Voice communication through Arduino.

I am new to Arduino. As a part of our project we want to send a voice message through transmitter module . we are planing to put a arduino on the receiver side and on the sending side just a memory module, which is constantly transmitting the audio . The communication distance is around 500m. Can you suggest an idea?

For audio signals you need one of the big and fast Arduinos (Leonardo…) or a RasPi, with much memory.

Which transmitter module? Does it have the bandwidth to support audio?

What will the Arduino do?