卫星传送中音频信号解码故障的检测与分析

Detection and Analysis of Audio Signal Decoding Fault in Satellite Transmission

高清电视信号通过卫星传输时,图像伴音中无规律地出现类似"啪啪"的声音。经过分析与测试得出结论 :高清信号随着传输电缆长度的增加,信号幅度不断衰减,当信号幅度衰减到编码器的输入信号门限电平以下时,嵌入音频信号的误码率增大,造成音频信号在解码时产生错误。

There are some irregular noises which sound like ＂papa＂ among the audio when HDTV signals transfer via satellite. After analyses and tests, we get a conclusion that the longer transmission cable is, the more signal attenuation we have. When the HDTV signal decreases lower than the input signal threshold level of encoder, the bit error rate of embedded audio signal increases which will cause the error occurred during audio signal decoding.