不韋 呂 / Mbed 2 deprecated UIT2_VowelSynthesizer

Vowel synthesizer using digital resonators. This program can run without LCD display. ディジタル共振器を使った合成母音ジェネレータ．LCD表示器なしでも動く．

Dependencies:   UITDSP_ADDA UIT_ACM1602NI UIT_AQM1602 mbed

Synthesizer/Resonator.cpp@5:0396de26b449, 2015-07-25 (annotated)

Committer:
MikamiUitOpen
Date:
Sat Jul 25 07:10:11 2015 +0000
Revision:
5:0396de26b449
Parent:
Resonator.cpp@4:dd2ec72068d0 
6

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 0:6c67a9387981 1 //------------------------------------------------------------------------------
MikamiUitOpen 0:6c67a9387981 2 // 音声合成で使う共振器
MikamiUitOpen 0:6c67a9387981 3 // 作成者：三上直樹，2013/11/27 作成，(c)三上直樹 2013
MikamiUitOpen 0:6c67a9387981 4 //------------------------------------------------------------------------------
MikamiUitOpen 0:6c67a9387981 5
MikamiUitOpen 0:6c67a9387981 6 #include "Resonator.hpp"
MikamiUitOpen 0:6c67a9387981 7
MikamiUitOpen 0:6c67a9387981 8 namespace Mikami
MikamiUitOpen 0:6c67a9387981 9 {
MikamiUitOpen 0:6c67a9387981 10 // コンストラクタに共通な初期化
MikamiUitOpen 0:6c67a9387981 11 void Resonator::Initialize(float fr, float bw, float fs)
MikamiUitOpen 0:6c67a9387981 12 {
MikamiUitOpen 0:6c67a9387981 13 if (piT_ == 0) piT_ = 3.14159265f/fs;
MikamiUitOpen 0:6c67a9387981 14 Set(fr, bw);
MikamiUitOpen 0:6c67a9387981 15 Clear();
MikamiUitOpen 0:6c67a9387981 16 }
MikamiUitOpen 0:6c67a9387981 17
MikamiUitOpen 0:6c67a9387981 18 // 共振器のパラメータの設定
MikamiUitOpen 0:6c67a9387981 19 void Resonator::Set(float fr, float bw)
MikamiUitOpen 0:6c67a9387981 20 {
MikamiUitOpen 0:6c67a9387981 21 a1_ = 2.0f*exp(-piT_*bw)*cos(2.0f*piT_*fr);
MikamiUitOpen 0:6c67a9387981 22 a2_ = -exp(-2.0f*piT_*bw);
MikamiUitOpen 0:6c67a9387981 23 b0_ = 1.0f - a1_ - a2_;
MikamiUitOpen 0:6c67a9387981 24 }
MikamiUitOpen 0:6c67a9387981 25
MikamiUitOpen 0:6c67a9387981 26 // 共振器に対応する処理の実行
MikamiUitOpen 0:6c67a9387981 27 float Resonator::Execute(float xin)
MikamiUitOpen 0:6c67a9387981 28 {
MikamiUitOpen 0:6c67a9387981 29 float ym = a1_*yn1_ + a2_*yn2_ + b0_*xin;
MikamiUitOpen 0:6c67a9387981 30 yn2_ = yn1_; // 遅延器のデータの移動
MikamiUitOpen 0:6c67a9387981 31 yn1_ = ym; // 遅延器のデータの移動
MikamiUitOpen 0:6c67a9387981 32 return ym;
MikamiUitOpen 0:6c67a9387981 33 }
MikamiUitOpen 0:6c67a9387981 34
MikamiUitOpen 0:6c67a9387981 35 // "π/標本化周波数" の値に対応する実体
MikamiUitOpen 0:6c67a9387981 36 float Resonator::piT_ = 0;
MikamiUitOpen 0:6c67a9387981 37 }
MikamiUitOpen 0:6c67a9387981 38