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An allpass interpolated delay module where the delay time is taken from the first input pin. The second input pin is the audio to process. The module supports fractional delay times and uses linear interpolation between sample values. Delay times as small as 0 samples can be realized. If the delay time is exactly equal to 0, the module essentially runs in a bypass mode. The first input pin contains a single channel of data. The second input pin (audio) can be multichannel with the same processing applied to all channels. The delay line is incorporated into a first order allpass topology (transposed Direct Form II), with the feedback gain determined by the coef value, and the feedforward gain determined by -coef.

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The delay time is determined by the value on the first input pin times the .modDepth parameter. In normal use, the delay input variable is in the range [0 1] while .modDepth is set to maxDelay. The delay time is updated every samples.

See (8.D.2.3) AllpassDelayci for similar functionality but with cubic interpolation.

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typedef struct _ModuleAllpassDelayi
{
    ModuleInstanceDescriptor instance;            // Common Audio Weaver module instance structure
    INT32 maxDelay;                               // Maximum delay that can be realized, in samples. The size of the delay buffer (maxDelay+1)*numChannels
    FLOAT32 currentDelay;                         // Current delay
    FLOAT32 modDepth;                             // Maximum depth, in samples, of the modulation signal
    FLOAT32 coef;                                 // Feedback/-feedforward coefficient for the allpass delay.
    INT32 stateIndex;                             // Index of the oldest state variable in the array of state variables
    FLOAT32* state;                               // State variable array
} ModuleAllpassDelayiClass;

Variables

Properties

Pins

Input Pins

Name: mod

Description: modulation input

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