BHI NEDSP1061-PCB Manual de usuario

Page 1

bhibhi

bhi

NEDSP1061-PCB

Noise Eliminating Modules

Installation and Operating Manual

1061-108D

Issue C

DSPNoiseCancellingProducts

Page 24

bhi ltd

PO Box 318

Burgess Hill

West Sussex

RH159NR

tel: +44 (0)845 217 9926

fax: +44 (0)845 217 9936

[email protected]

www.bhi-ltd.com

bhibhi

bhi

DSP Noise Cancelling Products

Page 2

Important Information

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.

Page 23

Notes:

Page 3

Contents

1. Introduction

1.1 NEDSP1061 features 4

1.2 Limitations 4

1.3 Module connection and mounting 5

1.4 DSP noise cancellation 6

2. Module description

2.1 Block diagram 7

2.2 Module layout 8

2.3 Pin functions 9

2.4 Controls 10

2.5 Electrical characteristics 10

3. Installation 11

4. Functions

4.1 Noise reduction levels 13

4.2 Pre-setting different DSP levels 13

4.3 Remote setting of DSP level 14

4.4 Noise cancellation on/off 15

5. Application notes

5.1 Noise cancellation indication 16

5.2 Remote adjustment of level 17

5.3 Driving a low impedance load 19

5.4 Audio bypass 19

Index 20

Page 22

Notes:

Page 4

1. Introduction

TheNEDSP1061isamodularsolution to noisereduction.

It incorporates DSP technology to provide up to 35dB of

noise cancellation.

1.1 NEDSP1061 module features:

Fully adaptive to changing noise environments

Input and output level controls

Virtually no distortion to speech signal

Up to 35dB of noise cancellation

8 levels of noise reduction

Noise cancellation can be preset or remotely set

during operation

5 – 15V supply range

4.6dB on board gain

Wide range of connection possibilities

Mounting holes

1.2 Limitations.

This module is designed to pass speech. Other signals

suchasdata,music and morse (CW) will tosome degree

pass through, but the integrity of these signals

cannot be guaranteed.

Thismoduleisdesignedtobeplacedin a low level audio

path only. The module will not drive a loudspeaker or

other high power load.

Page 21

Notes:

Page 5

Plug in Vertically

Plug in Horizontally

Horizontal connector

Figure 1. Connection options

1.3 Module connection and mounting

Connections to the module are made by a row of 10

pads at the right hand side of the PCB. These pads are

on a 2.54mm (0.1”) pitch, which allows the use of

standardpinheaders,PCBconnectorsanddirectwiring.

Vertical mounting.

Use a 10 way 0.1” pitch right

angled pin header in the PCB

(J2). The module can then plug

into a suitable mating connector,

or be soldered directly to the

target system.

Horizontal mounting.

Use a 10 way 0.1” pitch straight

pin header in PCB (J2). Mount a

4 way header in the PCB (J1).

Do not connect these pins to the

circuit, use them purely for

mechanical fixing.

Other options.

Use a right angled pin header to

mate with a 10 way wired

connector.

Wire the PCB directly and mount

using the four fixing holes.

Page 20

Index

Application Notes 16

Audio bypass 19

Audio input. 9

Audio out 9

Buffered output stage 19

Disclaimer 2

Driving a low impedance load 19

DSP filter level set 9

Electrical characeristics 10

Important Information 2

inhibit noise cancellation, 15

microcontroller. 18

Noise Cancellation On/Off 15

Noise cancellation on/off 9

Noise cancellation On/Off indication 16

Noise reduction levels 13

noisy audio 11

Remote adjustment of noise cancellation level. 17

Remote setting of DSP filter level 14

Remote setting of the DSP 14

safety critical 19

Setting different filter levels 13

Supply voltage 9

tricolour LED 16

Page 6

1.4 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

the speech.

The following diagrams are taken from actual audio

signals and illustrate how the signal is being processed.

Figure 1. Noise cancellation.

Original signal.

Speech with a lot of

background noise

Processed speech.

Speech with reduced

noise

Speech Noise

Reduced noise

Page 19

NEDSP 1061

Audio out 10

0V 7

10K

Buffered

Audio out

Bias to 1/2

off supply voltage

or use dual polarity

power supply

Figure 12. Buffered output stage.

5.3 Driving a low impedance load.

If the target system loads the output of the DSP module

it may necessary to buffer the output. This can be

achieved with a single op amp.

NEDSP 1061

Audio out

Audio In

+V 5

Audio out

Audio in

Relay

Contacts

Power

off/bypass

switch

Vin

Relay

Coil Protection

Diode

Figure 13. Audio bypass.

5.4 Audio Bypass.

Insafetycritical applications a bypass should beincluded

to maintain communications in the unlikely event of the

NEDSP1061 or the power failing. The following circuit

uses a relay to route the audio signal. In the even of

power failure to the module the relay will de-energise

and connect the input to output. Also shown is a switch

to bypass the module manually.

Page 7

2. Module description

Figure 2. NEDSP1061 block diagram

Output level

set

Input level

set

Analogue to

Digital conversion

Digital to analogue

conversion

BCD

DSP level select

Xtal

Clock generator

On Board

Jumpers

DSP core

3.3V

3.3V regulator Polarity

protection

PCB

Connections

Internal

pull up

resistors

Vin

Noff

Out

2.1 Block diagram.

The NESDP1061 module has the facility to be preset, or

adjusted during operation. Digital inputs control the

functions. These incorporate internal pull up resistors,

so they can be left floating when not in use.

Theaudio signals intoandoutof themodulearecapacitor

coupled.

The on board voltage regulator allows the module to be

used with a wide range of input voltages, but to keep the

power dissipation (and heat) down it is advisable to use

as low as possible supply voltage. The power supply

input is reverse polarity protected.

