Patent
1992-05-28
1996-07-16
MacDonald, Allen R.
395 223, 395 232, G10L 900
Patent
active
055375090
ABSTRACT:
A digital discontinuous cellular communication system has a transmitter that transmits two frames of data following detection of voice inactivity. A receiver includes a comfort noise generator that uses the two frames of data to output noise to the speaker during period of voice inactivity. The comfort noise generator includes synthesis codebook with samples scaled by actual background noise and excitation codebook with samples filtered and scaled by the background noise that are combined to produce comfort noise having attributes and loudness level of the received background noise prior to interruption of transmission. The scaled signals are weighted to vary the loudness level and spectral attributes.
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McCarthy Brian M.
Swaminathan Kumar
Denson-Low Wanda
Hughes Electronics
Lindeen III Gordon R.
MacDonald Allen R.
Sartori Michael
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