This project aims to analyze the information distorted in the noise through the Power Spectral Density (PSD) analysis. After applying certain pressure to the pressure sensor, the pressure measurement is transformed into frequency signal by using voltage to frequency converter (VFC). This incoming data or noisy signal is then analyzed using MATLAB based on PSD analysis; Non-parametric (Periodogram) method and parametric (Yule-Walker estimation, Burg) method to identify the signal buried in the noise.