adc block in simulink library

how can I use adc blocks in matlab simulink library? there is only output but i cant input a signal ....please help...thanks in advance!!

Answer 1

[Kaustubha Govind]

Which library did you get the block from? Click the "Help" button on the block dialog to see where the input is read from. I believe most of the ADC blocks read the input directly from the microphone input or other peripherals. If you are not reading an input from a peripheral, the signal is already in digital form, so you don't need an ADC block.