def sing_base(length,freq,z=1.0):
voxA=[]
hc=1.0
freq=float(freq)
while hc*freq<18000:
hf=hc*freq
# at higher frequencies there is less need to
# richen the sound so do only one pass of creating the
# waves, but double the volume of each one by two to
# avoid filtering effects
if freq<5000:
x=2
y=1.0
else:
x=1
y=2.0
for c in range(0,x):
vol = (1.0/hc)**z
# cut of at -60 db
if vol>0.25e-06:
vol*=y
voxA.append(sf.NumericVolume(sf.PhasedTableSineWave(length,hf+random.random()*10.0,random.random()),vol))
voxA.append(sf.NumericVolume(sf.PhasedTableSineWave(length,hf-random.random()*10.0,random.random()),vol))
voxA.append(sf.NumericVolume(sf.PhasedTableSineWave(length,hf+random.random()*10.0,random.random()),vol))
voxA.append(sf.NumericVolume(sf.PhasedTableSineWave(length,hf-random.random()*10.0,random.random()),vol))
hc+=1
vox=mix(voxA)
vox=sf.Clean(vox)
vox=polish(sf.FixSize(vox),freq)
return sf.FixSize(vox)
def trumpet_base(length,freq,z=1.0):
voxA=[]
hc=1.0
freq=float(freq)
while hc*freq<20000:
hf=hc*freq
voxA.append(sf.NumericVolume(sf.PhasedSineWave(length,hf,random.random()),(1.0/hc)**z))
hc+=1
vox=mix(voxA)
vox=sf.Clean(vox)
vox=polish(sf.FixSize(vox),freq)
return sf.FixSize(vox)
def stretched_bass(length,freq,z=1.0,s=1.0,d=0.0,at=0):
freq=float(freq)
hf=freq
hc=1.0
if at==0:
at=length*0.9
vox=sf.Silence(length)
while hf<20000:
v=(1.0/hc)**z
env=sf.NumericShape((0,v),(at,v-(d**hc-1.0)),(length,v-(d**hc-1.0)))
vox=mix(
sf.Multiply(
sf.PhasedSineWave(length,hf,random.random()),
env
),
vox
)
hf+=freq*s
hc+=1
vox=sf.Clean(vox)
vox=polish(sf.FixSize(vox),freq)
return sf.FixSize(vox)
