SIMULASI SISTEM PENGACAKAN SINYAL SUARA SECARA REALTIME BERBASIS FAST FOURIER TRANSFORM (FFT)

Abstract

In this research, the voice signal from the telephone line communication system is processed by secure conversation system. The system performs real time recording the voice signal as the input signal through a microphone available on your computer. In the process of encryption, signal information in the form of analog signals (time domain) is converted into the frequency domain using Fast Fourier Transformalgorithm (FFT) 16 points and 32 points. Secure conversation system using 32 point FFT has a longer processing time than the 16 point FFT. For systems that use 16 point FFT takes an average of 0.18564seconds, while the 32 point FFT takes an average of 2.70816 seconds with a time difference of 2.55252seconds.