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US 7,117,156 B1Granted
Method and apparatus for performing packet loss or frame erasure concealment
AssigneeAT&T Corp.
InventorDavid A. Kapilow
Life of this patent
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AssigneeAT&T Corp.
InventorDavid A. Kapilow
Estimating the term…
The invention concerns a method and apparatus for performing packet loss or Frame Erasure Concealment (FEC) for a speech coder that does not have a built-in or standard FEC process. A receiver with a decoder receives encoded frames of compressed speech information transmitted from an encoder. A lost frame detector at the receiver determines if an encoded frame has been lost or corrupted in transmission, or erased. If the encoded frame is not erased, the encoded frame is decoded by a decoder and a temporary memory is updated with the decoder's output. A predetermined delay period is applied and the audio frame is then output. If the lost frame detector determines that the encoded frame is erased, a FEC module applies a frame concealment process to the signal. The FEC processing produces natural sounding synthetic speech for the erased frames.
In a process for concealing the effect of missing speech information on generated speech, said speech information having been compressed and transmitted in packets to a receiver which does not receive one or more of such packets, a method for concealing the discontinuity between synthesized speech and decoded speech, the method comprising the steps of:
Dependencies are inferred from the claim text.