nedsp1062kbd

NEDSP1062-KBD Operating Manual

bhibhibhibhibhiNEDSP1062 KBD

Amplified Noise Eliminating DSP Module

Installation and Operating Manual

Sou

nd E

ngin

eerin

g S

olut

ions

from

bhi

1062-107DIssue D


Copyright

This publication, including all photographs andillustrations is protected under internationalcopyright laws, with all rights reserved. Neitherthis manual, nor any of the material within, maybe copied or reproduced without the writtenconsent of bhi Ltd.

Disclaimer

The information in this document is subject tochange without notice. bhi Ltd. makes norepresentations or warranties with respect to thecontents hereof and specifically disclaims anyimplied warranties of merchantability or fitness forany particular purpose. Furthermore, bhi Ltd.reserves the right to revise this publication and tomake changes from time to time in the contenthereof without obligation of bhi Ltd. to notify anyperson of such revision or changes.

Important Information


1. Introduction1.1 NEDSP1062-KBD features 51.2 Limitations 51.3 Module connection and mounting 61.4 Keyboard mounting 71.5 Sounder mounting 81.6 DSP noise cancellation 9

2. Module description2.1 Block diagram 102.2 Module layout 112.3 Pin functions 112.4 Controls 12

2.4.1 PCB controls 122.4.2 Keyboard 12

2.5 Electrical characteristics 12

3. Installation3.1 Installation overview 163.2 Module setup 17

3.2.1 Overview 173.2.2 Suggested set up procedure 173.2.3 Changes to output load 183.2.4 Other signal considerations 18

3.3 Driving the module from a low level signal 19

4. Functions4.1 Keyboard 20

4.1.1 Power button 204.1.2 DSP level button 20

4.2 Set up 214.3 Demonstration modes 234.4 Noise cancellation levels 24

5. Application notes5.1 Yaesu SP8 255.2 Kenwood SP31 285.3 bhi label 31

Contents


6. Physical dimensions6.1 Physical dimensions 326.2 Keyboard hole drilling detail 35

7. TroubleshootingTroubleshooting 37

8. Other bhi productsOther bhi products 38


1. Introduction.The NEDSP1061-KBD is a modular solution for noisereduction. It incorporates Digital Signal Processing (DSP)technology to provide up to 35dB of noise cancellationand 65dB of tone reduction. The module features an onboard power amplifier to allow it to be easily incorporatedin to existing equipment by installing the module in linewith the loudspeaker. All functions of the module arecontrolled by an easy to use keyboard.

1.1 NEDSP1062-KBD module features:

Fully adaptive noise cancellation up to 35dBInput and output level controlsInput level over load indicationVirtually no distortion to speech signalEasy to install4/8 levels of noise reduction (selectable)Frequency response 50Hz - 4.3KHz3 Watts output (4W)Single button operation of DSP mode with LED andaudible indication12 - 18V supply range27dB on board gainPower on/off - bypass pushbuttonSmall size 37 x 50mm (DSP pcb)Audio bypassed when power disconnectedSupplied with fixing and wiring kit and all labels

1.2 Limitations.This module is designed to pass speech. Other signalssuch as data, music and morse (CW) will to some degreepass through, but the integrity of these signalscannot be guaranteed. 1.

Intr

od

uct

ion

.


Figure 1. Mounting options

1.3 Module connection and mounting

The module is supplied with a pre-wired 2.1mm powerconnector. The centre pin is positive. The audio in andout are pre-wired pairs of wires, ready to be connectedin the audio path. The heatsink doubles up as a mountingbracket.

This module is designed to be driven from a high levelsignal, capable of driving a load of 22W.(The module can be easily modified to be driven from alow power signal, see section 3.3 for more information).

The module can be mountedusing the supplied self adhesivefoam pad. Ensure that none ofthe circuit pins can make contactwith any metallic parts.

For improved heat dissipationand a more rigid mechanicalfixing the heatsink can bereversed and used as a bracket.Note that the heatsink is at 0Vpotential and therefore may have

to be electrically insulated from any other metallic parts.

Alternatively the module has fourfixing holes which allow it to befixed to pillars.(See section 6 for hole detailsand physical dimensions).

