BHI NEDSP1962-PCB User Manual

1. Introduction
The NEDSP1962-PCB is a modular solution for noise reduction. It incorporates Digital Signal
Processing (DSP) technology to provide up to 40 dB of noise reduction and up to 65 dB of
heterodyne tone reduction. The module features an on-board power amplifier to allow it to
be easily incorporated into existing equipment, in line with the loudspeaker.
1.1 The NEDSP1962-PCB Module features:
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Fully adaptable noise cancellation up to 40dB
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Overall Gain control
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Input level overload indicator
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Virtually no distortion to speech signals
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Easy to install
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8 levels of Noise Reduction
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Frequency Response (50 Hz to 5 kHz)
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Up to 7.5 Watts output (4Ω)
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Noise Reduction can be preset or remotely set during operation
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10 to 18 Volts DC supply range
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Wide range of connection possibilities
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Mounting Holes
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Audio bypassed when power disconnected or the module is placed in its Off state.
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Small Size 70.6 mm x 50.1 mm
1.2 Limitations
This module is designed to pass speech. Other signals such as data, music and morse (CW)
will pass through to some degree depending on the filter level setting, but the integrity of
these signals cannot be guaranteed.
This module is designed to be driven from a High-Level signal source capable of operating
into a load of 62Ω impedance.
Important Note: The Audio Output Amplifier is 'Class D' and therefore neither of the output
wires should have any connection to ground, they should only be connected to a speaker or
a fully isolated socket for headphones.
1.3 Module connection and mounting
Connections to the module are made via connection pads down either side of the PCB.
These pads are in 0.1" (2.54 mm) pitch connector spacings, which allows the use of standard
pin headers, PCB connectors or direct wiring. The connector positioning has been made
such that the module may be 'Plugged' into a mother board as part of a larger system.
It is recommended that the module is securely fitted using the 4 off M3 securing holes
provided, making sure that the module is stood at least 3 mm off any surface underneath it.
See section 6 for the module physical dimensions, connector positions and fixing
information.
NEDSP1962-PCB Draft User Manual