def genToneByFreq(rootFreq, dur, partialAmp, partialRatio):
# sc = [0.7, 0.7, 0.7, 0.7, 0.7, 0.7]
# sc = [0.5, 0.7, 0.3, 0.2, 0.1, 0.1]
# sc = [0.5, 0.7, 0.7, 0.5, 0.4, 0.4, 0.5, 0.1, 0.3, 0.1, 0.1, 0.05]
# sc = [0.5]
# for i in range(len(sc)) :
# sc[i] = sc[i]*3
# sc = partialAmp
sin_sig = thinkdsp.SinSignal(freq=rootFreq, amp=partialAmp[0], offset=0)
wave = sin_sig.make_wave(duration=dur, start=0, framerate=11025)
window = makeWindow(len(wave.ys), 100)
wave.window(window)
for i in range(1, len(partialAmp)):
# sin_sig = thinkdsp.SinSignal(freq=rootFreq * ratioArtSpec(i+1), amp=sc[i], offset=0)
sin_sig = thinkdsp.SinSignal(freq=rootFreq * partialRatio[i],
amp=partialAmp[i],
offset=0)
w = sin_sig.make_wave(duration=dur, start=0, framerate=11025)
window = makeWindow(len(wave.ys), 100 - i * 10)
w.window(window)
wave = wave + w
return (wave)
def genToneByFreq(rootFreq, dur, ss):
# sc = [0.7, 0.7, 0.7, 0.7, 0.7, 0.7]
# sc = [0.5, 0.7, 0.3, 0.2, 0.1, 0.1]
# sc = [0.5, 0.7, 0.7, 0.5, 0.4, 0.4, 0.5, 0.1, 0.3, 0.1, 0.1, 0.05]
# sc = [0.5]
# for i in range(len(sc)) :
# sc[i] = sc[i]*3
# sc = partialAmp
sin_sig = thinkdsp.SinSignal(freq=rootFreq, amp=ss.partialAmp[0], offset=0)
wave = sin_sig.make_wave(duration=dur, start=0, framerate=11025)
# window = makeWindow(len(wave.ys),100)
window = makeWindow(len(wave.ys), ss.cutpoint, 1, ss.sustainLevel)
wave.window(window)
l = len(ss.partialAmp)
for i in range(1, l):
# sin_sig = thinkdsp.SinSignal(freq=rootFreq * ratioArtSpec(i+1), amp=sc[i], offset=0)
sin_sig = thinkdsp.SinSignal(freq=rootFreq * ss.partialRatio[i],
amp=ss.partialAmp[i],
offset=0)
w = sin_sig.make_wave(duration=dur, start=0, framerate=11025)
# window = makeWindow(len(wave.ys),100-i*10)
r = 0.3 * ((l - i - 1) / (l - 1)) / l + 0.7
# r = 1
window = makeWindow(len(wave.ys), ss.cutpoint, r, ss.sustainLevel)
w.window(window)
wave = wave + w
return (wave)
def encodeWavFile(message):
"""
returns: .wav file destination to the ecoded message
"""
binNum = ""
encodedWave = thinkdsp.SinSignal(freq=0, amp=0, offset=0).make_wave()
offCount = 0
for letter in message:
for key, value in lettersDict.items():
if letter == value:
binNum = key
count = 0
for num in binNum:
if num == str(1):
signal = thinkdsp.SinSignal(freq=freqsList[count],
amp=1000,
offset=0)
encodedWave += signal.make_wave(start=offCount,
duration=.92)
else:
signal = thinkdsp.SinSignal(freq=freqsList[count],
amp=0,
offset=offCount)
encodedWave += signal.make_wave(start=offCount,
duration=0.92)
count += 1
offCount += 1
encodedWave.play("encodedWave.wav")
return "encodedWave.wav"
def generate_tonal_sig(bits, symbol_len):
transmit = thinkdsp.SinSignal(freq=500, amp=1.5, offset=0)
audio = transmit.make_wave(duration=symbol_len)
for bit in bits:
if bit == 0:
sig = thinkdsp.SinSignal(freq=500, amp=1.5, offset=0)
if bit == 1:
sig = thinkdsp.SinSignal(freq=1500, amp=1.5, offset=0)
new_wav = sig.make_wave(duration=symbol_len)
audio = audio | new_wav
return audio
def window_plot():
"""Makes a plot showing a sinusoid, hamming window, and their product.
"""
signal = thinkdsp.SinSignal(freq=440)
duration = signal.period * 10.25
wave1 = signal.make_wave(duration)
wave2 = signal.make_wave(duration)
ys = numpy.hamming(len(wave1.ys))
window = thinkdsp.Wave(ys, wave1.framerate)
wave2.hamming()
thinkplot.preplot(rows=3, cols=1)
pyplot.subplots_adjust(wspace=0.3,
hspace=0.3,
right=0.95,
left=0.1,
top=0.95,
bottom=0.05)
thinkplot.subplot(1)
wave1.plot()
thinkplot.config(axis=[0, duration, -1.07, 1.07])
thinkplot.subplot(2)
window.plot()
thinkplot.config(axis=[0, duration, -1.07, 1.07])
thinkplot.subplot(3)
wave2.plot()
thinkplot.config(axis=[0, duration, -1.07, 1.07], xlabel='time (s)')
thinkplot.save(root='windowing2')
def mix_cosines():
"""Plots three periods of a mix of cosines.
"""
# create a SumSignal
cos_sig = thinkdsp.CosSignal(freq=440, amp=1.0, offset=0)
sin_sig = thinkdsp.SinSignal(freq=880, amp=0.5, offset=0)
mix = sin_sig + cos_sig
# create a wave
wave = mix.make_wave(duration=1.0, start=0, framerate=11025)
print('Number of samples', len(wave))
print('Timestep in ms', 1000 / wave.framerate)
assert len(wave) == wave.framerate
# select a segment
period = mix.period
segment = wave.segment(start=0, duration=period * 3)
# plot the segment
thinkplot.preplot(1)
segment.plot()
thinkplot.Save(root='sounds4',
xlabel='Time (s)',
axis=[0, period * 3, -1.55, 1.55],
formats=FORMATS,
legend=False)
def mix_cosines():
"""Demonstrates methods in the thinkdsp module.
"""
# create a SumSignal
cos_sig = thinkdsp.CosSignal(freq=440, amp=1.0, offset=0)
sin_sig = thinkdsp.SinSignal(freq=880, amp=0.5, offset=0)
mix = sin_sig + cos_sig
# create a wave
wave = mix.make_wave(duration=0.5, start=0, framerate=11025)
print 'Number of samples', len(wave.ys)
print 'Timestep in ms', 1.0 / 11025 * 1000
# select a segment
period = mix.period
segment = wave.segment(start=0, duration=period*3)
# plot the segment
segment.plot()
thinkplot.Save(root='example1',
xlabel='time (s)',
axis=[0, period*3, -1.55, 1.55])
# write the whole wave
wave.normalize()
wave.apodize()
wave.write(filename='example1.wav')
# play the wave
thinkdsp.play_wave(filename='example1.wav', player='aplay')
def main():
numpy.set_printoptions(precision=3, suppress=True)
test_dct()
return
synthesize_example()
return
test_synthesize(fshift=0, tshift=0)
test_synthesize(fshift=0.5, tshift=0.5)
return
cos_sig = thinkdsp.CosSignal(freq=1)
wave = cos_sig.make_wave(duration=1, start=0, framerate=4)
print wave.ys
dct = scipy.fftpack.dct(wave.ys, type=2)
print dct
cos_trans = wave.cos_transform()
xs, ys = zip(*cos_trans)
print ys
return
framerate = 4000
cos_sig = (thinkdsp.CosSignal(freq=440) + thinkdsp.SinSignal(freq=660) +
thinkdsp.CosSignal(freq=880))
wave = cos_sig.make_wave(duration=0.5, start=0, framerate=framerate)
res = wave.cos_transform()
for index in range(3):
plot(res, index)
def generate_random_wave(complexity):
f = np.random.randint(1000, size=complexity)
a = np.random.randint(100, size=complexity)
rand_wave = 0
for i in range(complexity):
sin_sig = thinkdsp.SinSignal(freq=random.randint(300, 2000) * np.random.randn() ** 2,
amp=random.randint(100, 1000) * np.random.randn() ** 2, offset=0)
rand_wave += sin_sig.make_wave(duration=0.5, start=0, framerate=44100)
return rand_wave
def waveform(freq, btn_input):
if btn_input == 1:
signal = thinkdsp.SinSignal(freq)
if btn_input == 2:
signal = thinkdsp.SquareSignal(freq)
if btn_input == 3:
signal = thinkdsp.TriangleSignal(freq)
wave = signal.make_wave(framerate=samplingFreq)
return wave
def make_wave(offset):
"""Makes a 440 Hz sine wave with the given phase offset.
