随笔札记——sox除燥

合并一段噪声原始数据备用：

ffmpeg -i zaoying-HCGQ000001-HCZ02-11.flv -i zaoying-HCGQ000001-HCZ02-12.flv -i zaoying-HCGQ000001-HCZ02-13.flv -i zaoying-HCGQ000001-HCZ02-14.flv -i zaoying-HCGQ000001-HCZ02-15.flv -i 1-pull.aac -i 2-pull.aac  -filter_complex '[0:0] [1:0] [2:0] [3:0] [4:0] [5:0] [6:0] concat=n=7:v=0:a=1 [a]' -map [a] noise.wav

利用sox分析噪声数据：

sox noise.wav -n noiseprof noise.prof

除燥：

sox raw.wav  clraw.wav noisered noise.prof 0.5

降噪等级（取值范围0-1，默认0.5）