BHI Noise Away Manuel de service télécharger pdf (Page 6)

Page 6

1.3 Audio DSP Noise cancellation.

The bhi DSP processes the incoming audio 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 audio signal is being

processed.

Figure 1. Noise cancellation.

Original signal.

Speech with a lot of

background noise

Processed speech.

Speech with reduced

noise

Speech Noise

Reduced noise

This module is designed for communication type

applications. The upper frequency limit is 4.5KHz and

therefore not suitable for hi fidelity applications.

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6. Operation

6.1 Introduction.

All functions of the NEDSP1061-KBD are controlled by

a single button.

• Single press turns the noise cancellation on/off.

• Holding down the button changes the DSP filter

level.

The mode of operation is indicated both visually and

audibly.

The LED is illuminated red when the noise cancellation

is off.

When the noise cancellation level is changed the LED

will flash green to indicate which level has been selected.

Simultaneously the DSP will beep to give audible

indication of DSP level. This allows the operator to change

the DSP level without having to look at the LED to see

which level has been selected.

A short beep is emitted to acknowledge a button press.

The module will store the current DSP level, and will return

to this level when the equipment is switched on.

6.2 Operation.

Switch on the equipment.

The LED will illuminate red to indicate the noise

cancellation is off. The unit will flash/beep to indicate the

DSP filter level last used.

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BHI Noise Away Manuel de service Page 6

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