NEDSP1062-KBD PDF operating manual
Contents
1. q Normal operation Demonstration 2 The module switches the noise cancellation on for 3 seconds then off for 3 seconds This S a good demonstra tion of the before and after effects of remov ing the noise Note To exit the demonstra tion modes hold down the DSP button until a 2 tone beep is heard Page 23 4 4 Noise reduction levels 4 or 8 levels of noise reduction are available The amount of noise and tone reduction is shown in the table below Tone Reduction White Noise Reduction 4dB 9dB SdB 11dB 6dB 13dB SdB 15dB 16dB 17dB 210B 200B lable 4 Tone and noise reduction levels The column marked level 4 shows the noise and tone reduction when operating the module with 4 levels and the level 8 column for 8 levels Holding down the DSP select button will continuously change the DSP level When the desired level has been reached release the button The module will retain this level until it is changed Page 24 5 Application Notes IS section provides information on installing the NEDSP1062 KBD into various extension speaker units Information on other speaker installs can be found at www bhi ltd com Amateur Radio Installs 5 1 Yaesu SP8 This section describes the general fitting of the NEDSP1062 KBD module in the Yaesu SP8 loudspeaker This installation retains the operation of the Keyboard internal filters y Figure 20 NEDS2. N em Voltage Regulator Insulator not supplied Figure 2 9 Direct mounting The keyboard mounted through the enclosure to provide an easy fo use The module is supplied with a label to place over the keyboard interface 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 The voltage regulator needs to be correctly insulated as the tab is connected to OV Insulate both the regulator and mounting screw For improved heat dissipation use a suitable thermal paste between the power devices and the mounting 1 4 Keyboard mounting keyboard Front panel label Retaining screw Figure 3 Keyboard mounting 1 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 Page 7 If the enclosure is too thin to incorporate a countersunk screw such as fitting into sheet metal then it can be retained by a Front panel label instrument head screw The label needs to be cut out to allow the Retaining Cut hole screw to pass through screw for screw from the outside This Figure 4 can be easily achieved keyboard mounting 2 by applying the label to the panel then carefully cutting around the screw hole with a sharp knife Again do not ove
3. Page 21 To listen to the demonstration modes or change the number of DSP levels it is necessary to put the module into the set up mode To do this ensure the module is Off Press and hold the DSP level button Turn on the module and a 2 tone beep will be heard indicating that the module is in the set up mode Releasing the button after the first 2 tone beep will enter demonstration mode 1 Releasing after the second 2 tone beep will enter demonstration mode 2 Keeping the button depressed with change the number of levels available 4 beeps will indicate 4 level mode and 8 beeps 8 levels Release the button when the desired 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 8 Levels OFF RED ORANGE GREEN GREEN Table 3 LED mode indication Page 22 4 3 Demonstration modes Figure 19 2 m bee modes Y Normal Demonstration 1 The module switches the noise cancellation on for 1 5 seconds then off for 1 5 seconds It will then move to the next level and repeat the process This mode is particularly effective at demonstrating the different DSP levels Alternatively pass a clean audio signal through the module to see hear how little the DSP alters the speech Demonstration
