<\/p>\n\/\/ ——————————————————————————–
\n\/\/ CMyFilter
\n\/\/ ——————————————————————————–
\nclass CMyFilter
\n{
\nprivate:
\n\t\/\/ \u30d5\u30a3\u30eb\u30bf\u306e\u4fc2\u6570
\n\tfloat a0, a1, a2, b0, b1, b2;
\n\t\/\/ \u30d0\u30c3\u30d5\u30a1
\n\tfloat out1, out2;
\n\tfloat in1, in2;<\/p>\n
public:
\n\tinline CMyFilter();<\/p>\n
\t\/\/ \u5165\u529b\u4fe1\u53f7\u306b\u30d5\u30a3\u30eb\u30bf\u3092\u9069\u7528\u3059\u308b\u95a2\u6570
\n\tinline float Process(float in);<\/p>\n
\t\/\/ \u30d5\u30a3\u30eb\u30bf\u4fc2\u6570\u3092\u8a08\u7b97\u3059\u308b\u30e1\u30f3\u30d0\u30fc\u95a2\u6570
\n\tinline void LowPass (float freq, float q , float samplerate = 44100.0f);
\n\tinline void HighPass (float freq, float q , float samplerate = 44100.0f);
\n\tinline void BandPass (float freq, float bw, float samplerate = 44100.0f);
\n\tinline void Notch (float freq, float bw, float samplerate = 44100.0f);
\n\tinline void LowShelf (float freq, float q , float gain, float samplerate = 44100.0f);
\n\tinline void HighShelf(float freq, float q , float gain, float samplerate = 44100.0f);
\n\tinline void Peaking (float freq, float bw, float gain, float samplerate = 44100.0f);
\n\tinline void AllPass (float freq, float q , float samplerate = 44100.0f);
\n};<\/p>\n
\/\/ ——————————————————————————–
\n\/\/ \u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf
\n\/\/ ——————————————————————————–
\nCMyFilter::CMyFilter()
\n{
\n\t\/\/ \u30e1\u30f3\u30d0\u30fc\u5909\u6570\u3092\u521d\u671f\u5316
\n\ta0 = 1.0f; \/\/ 0\u4ee5\u5916\u306b\u3057\u3066\u304a\u304b\u306a\u3044\u3068\u9664\u7b97\u3067\u30a8\u30e9\u30fc\u306b\u306a\u308b
\n\ta1 = 0.0f;
\n\ta2 = 0.0f;
\n\tb0 = 1.0f;
\n\tb1 = 0.0f;
\n\tb2 = 0.0f;<\/p>\n
\tin1 = 0.0f;
\n\tin2 = 0.0f;<\/p>\n
\tout1 = 0.0f;
\n\tout2 = 0.0f;
\n}<\/p>\n
\/\/ ——————————————————————————–
\n\/\/ \u5165\u529b\u4fe1\u53f7\u306b\u30d5\u30a3\u30eb\u30bf\u3092\u9069\u7528\u3059\u308b\u95a2\u6570
\n\/\/ ——————————————————————————–
\nfloat CMyFilter::Process(float in)
\n{
\n\t\/\/ \u5165\u529b\u4fe1\u53f7\u306b\u30d5\u30a3\u30eb\u30bf\u3092\u9069\u7528\u3057\u3001\u51fa\u529b\u4fe1\u53f7\u5909\u6570\u306b\u4fdd\u5b58\u3002
\n\tfloat out = b0 \/ a0 * in + b1 \/ a0 * in1 + b2 \/ a0 * in2
\n\t\t– a1 \/ a0 * out1 – a2 \/ a0 * out2;<\/p>\n
\tin2 = in1; \/\/ 2\u3064\u524d\u306e\u5165\u529b\u4fe1\u53f7\u3092\u66f4\u65b0
