seiichi horie / Mbed 2 deprecated synthesizer_f746

Synthesizer based on the Unzen / Nucleo F746ZG

Dependencies:   amakusa mbed-dsp mbed shimabara ukifune unzen_nucleo_f746

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Show/hide line numbers dcblocker.cpp Source File

dcblocker.cpp

00001 #include "signal_processing.h"
00002 
00003 /*
00004 * Related Link
00005 * https://www.dsprelated.com/freebooks/filters/DC_Blocker.html
00006 * https://ccrma.stanford.edu/~jos/fp/DC_Blocker.html
00007 */
00008 
00009 DCBlocker::DCBlocker(  uint32_t blockSize ) : amakusa::AbstractFilter ( blockSize )
00010 {
00011     this->x_last = 0;
00012     this->y_last = 0;
00013 }
00014 
00015 void DCBlocker::run( float32_t *pSrc, float32_t *pDst )
00016 {
00017         // if the parameter is non-zero, take it. If the parameter is zero, use default.
00018     
00019     for ( int i = 0; i < this->block_size; i++ )
00020     {
00021             // y = x - x * z^-1 + 0.995 * y * z^-1
00022         pDst[ i ] = pSrc[ i ] - this->x_last + 0.995f * this->y_last;
00023         this->x_last = pSrc[ i ];
00024         this->y_last = pDst[ i ];
00025     }
00026     
00027 }
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