4. selector connections Keyboard switch Filter VY PE AI Sounder m NEDSP module screwed to the case using an existing hole Figure 29 Photograph of complete installation Page 30 NEDSP1062 KBD Operating Manual 5 3 bhi Label Supplied with the module is a sguare bhi label Fix the label on the top of the speaker enclosure as shown Figure 30 bhi label NEDSP1062 KBD Operating Manual Page 31 6 Physical Dimensions 6 1 Physical dimensions The following diagrams detail the physical dimensions of the module All dimensions are in mm 3mm dia 23 4 LI IMENSIONS LI Figure 31 Mounting hole positions 6 Physical di Page 32 64 4 Componenis fitted to rear of PCB Figure 32 Overall dimensions 16 1 Mm Viewed from _ 9 9 the end of the module 16 4 17 9 Figure 33 Hole dimensions of power devices for direct mounting applications Page 33 10 9 3 2 15 Figure 34 Keyboard dimensions 8mm diameter O Figure 35 Power connector hole size Page 34 6 2 Template The following drawing shows the sizes and positions of holes for the keyboard 3mm CSK to 5mm Amm 4mm 13 4 om 18 5 lt i b 29 8 l Not to scale all dimensions in mm Figure 36 Keyboard drilling detail lt Thi
5. Installation overview The NEDSP1062 KBD module is inserted into the path of noisy audio The input and output level controls allow the module to be fine tuned to suit most applications Audio in Audio Out Loudspeaker here Audio in Power Figure 13 Basic connection diagram The input to the module is loaded at 220 to provide a dummy load to the preceding circuit This can be removed if required such as using the module in applications where the audio source is provided by a low level low power signal source More information on this can be found in section 3 3 in this operating manual If V is less than approx 13 8V ensure the power supply is well decoupled otherwise the power supply rejection ratio will deteriorate Best results are obtained in the range of 13 8V 16Vdc Page 16 3 2 Module setup Both the input and output levels are adjustable on the module This allows easy integration into the target system 3 2 1 Overview To obtain the best results from the noise reduction the module should be set up to give optimum performance The input sensitivity control has a range of 0 70mW 3W to provide 2W Q output Under certain conditions RF breakthrough can sometimes occur To minimize this the input level P2 may need to be reduced or go to the FAQ page on the bhi website and download the FAQ on RF breakthrough Under certain conditions the DSP can create a small amount of noise normally wh
6. 5V Regulator Latch ON Figure 7 NEDSP1062 KBD block diagram Page 10 A Polarity Vin protection PCB L aT Relay Drive nn 2 2 Module Layout The following diagram shows the layout of the NEDSP1062 KBD module Note Input Wiring obmitted for clarity level set P2 OO 000000000000600 Audio L bypass aed Mounting relay holes O ig 332 sO 00002 O Sounder Input overload Output volume P3 indicator LED level set P1 Figure 8 NEDSP1062 KBD connections and controls 2 3 Pin functions The following table gives a description of the pin functions Pinno m ssn nm s no omo s vn Jerome nc sn m 0 o om tv irm aasossi oun orausoin 52 s m nv irox s ao si Taranaw gowa oraudook Table 1 NEDSP1062 connection functions Page 11 2 4 Controls 2 4 1 PCB The level controls provide adjustment for the audio levels entering and leaving the module The modules are factory set to the maximum level Turning the potentiometers clock wise will decrease the levels These potentiometers do not have end stops so It is possible to set them in a position where the audio will be lost Audible indication of operation is provide
7. P1062 KBD installed in a Yaesu SP8 Suggested location for mounting the power connector amp 1 wiar Figure 21 Suggested location of power connector This photograph shows the suggested location for mounting the keyboard Figure 22 Suggested location of keyboard NEDSP1062 KBD Operating Manual Page 25 5 Applications 0 Suol 99uuoo yorlg 002 yoeld_ yoeld_ yun yor Hun Hun uoud Yous EME Pad pieoqhey 4012 UUO SEO OY JO dO ey 0 ps eq ueo 10 9 SUL renuew siy Ul H UM S UMOUS SE 10 2 UUO pue pieogAay SU yuno UOIJEJIBISUI eu SAMOUS a6ed jxau y UO udeiuDo oud y uogeesu 3y JO Bum y dn p o s n ajqed s pnioul yy Bull v A S e UM ayejnsul urebe pue 3y UI UMOUS SE 99uuo2 pue 20024 UO Z uid UO y yeg ansajs Jaggni p rddns eu ullA UOIJSSULUOI v ajejnsuj weep 3y UI UMOUS SE pue 10 JIM AU YRS ZOOZdT HUN YOUMS y UO 10 99uuo2 SIM Z AU 218207 HUN yor uoud y pue Jun 1941 BY Usamjag p H SUL SI UolEolddE siy UI jnpow Z90LASGAN SUL Figure 23 Circuit diagram of installation in Yaesu SP8 Page 26 DSP module connector Figure 24 Complete installation in the Yaesu SP8 NEDSP1062 KBD Operating Manual Page 27 5 Applications 5 2 Kenvvoo
