def sinus(freq): # return a 1-second sine wave
from math import sin, pi
factor = 2.0*pi*float(freq)/float(RATE)
list = range(RATE)
for i in list:
list[i] = int(sin(float(i) * factor) * 127.0)
return audio.num2chr(list)
def softclip(s):
if '\177' not in s and '\200' not in s:
return s
num = audio.chr2num(s)
extremes = (-128, 127)
for i in range(1, len(num)-1):
if num[i] in extremes:
num[i] = (num[i-1] + num[i+1]) / 2
return audio.num2chr(num)
def unbias(s):
if not s: return s
a = audio.chr2num(s)
sum = 0
for i in a: sum = sum + i
bias = (sum + len(a)/2) / len(a)
print 'Bias value:', bias
if bias:
for i in range(len(a)):
a[i] = a[i] - bias
s = audio.num2chr(a)
return s
def stretch(s, a, b): y = audio.chr2num(s) m = len(y) out = [] n = m * b / a # i, j will walk through y and out (step 1) # ib, ja are i*b, j*a and are kept as close together as possible i, ib = 0, 0 j, ja = 0, 0 for j in range(n): ja = ja+a while ib < ja: i = i+1 ib = ib+b if i >= m: break if ib == ja: out.append(y[i]) else: out.append((y[i]*(ja-(ib-b)) + y[i-1]*(ib-ja)) / b) return audio.num2chr(out)
def stretch(s, a, b):
y = audio.chr2num(s)
m = len(y)
out = []
n = m * b / a
# i, j will walk through y and out (step 1)
# ib, ja are i*b, j*a and are kept as close together as possible
i, ib = 0, 0
j, ja = 0, 0
for j in range(n):
ja = ja + a
while ib < ja:
i = i + 1
ib = ib + b
if i >= m:
break
if ib == ja:
out.append(y[i])
else:
out.append((y[i] * (ja - (ib - b)) + y[i - 1] * (ib - ja)) / b)
return audio.num2chr(out)
# i, j will walk through y and out (step 1)
# ib, ja are i*b, j*a and are kept as close together as possible
i, ib = 0, 0
j, ja = 0, 0
for j in range(n):
ja = ja+a
while ib < ja:
i = i+1
ib = ib+b
if i >= m:
break
if ib = ja:
out.append(y[i])
else:
out.append((y[i]*(ja-(ib-b)) + y[i-1]*(ib-ja)) / b)
return audio.num2chr(out)
def sinus(freq): # return a 1-second sine wave
from math import sin, pi
factor = 2.0*pi*float(freq)/float(RATE)
list = range(RATE)
for i in list:
list[i] = int(sin(float(i) * factor) * 127.0)
return audio.num2chr(list)
def softclip(s):
if '\177' not in s and '\200' not in s:
return s
num = audio.chr2num(s)
extremes = (-128, 127)
for i in range(1, len(num)-1):