mic_data.pcm is the original mic data. encoder_mic_data.pcm is the encoded mic data by G711A. test step: (1)Copy the mic_data.pcm and encoder_mic_data.pcm to sdcard. (2)Send AT command "g711_encoder_test" to excute encoder test case, The case will output result to out_encoder_data.pcm. (3)Send AT command "g711_decoder_test" to excute decoder test case, The case will output result to out_decoder_data.pcm. (4)If encoder_mic_data.pcm is the same as out_encoder_data.pcm, the encoder test case pass. (5)If mic_data.pcm is the same as out_decoder_data.pcm, the decoder test case pass.