Android Based Spectrum Analyzer

Abstract The paper discusses a new concept of analyzing the signal in frequency domain using an App based on Android OS. Analog input signal is applied to hardware signal conditioning block where it is filtered to avoid the aliasing effect programmable gainattenuation is provided to the signal using an programmatically selectable amplifier attenuator. The signal is digitized using internal ADC of ds PIC. Digitized samples are then transferred to the android device serially via Bluetooth which is controlled by dsPIC. A java based application installed on android device accepts samples performs FFT on them and display the signal in frequency domain. The performance of the proposed embedded system i.e. Hardware 26 software is then measured against some standard spectrum analyzer parameters. Greater cost reduction and smaller size of the embedded system offer advantages over conventional instruments.