\n\tin1 = in; \/\/ 1\u3064\u524d\u306e\u5165\u529b\u4fe1\u53f7\u3092\u66f4\u65b0<\/p>\n
\tout2 = out1; \/\/ 2\u3064\u524d\u306e\u51fa\u529b\u4fe1\u53f7\u3092\u66f4\u65b0
\n\tout1 = out; \/\/ 1\u3064\u524d\u306e\u51fa\u529b\u4fe1\u53f7\u3092\u66f4\u65b0<\/p>\n
\t\/\/ \u51fa\u529b\u4fe1\u53f7\u3092\u8fd4\u3059
\n\treturn out;
\n}<\/p>\n
\/\/ ——————————————————————————–
\n\/\/ \u30d5\u30a3\u30eb\u30bf\u4fc2\u6570\u3092\u8a08\u7b97\u3059\u308b\u30e1\u30f3\u30d0\u30fc\u95a2\u6570
\n\/\/ ——————————————————————————–
\nvoid CMyFilter::LowPass(float freq, float q, float samplerate)
\n{
\n\t\/\/ \u30d5\u30a3\u30eb\u30bf\u4fc2\u6570\u8a08\u7b97\u3067\u4f7f\u7528\u3059\u308b\u4e2d\u9593\u5024\u3092\u6c42\u3081\u308b\u3002
\n\tfloat omega = 2.0f * 3.14159265f * freq \/ samplerate;
\n\tfloat alpha = sin(omega) \/ (2.0f * q);<\/p>\n
\t\/\/ \u30d5\u30a3\u30eb\u30bf\u4fc2\u6570\u3092\u6c42\u3081\u308b\u3002
\n\ta0 = 1.0f + alpha;
\n\ta1 = -2.0f * cos(omega);
\n\ta2 = 1.0f – alpha;
\n\tb0 = (1.0f – cos(omega)) \/ 2.0f;
\n\tb1 = 1.0f – cos(omega);
\n\tb2 = (1.0f – cos(omega)) \/ 2.0f;
\n}<\/p>\n
void CMyFilter::HighPass(float freq, float q, float samplerate)
\n{
\n\t\/\/ \u30d5\u30a3\u30eb\u30bf\u4fc2\u6570\u8a08\u7b97\u3067\u4f7f\u7528\u3059\u308b\u4e2d\u9593\u5024\u3092\u6c42\u3081\u308b\u3002
\n\tfloat omega = 2.0f * 3.14159265f * freq \/ samplerate;
\n\tfloat alpha = sin(omega) \/ (2.0f * q);<\/p>\n
\t\/\/ \u30d5\u30a3\u30eb\u30bf\u4fc2\u6570\u3092\u6c42\u3081\u308b\u3002
\n\ta0 = 1.0f + alpha;
\n\ta1 = -2.0f * cos(omega);
\n\ta2 = 1.0f – alpha;
\n\tb0 = (1.0f + cos(omega)) \/ 2.0f;
\n\tb1 = -(1.0f + cos(omega));
\n\tb2 = (1.0f + cos(omega)) \/ 2.0f;
\n}<\/p>\n
void CMyFilter::BandPass(float freq, float bw, float samplerate)
\n{
\n\t\/\/ \u30d5\u30a3\u30eb\u30bf\u4fc2\u6570\u8a08\u7b97\u3067\u4f7f\u7528\u3059\u308b\u4e2d\u9593\u5024\u3092\u6c42\u3081\u308b\u3002
\n\tfloat omega = 2.0f * 3.14159265f * freq \/ samplerate;
\n\tfloat alpha = sin(omega) * sinh(log(2.0f) \/ 2.0 * bw * omega \/ sin(omega));<\/p>\n
\t\/\/ \u30d5\u30a3\u30eb\u30bf\u4fc2\u6570\u3092\u6c42\u3081\u308b\u3002
\n\ta0 = 1.0f + alpha;
\n\ta1 = -2.0f * cos(omega);
\n\ta2 = 1.0f – alpha;
\n\tb0 = alpha;
\n\tb1 = 0.0f;
\n\tb2 = -alpha;
\n}<\/p>\n
void CMyFilter::Notch(float freq, float bw, float samplerate)
\n{
\n\t\/\/ \u30d5\u30a3\u30eb\u30bf\u4fc2\u6570\u8a08\u7b97\u3067\u4f7f\u7528\u3059\u308b\u4e2d\u9593\u5024\u3092\u6c42\u3081\u308b\u3002
