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Interfacing microphone with PC through microcontroller

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Kaleborg

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Hello.

I understand that i connect a microphone with an ADC input of the microcontroller(probably also through some sort of low pass filter as well) but then I need to send this digitized signal to the PC. And this is my problem because I'm not sure what do I have to do with this data on my PC in order to be able to play it on PC. Should I use some sort of decoding like MP3 or are there some simpler ways?

Can anybody have any suggestion how could I go about doing this??
I appreciate any suggestions.

Regards.
 

When sampling the signal like this, you are doing a PCM conversion. If I remember correctly, Windows WAV format is indeed PCM, with some additional preamble.
So, if you are able to pack these data into a file with the correct additional information, you should be able to play them on a Windows OS (I reckon on other OSes as well).
PCM is quite inefficient. If you have a huge amount of data, and your MPU has enough power, you could try some software vocoder, like SPEEX. With Speex, you have the double advantage of a more compact format AND you can immediately play the sample on a PC - because one of the Speex porting is for PC.

Giuseppe
 
Thanks for quick reply.

Well I don't think that there will be huge amount of data to capture. The aim is to be able to record a conversation. I know I'm not being to specific but I'm not sure myself.
The uC i want to use is RENESAS M16C chip. It's a 16 bit chip so I think it should handle it.

So this SPEEX thing looks interesting, I'll look into it.
 

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