BHI NEDSP1062 KBD Manuale utente
Page 1NEDSP1062-KBD Operating Manual
bhibhi
bhibhi
bhi
NEDSP1062 KBD
Amplified Noise Eliminating DSP Module
Installation and Operating Manual
Sound Engineering Solutions from bhi
1062-107D
Issue D
Page 2 NEDSP1062-KBD Operating Manual
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 3NEDSP1062-KBD Operating Manual
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 Module layout 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 Installation overview 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 Kenwood SP31 28
5.3 bhi label 31
Contents
Page 4 NEDSP1062-KBD Operating Manual
6. Physical dimensions
6.1 Physical dimensions 32
6.2 Keyboard hole drilling detail 35
7. Troubleshooting
Troubleshooting 37
8. Other bhi products
Other bhi products 38
Page 5NEDSP1062-KBD Operating Manual
1. Introduction.
The NEDSP1061-KBD is a modular solution for noise
reduction.Itincorporates DigitalSignalProcessing(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,musicandmorse(CW)willtosomedegree
pass through, but the integrity of these signals
cannot be guaranteed.
1. Introduction.
Page 6 NEDSP1062-KBD Operating Manual
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
intheaudio path.Theheatsink doublesupas amounting
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 7NEDSP1062-KBD Operating Manual
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.
Thevoltageregulatorneedsto be
correctly insulated as the tab is
connected to 0V. Insulate both
the regulator and mounting
screw. For improved heat
dissipationuseasuitablethermal
pastebetween the powerdevices
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 8 NEDSP1062-KBD Operating Manual
Figure 4.
Keyboard mounting 2.
If the enclosure is too
thin to incorporate a
countersunk screw
(such as fitting into
sheetmetal)thenitcan
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 9NEDSP1062-KBD Operating Manual
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.Thefollowing diagramsaretakenfromactual
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 10 NEDSP1062-KBD Operating Manual
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 Pow er
Amp
BCD
DSPlevel 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.
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