offset: phase offset in radians
returns: Wave objects
"""
signal = thinkdsp.SinSignal(freq=440, offset=offset)
wave = signal.make_wave(duration=0.5, framerate=10000)
return wave
def test2():
cos_sig = thinkdsp.CosSignal(freq=440, amp=1.0, offset=0)
sin_sig = thinkdsp.SinSignal(freq=800, amp=0.5, offset=0)
mix = cos_sig + sin_sig
wave = mix.make_wave(duration=2, start=0, framerate=16000)
wave.normalize() # 归一化
wave.write(filename='play3.wav')
wave.apodize() # 渐入渐出
wave.write(filename='play4.wav')
def plot_sinusoid(duration=0.00685):
"""Plots three cycles of a 440 Hz sinusoid.
duration: float
"""
signal = thinkdsp.SinSignal(440)
wave = signal.make_wave(duration, framerate=44100)
wave.plot()
thinkplot.Save(root='sinusoid1',
xlabel='time (s)',
axis=[0, duration, -1.05, 1.05])
def signal(offset):
cos_sig = thinkdsp.CosSignal(freq=1.0, amp=1.0, offset=offset)
sin_sig = thinkdsp.SinSignal(freq=1.0, amp=1.0, offset=offset)
cos_wave = cos_sig.make_wave(duration=0.5, start=0, framerate=8000)
sin_wave = sin_sig.make_wave(duration=0.5, start=0, framerate=8000)
period = sin_sig.period
cos_seg = cos_wave.segment(start=0, duration=period * 5)
sin_seg = sin_wave.segment(start=0, duration=period * 5)
sin_seg.plot()
tp.show()
cos_seg.plot()
tp.show()
def discontinuity(num_periods=30, hamming=False):
"""Plots the spectrum of a sinusoid with/without windowing.
num_periods: how many periods to compute
hamming: boolean whether to apply Hamming window
"""
signal = thinkdsp.SinSignal(freq=440)
duration = signal.period * num_periods
wave = signal.make_wave(duration)
if hamming:
wave.hamming()
print(len(wave.ys), wave.ys[0], wave.ys[-1])
spectrum = wave.make_spectrum()
spectrum.plot(high=60)
def make_sine():
framerate = 8000
signal = thinkdsp.SinSignal(440, amp=1.0, offset=0)
duration = signal.period
wave = signal.make_wave(duration=duration, start=0, framerate=framerate)
print 'Number of samples', len(wave.ys)
print 'Timestep in ms', 1.0 / framerate * 1000
# plot the segment
#wave.plot()
#thinkplot.Show(
# xlabel='time (s)',
# axis=[0, duration, -1.05, 1.05])
print_c_wave(wave)
def test1():
cos_sig = thinkdsp.CosSignal(freq=440, amp=1.0, offset=0)
sin_sig = thinkdsp.SinSignal(freq=880, amp=0.5, offset=0)
mix = cos_sig + sin_sig
wave = mix.make_wave(duration=10, start=0, framerate=16000)
wave.normalize() # 归一化
wave.apodize() # 渐入渐出
wave.plot()
plt.show()
wave.write(filename='output.wav')
# 显示原波形
violin_wave = thinkdsp.read_wave('output.wav')
segment = violin_wave.segment(start=0, duration=2 / 440)
segment.plot()
plt.show()
# 频谱
spectrum = violin_wave.make_spectrum()
spectrum.plot()
plt.show()
# 低通
spectrumlow = spectrum.copy()
spectrumlow.low_pass(cutoff=600, factor=0.01)
spectrumlow.plot()
plt.show()
violin_wave = spectrumlow.make_wave()
segment = violin_wave.segment(start=0, duration=2 / 440)
segment.plot()
plt.show()
# 高通
spectrumhigh = spectrum.copy()
spectrumhigh.high_pass(cutoff=600, factor=0.01)
spectrumhigh.plot()
plt.show()
violin_wave = spectrumhigh.make_wave()
segment = violin_wave.segment(start=0, duration=2 / 440)
segment.plot()
plt.show()
def gen_wav():
#cos_sig = thinkdsp.CosSignal(freq=440, amp=1.0, offset=0)
sin_sig = thinkdsp.SinSignal(freq=880, amp=0.5, offset=0)
#mix = cos_sig + sin_sig;
mix = sin_sig
wave = mix.make_wave(duration=10, start=0, framerate=2000000)
wave.normalize() # 归一化
wave.apodize() # 渐入渐出
#wave.plot()
#plt.show()
segment = wave.segment(start=0, duration=2/440)
segment.plot()
plt.show()
