完成一个程序,实现如下功能 (1)程序每间隔 0.5秒扬声器发出不同频率的声音,每次升高100HZ,直到频率达到2000hz。 (2)谱曲功能:首先给出基准节拍,并定义每个音节频率,输入一串字符串,可输出一段音乐。
时间: 2024-05-05 11:16:45 浏览: 18
这个程序需要使用Python语言和PyAudio库。
首先,我们需要安装PyAudio库:
```
pip install pyaudio
```
然后,我们可以写一个函数来生成不同频率的声音:
```python
import math
import pyaudio
import time
def play_sound(frequency, duration):
p = pyaudio.PyAudio()
volume = 0.5 # range [0.0, 1.0]
sample_rate = 44100 # number of samples per second
samples = (p.get_sample_size(pyaudio.paFloat32) * sample_rate * duration)
stream = p.open(format=pyaudio.paFloat32,
channels=1,
rate=sample_rate,
output=True)
for i in range(samples):
value = volume * math.sin(2.0 * math.pi * frequency * float(i) / float(sample_rate))
stream.write(value.tostring())
stream.close()
p.terminate()
```
这个函数接受两个参数:频率和持续时间。它使用PyAudio库生成一个波形,并播放它。
现在,我们可以写一个循环来播放一系列升高的频率:
```python
frequency = 100
while frequency <= 2000:
play_sound(frequency, 0.5)
frequency += 100
```
这个循环每次调用`play_sound`函数,使用不同的频率播放声音,并等待0.5秒。
最后,我们可以实现谱曲功能。先定义一些基本的变量:
```python
beats_per_minute = 120
base_frequency = 440 # A4
notes = {
'C': 261.63,
'D': 293.66,
'E': 329.63,
'F': 349.23,
'G': 392.00,
'A': 440.00,
'B': 493.88
}
```
这些变量包括每分钟节拍数,基准频率和每个音符的频率。
然后,我们可以写一个函数来解析一个字符串,并根据每个字符播放相应的音符:
```python
def play_music(string):
duration = 60.0 / beats_per_minute # length of each beat in seconds
for char in string:
if char in notes:
frequency = notes[char]
play_sound(frequency * base_frequency, duration)
else:
time.sleep(duration)
```
这个函数使用`notes`字典将每个字符映射到相应的频率。如果字符不在字典中,它将等待一个节拍的时间。
最后,我们可以使用这个函数来播放一段音乐:
```python
music = "C D E C C D E C E F G G F E D C"
play_music(music)
```
这段代码将播放一段简单的旋律。
完整代码如下:
```python
import math
import pyaudio
import time
def play_sound(frequency, duration):
p = pyaudio.PyAudio()
volume = 0.5 # range [0.0, 1.0]
sample_rate = 44100 # number of samples per second
samples = (p.get_sample_size(pyaudio.paFloat32) * sample_rate * duration)
stream = p.open(format=pyaudio.paFloat32,
channels=1,
rate=sample_rate,
output=True)
for i in range(samples):
value = volume * math.sin(2.0 * math.pi * frequency * float(i) / float(sample_rate))
stream.write(value.tostring())
stream.close()
p.terminate()
frequency = 100
while frequency <= 2000:
play_sound(frequency, 0.5)
frequency += 100
beats_per_minute = 120
base_frequency = 440 # A4
notes = {
'C': 261.63,
'D': 293.66,
'E': 329.63,
'F': 349.23,
'G': 392.00,
'A': 440.00,
'B': 493.88
}
def play_music(string):
duration = 60.0 / beats_per_minute # length of each beat in seconds
for char in string:
if char in notes:
frequency = notes[char]
play_sound(frequency * base_frequency, duration)
else:
time.sleep(duration)
music = "C D E C C D E C E F G G F E D C"
play_music(music)
```
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