level changes due to dramatic boost or cut adjustments.
The Notch switch puts the filter into notch filter mode. It provides a deep cut of over 60dB which can be varied in fre- quency to address any part of the audio spectrum, providing in excess of 60dB of attenuation at the center frequency. The Q control varies the bandwidth of the notch from narrow to wide, while the
The Notch filter is useful in corrective applications where it can be used to attenuate mains hum and similar ‘pitched’ interference. Because mains hum contains harmonics, better results are often achieved by using two Notch filters together, one tuned to the fundamental frequency and one an octave higher. The narrower the notch, the less the wan- ted sound will be affected by the filtering. Notch filtering also can be used to simulate phasing by manually sweeping
NOTCH
The Notch filter provides attenuation of more than 60dB per filter stage.
It is variable in Q and roll- off.
Create a pseudo stereo image from a mono source by splitting the signal and applyind different notches.
Fig. 9:
Notch:
Curve 1: Q = 1,5;
Curve 2: Q = 0,2;
Fig. 10:
Notch:
Curve 1: Q = 1,5;
Curve 2: Q = 0,2;
CONTROLS
OPTIMIZER | 19 |