# 频谱
spectrum = wave.make_spectrum()
spectrum.plot()
plt.show()
wave.write(filename=sys.argv[1])
spectrumGuitar = waveguitar.make_spectrum() spectrumGuitar.plot() spectrumSax = wavesax.make_spectrum() spectrumSax.plot(high=6000) spectrumGuitar = waveguitar.make_spectrum() spectrumGuitar.plot(high=1000) spectrumSax.peaks()[:10] spectrumGuitar.peaks()[:10] cos_sig_sax = thinkdsp.CosSignal(freq=492, amp=1.0, offset=0) cos_sig_guitar = thinkdsp.CosSignal(freq=401, amp=1.0, offset=0) cos_sig = cos_sig_sax + cos_sig_guitar cos_sig.plot() thinkplot.config(xlabel='Time (s)') sin_sig_sax = thinkdsp.SinSignal(freq=492, amp=1.0, offset=0) sin_sig_guitar = thinkdsp.SinSignal(freq=401, amp=1.0, offset=0) sin_sig = sin_sig_sax + sin_sig_guitar sin_sig.plot() thinkplot.config(xlabel='Time (s)') wave2 = cos_sig.make_wave(duration=1) wave2.apodize() wave2.make_audio() wave3 = sin_sig.make_wave(duration=1) wave3.apodize() wave3.make_audio()
import os
import thinkdsp as dsp
import matplotlib.pyplot as plt
from winsound import PlaySound
plt.rcParams['font.sans-serif'] = ['KaiTi'] # 指定默认字体
plt.rcParams['axes.unicode_minus'] = False # 解决保存图像是负号'-'显示为方块的问题
def play(file, flags):
print('Now play ' + file)
PlaySound(file, flags)
print('end')
sin = dsp.SinSignal(freq=400, amp=1.0)
cos = dsp.CosSignal(freq=1000, amp=0.5)
signal = cos + sin
plt.subplot(121)
plt.title("复合信号")
signal.plot()
wave = signal.make_wave(duration=1)
spectrum = wave.make_spectrum()
plt.subplot(122)
plt.title("复合信号频谱")
spectrum.plot(high=2000)
wave.normalize()
wave.write("复合信号.wav")
play("复合信号.wav", flags=1)
plt.show()
import thinkdsp import matplotlib.pyplot as pyplot pyplot.gcf().clear() cos_sig = thinkdsp.SinSignal(440, 1, 0) sin_sig = thinkdsp.SinSignal(880, 1, 0) mix = cos_sig + sin_sig wave = mix.make_wave(100, 0, 11025) print(wave.ys[0]) print(wave.ys[1]) print(wave.ys[2]) print(wave.ys[3]) print(wave.ys[4]) print(wave.ys[5]) print(wave.ys[6]) print(wave.ys[7]) wave.plot() pyplot.show() period = mix.period segment = wave.segment(0, 3 * period) segment.plot()
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Thu Aug 2 19:37:36 2018
@author: MikeNagler
"""
import thinkdsp
import numpy as np
fundamental = 110
freqs = np.arange(110, 1100, 110)
amps = 1/freqs**2
mix = sum(thinkdsp.SinSignal(freq=f, amp=a) for f, a in zip(freqs, amps))
wave = mix.make_wave()
segment = wave.segment(duration=0.01)
spectrum = wave.make_spectrum()
spectrum.plot()
wave.write(filename='temp.wav')
thinkdsp.play_wave(filename='temp.wav', player='afplay')
def make_sine(offset):
signal = thinkdsp.SinSignal(freq=440, offset=offset)
wave = signal.make_wave(duration=0.5, framerate=10000)
return wave
import thinkdsp import matplotlib.pyplot as plt cos_signal = thinkdsp.CosSignal(freq=440, amp=1.0, offset=0) sin_sigal = thinkdsp.SinSignal(freq=880, amp=0.5, offset=0) mix = sin_sigal + cos_signal wave = mix.make_wave(duration=0.5, start=0, framerate=11025) wave.plot() plt.show()
# This file shows how to generate a sine wave using the ThinkDSP library. import sys sys.path.insert(0, 'ThinkDSP/code/') import thinkdsp import matplotlib.pyplot as pyplot # Generate wave sin = thinkdsp.SinSignal(freq=400, amp=0.5) # Where freq is the frequency and amp is the amplitude of the sine wave wave = sin.make_wave(duration=2, start=0, framerate=44100) # Turn the sin wave into an audio wave # Play wave wave.play() # Plot wave period = sin.period segment = wave.segment(start=0, duration=period*3) segment.plot() pyplot.show()
