关键词: 音频传输，不等保护，信噪比

Abstract: A new method about audio safe transmission based on unequal error protection codes was proposed. Unequal error protection codes provide two levels of error-correcting capabilities: f1 and f2(f1>f2) for the different audio information bit with once codec. If the number of error bits less than or equal to f2 in the decoding process,a common decoding algorithm is adopt, then provides high protection lever with the error-correcting capabilities f1 by computing the syndromes of the sulrcodespace of f2.It's suitable for better audio codec design. Simulation shows that this method improves the security transmission of the audio signal. Under a certain noise the SNR value of the audio signal is obviously advanced and has a good hearing effect

Key words: Audio transmission, Unequal error protection, SNR