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Disco DSP - Schroeder 1

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0 CommentsDeveloper : Disco DSP
Type : Plugin | OS : Win 32Bit, Win 64Bit, Linux | Format : Standalone, VST, VST3, AU, AAX
Tags : Reverb
Schroeder 1

Description

Schroeder 1.1 is a modeled reverb based on Schroeder reverberator.

Early Schroeder reverberators consisted of the following elements: A series connection of several all-pass filters, a parallel bank of feedback comb filters, a mixing matrix.

The all-pass filters provide colourless high-density echoes in the late impulse response of the reverberator. These all-pass filters may also be referred to as diffusers. While all-pass filters are colourless in theory, perceptually, their impulse responses are only colourless when they are extremely short (less than 10 ms or so). Longer all-pass impulse responses sound similar to feedback comb-filters. For steady-state tones, however, such as sinusoids, the all-pass property gives the same gain at every frequency, unlike comb filters.

The parallel comb-filter bank is intended to give a psychoacoustically appropriate fluctuation in the reverberator frequency response. A feedback comb filter can simulate a pair of parallel walls, so one could choose the delay-line length in each comb filter to be the number of samples it takes for a plane wave to propagate from one wall to the opposite wall and back.

Thus, one may choose the comb-filter delay-line lengths more or less arbitrarily, and then use enough of them in parallel (with mutually prime delay-line lengths) to achieve a perceptually adequate fluctuation density in the frequency-response magnitude. In four such delays are chosen between 30 and 45 ms, and the corresponding feedback coefficients are set to give the desired overall decay time.

Disco DSP - Schroeder 1

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