c@225: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
c@225: /*
c@225:     QM DSP Library
c@225: 
c@225:     Centre for Digital Music, Queen Mary, University of London.
c@225:     This file copyright 2005-2006 Christian Landone.
c@225:     All rights reserved.
c@225: */
c@225: 
c@225: #ifndef DECIMATOR_H
c@225: #define DECIMATOR_H
c@225: 
c@225: class Decimator  
c@225: {
c@225: public:
c@247:     void process( const double* src, double* dst );
c@247:     void doAntiAlias( const double* src, double* dst, unsigned int length );
c@225: 
c@279:     /**
c@279:      * Construct a Decimator to operate on input blocks of length
c@279:      * inLength, with decimation factor decFactor.  inLength should be
c@279:      * a multiple of decFactor.  Output blocks will be of length
c@279:      * inLength / decFactor.
c@279:      *
c@279:      * decFactor must be a power of two.  The highest supported factor
c@279:      * is obtained through getHighestSupportedFactor(); for higher
c@279:      * factors, you will need to chain more than one decimator.
c@279:      */
c@225:     Decimator( unsigned int inLength, unsigned int decFactor );
c@225:     virtual ~Decimator();
c@225: 
c@247:     int getFactor() const { return m_decFactor; }
c@247:     static int getHighestSupportedFactor() { return 8; }
c@247: 
c@225: private:
c@225:     void resetFilter();
c@225:     void deInitialise();
c@225:     void initialise( unsigned int inLength, unsigned int decFactor );
c@225: 
c@225:     unsigned int m_inputLength;
c@225:     unsigned int m_outputLength;
c@225:     unsigned int m_decFactor;
c@225: 
c@225:     double Input;
c@225:     double Output ;
c@225: 
c@225:     double o1,o2,o3,o4,o5,o6,o7;
c@225: 
c@225:     double a[ 9 ];
c@225:     double b[ 9 ];
c@225: 	
c@225:     double* decBuffer;
c@225: };
c@225: 
c@225: #endif //