如何使用NWaves (或任何其他库)获得WAV音频的频率A到频率B的严格/锐减？
如何使用NWaves (或任何其他库)获得WAV音频的频率A到频率B的严格/锐减？
提问于 2022-10-20 17:27:02
我需要一个尖锐的“削减”的WAV音频文件从频率A (500赫兹)到频率B (800赫兹)，并将其放入一个新的文件。
我试过使用NWaves.Filters.Butterworth.BandPassFilter，但它并没有按照我想要的方式实现：BandPassFilter。不够锋利
DiscreteSignal signal = waveContainer[Channels.Average];
int samplingRate = signal.SamplingRate;
int lowerFrequencyHz = 500;
int upperFrequencyHz = 800;
double lowerFrequency = (double)lowerFrequencyHz / samplingRate;
double upperFrequency = (double)upperFrequencyHz / samplingRate;
var tf = new NWaves.Filters.Butterworth.BandPassFilter(lowerFrequency, upperFrequency, 3).Tf;
var filter = new NWaves.Filters.Base64.IirFilter64(tf);
var filtered = signal.Samples.Select(s => (float)filter.Process(s));
DiscreteSignal outSignal = new DiscreteSignal(signal.SamplingRate, filtered);我如何使用C#和可能的NWaves库实现它，使它变得像Adobe一样精确地选择、复制和粘贴？
回答 1
Stack Overflow用户
回答已采纳
发布于 2022-10-22 13:48:48
我找到了怎么做
DiscreteSignal signal = waveContainer[Channels.Average];
int samplingRate = signal.SamplingRate;
int lowerFrequencyHz = 500;
int upperFrequencyHz = 800;
double lowerFrequency = (double)lowerFrequencyHz / samplingRate;
double upperFrequency = (double)upperFrequencyHz / samplingRate;
var tf = new NWaves.Filters.Butterworth.BandPassFilter(lowerFrequency, upperFrequency, 5).Tf;
var filter = new NWaves.Filters.Base64.IirFilter64(tf);
var filtered = signal.Samples.Select(s => (float)filter.Process(s));
DiscreteSignal outSignal = new DiscreteSignal(signal.SamplingRate, filtered);
for (int i = 0; i < 5; i++) // 1 + 5 iterations makes it very clear and sharp
{
filtered = outSignal.Samples.Select(s => (float)filter.Process(s));
outSignal = new DiscreteSignal(outSignal.SamplingRate, filtered);
}主要的事情是：
- 带通滤波器阶数为5
- 6次迭代过滤使其清晰而清晰。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/74144008
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