BHI NEDSP1062 KBD Manuel utilisateur

Page 1NEDSP1062-KBD Operating Manual

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

This publication, including all photographs and

illustrations is protected under international

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

Voltage

Regulator

1.4 Keyboard mounting.

(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

Polarity

protection

Internal

pull up

resistors

Input level

set

overload

detect

Digital to analogue

conversion

Output level

set Pow er

Amp

BCD

DSPlevel select

Xtal

Clock generator

DSP core

Regulator

Latch

12V

regulator

3.3V

regulator

3.3V 12V Relay

Drive

Relay 1

Analogue to

Digital conversion

Power supply

section

PCB

Connections

Input

Load

resistor

Agnd

Vin

DSP

3V3 0V

PCB

microcontroller 4

Keyboard

interface

N/C

Relay 1 Out

2.1 Block diagram.

2. Module description.

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