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In this paper we present the development of Sound Pressure Level Meter and Frequency
Spectrum Analyzer application for Android based devices. The developed application can
visualize real time waveform and frequency spectrum of an input audio signal in both
linear and dB scale. The GPS location, current date and time are also embedded to the
application for convenience. A comparison was carried out with currently available
smartphone apps of similar type and the results are in good agreement with the app
developed in this project. The current version of the app is capable of capturing signal of
maximum frequency up to 4000Hz. Therefore, analysis of frequency spectrum of the
voice transmission which range between 300Hz to 3400Hz can be carried out
successfully.
