What is the fine-grained topic of the following text: A "joint source-channel coding" solution on TWELP 1200 bps vocoder base and FEC 400 bps as UEP-RCPC (Unequal Error Protection Rate Compatible Punctured Convolution) code provides reliable protection of the bits strictly in accordance with their sensitivity to errors. Only return the topic.
Joint source-channel coding solution on TWELP 1200 bps vocoder with UEP-RCPC code