the standard AMR1 voice activity detection

G.720.1是ITU-T最新制定的语音标准，其主要包括活动话音检测、语音和噪声分类功能，可以适用与宽带和窄带语音。-G.720.1 is a newly developed speech standard ITU-T, which mainly includes a voice activity detection, voice and noise classification function can be applied with both broadband and narrowband