Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission
Reexamination Certificate
2006-08-22
2006-08-22
Lerner, Martin (Department: 2654)
Data processing: speech signal processing, linguistics, language
Speech signal processing
For storage or transmission
C704S229000, C341S077000
Reexamination Certificate
active
07096180
ABSTRACT:
Methods and apparatuses for encoding speech signals in the presence of interference that accurately establishes a speech signal value subsequent to lost transmission packets. For one embodiment of the present invention, the initial bits of a speech transmission packet are encoded using a PCM encoding scheme and the remaining bits are encoded using a CVSD encoding scheme. Upon encoding, the initial bits of each packet, the instantaneous value of the voltage as derived from CVSD coder/decoder at the transmitter is encoded using PCM coding rather than CVSD coding. At the receiver, each packet is decoded independently using the PCM-encoded bits, rather than the terminal value of a preceding packet, to define a starting value. The PCM encoded bits of a valid packet are used to reestablish the signal value, thus avoiding packet-to-packet error extension in the presence of burst interference.
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