import struct
import mmap
import scipy.io as sio
f = open('long_wav.bin', 'r+b')
mm = mmap.mmap(f.fileno(), 0)
data = np.array(list(struct.unpack('f' *round(((16000*4*40 ) /4)), mm[:16000*4*40])) )
#sio.savemat('tmp111.mat', {'noise':data})
mm.size()
mm.close()
f.close()