Sonnox Oxford Restore - Manual (Page 12)

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4. The Oxford DeBuzzer
4.1 Basic Operation
The Oxford DeBuzzer is divided into two stages: Detection and Removal.
Removal of buzz is usually accomplished by using a comb filter. The comb filter has many tight
notches in the frequency spectrum that eliminate the fundamental frequency and associated
harmonics of a buzz.
For this process to work well, the frequency of the fundamental must be very accurately
determined. There are several tools available to help isolate the fundamental frequency. The first
is the Peak Profile that is displayed immediately above the big central rotary control. This is a
plot of strength of a given nominal frequency in the input signal, and the display extends over a
wide range either side of the nominal frequency. With the nominal set to 50Hz, any peak
frequency between 45Hz and 55Hz will be displayed.