Page 18

NEDSP 1061

N0 1

N1 2

N2 3

0V 7

micro controller

Figure 10. Control using a microcontroller

The module can be controlled with a microcontroller.As

the DSP employs internal pull ups, it is not necessary to

drive the microcontroller port pins high, they can be

placed in a high impedance state.

NEDSP 1061

N0 1

N1 2

N2 3

micro controller

display

BCD to

7 segment

decoder

CD4511

Seven segment LED

display showing

DSP filter level

(note: displays 0 - 7)

Keyboard

Noff 8

Figure 11. Control using a microcontroller with display

and keyboard.

Thefollowingexampleemploysa7segmentdisplayand

keyboard. Noise on/off is also controlled by the

microcontroller. In the diagram 3 buttons are used, up

level, down level and DSP on/off.

Page 8

JP3

JP1

JP2

Connections

Do not

Connect

these

pins

Mounting

holes

(4 off)

Input

level

Output

level

Noise cancellation

level jumpers

Top

Figure 3. NEDSP1061 connections and controls

2.2 Module Layout.

The following diagram shows the layout of the

NEDSP1061 module.

.oNniP emaN noitpircseD

10NtibnoitallecnacesionbslDCB

21NtibnoitallecnacesionDCB

32NBSMnoitallecnacesionDCB

4C/Ntcennocto

noD

5niVegatlovylppuS

6C/NtcennoctonoD

7V0noitcennocV0

8ffoNnipffo/nonoitallecnacesioN

9nItupnioiduA

01 tuOtuptuoo

iduA

Table 1. NEDSP1061 connection functions

Page 17

5.2 Remote adjustment of noise cancellation

level.

NEDSP 1061

N0 1

N1 2

N2 3

0V 7

124

BCD

Complement

switch

This page illustrates various options for altering the DSP

level remotely, during operation.

Figure 8. Basic setting using a BCD switch

NEDSP 1061

N0 1

N1 2

N2 3

0V 7

124

Note:

Inputs

will be inverted

Figure 9. Basic setting using transistors

The transistors allow interfacing

withhighervoltagesto control the

DSP level. These could be

replaced by opto couplers for

greaterisolation.

Page 9

2.3 Pin functions.

The basic operation of the NEDSP pins are described

below. More detailed descriptions can be found later in

this manual.

Pins 1-3 DSP filter level set.

Thesepinsallowremotesettingof the noise cancellation

level. If these pins are used, then remove the preset

jumpers JP1 - JP3 from the PCB.

Pin 5. Supply voltage.

Supply voltage 5-15VDC

Pin 7 0V

0V pin.

Pin 8 Noise cancellation on/off

Connecting this pin to 0V inhibits the noise cancellation.

Leave this pin floating to enable noise cancellation.

Pin 9 Audio input.

Audio signal to be processed.

Pin 10 Audio out

DSP processed signal out from the module.

For optimum performance, keep all leads as short as

possible. Use screened leads for the audio signal.

Page 16

5. Application Notes.

5.1 Noise cancellation On/Off indication.

Figure7. Red/Green LEDindicationof noise cancellation.

In the above example a tricolour LED (or separate Red

and Green LEDs) are used to give a visual indication of

the noise cancellation mode. The green LED will

illuminate when the noise cancellation is on, and the red

when off.

NEDSP 1061

0V 7

Noff 8

Red Green

R1 R2

Noise

cancellation

Off

DPDT

switch

Page 10

2.4 Controls.

TheaudiolevelcontrolpotentiometersP1 (Audio out),

andP2(Audioin)provideadjustmenttotheaudiolevels

enteringandleaving the module.

P1isfactorysetneartomaximum.

Tosetthe input level correctly,adjustP2until the

overloadledD1(nexttoP2)illuminates,thenbackoff

thepotentiometerapproximatelya1/4 of a turn.

Turningthepotentiometersanticlockwisewill increase

thelevels.

scitsiretcarahCeugolanA

retemaraP noitpircseD niM pyT xaM stinU

egatlovylppuS5951V

tnerrucylppuS5405Am

nIlangistupnioiduA05003smrV

tuO langistuptuooiduA )xamtupnisX7.1( 036smrV

scitsiretcarahClatigiD

retemaraP noitpircseD niM pyT xaM stinU

hgiHni

ttimhcS(egatlovtupnIleveLhgiH )reggirt 3.3V

woLni

ttimcS(egatlovtupnIlevelwoL )reggirt 8.0V

hgiHnI

hgihtupni-tnerrucegakaeltupnI010306Au

woLI

woltupni-tnerrucegakaeltupnI01-03-06-Au

Table 2. NEDSP1061 Electrical characeristics

2.5 Electrical characteristics.

Page 15

leveL 2N 1N 0N

1V0V0V0

2V0V0V3.3

3V0V3.3V0

4V0V3.3V3.3

5V3.3V0V0

6V3.3V0V3.3

7V3.3V3.3V0

8V3.3V3.3V3.3

Note:

The DSP has internal pull ups on its inputs, so any cell

in the table containing 3.3V may be left open circuit.

When processing signals with high levels of noise and

high levels of noise cancellation, the signal may sound

slightly strange. This is quite normal with this type of

signal.

4.4 Noise Cancellation On/Off

The module has the provision for remotely enabling and

disabling the noise reduction, while in operation. The

default setting for the module is noise cancellation on.

Thismaybe switched by theuseofthenoise cancellation

on/off pin (PCB pin 8).

To inhibit noise cancellation, connect this pin to 0V.

To enable noise cancellation leave the pin unconnected.

Table 5. Remote DSP level setting.

Outputimpedance:Nominally 10k Ohms

Inputimpedance:7.5k Ohms typical

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