The object of this work is to obtain a binary code with an important reduction of the bit rate for speech transmission purposes. This reduction must be carried out in a simple way and giving an exact reproduction of the input signal. In order to make this codification we have considered a 12 bits uniform Quantizer and the signal both with and without preemphasis. A Huffman code has been obtained in both cases considering the voice as a symbol source of 4096 symbols. Due to this number of symbols a special algorithm has been implemented in order to automaticly compute the Huffman codes.