Restoration VPI's  -  SpectralDeHiss

SpectralDehiss

SpectralDeHiss is a tool for de-noising, which employs a sophisticated 'fingerprinting' technique whereby the noise floor of a signal is analyzed during real-time program playback - even if the noise floor is not separate from the program. It is no longer necessary to look for a part of the recording where the noise is evident, as is necessary with other systems.

SpectralDeHiss can detect varying noise signals. Even highly colored noise/hiss is safely detected and removed. Through a completely new adaptive frequency filtering technique, SpectralDeHiss can reduce most difficult noise floors without influencing the desired signal or adding artifacts. The VPI has two main operator control areas. The 'Noise Floor' section lets you detect the actual noise fingerprints and smooth the estimated noise floor. The 'Gain' section has sliders for noise attenuation and separate faders to control smoothing in both time- and frequency-domain areas. The filter characteristics can also be optimized using perceptually weighted curves.

SpectralDehiss Expert

In addition to the two 'main' operator control areas 'Noise Floor' and 'Gain', we have added an additional 'Expert' page which supplements the standard functions with sophisticated possibilities for editing the SpectralDeHiss parameters.

On the 'Expert Page' the estimated noise floor is displayed and can be edited by hand for further optimisation. Additionally, the user can alternate between the display of the input and output spectrum of the signal and between the left and right channels. The frequency scale is divided into 25 bands, set in the psycho-acoustic optimal Bark scale, which optimally adapts to human hearing. For each of these bands the noise reduction can be adjusted for the left and right channel independently. Therefore, the noise reduction can easily be adapted to the special noise profile of the input signal. With these latest algorithms, difficult 'colored' noise problems such as air conditioning noise, 35mm camera noise and outdoor ambiences can be safely removed for the first time.

The Expert version of SpectralDeHiss has a new noise-free equalizing mode that allows one to change the output signal without changing the noise-floor as well. This helps to provide better control over your signal after de-noising - increasing clarity and intelligibility of the output program.