1.In

tro

du

ctio

n. Using the heatsink

as bracket

Self adhesivepad

Mounting usingPCB pillars


1.In

tro

du

ctio

n.

If the installation has limitedspace, and is housed in a metalenclosure, the heatsink can beremoved, and the modulemounted directly on the chassis.The voltage regulator needs to becorrectly insulated as the tab isconnected to 0V. Insulate boththe regulator and mountingscrew. For improved heatdissipation use a suitable thermalpaste between the power devicesand the mounting.

Figure 2.Direct mounting.

Figure 3. Keyboard mounting 1.

The keyboard ismounted through theenclosure to providean easy to useinterface. Themodule is suppliedwith a label to placeover the keyboard.

When the enclosure is thick enough the keyboard isretained using a countersunk screw (supplied), which ishidden by the label, see figure 3 above. Do not overtighten the mounting screw.

keyboard

Front panellabel

Retainingscrew

Frontpanel

Insulator

Insulator

VoltageRegulator

1.4 Keyboard mounting.

(not supplied)

(not supplied)


Figure 4.Keyboard mounting 2.

If the enclosure is toothin to incorporate acountersunk screw(such as fitting intosheet metal) then it canbe retained by ainstrument headscrew.The label needs to becut out to allow thescrew to pass throughfrom the outside. Thiscan be easily achievedby applying the label tothe panel, then carefully cutting around the screw hole,with a sharp knife. Again do not over tighten the screw.

Nut &washer

Front panellabel

keyboard

Retainingscrew

Frontpanel

1.5 Sounder mounting.

Cut a small piece of theself adhesive foam(supplied) to mount thesounder.Do not cover the smallhole in the face of thesounder.For best results mountthe sounder where itcan radiate sound tothe outside the case,for example on an airvent.

Figure 5. Sounder mounting

SounderBacking paper

Backingpaper

Self adhesivefoam

Case

Keep thishole clear

Cut holefor screw

1.In

tro

du

ctio

n.


1.6 DSP Noise cancellation.

The bhi DSP processes the incoming signal and thendifferentiates the speech from the noise. The unwantednoise and interference is then attenuated to leave onlythe speech. The following diagrams are taken from actualaudio signals and illustrate how the signal is beingprocessed.

Figure 6. Noise cancellation.

Original signal.Speech with a lot ofbackground noise

Processed speech.Speech with reduced

noise

Speech Noise Reduced noise

1.In

tro

du

ctio

n.


2. Module description.

Figure 7. NEDSP1062-KBD block diagram

1

3

8

Polarityprotection

Internalpull up

resistors

Input levelset

In 9

overloaddetect

Digital to analogueconversion

Output levelset

Pow er Amp

BCD DSP level select

Xtal

Clock generator

DSP core

5V5VRegulator

Latch

12V regulator

3.3V regulator

3.3V 12VRelayDrive

Relay 1

ON 14

Analogue to Digital conversion

70V

10

12

6

Power supplysection

PCBConnections

13

5

J3

InputLoad

resistor

Agnd

Agnd

Vin

NC

NO

NO

NCDSP

3V3 0V

PCB

microcontroller 4Keyboardinterface

8

N/C

N/C

Relay 1 Out

11

2.1 Block diagram.

2.M

od

ule

des

crip

tion

.


2.2 Module Layout.

The following diagram shows the layout of theNEDSP1062-KBD module.

Pin No. Name Description Notes

4 N/C Do not connect Not used

5 Vin Supply voltage 12 - 18VDC power in

6 N/C Do not connect Not used

7 0V 0V connection 0V power connections

9 In Audio input Audio signal in to be processed

10 Out Audio output Procesed audio signal out

11 Agnd 0V for input audio signal Analogue ground for audio in

12 Agnd 0V for output audio signal Analogue ground for audio out

Table 1. NEDSP1062 connection functions 2.M

od

ule

des

crip

tio

n.

Figure 8. NEDSP1062-KBD connections and controls

Inputlevel set

(P2)

Outputlevel set (P1)

Input overloadindicator LED

Mountingholes

Audiobypassrelay

The following table gives a description of the pin functions.

