Foenics - FPI's - Noise-Removal
Noise-Removal FPI is a specialized denoising tool for forensic purposes. It employs highly efficient 'fingerprinting' techniques whereby it is no longer necessary to search for a section of the recording where the noise is evident, as necessary with other systems. This is very important in the forensic casework because even complex material can be denoised to enhance the signals intelligibility. The Noise-Removal FPI offers a lot of new opportunities to the analyst.
To be able to achieve best results, the estimated fingerprint of the noise floor is freely scaleable in the frequency domain. Additionally, the noise floor is adjustable in the psychoacoustically optimized Bark scale to alter the filter characteristic of the denoising process. These characteristics can be optimized by using perceptually weighted curves and a free scaleable strength of the denoising. An important feature is the ability to equalize the processed signal without affecting the residual noise. This allows the amplification of important frequency ranges containing the desired information (e.g. speech components) and to attenuate other areas (e.g. high and low frequency distortions). Based on this high performance algorithms it is possible to reduce the noise floor up to 40dB without generating artefacts like 'musical tones'.
The adjustments are simplified by the display of the input or output spectra of the signal, the corresponding noise floor estimation, and the ability to listen to the removed part of the signal in real-time. Using this feature, the forensic analyst can ensure that no information is lost.