\n\tfloat omega = 2.0f * 3.14159265f * freq \/ samplerate;
\n\tfloat alpha = sin(omega) * sinh(log(2.0f) \/ 2.0 * bw * omega \/ sin(omega));<\/p>\n
\t\/\/ \u30d5\u30a3\u30eb\u30bf\u4fc2\u6570\u3092\u6c42\u3081\u308b\u3002
\n\ta0 = 1.0f + alpha;
\n\ta1 = -2.0f * cos(omega);
\n\ta2 = 1.0f – alpha;
\n\tb0 = 1.0f;
\n\tb1 = -2.0f * cos(omega);
\n\tb2 = 1.0f;
\n}<\/p>\n
void CMyFilter::LowShelf(float freq, float q, float gain, float samplerate)
\n{
\n\t\/\/ \u30d5\u30a3\u30eb\u30bf\u4fc2\u6570\u8a08\u7b97\u3067\u4f7f\u7528\u3059\u308b\u4e2d\u9593\u5024\u3092\u6c42\u3081\u308b\u3002
\n\tfloat omega = 2.0f * 3.14159265f * freq \/ samplerate;
\n\tfloat alpha = sin(omega) \/ (2.0f * q);
\n\tfloat A = pow(10.0f, (gain \/ 40.0f));
\n\tfloat beta = sqrt(A) \/ q;<\/p>\n
\t\/\/ \u30d5\u30a3\u30eb\u30bf\u4fc2\u6570\u3092\u6c42\u3081\u308b\u3002
\n\ta0 = (A + 1.0f) + (A – 1.0f) * cos(omega) + beta * sin(omega);
\n\ta1 = -2.0f * ((A – 1.0f) + (A + 1.0f) * cos(omega));
\n\ta2 = (A + 1.0f) + (A – 1.0f) * cos(omega) – beta * sin(omega);
\n\tb0 = A * ((A + 1.0f) – (A – 1.0f) * cos(omega) + beta * sin(omega));
\n\tb1 = 2.0f * A * ((A – 1.0f) – (A + 1.0f) * cos(omega));
\n\tb2 = A * ((A + 1.0f) – (A – 1.0f) * cos(omega) – beta * sin(omega));
\n}<\/p>\n
void CMyFilter::HighShelf(float freq, float q, float gain, float samplerate)
\n{
\n\t\/\/ \u30d5\u30a3\u30eb\u30bf\u4fc2\u6570\u8a08\u7b97\u3067\u4f7f\u7528\u3059\u308b\u4e2d\u9593\u5024\u3092\u6c42\u3081\u308b\u3002
\n\tfloat omega = 2.0f * 3.14159265f * freq \/ samplerate;
\n\tfloat alpha = sin(omega) \/ (2.0f * q);
\n\tfloat A = pow(10.0f, (gain \/ 40.0f));
\n\tfloat beta = sqrt(A) \/ q;<\/p>\n
\t\/\/ \u30d5\u30a3\u30eb\u30bf\u4fc2\u6570\u3092\u6c42\u3081\u308b\u3002
\n\ta0 = (A + 1.0f) – (A – 1.0f) * cos(omega) + beta * sin(omega);
\n\ta1 = 2.0f * ((A – 1.0f) – (A + 1.0f) * cos(omega));
\n\ta2 = (A + 1.0f) – (A – 1.0f) * cos(omega) – beta * sin(omega);
\n\tb0 = A * ((A + 1.0f) + (A – 1.0f) * cos(omega) + beta * sin(omega));
\n\tb1 = -2.0f * A * ((A – 1.0f) + (A + 1.0f) * cos(omega));
\n\tb2 = A * ((A + 1.0f) + (A – 1.0f) * cos(omega) – beta * sin(omega));
\n}<\/p>\n
void CMyFilter::Peaking(float freq, float bw, float gain, float samplerate)
\n{
\n\t\/\/ \u30d5\u30a3\u30eb\u30bf\u4fc2\u6570\u8a08\u7b97\u3067\u4f7f\u7528\u3059\u308b\u4e2d\u9593\u5024\u3092\u6c42\u3081\u308b\u3002
