### Flanger Inverted Mode

A different type of maximum depth is obtained for . In this case, the peaks and notches of the case trade places. In practice, the depth control is usually constrained to the interval , and a sign inversion for is controlled separately using a phase inversion'' switch.

In inverted mode, unless the delay is very large, the bass response will be weak, since the first notch is at dc. This case usually sounds high-pass filtered relative to the in-phase'' case ().

As the notch spacing grows very large ( shrinks), the amplitude response approaches that of a first-order difference , which approximates a differentiator . An ideal differentiator eliminates dc and provides a progressive high-frequency boost rising 6 dB per octave (specifically, the amplitude response is ).

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Flanger Depth Control