Flanger Inverted Mode

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Index: Physical Audio Signal Processing

Physical Audio Signal Processing

Flanging

Flanger Depth Control

Flanger Feedback Control

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The amplitude response of an LTI filter is simply the magnitude of the (complex) frequency response — Click for https://ccrma.stanford.edu/~jos/filters/Amplitude_Response_I_I.html

A filter in the audio signal processing context is any operation that accepts a signal as an input and produces a signal as an output. Most practical audio filters are linear and time invariant, in which case they can be characterized by their impulse response or their frequency response. — Click for https://ccrma.stanford.edu/~jos/filters/What_Filter.html

dc stands for direct current in electrical engineering and signal processing (as opposed to 'alternating current'). The mean (average value) of a signal may be called its dc component. Similarly, frequency zero is called the dc frequency, because a sinusoid with zero frequency is a constant signal. — Click for https://ccrma.stanford.edu/~jos/filters/Mathematical_Sine_Wave_Analysis.html

Bass tones are generally low in pitch and contain a lot of low-frequency content. Low-pass filters emphasize low frequencies. For example, turning up the bass knob on a stereo controls a low-pass filter that increases the amount of low-frequency content you hear. — Click for http://ccrma.stanford.edu/~jos/filters/Simplest_Lowpass_Filter_I.html

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Index: Physical Audio Signal Processing

Physical Audio Signal Processing

Flanging

Flanger Depth Control

Flanger Feedback Control

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 $y(t) = \frac{d}{dt}x(t)$ . An ideal differentiator eliminates dc and provides a progressive high-frequency boost rising 6 dB per octave (specifically, the amplitude response is $\left\vert H(\omega)\right\vert = \left\vert\omega\right\vert$ ).

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``Physical Audio Signal Processing'', by Julius O. Smith III, W3K Publishing, 2010, ISBN 978-0-9745607-2-4
Copyright © 2024-06-28 by Julius O. Smith III
Center for Computer Research in Music and Acoustics (CCRMA), Stanford University

Flanger Inverted Mode

``Physical Audio Signal Processing'', by Julius O. Smith III, W3K Publishing, 2010, ISBN 978-0-9745607-2-4 Copyright © 2024-06-28 by Julius O. Smith III Center for Computer Research in Music and Acoustics (CCRMA), Stanford University

``Physical Audio Signal Processing'', by Julius O. Smith III, W3K Publishing, 2010, ISBN 978-0-9745607-2-4
Copyright © 2024-06-28 by Julius O. Smith III
Center for Computer Research in Music and Acoustics (CCRMA), Stanford University