Note:Wiring obmitted for clarity

Soundervolume (P3)

2.3 Pin functions.


2.4 Controls.

2.4.1PCB.The level controls provide adjustment for the audio levelsentering and leaving the module. The modules are factoryset to the maximum level.

Turning the potentiometers clock wise will decrease thelevels. These potentiometers do not have end stops, soit is possible to set them in a position where the audiowill be lost.

Audible indication of operation is provided by an piezosounder. The volume of this sounder can be varied bypotentiometer P3. The sounder volume is independentof the incoming audio volume.

2.4.2Keyboard.

The keyboard controls all of the module functionsincluding power on/off.

2.M

od

ule

des

crip

tion

.

Figure 9. NEDSP1062-KBD keyboard.

Power button(power and

Audio bypass)

DSPlevel

button

Tri colourLED

Mounting hole


2.5 Electrical characteristics.

Symbol Parameter Test Conditions Min. Typ. Max. Units

Vs Supply voltage 12 16 18 V

Iqs Quiescent currentVs = 12VVs = 16VVs = 18V

4.66.87.1

mA

IqonQuiescent current DSP onno load no signal

Vs = 12VVs = 16VVs = 18V

143160161

mA

ELECTRICAL CHARACTERISTICS(Vs=16V, Tamb= 25iiiiiC unless otherwise stated)

DC CHARACTERISTICS

AC CHARACTERISTICSSymbol Parameter Test Conditions Min. Typ. Max. Units

Po Output power

d = 10%f = 1KHz

RL = 8WRL = 4W

12V

1.161.7

16V 18V

2.063.17

Vs

WW

Vi

Input sensitivty4W load

f = 1KHzPO = 0.5WPO = 1.0WPO = 2.0W

6090

130

mV

ViInput sensitivty8W load

f = 1KHzPO = 0.5WPO = 1.0WPO = 2.0W

81117180

mV

B Frequency response(-3dB)

Po = 1WRL = 8W

50 4300 Hz

d Distortionf = 1KHzPO = 0.2 - 2.4W R L= 8WPO = 0.2 - 2.4W R L= 4W

0.80.8

%

Ri Input resistance 21 22 23 W

Gv Voltage gain f = 1KHz 27 dB

n Efficiencyf = 1KHzPO = 3W R L = 4WPO = 2W R L = 8W

3338

%

ANALOGUE CHARACTERISTICSSymbol Parameter Test Conditions Min Typ Max. Units

Td System delay 26 mS

2.M

od

ule

des

crip

tion

.

Table 2. Electrical characteristics 1


-20

-15

-10

-5

0

5

0 1000 2000 3000 4000 5000 6000

Figure 10. Frequency response

Frequency (Hz)

Out

put (

dB)

0

2

4

6

8

10

12

0 0.5 1 1.5 2 2.5 3 3.5

Figure 11. Distortion vs. Output power

Dis

torti

on

Output power (W)

VS = 16Vf = 1KHz RL = 8W

RL = 4W

2.M

od

ule

des

crip

tion

.

RL = 8W

VS = 16V

P = 1W

-3dB


Figure 12. Sensitivity.

0

0.5

1

1.5

2

2.5

0 50 100 150 200Input voltage (mV)

Out

put p

ower

(W)

RL = 8W

RL = 4W

VS = 16Vf = 1KHz

2.M

od

ule

des

crip

tion

.


Figure 13. Basic connection diagram

3.1 Installation overview.

The NEDSP1062-KBD module is inserted into the pathof noisy audio. The input and output level controls allowthe module to be fine tuned to suit most applications.

3. Installation

Audio in

Power amp

+

-

Break Circuithere

Audio Out(Loudspeaker)

The input to the module is loaded at 22W to provide adummy load to the preceding circuit. This can be removedif required, such as using the module in applicationswhere the audio source is provided by a low level, lowpower signal source. More information on this can befound in section 3.3 in this operating manual.

If Vin is less than approx. 13.8V ensure the power supplyis well decoupled otherwise the power supply rejectionratio will deteriorate. Best results are obtained in therange of 13.8V - 16Vdc.

Audio in

NEDSP1062Power amp

+

-

IN

Agnd Agnd

OUT

Keyboard

Power

10

12

9

11 Black

Piezosounder

BlueRed

Black

3.In

stal

lati

on

.


