Digital encoder and decoder synchronization in the presence of l

Details Digital encoder and decoder synchronization in the presence of l Digital encoder and decoder synchronization in the presence of l

1986-02-28

1988-02-16

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 60, H04J 324, H04Q 1104

Patent

active

047260190

ABSTRACT:
In a speech signal being reconstructed from digital samples, artificial gaps caused by discarded late packets are minimized by holding state varibales constant in a decoder used to reconstruct the speech signal. The decoder state variables are held constant from the end of the last previous packet information field for up to a prescribed interval. Upon arrival of the "late" packet, the decoder passes from the hold variables state to its normal operating state and reading out of samples from the packet information field is initiated immediately. Subsequent packets in the information spurt are concatenated to the late arriving packet.

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