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BHI NEDSP1062 KBD Installation And Operating Manual

Amplified noise eliminating dsp module
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NEDSP1062 KBD
Amplified Noise Eliminating DSP Module
I
nstallation and
NEDSP1062-KBD Operating Manual
bhi
bhi
bhi
bhi
bhi
O
perating
1062-107D
Issue D
M
anual
Page 1

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Summary of Contents for BHI NEDSP1062 KBD

  • Page 1 NEDSP1062 KBD Amplified Noise Eliminating DSP Module nstallation and perating anual 1062-107D Issue D Page 1 NEDSP1062-KBD Operating Manual...
  • Page 2 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 2...

  • Page 3: Table Of Contents

    3.2.4 Other signal considerations Driving the module from a low level signal Functions Keyboard 4.1.1 Power button 4.1.2 DSP level button Set up Demonstration modes Noise cancellation levels Application notes Yaesu SP8 Kenwood SP31 bhi label Page 3 NEDSP1062-KBD Operating Manual...
  • Page 4 Physical dimensions Physical dimensions Keyboard hole drilling detail Troubleshooting Troubleshooting Other bhi products Other bhi products Page 4 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 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). 1.3 Module connection and mounting The module is supplied with a pre-wired 2.1mm power connector.

  • Page 7: Keyboard Mounting

    Insulator If the installation has limited (not supplied) 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 0V.

  • Page 8: Sounder Mounting

    If the enclosure is too Nut & keyboard 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 hole cut out to allow the Retaining...

  • Page 9: Dsp Noise Cancellation

    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.

  • Page 10: Module Description

    2. Module description. 2.1 Block diagram. Connections Xtal Output level Pow er Clock generator Relay 1 Digital to analogue Agnd conversion DSP core Agnd Analogue to Input level Digital conversion DSP level select overload Input detect Load resistor Keyboard microcontroller interface Internal pull up...

  • Page 11: Module Layout

    2.2 Module Layout. The following diagram shows the layout of the NEDSP1062-KBD module. Note: Input Wiring obmitted for clarity level set (P2) Audio Mounting bypass holes relay Sounder Input overload Output volume (P3) indicator LED level set (P1) Figure 8. NEDSP1062-KBD connections and controls 2.3 Pin functions.

  • 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

    2.5 Electrical characteristics. ELECTRICAL CHARACTERISTICS i i i i i =16V, T = 25 C unless otherwise stated) DC CHARACTERISTICS Symbol Parameter Test Conditions Min. Typ. Max. Units Supply voltage = 12V Quiescent current = 16V = 18V = 12V Quiescent current DSP on = 16V no load no signal...
  • Page 14 Figure 10. Frequency response 1000 2000 3000 4000 5000 6000 -3dB = 16V = 8W P = 1W Frequency (Hz) Figure 11. Distortion vs. Output power = 16V = 8W f = 1KHz = 4W Output power (W) Page 14 NEDSP1062-KBD Operating Manual...
  • Page 15 Figure 12. Sensitivity. = 16V f = 1KHz = 8W = 4W Input voltage (mV) Page 15 NEDSP1062-KBD Operating Manual...

  • Page 16: Installation

    3. Installation 3.1 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 Power amp (Loudspeaker) Break Circuit here Keyboard...

  • Page 17: Module Setup

    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 when the unit has no signal applied.

  • Page 18: Changes To Output Load

    3.2.3 Change to output load. The audio input to the module is loaded at 22W. This load is effectively connected across the output load Audio Input when the unit is switched off (bypassed). Load This will reduce the Agnd impedance presented Agnd to the audio source.

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

    3.3 Driving from a low 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.

  • Page 20: Keyboard

    4. Operation. 4.1 Keyboard. The keyboard has 2 buttons and a tricolour LED. 4.1.1 Power 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.

  • Page 21: Set Up

    4.2 Set up. The following flow chart shows the functions of the DSP button. Power up Holding down the DSP button when switching on DSP button causes the module to enter pressed the set up mode. This is indicated by a 2 2 tone sound tone beep.
  • Page 22 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.

