Results
Origonal Signal
Over all the system was a success. We were able to isolate
and eliminate the frequencies that had the feedback. Notice, in the
spectrogram, that the root frequency of the feedback, located at approximately
3000 Hz was almost completely eliminated.
Click here to listen to the Original
Signal in comparison to the Final Signal.
Conclusion
When listening to the edited signal you may have noticed that
there is still some audible feedback signal. However this is a flaw
in our model not in the system itself. This is because a real world
situation, if you eliminate the root resonance, then the harmonics also
disappear. Another attribute that cannot be captured in the recording
is the idea of adjusting the Eq. levels. Our system cuts out the majority
of the frequencies containing feedback, thus leaving only the edge frequencies
of the feedback. These will be so attenuated that they will not feed
back like the original feedback signal. Instead they will disappear
once the filtering begins. We were unable to sow this because out feedback
signal was recorded and not dynamic. However it is easy to envision how
those real world attributes would help the system.
Lastly, all of the processors, hardware and software used
in this model are readily available, thus it is simple to imagine the real
life implementation of this system.
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