Technical information

ANEM Operating ManualANEM Operating Manual
Page 5
1. Introduction.
Figure 1. Noise cancellation.
Original signal.
Speech with a lot of
background noise
Processed speech.
Speech with reduced
noise
Speech Noise
Reduced noise
Features:
 Noise reduction 9 – 35dB
 Tone reduction 4 – 65 dB
 Power supply 12 – 18 V dc
 Input signal > 50mV
 Output load 2.5W 8ohm
 Current consumption 300mA
 Audio bandwidth 50 – 4.3KHz
 Dimensions (WxDxH) 100 x 60 x 40mm
 4 or 8 filter levels (selectable)
 Visual and audio indication of filter level
 Audio bypass when switched off
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.
1.2 DSP Noise cancellation.
Page 24
6. Other bhi products
Other noise cancellation products from bhi. Visit
www.bhi-ltd.co.uk for more information.
DSP noise cancellation built into a
compact speaker unit. the unit pro-
vides an easy to install solution to noise
reduction
Features:
• Fully adaptive noise cancellation 9 -35dB
• 8 user selectable noise cancellation levels
• Mono earpiece socket
• Input sensitivity control
• Noise cancellation On/Off switch
• LED indication of power and noise cancellation
• 12-24VDC operation
• On/Off audio bypass switch.
• Greatly improved signal to noise ratio
• Easy to install with adjustable mounting bracket
• 2m audio lead
• Optional extras avaiable.
6.1 NES10-2 MKII Noise Eliminating speaker.
6. Other bhi products.