  • Page 23: Demonstration Modes

    4.3 Demonstration modes. Start Start Noise cancellation Noise cancellation Wait 3 Seconds Wait 1.5 Seconds Noise cancellation of f Noise cancellation of f Wait 3 Seconds Increase DSP noise cancellation lev el DSP button pressed? Figure 19. Highest Lev el? Demonstration modes.

  • Page 24: Noise Cancellation Levels

    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. Level Level Tone Reduction White Noise Reduction 11dB 13dB 15dB 16dB 17dB 21dB 20dB 25dB 24dB 65dB...

  • Page 25: Application Notes

    5. Application Notes. This section provides information into installing the NEDSP1062-KBD into Amateur radio speaker units. 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 internal filters.
  • Page 26 Figure 23. Circuit diagram of installation in Yaesu SP8. Page 26 NEDSP1062-KBD Operating Manual...
  • Page 27 module Input Power connector Figure 24. Complete installation in the Yaesu SP8. Page 27 NEDSP1062-KBD Operating Manual...

  • Page 28: Kenwood Sp31

    5.2 Kenwood SP31. Keyboard This section describes the general fitting of the NEDSP1062-KBD module in the Kenwood SP31 loudspeaker. This installation retains the operation of the internal filters. Figure 25. NEDSP1062-KBD installed in a Kenwood SP31. This photograph shows the suggested location for mounting the keyboard.
  • Page 29 Figure 28. Circuit diagram of installation in Kenwood SP31. Page 29 NEDSP1062-KBD Operating Manual...
  • Page 30 Input selector connections Keyboard switch Filter Sounder NEDSP module (screwed to the case, using an existing hole) Figure 29. Photograph of complete installation. Page 30 NEDSP1062-KBD Operating Manual...

  • Page 31: Bhi Label

    5.3 bhi Label. Supplied with the module is a square bhi label. Fix the label on the top of the speaker enclosure as shown. Noise Cancellation Figure 30. bhi label. Page 31 NEDSP1062-KBD Operating Manual...

  • Page 32: Physical Dimensions

    6. Physical Dimensions 6.1 Physical dimensions. The following diagrams detail the physical dimensions of the module. All dimensions are in mm. 3mm dia 2.97 Pin 1 30.3 34.3 36.5 Figure 31. Mounting hole positions. Page 32 NEDSP1062-KBD Operating Manual...
  • Page 33 34.2 Components fitted to rear of PCB Figure 32. Overall dimensions. 16.1 Viewed from the end of the module Figure 33. Hole dimensions of power devices - for direct mounting applications. Page 33 NEDSP1062-KBD Operating Manual...
  • Page 34 29.8 25.3 20.2 13.4 Figure 34. Keyboard dimensions. 8mm diameter Figure 35. Power connector hole size. Page 34 NEDSP1062-KBD Operating Manual...
  • Page 35 6.2 Template. The following drawing shows the sizes and positions of holes for the keyboard. 3mm CSK to 5mm 13.4 18.5 29.8 Not to scale all dimensions in mm Figure 36. Keyboard drilling detail . Page 35 NEDSP1062-KBD Operating Manual...
  • Page 36 <This page is intentionaly blank> Page 36 NEDSP1062-KBD Operating Manual...

  • Page 37: Troubleshooting

    7. Troubleshooting Page 37 NEDSP1062-KBD Operating Manual...

  • Page 38: Other Bhi Products

    8. Other bhi products Other noise cancellation products from bhi. Visit www.bhi-ltd.co.uk for more information. 8.1 NES10-2 MKII Noise Eliminating speaker. DSP noise cancellation built into a compact speaker unit. the unit provides an easy to install solution to noise reduction Features: •...
  • Page 39 8.3 NEIM1031 In-line module. Then NEIM1031 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.
  • Page 40 DSP Noise Cancellation bhi Ltd P.O. Box 318 Burgess Hill West Sussex RH15 9NR tel: +44 (0)845 2179926 fax: +44 (0)845 2179936 sales@bhi-ltd.co.uk www.bhi-ltd.co.uk Page 40 NEDSP1062-KBD Operating Manual...

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