\n\tfloat omega = 2.0f * 3.14159265f * freq \/ samplerate;
\n\tfloat alpha = sin(omega) * sinh(log(2.0f) \/ 2.0 * bw * omega \/ sin(omega));
\n\tfloat A = pow(10.0f, (gain \/ 40.0f));<\/p>\n
\t\/\/ \u30d5\u30a3\u30eb\u30bf\u4fc2\u6570\u3092\u6c42\u3081\u308b\u3002
\n\ta0 = 1.0f + alpha \/ A;
\n\ta1 = -2.0f * cos(omega);
\n\ta2 = 1.0f – alpha \/ A;
\n\tb0 = 1.0f + alpha * A;
\n\tb1 = -2.0f * cos(omega);
\n\tb2 = 1.0f – alpha * A;
\n}<\/p>\n
void CMyFilter::AllPass(float freq, float q, float samplerate)
\n{
\n\t\/\/ \u30d5\u30a3\u30eb\u30bf\u4fc2\u6570\u8a08\u7b97\u3067\u4f7f\u7528\u3059\u308b\u4e2d\u9593\u5024\u3092\u6c42\u3081\u308b\u3002
\n\tfloat omega = 2.0f * 3.14159265f * freq \/ samplerate;
\n\tfloat alpha = sin(omega) \/ (2.0f * q);<\/p>\n
\t\/\/ \u30d5\u30a3\u30eb\u30bf\u4fc2\u6570\u3092\u6c42\u3081\u308b\u3002
\n\ta0 = 1.0f + alpha;
\n\ta1 = -2.0f * cos(omega);
\n\ta2 = 1.0f – alpha;
\n\tb0 = 1.0f – alpha;
\n\tb1 = -2.0f * cos(omega);
\n\tb2 = 1.0f + alpha;
\n}
\n[\/crayon]<\/p>\n
\u4f7f\u7528\u4f8b<\/h1>\n
Wav\u30d5\u30a1\u30a4\u30eb\u7b49\u3078\u9069\u7528\u3059\u308b\u5834\u5408\u306f\u4e0b\u8a18\u306e\u3088\u3046\u306a\u611f\u3058\u3067\u4f7f\u7528\u3044\u305f\u3060\u3051\u307e\u3059\u3002
\n[crayon]
\n\/\/ \u305d\u308c\u305e\u308c\u306e\u5909\u6570\u306f\u4e0b\u8a18\u306e\u3068\u304a\u308a\u3068\u3059\u308b
\n\/\/ \u3000short input[] \u202644100Hz\u3067\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u3055\u308c\u305f\u5165\u529b\u4fe1\u53f7\u306e\u683c\u7d0d\u3055\u308c\u305f\u30d0\u30c3\u30d5\u30a1\u3002
\n\/\/ \u3000short output[] \u2026\u30d5\u30a3\u30eb\u30bf\u51e6\u7406\u3057\u305f\u5024\u3092\u66f8\u304d\u51fa\u3059\u51fa\u529b\u4fe1\u53f7\u306e\u30d0\u30c3\u30d5\u30a1\u3002
\n\/\/ \u3000int size \u2026\u5165\u529b\u4fe1\u53f7\u30fb\u51fa\u529b\u4fe1\u53f7\u306e\u30d0\u30c3\u30d5\u30a1\u306e\u30b5\u30a4\u30ba\u3002<\/p>\n
CMyFilter filter;<\/p>\n
\/\/ \u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570 1000Hz\u3001Q\u5024 1\/\u221a2\u306e\u30ed\u30fc\u30d1\u30b9\u30d5\u30a3\u30eb\u30bf\u306b\u8a2d\u5b9a
\nfilter.LowPass(1000.0f, 1.0f\/sqrt(2.0f));<\/p>\n
\/\/ \u5165\u529b\u4fe1\u53f7\u306b\u30d5\u30a3\u30eb\u30bf\u3092\u9069\u7528\u3057\u3066\u3044\u304f\u3002
