Method and device for preprocessing an acoustic signal upstream

Details Method and device for preprocessing an acoustic signal upstream Method and device for preprocessing an acoustic signal upstream

1995-06-05

1997-07-01

MacDonald, Allen R.

395 21, 395 23, 395 229, 395 223, G10L 900

Patent

active

056446799

ABSTRACT:
The input acoustic signal is subjected to high-pass filtering. The energy of the high-pass filtered signal is compared with that of the unfiltered signal in order to determine a state of the signal from among a first state for which the energy of the high-pass filtered signal is above a predetermined fraction of the energy of the unfiltered signal and a second state for which the energy of the high-pass filtered signal is below the predetermined fraction of the energy of the unfiltered signal. The high-pass filtered signal subjected to pre-emphasis of the high frequencies is addressed to the input of the coder when the signal is in its second state.

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