python实时音频处理
时间: 2023-10-20 21:35:08 浏览: 159
在Python中,我们可以使用IPython.display.Audio库来实现实时音频处理。通过使用该库的IPython.display.Audio函数,我们可以在Jupyter Notebook中直接播放音频。例如,可以使用以下代码播放音频:
```python
from IPython.display import Audio
Audio(audio_data)
```
要分析实时音频数据,我们可以使用librosa库。librosa库提供了一些功能,可以提取音频的特征,并进行实时音频处理。以下是一些常用的实时音频处理技术:
1. 波形图:我们可以使用librosa.display.waveplot函数绘制音频的波形图,这可以帮助我们了解给定时间内音频的响度。
```python
import librosa.display
import matplotlib.pyplot as plt
plt.figure(figsize=(20, 5))
librosa.display.waveplot(y, sr=sr)
plt.show()
```
2. 频谱图:我们可以使用librosa库的spectral_bandwidth函数计算音频的频谱带宽,并使用librosa.display.waveplot函数绘制音频的波形图,以及使用plt.plot函数绘制不同频谱带宽的曲线。
```python
spectral_bandwidth_2 = librosa.feature.spectral_bandwidth(x, hop_length=hop_length, sr=sr, p=2)[0]
spectral_bandwidth_3 = librosa.feature.spectral_bandwidth(x, hop_length=hop_length, sr=sr, p=3)[0]
spectral_bandwidth_4 = librosa.feature.spectral_bandwidth(x, hop_length=hop_length, sr=sr, p=4)[0]
librosa.display.waveplot(x, sr=sr, alpha=0.4)
plt.plot(t, normalize(spectral_bandwidth_2), color='r')
plt.plot(t, normalize(spectral_bandwidth_3), color='g')
plt.plot(t, normalize(spectral_bandwidth_4), color='y')
plt.legend(('p=2', 'p=3', 'p=4'))
plt.show()
```
3. 过零率:可以使用librosa.feature.zero_crossing_rate函数计算音频的过零率,并使用plt.plot函数绘制过零率的曲线。
```python
zcrs = librosa.feature.zero_crossing_rate(x)
print(zcrs.shape)
plt.figure(figsize=(14, 5))
plt.plot(zcrs<span class="em">1</span><span class="em">2</span><span class="em">3</span><span class="em">4</span>
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