/*

 Copyright (C) 2016 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 This class implements a DC Rejection Filter which is used to get rid of the DC component in an audio signal

 */

#include "DCRejectionFilter.h"

const Float32 kDefaultPoleDist = 0.975f;

DCRejectionFilter::DCRejectionFilter()

{

    mY1 = mX1 = 0;

}

DCRejectionFilter::~DCRejectionFilter()

{

}

void DCRejectionFilter::ProcessInplace(Float32* ioData, UInt32 numFrames)

{

    for (UInt32 i=0; i < numFrames; i++)

    {

        Float32 xCurr = ioData[i];

        ioData[i] = ioData[i] - mX1 + (kDefaultPoleDist * mY1);

        mX1 = xCurr;

        mY1 = ioData[i];

    }

}