8. PKR Loud10 VVatt rms audio DSP noise cancelling speaker Features 7 DSP filter levels 9 24dB 12 18V DC operation Simple control of all functions sleep mode Filter store function Volume control Input level indicator Comes with 2m audio lead Fused DC power lead amp manual Page 38 NEDSP1062 KBD Operating Manual 8 3 NEIM1031 MK l In line module Then NEIM1031MKII 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 LSPKR 20 Watt extension speaker ANEM MKII for use with the NEIM1031 Compact in line DSP noise cancel Fitted with a 3 5mm mono ling module Simple control Use jack plug with Headphones or a speaker 8 filter levelsSupplied with ALD 001 8 5 DSP modules 1030 FPL and user manual DSP module range NEDSP1061 KBD Low signal level module controlled by single button keyboard NEDSP1062 KBD Amplified DSP module s controlled by a 2 button Ee key
9. bhi NEDSP1062 KBD Amplified Noise Eliminating DSP Module Installation and Operating Manual 1062 107D Issue E Important Information 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 implied warranties of merchantability or fitness for 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 Contents Introduction 1 1 NEDSP1062 KBD features 1 2 Limitations 1 3 Module connection and mounting 1 4 Keyboard mounting 1 5 Sounder mounting 1 6 DSP noise cancellation Module description 2 1 Block diagram 2 2 Module layout 2 3 Pin functions 2 4 Controls 2 4 1 PCB controls 2 4 2 Keyboard 2 5 Electrical characteristics Installation 3 1 Installation overview 3 2 Module setup 3 2 1 Overview 3 2 2 Suggested set up procedure 3 2 3 Changes to output load 3 2 4 Other signal considerations 3 3 Driving the module from a low level signal Functi
10. board h 1030 UKPA UK povver adapter 1030 EUPA European DC povver adapter NEDSP1062 KBD Operating Manual Page 39 Dhi bhi Ltd P O Box 318 Burgess Hill West Sussex RH15 9NR tel 44 0 1444 870333 sales bhi ltd com www bhi ltd com Page 40
11. d SP31 DSP This section describes the general fitting of the NEDSP1062 KBD module in the Kenvvood SP31 loudspeaker This installation retains the operation of the internal filters Figure 25 NEDSP1062 KBD installed in a Kenwood SP31 This photograph shovvs the suggested location for mounting the keyboard Figure 26 Suggested location of keyboard Suggested location for mounting the povver connector Figure 27 Suggested location of povver connector Page 28 NEDSP1062 KBD Operating Manual o Suoll99uuoo 110 au 1010 MUM 2 Omoa 17 indu pod pieoghey JOMOd eseg y JO dO ey 0 Pally eq uso q luq lenbs su SIU Ul M UM S UMOUS SE 10 2 UUO pue p eoq y y Juno uol j e sui alajdwoD y SMOUS abed ix u eyy UO ydes6ojoyd SU uolljjje1su 3y JO BULIM y dn Api o s n ajqeo s pnioul yy Bull Suono uuo y buyejnsui urebe MOl Q UMOUS SE 99uuo2 pue 404 Indul y WOI yOR G UI Aljuapj sanaajs Jaqqni p riddns ey y m ey lElnsul mojeg UMOUS SE 108 2901 4503 94 109UUO0D pue OU pipoq 19411 AYI 0 UDJIMS Jojoajas 11001 y Buydauuod H ey jllu pi gOd 19414 BY HNIJI9 BU OJUI p H sul SI 2INPOW y Figure 28 Circuit diagram of installation in Kenvvood SP31 Page 29 5 Applications Input DSP
12. d by an piezo sounder The volume of this sounder can be varied by potentiometer P3 The sounder volume is independent of the incoming audio volume 2 4 2 Keyboard The keyboard controls all of the module functions including power on off Mounting hole Tri colour LED Power button DSP power and level Audio bypass button Figure 9 NEDSP1062 KBD keyboard Page 12 2 5 Electrical characteristics ELECTRICAL CHARACTERISTICS V 16V T 25 C unless otherwise stated mb DC CHARACTERISTICS v suoyotage voltage nm Qulescent current DSP on Klan no load no signal AC CHARACTERISTICS Symbol Parameter 1 TesiConditons iin Typ Max m 12V 16V 18V Output povver R 2 06 R Input sensitivty 40 load o o 7 U l H N Input sensitivity 8 load 7 response re 1VV n Distortion P 0 2 24WR 80 P 0 2 2 4W R SAN O fooson ro Sel l s 1KHz Efficiency P 3W R 40 33 P 2W R 80 38 ANALOGUE CHARACTERISTICS o LO K S I SS Table 2 Electrical characteristics 1 Page 13 Figure 10 Frequency response _ Output dB 2 p o dd 2 a 1 5 2 Output power VV Page 14 NEDSP1062 KBD Operating Manual Figure 12 Sensitivity v 2 en en O Input voltage mV NEDSP1062 KBD Operating Manual Page 15 3 Installation 3 Installation 31
