Audio enhancement analysis can greatly improve the intelligibility of recorded dialog. Many times recorded evidence is gathered in such a way that it becomes poor quality and can be very hard if not impossible to transcribe accurately. The listeners ability to understand dialog that has been recorded on tape or a digital hand held device can make or break a case.
 When a recording is made in such a way that it worsens the signal to noise ratio it becomes problematic for the listener. Transcription of noisy audio is very difficult for many reasons. One significant reason is that the transcription expert must hear through layers of noise to transcribe difficult to hear dialog. This inability to hear the spoken words or content of the dialog can render critical areas of interest as [inaudible]
These noise signals are categorized as Continuous noise, Impulse
noise and Non Impulse noise. |
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Waveform reconstruction is the basis
for Forensic Noise removal. The original recording is digitized and analyzed with the computer. Continuous or Impulse noises are recognized with software as it peaks and is compressed or removed depending on the method.
Non Impulse noise is removed in a similar way.
Utilizing sophisticated software it is removed or reduced by
sampling the offending sound and adjusting the software to
recognize its unique pattern. |
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