A few suggestions: The analog front end to the ADC is critical. In addition to proper impedance matching and voltage level settings, you are going to want automatic gain control and bandpass filtering on the frequencies you want to record. 8 kHz is a very low sampling rate for audio. You should not expect anything more than telephone voice quality. Record the output from your mic/AFE on something with much higher quality in order to test your input stage. Feed the ADC with a high quality input source to see what the low bandwidth recording is like under optimal input signal conditions. -p. On Sat, Jul 26, 2014 at 7:29 PM, yamanoor sairam wr= ote: > Hi, > > I recently got this breakout board from Spark Fun and connected it to a m= icrocontroller. I read the ADC values @ 8 kHz and recorded it to a WAV file= .. > > I played the WAV file and it turns out that the audio content is clear i.= e I am able to listen to things I say in front of the microphone but I find= my voice to be really feeble. It is better if I keep the microphone closer= to me. According to the specs mentioned in the product page, the gain of t= he board is 100. I am trying to learn how can I improve the audio quality t= hat is recorded using a microcontroller. > > I am not looking for an off-the-shelf solution but prototype things and l= earn in this process. I am trying to learn to build a system that records t= he audio in a room with some good quality. I don't know how to experiment w= ith the recorded audio files to determine where I stand now and improve the= audio levels in the file. I did some search and the web presents a lot of = solutions with opamps and a myriad of calculations with opamp circuits etc.= My question is: How do I record audio in a room that is actually audible? = I want to improve on the existing setup. Currently the microphone board's o= pamp output is being fed directly to the ADC. > > Thanks, > Sai > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .