Error protection for multimode speech coders

Details Error protection for multimode speech coders Error protection for multimode speech coders

1995-10-11

1997-06-24

Snyder, Glenn

Excavating

395 209, G06F 1110, H03M 1312

Patent

active

056423683

ABSTRACT:
A method for protecting information bits wherein input data bits, at least some of which are to be protected, are sorted based upon information determined from a subset of the input data bits. An error control coding technique is applied to at least some of the sorted bits. In the preferred embodiment, an input data stream of voice coder bits is separated into arrays of bits. A first array (302) comprises voice coder bits needing error protection, with the bits arranged in order of importance determined by voicing mode. The second array (303) comprises bits that will not be error protected. The bits from the first array are provided to the input of an encoder (304), then the encoded bits are combined (305) with the bits from the second array (303) to form a bit stream.

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patent: 5247579 (1993-09-01), Hardwick
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