3.2 Module setup.

3.In

stal

lati

on

.3.2.2 Suggested set up procedure:

Basic setup procedure.Connect input source and output device.Ensure the NEDSP1062-KBD is switched off.Set the audio source to a typical audio level.Switch on the NEDSP1062-KBD.Adjust the input control (P2) until the overload LEDilluminates. Reduce the level by approx. 1/4 turn.Adjust the output level to the desired level.Hold down the DSP button and adjust the volume

of the sounder to suit using P3.

To obtain the best results from the noise reduction themodule should be set up to give optimum performance.The input sensitivity control has a range of 0.70mW -3W to provide 2W (W)output.

Under certain conditions, RF breakthrough cansometimes occur. To minimize this, the input level (P2)may need to be reduced or go to the FAQ page on thebhi website and download the FAQ on RF breakthrough.

Under certain conditions the DSP can create a smallamount of noise, normally when the unit has no signalapplied. You should not be able to hear this noise whena signal is applied.

Both the input and output levels are adjustable on themodule. This allows easy integration into the target system.

3.2.1 Overview.


The NEDSP1062-KBD requires a signal of 125mV rmsor greater for optimum performance. Signals lower thanthis may be used but the noise cancellation performancewill decrease, as the signal levels drops. If the unit isused with low level signals such as microphones, thesignal will need amplifying before applying it to theNEDSP1062-KBD.Due to the adaptive nature of the noise cancellation asmall delay may be heard when the audio signalchanges. For optimum performance provide the modulewith a constant signal where possible.

When switching on the unit a thump may be heard in theloudspeaker.3.

Inst

alla

tio

n.

Figure 14. Input circuit -module powered down

22W

OUT

12Agnd

Agnd

9

10

V

AudioInput

NEDSP1062

R6

IN

Load

11

The audio input to themodule is loaded at22W. This load iseffectively connectedacross the output loadwhen the unit isswitched off(bypassed).This will reduce theimpedance presentedto the audio source.

For example:8W will reduce to 5.9W4W will reduce to 3.4W

3.2.3Change to output load.

3.2.4Other signal considerations.


Figure 16. Circuit modification for low power signal drive.

3.3 Driving from a low signal source.

The input to the module has a low impedance. This is toprovide correct loading to any power circuits driving it. Ifthe module needs to be driven from a low power signalthen it must be modified in the following manner.

Cut theleg on this

resistor

3.In

stal

lati

on

.

22W

OUT

12Agnd

Agnd

9

10

LoadV

AudioInput

NEDSP1062

R6

IN

11

Circuitmodification

Figure 15. Physical modification for low power signaldrive.

Note:Wiring

omitted forclarity.


4. Operation.

4.O

per

atio

n.

4.1 Keyboard.The keyboard has 2 buttons and a tricolour LED.

4.1.1Power button.The power button switched the module on and off. Whenthe module is off, the audio bypasses the module, sothe circuit will behave as if the module isn’t present.Switching the power on routes the audio through themodule.

Note: If the power is on and the DSP is switched off, theaudio still passes through the DSP - but without any signalprocessing.A single press on the button switches on, and a singlepress will switch off. Also with the power connected andthe module switched off the circuit will still draw 6mA.

4.1.2DSP level button.This button is used to set the following:• DSP on/off• DSP level• 4 or 8 levels of noise cancellation• Demonstration modes

Figure 17. NEDSP1062-KBD keyboard.

Power button(power and

Audio bypass)

DSPlevel

button

Tri colourLED


Power up

DSP buttonpressed

2 tone sound

DSP buttonpressed

2 tone sound

2 tone sound

Demonstration2

Demonstration1

No

Yes

No

Yes

No

Yes

DSP buttonpressed

DSP buttonpressed

2 tone sound

DSP buttonpressed

Change 4 or 8 lev els

Normal operation

No

Yes beep numberof DSP lev els

Yes No DSP button

pressed

Yes

No

4.O

per

atio

n.

