H - Electricity – 04 – J
Patent
H - Electricity
04
J
363/11
H04J 3/02 (2006.01) H04J 3/17 (2006.01)
Patent
CA 1155978
APPARATUS TO REDUCE THE EFFECT OF A MID-TALKSPURT FREEZE-OUT Abstract In reconstructing the analog waveform from a syllabically companded delta modulated digital signal transmitted over a TDMA communication channel operating at near its maximum channel capacity, the noise-created in a mid- talkspurt freeze-out is greatly reduced by interpolating the amplitude of the waveform during the freeze-out at the receiver as that of the waveform in the previous period. This makes the quality of voice transmissions in the face of freeze-outs substantially better than prior art techniques which induce background noise during freeze-outs without the necessity of trans- mitting a voice activity compression (VAC) mask to control the operation of the interpolation apparatus in the receiver. The interpolation occurs for the first 15 msec sampling period following either a freeze-out or a true VAC operation. The interpolation operation is supplied only once so that if two or more consecutive sampling periods occur at the receiver where no channels are received for a particular voice port, the background noise is injected into the voice port. This prevents the uncontrolled repetition of the interpolation at the end of a talkspurt. MA9-78-014
365906
Fennel John W. Jr.
Hallett Robert J.
Head Stanley M.
Melas Constantine M.
International Business Machines Corporation
Saunders Raymond H.
LandOfFree
Apparatus to reduce the effect of a mid-talkspurt freeze-out does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus to reduce the effect of a mid-talkspurt freeze-out, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus to reduce the effect of a mid-talkspurt freeze-out will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-832077