Partial redundancy encoding of speech
OwnerErik Ekudden, Johan Sjoberginventors
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Abstract
A method and apparatus for partial redundancy encoding of a speech data packet. The bits in the speech data packet are sorted according to a predetermined error sensitivity characteristic, order, level or degree of importance. Only those bits in the packet which are considered to be most error sensitive are protected by redundant transmission. A partial set of redundant bits of the previously transmitted packets are included with the data bit for current packet. The redundant bits are used at the receiver side to reconstruct damaged packets. By using only the most sensitive bits for redundancy, the additional required and width may be limited.
Claims20
A method of transmitting encoded speech data in a telecommunications network, said encoded speech data being divided into a plurality of respective encoded speech frames, the method comprising:
- sorting at least one of said plurality of speech frames having respective encoded speech data therein, said respective encoded speech data having a predetermined error sensitivity characteristic associated therewith;
- generating partial redundant data corresponding to said sorted encoded speech data within said at least one speech frame;
- and
- transmitting a data packet containing said sorted encoded speech data and said partial redundant data.
A system for communicating encoded speech data in a telecommunications network, said encoded speech data being divided into a plurality of respective speech frames, the system comprising:
- a codec for sorting at least one of said plurality of speech frames having respective encoded speech data therein, said speech data having a predetermined error sensitivity characteristic associated therewith;
- a partial redundancy generator for generating partial redundant data corresponding to said sorted encoded speech data within said at least one speech frame;
- and
- a transmitter for transmitting a data packet containing said sorted encoded speech data and said partial redundant data.
A codec for sorting data over a communications link, said codec comprising:
- sorting means for sorting at least one of a plurality of speech frames having encoded speech data therein, said respective encoded speech data having a predetermined error sensitivity characteristic associated therewith;
- and
- generating means for generating partial redundant data corresponding to said sorted encoded speech data within said at least one speech frame.
Dependencies are inferred from the claim text.