I would like to make some processing of speech signal in real time. How can I use microphone as input in 21489 EZKIT? Do I have to use mic with internal power supply or mic for standard PC could be used.
For getting the inputs from the microphones, the EZ-KIT board as it is may not be able to get the inputs directly from MIC. You may need to have an additional circult for this purpose and the digital signals can be connected directly to the DAI headers. SPORT module in ADSP-21489 can be used to receive data for processing.
Please let me know in case you have any further queries/doubts.
Could I use some mic with internal supply whose output could directly go to input to AD converter of KIT?
With the EZ-KIT Lites we generally find that it is a matter of impedance. You could certainly try with a PC microphone, but we have typically found that the impedance isn't significant enough on these to work with the EZ-KIT (results may vary, depending on the mic of course).
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