This is a very interesting and funny project made with the help of the GR SAKURA board which can record the speech and play it back in the voice of a parrot. It might look like a toy but there are lot of technology behind its working like voice sampling, memory card interfacing, PWM etc. Voice signals are continuous analog signals and the digital devices like microcontrollers cannot handle the continuous analog signals.  Most of the microcontrollers have an ADC module which can do analog to digital conversion. The microcontroller uses sampling technique to convert the continuous analog signals to discrete digital equivalent samples. While recording the voice, the GR SAKURA board samples the voice signals and writes the sampled values to a file at the sampling time itself.