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BHI NEDSP1062 KBD Installation And Operating Manual

Amplified noise eliminating dsp module
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DSP Noise Cancellation
22 Woolven Close
tel: +44 (0)845 217 9926
fax: +44 (0)845 217 9936
Page 40
NEDSP1062-KBD Operating Manual
bhi
bhi
bhi
bhi
bhi
bhi Ltd
Burgess Hill
West Sussex
RH15 9RR
sales@bhi-ltd.co.uk
www.bhi-ltd.co.uk
bhi
bhi
bhi
bhi
bhi
NEDSP1062 KBD
Amplified Noise Eliminating DSP Module
I
O
nstallation and
perating
1062-107D
Issue E
NEDSP1062-KBD Operating Manual
M
anual
Page 1

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  • Page 1 NEDSP1062 KBD Amplified Noise Eliminating DSP Module nstallation and perating anual DSP Noise Cancellation bhi Ltd 22 Woolven Close Burgess Hill West Sussex RH15 9RR tel: +44 (0)845 217 9926 fax: +44 (0)845 217 9936 sales@bhi-ltd.co.uk 1062-107D www.bhi-ltd.co.uk Issue E...
  • Page 2 20 Watt extension speaker Mounting stand for the NEIM1031. hereof without obligation of bhi Ltd. to notify any for use with the NEIM1031. Allows the NEIM1031 to be ad- person of such revision or changes.

  • Page 3: Table Of Contents

    Contents 8. Other bhi products Introduction Other noise cancellation products from bhi. Visit www.bhi-ltd.co.uk for more information. NEDSP1062-KBD features Limitations 8.1 NES10-2 MKII Noise Eliminating speaker. Module connection and mounting DSP noise cancellation built into a compact Keyboard mounting speaker unit. the unit provides an easy to...
  • Page 4 7. Troubleshooting Physical dimensions Physical dimensions Keyboard hole drilling detail Troubleshooting Troubleshooting Other bhi products Other bhi products Page 4 Page 37 NEDSP1062-KBD Operating Manual NEDSP1062-KBD Operating Manual...

  • Page 5: Introduction

    1. Introduction. 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.

  • Page 6: Module Connection And Mounting

    This module is designed to be driven from a high level 6.2 Template. signal, capable of driving a load of 22W. The following drawing shows the sizes and positions of (The module can be easily modified to be driven from a holes for the keyboard.

  • Page 7: Keyboard Mounting

    Insulator If the installation has limited (not supplied) space, and is housed in a metal 29.8 enclosure, the heatsink can be 25.3 removed, and the module 20.2 mounted directly on the chassis. The voltage regulator needs to be 13.4 correctly insulated as the tab is connected to 0V.

  • Page 8: Sounder Mounting

    If the enclosure is too Nut & keyboard 34.2 washer thin to incorporate a Front panel countersunk screw label (such as fitting into sheet metal) then it can be retained by a instrument head Front screw. panel The label needs to be cut out to allow the Cut hole Retaining...

  • Page 9: Dsp Noise Cancellation

    1.6 DSP Noise cancellation. 6.1 Physical dimensions. The following diagrams detail the physical dimensions The bhi DSP processes the incoming signal and then of the module. All dimensions are in mm. differentiates the speech from the noise. The unwanted noise and interference is then attenuated to leave only the speech.

  • Page 10: Module Description

    2. Module description. 5.3 bhi Label. 2.1 Block diagram. Connections Supplied with the module is a square bhi label. Fix the label on the top of the speaker enclosure as shown. Xtal Output level Power Clock generator Relay 1 Digital to analogue...

  • Page 11: Module Layout

    Input 2.2 Module Layout. selector connections Keyboard switch The following diagram shows the layout of the NEDSP1062-KBD module. Note: Input Wiring obmitted for clarity level set (P2) Filter Audio bypass Mounting relay holes Sounder Sounder Input overload Output volume (P3) indicator LED level set (P1) Figure 8.

  • Page 12: Controls

    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.

  • Page 13: Electrical Characteristics

    5.2 Kenwood SP31. 2.5 Electrical characteristics. Keyboard This section ELECTRICAL CHARACTERISTICS i i i i i describes the general =16V, T = 25 C unless otherwise stated) fitting of the DC CHARACTERISTICS NEDSP1062-KBD module in the Symbol Parameter Test Conditions Min.
  • Page 14 Figure 10. Frequency response 1000 2000 3000 4000 5000 6000 -3dB = 16V = 8W P = 1W Frequency (Hz) module Figure 11. Distortion vs. Output power = 16V = 8W f = 1KHz Input = 4W Power Output power (W) connector Figure 24.
  • Page 15 Figure 12. Sensitivity. = 16V f = 1KHz = 8W = 4W Input voltage (mV) Figure 23. Circuit diagram of installation in Yaesu SP8. Page 26 Page 15 NEDSP1062-KBD Operating Manual NEDSP1062-KBD Operating Manual...

  • Page 16: Installation

    5. Application Notes. 3. Installation This section provides information into installing the 3.1 Installation overview. NEDSP1062-KBD into Amateur radio speaker units. The NEDSP1062-KBD module is inserted into the path of noisy audio. The input and output level controls allow 5.1 Yaesu SP8. the module to be fine tuned to suit most applications.

  • Page 17: Module Setup

    20dB may need to be reduced or go to the FAQ page on the 25dB 24dB bhi website and download the FAQ on RF breakthrough. 65dB 35dB Under certain conditions the DSP can create a small Table 4. Tone and noise reduction levels.

  • Page 18: Changes To Output Load

    3.2.3 Change to output load. 4.3 Demonstration modes. Start The audio input to the Start module is loaded at 22W. This load is Noise cancellation Noise cancellation effectively connected across the output load Audio Wait 3 Seconds Wait 1.5 Seconds Input when the unit is switched off...

  • Page 19: Driving The Module From A Low Level Signal

    To listen to the demonstration modes, or change the 3.3 Driving from a low signal source. number of DSP levels it is necessary to put the module into the set up mode. The input to the module has a low impedance. This is to provide correct loading to any power circuits driving it.

  • Page 20: Keyboard

    4. Operation. 4.2 Set up. 4.1 Keyboard. The following flow chart shows the functions of the DSP The keyboard has 2 buttons and a tricolour LED. button. Power up 4.1.1 Power button. Holding down the DSP The power button switched the module on and off. When button when switching on the module is off, the audio bypasses the module, so DSP button...

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