13. e module switched off the circuit will still draw 6mA 4 1 2 DSP level button This button is used to set the following DSP on off DSP level 4 or 8 levels of noise cancellation Demonstration modes Power button power and DSP Tri colour Audio bypass level LED d button Figure 17 NEDSP1062 KBD keyboard Page 20 4 2 Setup The follovving flovv chart shovvs the functions of the DSP button Holding down the DSP button when switching on causes the module to enter the set up mode This is indicated by a 2 tone beep Releasing the DSP button at this point the module goes in to demonstration mode 1 Releasing the DSP button at this point the module goes in to demonstration mode 2 Keep the button down until the desired level has been reached then release the button The module will continously scroll through 4 and 8 levels until the button is released beep number of DSP levels Y Change 4 or 8 levels DSP button DSP button No pressed Yes Y 2 tone sound DSP button pressed EES Yes Y 2 tone sound DSP button pressed ik Yes Y 2 tone sound DSP button pressed 2 tone sound DSP button pressed No pressed No mar Y Normal operation
14. en the unit has no signal applied You should not be able to hear this noise when a signal is applied 3 2 2 Suggested set up procedure Basic setup procedure m Connect input source and output device B Ensure the NEDSP1062 KBD is switched off m Set the audio source to a typical audio level mg Switch on the NEDSP1062 KBD m Adjust the input control P2 until the overload LED illuminates Reduce the level by approx 1 4 turn m Adjust the output level to the desired level Hold down the DSP button and adjust the volume of the sounder to suit using P3 Page 17 The audio input to the module is loaded at 221 This load is effectively connected across the output load when the unit is switched off bypassed This will reduce the impedance presented to the audio source L Figure 14 Input circuit module powered down For example 80 will reduce to 5 90 41 will reduce to 3 40 3 2 4 Other signal considerations The NEDSP1062 KBD requires a signal of 125mV rms or greater for optimum performance Signals lower than this may be used but the noise cancellation performance will decrease as the signal levels drops If the unit is used with low level signals such as microphones the signal will need amplifying before applying it to the NEDSP1062 KBD Due to the adaptive nature of the noise cancellation a small delay may be heard when the audio signal changes For optimum performance
15. ns This module is designed to pass speech Other signals such as data music and morse CW will to some degree pass through depending on the current filter level but the integrity of these signals cannot be guaranteed BD Operating Manua Page 5 1 Introduction This module is designed to be driven from a high level signal capable of driving a load of 220 The module can be easily modified to be driven from a lovv povver signal see section 3 3 for more information 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 in the audio path The heatsink doubles up as a mounting bracket The module can be mounted using the supplied self adhesive foam pad Ensure that none of the circuit pins can make contact s r adhesive 2 with any metallic parts For improved heat dissipation and a more rigid mechanical fixing the heatsink can be reversed and used as a bracket Using tne heatsink Note that the heatsink is at OV potential and therefore may have to be electrically insulated from any other metallic parts Alternatively the module has four fixing holes which allow it to be fixed to pillars See section 6 for hole details and physical dimensions Mounting using PCB pillars Figure 1 Mounting options Page 6 Insulator not supplied