4.2 Set up.The following flow chart shows the functions of the DSPbutton.

Releasing the DSP buttonat this point the modulegoes in to demonstrationmode 1

Keep the button downuntil the desired levelhas been reached, thenrelease the button. Themodule will continouslyscroll through 4 and 8levels until the button isreleased.

Figure 18. 4/8 level setting.

Holding down the DSPbutton when switching oncauses the module to enterthe set up mode.

This is indicated by a 2tone beep.

Releasing the DSP buttonat this point the modulegoes in to demonstrationmode 2


4.O

per

atio

n.

To listen to the demonstration modes, or change thenumber of DSP levels it is necessary to put the moduleinto the set up mode.

To do this, ensure the module is Off. Press and hold theDSP level button. Turn on the module and a 2 tonebeep will be heard indicating that the module is in theset up mode.

Releasing the button after the first 2 tone beep will enterdemonstration mode 1.

Releasing after the second 2 tone beep will enterdemonstration mode 2.

Keeping the button depressed with change the numberof levels available. 4 beeps will indicate 4 level modeand 8 beeps 8 levels. Release the button when thedesired level is reached.

The module will return to normal operation after this.The colour of the LED will indicate the mode of operation.

DSP mode 4 Levels 8 Levels

OFF RED ORANGE

ON GREEN GREEN

Table 3. LED mode indication.


4.O

per

atio

n.

Start

Noise cancellationOn

Wait 1.5 Seconds

Noise cancellation of f

HighestLev el?

Normal operation

No

Yes

Increase DSPnoise cancellation

lev el

Start

Noise cancellation of f

Noise cancellationOn

Wait 3 Seconds

No

Yes

DSP buttonpressed?

2 tone beep

Normal operation

Wait 3 Seconds

Demonstration 2.The module switchesthe noise cancellationon for 3 seconds thenoff for 3 seconds. Thisis a good demonstra-tion of the before andafter effects of remov-ing the noise.

Demonstration 1.The module switches thenoise cancellation on for 1.5seconds, then off for 1.5seconds. It will then move tothe next level and repeat theprocess.This mode is particularlyeffective at demonstrating thedifferent DSP levels.Alternatively pass a cleanaudio signal through themodule to see hear how littlethe DSP alters the speech.

Note:To exit the demonstra-tion modes hold downthe DSP button until a2 tone beep is heard.

Figure 19.Demonstrationmodes.

4.3 Demonstration modes.


4.O

per

atio

n.

4.4 Noise reduction levels.

4 or 8 levels of noise reduction are available. The amountof noise and tone reduction is shown in the table below.

Level(4)

Level(8) Tone Reduction White Noise Reduction

1 4dB 9dB

1 2 5dB 11dB

3 6dB 13dB

2 4 8dB 15dB

5 16dB 17dB

3 6 21dB 20dB

7 25dB 24dB

4 8 65dB 35dB

Table 4. Tone and noise reduction levels.

The column marked level (4) shows the noise and tonereduction when operating the module with 4 levels, andthe level (8) column for 8 levels.

Holding down the DSP select button will continuouslychange the DSP level. When the desired level has beenreached, release the button. The module will retain thislevel until it is changed.


5. Application Notes.

5.A

pp

licat

ion

s.

This section provides information into installing theNEDSP1062-KBD into Amateur radio speaker units.

Figure 20. NEDSP1062-KBDinstalled in a Yaesu SP8.

5.1 Yaesu SP8.This section describesthe general fitting ofthe NEDSP1062-KBDmodule in the YaesuSP8 loudspeaker. Thisinstallation retains theoperation of theinternal filters.

DSPKeyboard

Figure 21. Suggested location ofpower connector

Figure 22. Suggested locationof keyboard.

This photographshows thesuggested locationfor mounting thekeyboard.

Suggested location formounting the powerconnector


Figure 23. Circuit diagram of installation in Yaesu SP8.5.A

pp

licat

ion

s.

NED

SP10

62Fi

lter

unit

Switc

hun

itPh

one

jack

uni

t

12

Blac

k

Red

122 1

Keyb

oard

conn

ecto

r

Blac

kBl

ack

9 111210

Con

nect

ions

to

mod

ule

JP20

02JP

3001

Red

Blue

The

NED

SP10

62 m

odul

e in

this

app

licat

ion

is in

serte

d be

twee

n th

e fil

ter u

nit a

nd th

eph

one

jack

uni

t. Lo

cate

the

2 w

ire c

onne

ctor

on

the

switc

h un

it (J

P20

02).

