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我錄製了一個彈奏吉他弦的音符,然後拿出每個和聲的振幅,並通過prgram(android)重新創建類似的聲音,但聲音不響很像吉他。通過原始音頻再現吉他弦與和聲
public void setToHarmonies(int[] harmonies, int frequency){
int total = 0;
int size = harmonies.length;
for(int i=0; i<size; i++){
total+=harmonies[i];
}
for(int i=0; i<numSamples; i++){
samples[i] = 0;
}
float[] effHarm = new float[size];
double[][] hwaves = new double[size][numSamples];
for(int i=0; i<size; i++){
effHarm[i] = ((float)(harmonies[i]-.2))/(float)total;
hwaves[i] = genSinWave(numSamples, frequency * i);
for(int e=0; e<numSamples; e++){
samples[e] += effHarm[i] * hwaves[i][e] * Math.exp((float)((float)e/(float)15000) * -1);
}
}
}
public double[] genSinWave(int size, int freq){
double[] samplesOut = new double[size];
float period = (float)sampleRate/(float)freq;
for(int i=0; i<samplesOut.length; i++){
samplesOut[i] = Math.sin(2 * i * Math.PI/period);
}
return samplesOut;
}
private static final int[] guitar = {699, 602, 465, 407, 544, 457, 443, 307, 283, 357, 342, 224};
上無畏的頻譜圖給我性否定值,最低爲-72.7,所以我從72.7減去的值在每一個峯值,然後乘以10來獲得上述值。編程錯了嗎?和聲內容/音色值是否錯誤?是否沒有辦法讓它發出吉他音,而不對波做出特定的攻擊和衰減修改?所有的幫助表示讚賞。
那麼'int []吉他是否意味着每個諧波的電平? – jaket 2014-12-10 23:36:43
是的。由於我除以「總數」,我認爲他們只需要處於正確的比例。對? – 2014-12-10 23:42:04
是的,這是正確的。你有沒有看過Karplus-Strong算法? http://www.cs.princeton.edu/courses/archive/fall07/cos126/assignments/guitar.html – jaket 2014-12-10 23:51:14