Trellis.viterbi function

Dear all,
since the documentation does not explain the arguments of the function
trellis.viterbi, can you kindly explain to me where have I to insert the
polynomials 133 and 171, the k=7 and the rate 1/2?

My input is an array of 192 int, that must become an array of 96 int
after
the Viterbi decoding.

Thanks,
Simone.

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