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NEDSP1061-KBD Operating Manual
This module is designed for communication type
applications. The upper frequency limit is 4.5KHz and
therefore not suitable for hi fidelity applications.
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
1.
Introduction.
