Abstract

In expressing sinusoidal waves mathematically with the addition of the amplitude parameters, the equation becomes x(n) = ?An sin 2?fnt. Signals in the form of sinusoidal waves can experience interference when getting frequency readings. This interference is caused by the presence of noise in the sinusoidal wave signal. In this study, the amplitude of sinusoidal signal and noise will be compared to determine how much noise affects frequency readings. The method adopted to transform discrete data x(n) into frequency is the Discrete Fourier Transform. Based on the results obtained, when the amplitude value in discrete data is greater than the noise value, frequency readings are defined and clear. Noise value double the value of the amplitude value can still yield frequency readings from a structure; however, results are barely comprehensible.  

Keywords

Amplitude, noise, frequency, signal, sinusoidal waves.