Akso - Audio DSP Platform

Declaration

// A=-0,26120387496374144251476820691706
// B = 0,4459029062228060818860761551878

// truncated Hadamard form

//   0 1 2   3 4 5 6
// 0 B A B   A B A B
// 1 A B B   A A B B
// 2 B B A   A B B A
// 3 A A A   B B B B

// 4 B A B   B A B A
// 5 A B B   B B A A
// 6 B B A   B A A B

// 14* 35+
void AH7(int32_t x0, int32_t x1, int32_t x2, int32_t x3, int32_t x4, int32_t x5,
         int32_t x6, int32_t &y0, int32_t &y1, int32_t &y2, int32_t &y3,
         int32_t &y4, int32_t &y5, int32_t &y6) {

  int32_t A = -1121862100;
  int32_t B = 1915138399;
  y0 = ___SMMLA(x1 + x3 + x5, A, ___SMMUL(x0 + x2 + x4 + x6, B));
  y1 = ___SMMLA(x0 + x3 + x4, A, ___SMMUL(x1 + x2 + x5 + x6, B));
  y2 = ___SMMLA(x2 + x3 + x6, A, ___SMMUL(x0 + x1 + x4 + x5, B));
  y3 = ___SMMLA(x0 + x1 + x2, A, ___SMMUL(x3 + x4 + x5 + x6, B));

  y4 = ___SMMLA(x1 + x4 + x6, A, ___SMMUL(x0 + x2 + x3 + x5, B));
  y5 = ___SMMLA(x0 + x5 + x6, A, ___SMMUL(x1 + x2 + x3 + x4, B));
  y6 = ___SMMLA(x2 + x4 + x5, A, ___SMMUL(x0 + x1 + x3 + x6, B));
}

Audio Rate

AH7(inlet_in0, inlet_in1, inlet_in2, inlet_in3, inlet_in4, inlet_in5, inlet_in6,
    outlet_out0, outlet_out1, outlet_out2, outlet_out3, outlet_out4,
    outlet_out5, outlet_out6);

AH7

7x7 Almost Hadamard matrix

Author: Smashed Transistors

License: LGPL

Github: tiar/FDN/AH7.axo

Inlets

Outlets