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#!/usr/bin/python
#####################################
# spectrum example
#
# VL, 01/07
from sndobj import *
from Tkinter import *
import array
import display
# window size, refresh interval, norm factor
# highest frequency of display
window_size = 300
time_interval = 0.1
norm = 32768.0/10
highest = 10000
# display callback
def callb(data):
re = array.array('f')
im = array.array('f')
fft = data[0]
disp = data[1]
sr = fft.GetSr()
end = int(fft.GetFFTSize()*2*highest/sr)
for i in range(0,end,2):
re.append(fft.Output(i)/norm)
im.append(fft.Output(i+1)/norm)
if not disp.error:
disp.draw(re,im,(sr/fft.GetHopSize())*time_interval)
# SndObj chain and process thread
win = HammingTable(1024,0.5)
thread = SndThread()
inp = SndRTIO(1, SND_INPUT)
sig = SndIn(inp, 1)
fft = FFT(win,sig);
# display object
disp = display.Spectrum(Tk(), window_size, thread.ProcOff, "red", "blue")
dat = (fft,disp)
# thread set-up
thread.SetProcessCallback(callb, dat)
thread.AddObj(inp, SNDIO_IN)
thread.AddObj(sig)
thread.AddObj(fft)
thread.ProcOn()
# run the display
disp.mainloop()
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