AllPassFilter.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "DSP/Delay.h"
 
namespace Audio
{
    // Implementation of a delay line with a feedback/feedforward gain coefficient
    // APF filters pass all frequencies but changes phase relationships of frequencies
    class FDelayAPF : public FDelay
    {
    public:
        // Constructor
        SIGNALPROCESSING_API FDelayAPF();
 
        // Destructor
        SIGNALPROCESSING_API ~FDelayAPF();
 
        // Set the APF feedback/feedforward gain coefficient
        void SetG(float InG) { G = InG; }
 
        // overrides
        SIGNALPROCESSING_API virtual float ProcessAudioSample(const float pInput) override;
 
    protected:
        // Feedback/Feedforward gain coefficient
        float G;
 
    };
 
}