Keep this
hole clear
Cut hole
for screw
1. Introduction.
Page 33
6. Physical dimensions.
Components fitted to
rear of PCB
Figure 32. Overall dimensions.
Figure 33. Hole dimensions of power devices - for direct
mounting applications.
16.1
5.3
17.9
16.4
Viewed from
the end of
the module
34.2
64.4
5.8

NEDSP1062-KBD Operating ManualNEDSP1062-KBD Operating Manual Page 9
1.6 DSP Noise cancellation.
The bhi DSP processes the incoming signal and then
differentiates the speech from the noise. The unwanted
noise and interference is then attenuated to leave only
thespeech.The followingdiagramsaretakenfrom actual
audio signals and illustrate how the signal is being
processed.
Figure 6. Noise cancellation.
Original signal.
Speech with a lot of
background noise
Processed speech.
Speech with reduced
noise
Speech Noise Reduced noise
1. Introduction.
Page 32
23.4
2.97
30.3
34.3
36.5
49.6
2.97 Pin 1
3mm dia
6. Physical dimensions.
6. Physical Dimensions
Figure 31. Mounting hole positions.
Top
6.1 Physical dimensions.
The following diagrams detail the physical dimensions
of the module. All dimensions are in mm.

NEDSP1062-KBD Operating ManualNEDSP1062-KBD Operating Manual
Page 10
2. Module description.
Figure 7. NEDSP1062-KBD block diagram
1
3
8
Polarity
protection
Internal
pull up
resistors
Input level
set
In
9
overload
detect
Digital to analogue
conversion
Output level
set Power Amp
BCD
DSP level select
Xtal
Clock generator
DSP core
5V
5V
Regulator
Latch
12V
regulator
3.3V
regulator
3.3V 12V Relay
Drive
Relay 1
ON
14
Analogue to
Digital conversion
7
0V
10
12
6
Power supply
section
PCB
Connections
13
5
J3
Input
Load
resistor
Agnd
Agnd
Vin
NC
NO
NO
NC
DSP
3V3 0V
PCB
microcontroller 4
Keyboard
interface
8
N/C
N/C
Relay 1 Out
11
2.1 Block diagram.
2. Module description.
Page 31
Figure 30. bhi label.
5. Applications.
5.3 bhi Label.
Supplied with the module is a square bhi label. Fix the
label on the top of the speaker enclosure as shown.
bhibhi
bhibhi
bhi
DSP
Noise
Cancellation