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录制的G711文件都是噪音



请教一下,我使用的是dm368的EVB,我想录制G711的音频文件,DRV_audioRead 读取数据后encode成G711结果生成的文件有非常大的噪音,但是又能分辨出来确实有正确地音频数据。希望能帮忙分析一下可能的原因。谢谢