\nfor(int i = 0; i < size; i++)\n{\n\t\/\/ \u5165\u529b\u4fe1\u53f7\u306b\u30d5\u30a3\u30eb\u30bf\u3092\u9069\u7528\u3057\u3001\u51fa\u529b\u4fe1\u53f7\u3068\u3057\u3066\u66f8\u304d\u51fa\u3059\u3002\n\toutput[i] = (short)filter.Process((float)input[i]);\n}\n[\/crayon]\n\n\nVST\u306e\u3088\u3046\u306b\u5165\u529b\u30fb\u51fa\u529b\u306e\u30d0\u30c3\u30d5\u30a1\u304cfloat\u578b\u306e\u5834\u5408\u3001\u4f7f\u3044\u65b9\u306f\u4e0b\u8a18\u306e\u3088\u3046\u306a\u611f\u3058\u3067\u3059\u3002\n[crayon]\n\/\/ \u305d\u308c\u305e\u308c\u306e\u5909\u6570\u306f\u4e0b\u8a18\u306e\u3068\u304a\u308a\u3068\u3059\u308b\n\/\/ \u3000float input[] \u202644100Hz\u3067\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u3055\u308c\u305f\u5165\u529b\u4fe1\u53f7\u306e\u683c\u7d0d\u3055\u308c\u305f\u30d0\u30c3\u30d5\u30a1\u3002\n\/\/ \u3000float output[] \u2026\u30d5\u30a3\u30eb\u30bf\u51e6\u7406\u3057\u305f\u5024\u3092\u66f8\u304d\u51fa\u3059\u51fa\u529b\u4fe1\u53f7\u306e\u30d0\u30c3\u30d5\u30a1\u3002\n\/\/ \u3000int size \u2026\u5165\u529b\u4fe1\u53f7\u30fb\u51fa\u529b\u4fe1\u53f7\u306e\u30d0\u30c3\u30d5\u30a1\u306e\u30b5\u30a4\u30ba\u3002\n\nCMyFilter filter;\n\n\/\/ \u30ab\u30c3\u30c8\u30aa\u30d5\u5468\u6ce2\u6570 1000Hz\u3001Q\u5024 1\/\u221a2\u306e\u30ed\u30fc\u30d1\u30b9\u30d5\u30a3\u30eb\u30bf\u306b\u8a2d\u5b9a\nfilter.LowPass(1000.0f, 1.0f\/sqrt(2.0f));\n\n\/\/ \u5165\u529b\u4fe1\u53f7\u306b\u30d5\u30a3\u30eb\u30bf\u3092\u9069\u7528\u3057\u3066\u3044\u304f\u3002\nfor(int i = 0; i < size; i++)\n{\n\t\/\/ \u5165\u529b\u4fe1\u53f7\u306b\u30d5\u30a3\u30eb\u30bf\u3092\u9069\u7528\u3057\u3001\u51fa\u529b\u4fe1\u53f7\u3068\u3057\u3066\u66f8\u304d\u51fa\u3059\u3002\n\toutput[i] = filter.Process(input[i]);\n}\n[\/crayon]\n\n<\/p>\n","protected":false},"excerpt":{"rendered":"
\u7c21\u5358\u306a\u30c7\u30b8\u30bf\u30eb\u30d5\u30a3\u30eb\u30bf\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9 \u7c21\u5358\u306a\u30c7\u30b8\u30bf\u30eb\u30d5\u30a3\u30eb\u30bf\u306e\u5b9f\u88c5\u3067\u8aac\u660e\u3057\u305f\u30d5\u30a3\u30eb\u30bf\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u3059\u3002 \u3054\u5229\u7528\u306e\u969b\u306f\u30b3\u30d4\u30da\u3057\u3066\u304a\u4f7f\u3044\u304f\u3060\u3055\u3044\u3002 [crayon] #pragma once; #include \/\/ […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"open","ping_status":"open","template":"","meta":{"footnotes":""},"class_list":["post-728","page","type-page","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t