Bre

ak th

e w

ireto

pin

1 a

nd w

ire a

s sh

own

in th

e di

agra

m. I

nsul

ate

the

conn

ectio

n w

ith th

e su

pplie

dru

bber

sle

eve.

Bre

ak th

e w

ire o

n pi

n 2

on J

P20

02 a

nd c

onne

ct a

s sh

own

in th

e di

agra

man

d ag

ain

insu

late

with

a ru

bber

sle

eve.

The

fitti

ng k

it in

clud

es c

able

ties

to ti

dy u

p th

ew

iring

of t

he in

stal

latio

n. T

he p

hoto

grap

h on

the

next

pag

e sh

ows

the

com

plet

e in

stal

latio

n.M

ount

the

key

boar

d an

d po

wer

con

nect

or a

s sh

own

else

whe

re in

thi

s m

anua

l. Th

esq

uare

bhi

labe

l can

be

fitte

d to

the

top

of th

e ca

se.


Figure 24. Complete installation in the Yaesu SP8.

DSPmodule

InputPCB

Powerconnector

5.A

pp

licat

ion

s.


5.A

pp

licat

ion

s.

DSPKeyboard

5.2 Kenwood SP31.

Figure 25. NEDSP1062-KBD installed in a KenwoodSP31.

This sectiondescribes the generalfitting of theNEDSP1062-KBDmodule in theKenwood SP31loudspeaker. Thisinstallation retains theoperation of theinternal filters.

Figure 26. Suggestedlocation of keyboard.

Figure 27. Suggestedlocation of powerconnector.

Suggested location formounting the powerconnector

This photographshows thesuggested locationfor mounting thekeyboard.


5.A

pp

licat

ion

s.

NE

DS

P10

62

Line

out

Inpu

tS

elec

tor

Inpu

tP

CB

Pow

er

Red

Whi

te

Bla

ck

Bro

wn

0V

Hea

dpho

nes

Filte

rB

lue

Bla

ck0V

Line

out

Key

boar

d

Yel

low

Yel

low

43

125

12

3

12

21

43

Bla

ckB

lack

9 11

10 12

Con

nect

ions

to

mod

ule

Bla

ck

Red

Blu

eR

ed

Figure 28. Circuit diagram of installation in KenwoodSP31.

The

mod

ule

is in

serte

d in

to th

e ci

rcui

t bef

ore

the

filte

r PC

B. I

dent

ify th

e ye

llow

wire

conn

ectin

g th

e in

put s

elec

tor s

witc

h to

the

filte

r boa

rd. B

reak

the

wire

and

con

nect

the

NED

SP10

62-K

BD

as

show

n be

low

. Ins

ulat

e th

e w

ires

with

the

supp

lied

rubb

ersl

eeve

s. Id

entif

y th

e bl

ack

wire

from

the

inpu

t PC

B a

nd c

onne

ct a

s sh

own

belo

w,ag

ain

insu

latin

g th

e co

nnec

tions

. Th

e fit

ting

kit

incl

udes

cab

le t

ies

to t

idy

up t

hew

iring

of

the

inst

alla

tion.

The

pho

togr

aph

on t

he n

ext

page

sho

ws

the

com

plet

ein

stal

latio

n. M

ount

the

keyb

oard

and

pow

er c

onne

ctor

as

show

n el

sew

here

in th

ism

anua

l. Th

e sq

uare

bhi

labe

l can

be

fitte

d to

the

top

of th

e ca

se.


Figure 29. Photograph of complete installation.

Sounder

NEDSP module(screwed to the case,using an existing hole)

Inputselectorswitch

FilterPCB

DSPconnections

Keyboard

5.A

pp

licat

ion

s.


Figure 30. bhi label.

5.A

pp

licat

ion

s.

5.3 bhi Label.

