I am facing problem for recording my original voice into JM60 SD card.
Currently i am using JM60 ADC at 128us(7.8khz) to sampling 8bit data into my SD card as wav file. But when i playback the voice file, i found the recorded voice is different with my original voice which become more weightily.
I have attached my original voice, recorder voice, and filtering circuit before the voice data into the JM60 ADC.
Anyone can advice me on the above issue?Is there any wrong on the filtering circuit?