seiichi horie / amakusa

Basic Audio Signal Processing Library

Dependents:   unzen_sample_nucleo_f746 skeleton_unzen_nucleo_f746 ifmag_noise_canceller synthesizer_f746

オーディオ信号処理用のライブラリです。

mbed-dspのフィルタ群向けに作ったクラス・ラッパーのほか、以下のクラスを用意しています。

  • ヒステリシス
  • sin/cosオシレータ
  • リミッター

クラスは全て名前空間amakusaに含まれます。

biquadcascadedf1.h

Committer:
shorie
Date:
2017-02-10
Revision:
5:3d6cf4dbf458
Parent:
1:0a37bce4f985
Child:
6:ed10856c2305

File content as of revision 5:3d6cf4dbf458:

#ifndef _BIQUADCASCADEDF1_H_
#define _BIQUADCASCADEDF1_H_

#include "abstractfilter.h"
namespace amakusa
{
/**
* @brief Wrapper class of the arm_biquad_cascade_df1_f32() and the arm_biquad_cascade_df1_init_f32().
* @details
* To use this class, include amakusa.h
*
* The biquad filter is depicted as following. The pCoeff array has b0, b1, b2, a1, a2 parameter
* by this order. If the stage is N, N blockes of these parameers are given. The length of pCoeff
* is 5N. 
* @code
x[n]---+-- b0 -->+---------+---y[n]
       |         ^         |
       D         |         |
       +-- b1 -->+<-- a1 --+
       D         |         |
       +-- b2 -->+<-- a2 --+
* @endcode
*/
    class BiQuadCascadeDF1 : public AbstractFilter
    {
    public:
            /**
            * @brief Constructor
            * @param[in] stages Number of the Bi-Quad stages. 
            * @param[in] pCoeff Ponter to the coefficients array.
            * @param[in] blockSize Maximum number of the samples to be given to run() method at onece. 
            */
        BiQuadCascadeDF1(uint16_t stages, float32_t *pCoeff, uint32_t block_size);
            /**
            * deconstructor
            */
        virtual ~BiQuadCascadeDF1();
            /**
            * @brief Run the filter.
            * @param[in] pSrc Pointer to the source buffer to be filtered.
            * @param[out] pDst Pointer to the destination buffer to store the filtered signal. 
            * @param[in] blockSize Number of the sample to be filitered. If skipped or zero, blockSize is assmued the one passed to the constructor. 
            */
        virtual void run( float32_t *pSrc, float32_t *pDst );
    private:
        arm_biquad_casd_df1_inst_f32 state;
    };
    
}

#endif