Supplied with the module is a square bhi label. Fix thelabel on the top of the speaker enclosure as shown.

bhibhibhibhibhiDSP

NoiseCancellation


23.4

2.97

30.3

34.3

36.5

49.6

2.97 Pin 1

3mm dia

6.P

hys

ical

dim

ensi

on

s.

6. Physical Dimensions

Figure 31. Mounting hole positions.

Top

6.1 Physical dimensions.The following diagrams detail the physical dimensionsof the module. All dimensions are in mm.


6.P

hys

ical

dim

ensi

on

s.Components fitted torear of PCB

Figure 32. Overall dimensions.

Figure 33. Hole dimensions of power devices - for directmounting applications.

16.1

5.3

17.9

16.4

Viewed fromthe end ofthe module

34.2

64.4

5.8


6.P

hys

ical

dim

ensi

on

s.

Figure 34. Keyboard dimensions.

Figure 35. Power connector hole size.

29.825.3

20.213.4

6.89.5

4.7

7.53.

2

10.9

5.5

3

8mm diameter


6.P

hys

ical

dim

ensi

on

s.

6.2 Template.

The following drawing shows the sizes and positions ofholes for the keyboard.

Figure 36. Keyboard drilling detail .

Not to scaleall dimensions in mm

29.818.5

13.4

6.7

6.7

10.9 5.

54mm

4mm 4mm

3mm CSKto 5mm


Star

t

Incr

ease

inpu

tle

vel

Ove

r loa

d LE

Dillu

min

ates

? N

o

Yes

Redu

ce in

put

so L

ED g

oes

out

Incr

ease

out

put

leve

l P1

Suff

icie

ntou

tput

vol

ume?

Supp

ly v

olta

ge<1

3.8

Vdc

Inpu

t lev

elto

o lo

w

Incr

ease

supp

lyvo

ltage

Fini

sh Yes

Disc

onne

ctR6

(see

sec

tion

3.3)

Ove

r loa

d LE

Dillu

min

ates

?

Add

add

itiona

lam

plifi

catio

n

No

Yes

No

No

Yes

7.2

Insu

ffuci

ent o

utpu

tvo

lum

e 7. Troubleshooting

Inpu

tsi

gnal

Ove

rload

LE

D on

Redu

ce in

put

leve

l

Incr

ease

ou

tput

leve

lP1

App

lyau

dio

sign

al

Incr

ease

inpu

tsi

gnal

P2

No

Yes

No

Yes

Aud

io

out?

Fini

sh

Star

t

Yes

No

7.1

No

audi

o ou

t

7.Tr

ou

ble

sho

oti

ng

.


8. Other bhi productsOther noise cancellation products from bhi. Visit www.bhi-ltd.co.ukfor more information.

DSP noise cancellation built into a compactspeaker unit. the unit provides an easy toinstall 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• 12-24VDC operation• 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 cancellingspeaker preset to 20dB of noisereduction.

Features:• Fully adaptive noise cancellation 20dB• 12-24VDC operation• 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.O

ther

bh

i pro

du

cts.


8.3 NEIM1031 In-line module.Then NEIM1031 provides a flexible solution to noise reduction. Itfeatures both amplified inputs and outputs, along with line level sig-nal processing. The unit also features an audio bypass when theunit is switched off, so there is no need to disconnect when not inuse.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.

LSPKR20 Watt extension speakerfor use with the NEIM1031.Fitted with a 3.5mm monojack plug.

1031-STAMounting stand for the NEIM1031.Allows the NEIM1031 to be ad-justed for the most comfortableoperating postion.

8.O

ther

bh

i pro

du

cts.

DSP module range.NEDSP1061: Low signal level moduleNEDSP1062 - KBD: Low signal level module

controlled by single buttonkeyboard.

NEDSP1062 - KBD: Amplified DSP modulecontrolled by a 2 buttonkeyboard.

1030-UKPA UK DC power adapter1030-EUPA European DC power adapter


bhi LtdP.O. Box 318Burgess Hill

West SussexRH15 9NR

tel: +44 (0)845 2179926fax: +44 (0)845 2179936

[email protected]

bhibhibhibhibhi

DSP

Noi

se C

ance

llatio

n Pr

oduc

ts

DSP Noise Cancellation

nedsp1062kbd

Documents

Transcript of nedsp1062kbd