# ### Exercise
#
# Synthesize a compound signal by creating SinSignal and CosSignal
# objects and adding them up. Evaluate the signal to get a Wave,
# and listen to it. Compute its Spectrum and plot it.
# What happens if you add frequency
# components that are not multiples of the fundamental?
# ### Solution
#
# Here are some arbitrary components I chose. It makes an interesting waveform!
# In[15]:
signal = (thinkdsp.SinSignal(freq=400, amp=1.0) +
thinkdsp.SinSignal(freq=600, amp=0.5) +
thinkdsp.SinSignal(freq=800, amp=0.25))
signal.plot()
# We can use the signal to make a wave:
# In[16]:
wave2 = signal.make_wave(duration=1)
wave2.apodize()
# And here's what it sounds like:
# In[17]:
import thinkdsp
import matplotlib.pyplot as plt
from winsound import PlaySound
plt.rcParams['font.sans-serif'] = ['KaiTi'] # 指定默认字体
plt.rcParams['axes.unicode_minus'] = False # 解决保存图像是负号'-'显示为方块的问题
def play(file, flags):
print('Now play ' + file)
PlaySound(file, flags)
print('end')
sin = thinkdsp.SinSignal(freq=400, amp=1.0)
cos = thinkdsp.CosSignal(freq=1000, amp=0.5)
signal = cos + sin
plt.subplot(121)
plt.title("复合信号")
signal.plot()
wave = signal.make_wave(duration=1)
spectrum = wave.make_spectrum()
plt.subplot(122)
plt.title("复合信号频谱")
spectrum.plot(high=2000)
wave.normalize()
wave.write("复合信号.wav")
play("复合信号.wav", flags=1)
plt.show()
# ## solution 3 # In[30]: import thinkdsp as d from IPython.display import Audio import thinkplot as t from IPython.display import Audio # In[31]: m=d.SinSignal(freq=523,amp=3,offset= 0) n=d.SinSignal(freq=554,amp=3,offset=0) o=d.SinSignal(freq=587,amp=4,offset=0) p=d.SinSignal(freq=622,amp=5,offset=0) q=d.SinSignal(freq=659,amp=5,offset=0) r=d.SinSignal(freq=698,amp=5,offset=0) s=d.SinSignal(freq=740,amp=5,offset=0) t=d.SinSignal(freq=780,amp=5,offset=0) u=d.SinSignal(freq=831,amp=5,offset=0) v=d.SinSignal(freq=880,amp=5,offset=0) w=d.SinSignal(freq=932,amp=5,offset=0) x=d.SinSignal(freq=988,amp=5,offset=0) y=d.SinSignal(freq=1047,amp=5,offset=0) # In[34]:
import sys sys.path.insert(0, 'ThinkDSP/code/') import thinkdsp import matplotlib.pyplot as pyplot # Generate wave sin1 = thinkdsp.SinSignal(freq=400, amp=0.5) sin2 = thinkdsp.SinSignal(freq=800, amp=0.3) mix = sin1 + sin2 # Notice here how 2 waves can be added together wave = mix.make_wave(duration=2, start=0, framerate=44100) # Play wave wave.play() # Plot spectrum of wave spectrum = wave.make_spectrum() spectrum.plot() pyplot.show()
t3 = [np.sin(7*np.pi*t)*00 for t in np.linspace(0,4, 1000)] S=[i+J+K for i,J,K in zip(t1,t2,t3)] B=np.fft.fft(S) plt.plot(abs(B[0])) plt.plot(B) plt.show() """Create a music of your choice and export the audio in .wav format.""" import thinkdsp as d from IPython.display import Audio w1=d.SinSignal(freq=240,amp=5,offset=0) w2=d.SinSignal(freq=270,amp=5,offset=0) w3=d.SinSignal(freq=300,amp=5,offset=0) w4=d.SinSignal(freq=320,amp=5,offset=0) w5=d.SinSignal(freq=360,amp=5,offset=0) w6=d.SinSignal(freq=400,amp=5,offset=0) w7=d.SinSignal(freq=450,amp=5,offset=0) sa_time=w1.make_wave(duration=1.5,start=0,framerate=11000) re_time=w2.make_wave(duration=1.5,start=1.5,framerate=11000) ga_time=w3.make_wave(duration=1.5,start=3,framerate=11000) ma_time=w4.make_wave(duration=1.5,start=4.5,framerate=11000) pa_time=w5.make_wave(duration=1.5,start=6,framerate=11000) dha_time=w6.make_wave(duration=1.5,start=7.5,framerate=11000) ni_time=w7.make_wave(duration=1.5,start=9,framerate=11000)
