lua/src/lpf.h

   1 /***
   2  Low Pass Filter
   3  @classmod a.lpf
   4 */
   5
   6 #ifndef LUA_LIBA_LPF_H
   7 #define LUA_LIBA_LPF_H
   8
   9 #include "a.h"
  10
  11 /***
  12  Low Pass Filter
  13  @field alpha filter coefficient [0,1]
  14  @field output filter output
  15  @table a.lpf
  16 */
  17 #if defined(__cplusplus)
  18 extern "C" {
  19 #endif /* __cplusplus */
  20
  21 /***
  22  constructor for Low Pass Filter
  23  @tparam number fc cut-off frequency unit(hz)
  24  @tparam number ts sampling time unit(s)
  25  @treturn a.lpf Low Pass Filter userdata
  26  @function new
  27 */
  28 int liba_lpf_new(lua_State *L);
  29
  30 /***
  31  generate for Low Pass Filter
  32  @tparam number fc cut-off frequency unit(hz)
  33  @tparam number ts sampling time unit(s)
  34  @treturn a.lpf Low Pass Filter userdata
  35  @function gen
  36 */
  37 int liba_lpf_gen(lua_State *L);
  38
  39 /***
  40  calculate for Low Pass Filter
  41  @tparam number x input value
  42  @treturn number output value
  43  @function iter
  44 */
  45 int liba_lpf_iter(lua_State *L);
  46
  47 /***
  48  zeroing for Low Pass Filter
  49  @treturn a.lpf Low Pass Filter userdata
  50  @function zero
  51 */
  52 int liba_lpf_zero(lua_State *L);
  53
  54 #if defined(__cplusplus)
  55 } /* extern "C" */
  56 #endif /* __cplusplus */
  57
  58 #endif /* lpf.h */