Articles: Audio Restoration

Procopy has extensive experience of enhancing and restoring audio from digital and analogue sources. Since forensic audio assignments are confidential in nature, we can only provide general examples of our work in our blog. For a confidential discussion of your specific needs, please contact us.

Possible results from forensic audio treatments

The goal is to make speech in covert recordings more understandable by improving the quality of the audio so it may be used for a transcript or playback at a trial.

Improving voice quality

Recordings typically have a very poor signal to noise ratio, and speech is often masked by buzzes, high or low frequency noises and impulse noises such as pops and crackles.

Dealing with technical issues

Sometimes the recording device also introduces problems such as tape saturation, clipping, hum or distortion. This is analysed initially by trained ear (an art in itself) to isolate problems.

Digitising and filters

The audio is digitised, sampled and measured. Filters are used to enhance the audio to a point where transcription is possible and/or the target sounds can be heard more clearly.