digitalFilter.h

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/*
 * ----------------------------------------------------------------------------
 * "THE BEER-WARE LICENSE" (Revision 42):
 * As long as you retain this notice you can do whatever you want with this 
 * stuff. If we meet some day, and you think this stuff is worth it, you can 
 * buy me a beer in return.
 * - Joe Romano and Will McMahan
 * ----------------------------------------------------------------------------
 */
//@author  Joe Romano
//@author  Will McMahan
//@email   joeromano@gmail.com
//@brief   digitalFilter.h - class to create IIR and FIR digital filter
//         coefficients in the Matlab (2010) style. This style being vectors
//         of coefficients for the numberator (b) and denominator (a) 
//         respectively. 
//         Please refer to the matlab documentation page for implementation
//         details: http://www.mathworks.com/access/helpdesk/help/techdoc/ref/filter.html

#ifndef _DIGITALFILTER_H_
#define _DIGITALFILTER_H_

class digitalFilter
{

public:
        // Constructors
        digitalFilter(int filterOrder_userdef, bool isIIR);     
        digitalFilter(int filterOrder_userdef, bool isIIR, float *b_userdef, float *a_userdef);

        ~digitalFilter(void);   // Destructor

        float getNextFilteredValue(float u_current);

protected:
        float *a, *b;           // filter coefficients
        float *u, *x;           // filter input and output states
        
private:
        int filterOrder;
        bool IIR;
        
};

#endif