The DC Filter
Removing DC offsets
The DC Filter is a core module provided on every CEDAR Cambridge system.
It offers a roll-off of 12dB/octave at any user-defined frequency in the range 1Hz - 20Hz and, because removing DC offsets improves the signal modelling used elsewhere in CEDAR Cambridge, it is invaluable when used before restoration modules such as Declickle-2, Vintage Decrackle, Auto Dehiss, and NR-4. It also increases signal headroom, and allows you to apply higher gains to output signals if desired.
Users may place the DC Filter anywhere in the signal chain, and can determine which channels are affected by the filter. A convenient display indicates the magnitude of any DC offset identified and (if desired) removed by the system.