The idea behind the proposed product is kindled from the traditional method of checking the quality of coconut by tapping on it. This method works on the principle that the natural frequency of the defected coconut will change, if it is tapped on the outer shell. Some characteristic features such as mass, density, volume, etc., of the defected coconuts will vary. If the coconuts are knocked by hammer or by a mechanical means to generate the impulse sound waves, the magnitude and frequency of the waves will vary.

These sound signals are picked by the microphone. The frequency and amplitude analysis can be made to evaluate the quality of the coconut. Since the frequency component signal having wide range of frequencies, to predict the exact hit frequency component the Fast Fournier Transformation (FFT) is used. The Linear Prediction Coefficient (LPC) technique is also used to estimate the accurate frequency component which leads to increase the reliability of the information analyzed through FFT techniques even though subjected to external environmental noise and other factors such as varying size of the coconuts.