Denoiser SNR2000

Fig. 2.2: Comparing the BEHRINGER TAC filter circuitry and the conventional RMS characteristic curve

2.2.1 SENSITIVITY control

This control determines the sensitivity of the filter. If the input level exceeds the value adjusted with the SENSITIVITY control, the dynamic filter begins to open. If the adjusted value is, for example, -30 dBu, high- frequency signals with a level above -30 dBu cause the filter to open.

+The SENSITIVITY setting depends on the type of noise and the application on hand. If the control is set to a value which is above the noise floor level of the input signal, there is the risk of muting the signal’s high-frequency portions. It is therefore necessary to set the SENSITIVITY control very carefully.

2.2.2 CUT OFF control

The CUT OFF control sets the lower cut off frequency of the dynamic filter. Under most conditions, this control should be set at 800 Hz, allowing for the maximum possible amount of noise reduction. The cut off frequency should be increased if you want to affect noise in the upper portion of a signal only or if too drastic noise reduction leads to unwanted side effects.

For example, if you wish to only eliminate noise in the upper frequency range, say from 2 to 20 kHz, set the CUT OFF control at 2 kHz. Frequencies below 2 kHz will not be affected.

2.2.3 RELEASE control

We recommend fast release settings on individual instruments or vocals. This is because there is no real ambience to the signal. Release times about 0.06 to 0.2 seconds would be perfect.

However, with mastered signals or composite music, slower release times should be used. Release times slightly greater than 0.2 seconds are generally ideal. Avoid using very long release rates in this application to reduce the risk of audible noise tail effects.

Using longer release rates (around one second) allows the DENOISER to “denoise” effects returns. Audible and unnatural cutting-off of the reverb will thus be avoided.

2. OPERATION