third_party/soloud_speech/resonator.h

   1 #ifndef RESONATOR_H
   2 #define RESONATOR_H
   3
   4 class resonator
   5 {
   6         float mA, mB, mC, mP1, mP2;
   7 public:
   8
   9         /* Convert formant freqencies and bandwidth into resonator difference equation coefficents
  10          */
  11         void initResonator(
  12                 int aFrequency,                       /* Frequency of resonator in Hz  */
  13                 int aBandwidth,                      /* Bandwidth of resonator in Hz  */
  14                 int aSamplerate);
  15
  16         /* Convert formant freqencies and bandwidth into anti-resonator difference equation constants
  17          */
  18         void initAntiresonator(
  19                 int aFrequency,                       /* Frequency of resonator in Hz  */
  20                 int aBandwidth,                      /* Bandwidth of resonator in Hz  */
  21                 int aSamplerate);
  22
  23         /* Set gain */
  24         void setGain(float aG);
  25
  26         /* Generic resonator function */
  27         float resonate(float input);
  28
  29         /* Generic anti-resonator function
  30            Same as resonator except that a,b,c need to be set with initAntiresonator()
  31            and we save inputs in p1/p2 rather than outputs.
  32            There is currently only one of these - "mNasalZero"
  33
  34            Output = (mNasalZero.a * input) + (mNasalZero.b * oldin1) + (mNasalZero.c * oldin2)
  35          */
  36
  37         float antiresonate(float input);
  38
  39         resonator();
  40
  41         ~resonator();
  42 };
  43
  44 #endif