In this paper we describe our work on GSM half-rate coding system for the pan-European digital mobile cellular radio system. The system consists of a speech coder and a channel coder. An overview of the speech coding algorithm is given. The channel coder uses CRC check and a convolutional code. Interleaving is used to randomize the channel bursts. The proposed half-rate codec is implemented with a single TMS320C30. The informal tests (based on MOS score) prove that our speech coder gives higher quality.
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