optimize ComputeDecibel in fsmn-vad model by using numpy (#2174)

StevenH

2024-10-26 1254e8aee1e3200acc2b4752c6822bfc1a21b22f

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wget https://isv-data.oss-cn-hangzhou.aliyuncs.com/ics/MaaS/ASR/dep_libs/ffmpeg-N-111383-g20b8688092-linux64-gpl-shared.tar.xz
tar -xvf ffmpeg-N-111383-g20b8688092-linux64-gpl-shared.tar.xz