#!/usr/bin/env python
# coding: utf-8

# In[1]:


get_ipython().run_line_magic('matplotlib', 'inline')

import numpy as np
import matplotlib.pyplot as plt


# ## 請安裝
# 
#     conda install pyaudio

# In[2]:


import pyaudio


# In[3]:


p = pyaudio.PyAudio()


# In[4]:


volume = 0.5     # range [0.0, 1.0]
fs = 44100       # sampling rate, Hz, must be integer
duration = 1.0   # in seconds, may be float
f = 440.0        # sine frequency, Hz, may be float


# In[5]:


# generate samples, note conversion to float32 array
samples = (np.sin(2*np.pi*np.arange(fs*duration)*f/fs)).astype(np.float32).tobytes()


# In[6]:


# for paFloat32 sample values must be in range [-1.0, 1.0]
stream = p.open(format=pyaudio.paFloat32,
                channels=1,
                rate=fs,
                output=True)


# In[7]:


stream.write(samples)


# In[8]:


stream.stop_stream()
stream.close()


# In[9]:


p.terminate()


# In[11]:


len(np.sin(2*np.pi*np.arange(fs*duration)*f/fs))


# In[13]:


t = np.linspace(0, 1, fs)


# In[22]:


y = np.sin(2*np.pi*f*t).astype(np.float32)


# In[23]:


plt.plot(t, y)
plt.xlim(0, 0.01)


# In[24]:


samples = y.tobytes()


# In[26]:


p = pyaudio.PyAudio()
stream = p.open(format=pyaudio.paFloat32,
                channels=1,
                rate=fs,
                output=True)


# In[27]:


stream.write(samples)


# In[28]:


stream.stop_stream()
stream.close()


# In[29]:


p.terminate()