www.pudn.com > slow.zip > tonedec.h

struct tone_detector 
  { tone_detector(fspec*, fspec*, fspec*, bool); 
    ~tone_detector(); 
    void insert(float); 
    void debug(); 
    float pow; 
    int prescount; 
    bool present; 
private: 
    filter *fef, *bpf, *lpf; 
    bool limit; 
  };