16. ons 4 1 Keyboard 4 1 1 Power button 4 1 2 DSP level button 4 2 Setup 4 3 Demonstration modes 4 4 Noise cancellation levels Application notes 5 1 YaesuSP8 5 2 Kenwood SP31 5 3 bhilabel ONO OO 16 17 17 17 18 18 19 25 28 31 Physical dimensions 6 1 Physical dimensions 6 2 Keyboard hole drilling detail Troubleshooting Troubleshooting Other bhi products Other bhi products 32 35 37 38 1 ntroduction The NEDSP1061 KBD is a modular solution for noise reduction It incorporates Digital Signal Processing DSP technology to provide up to 35dB of noise cancellation and 65dB of tone reduction The module features an on board power amplifier to allow it to be easily incorporated 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 35d3B Input and output level controls Input level over load indication Virtually no distortion to speech signal Easy to install Up to 8 levels of noise reduction selectable Frequency response 50Hz 4 3KHz 3 Watts output 402 Single button operation with LED and audible indication 12 18V supply range 270 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 Limitatio
17. provide the module with a constant signal where possible When switching on the unit a thump may be heard in the loudspeaker Page 18 3 3 Driving from a lovv signal source The input to the module has a low impedance This is to provide correct loading to any power circuits driving it If the module needs to be driven from a low power signal then it must be modified in the following manner Cut the leg on this Note resistor Wiring omitted for Q clarity ra D 00000 Figure 15 Physical modification for low power signal drive Circuit modification Figure 16 Circuit modification for lov povver signal drive Page 19 4 Operation 4 Operation 4 1 Keyboard The keyboard has 2 buttons and a tricolour LED 4 1 1 Povver button The power button switched the module on and off When the module is off the audio bypasses the module so the circuit will behave as if the module isn t present Switching the power on routes the audio through the module Note If the power is on and the DSP is switched off the audio still passes through the DSP but without any signal processing A single press on the button switches on and a single press will switch off Also with the power connected and th
18. r tighten the screw 1 5 Sounder mounting Sounder Cut a small piece of the va self adhesive foam Self adhesive supplied to mount the Z sounder Do not cover the small hole in the face of the Keep this sounder hole clear For best results mount the sounder vvhere it can radiate sound to the outside the case for example on an air vent Backing paper Figure 5 Sounder mounting 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 the speech The following diagrams are taken from actual audio signals and illustrate how the signal is being processed Speech Noise Reduced noise Original signal Processed speech Speech with a lot of Speech with reduced background noise noise Figure 6 Noise cancellation NEDSP1062 KBD Operating Manual Page 9 2 Module description 2 Module description 2 1 Block diagram Output level se Clock generator gen Digital to analogue conversion m DSP core In Een Analogue to BCD Digital conversion DSP level select Internal pull up Relay 1 resistors NO Power supply section put level In set overload Input detect Load resistor A Keyboard microcontroller interface 5V
19. s page is intentionaly blank gt Page 36 NEDSP1062 KBD Operating Manual 7 Troubleshooting OULOOUSS GNOLL 2 USIUIJ USIUIJ 5 SPA 8 1 uun oA indino Vd Ld 1 A I A indino indjno sp loul S A s leulunll G31 peo 1810 MO sao6 431 os indu np ki uo q indu np ki DEOH AQ uolo s aas 9d pauuossig cd MOJ OO sereumwnyj jeubIs I A 1101 ON 037 peo S9AO Idul se 1u SOA uoleouuduue IeuollIppe ppw reubis oipne I A Addy ON Idul sp loul AWINJOA Indino juaionynsuy ZZ Ino olpne ON LZ Page 37 8 Other bhi products 8 Other bhi products Other noise cancellation products from bhi Visit www bhi ltd com for more information 8 1 NES10 2 MK3 Noise Eliminating speaker Amplified DSP noise cancellation speaker with new rotary filtter select knob and increased audio power Features Fully adaptive noise cancellation 9 35dB 8 user selectable noise cancellation levels Mono earpiece socket Input sensitivity control Noise cancellation On Off switch Audio Input LED indication of power and noise cancellation 12 24VDC operation On Off audio bypass switch Easy to install with adjustable mounting bracket 2m audio lead Optional extras avaiable 8 2 DS
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