Hi,

I have a quite specific question. Perhabs somebody with technical insight
can help me:

The EFR algorithm converts 20 ms. of voice (which would be 160 bytes in
plain G711 encoding) into 244 bits = 30.5 bytes.
In the GSM specification however, two additional bytes are added. One byte
is used to protect the 65 most important bits with a CRC, the other byte is
used to to add redundancy for 4 selected bits.
These 4 bits are transmitted in 12 bits repeating each bit two times.

OK - this was the information. Now the question:

How should these redundant bits be treated? In my world redundancy means
identical. However, I have seen the T68i from SonyEricsson to produce a
strange pattern - for instance 101 or 110. I think the only valid pattern
should be 111 or 000.
Does anybody have a comment? - Or perhabs point me to the right group if
there's a better forum for my question.

Kind regards and thanks in advance
Kim Hyldgaard