Handheld Audio Spectrum Analyzer for Windows Mobile

From Armchair Applications:

From the developer: HASA is a handheld audio frequency spectrum analyzer for the Pocket PC. Frequency components of sounds picked up by the built-in microphone are shown and analyzed in real-time. The frequency decomposition can be shown as a standard plot of dB vs. Hz or as a 'cascade' plot, showing its time evolution. The user may choose to average the frequency response data over an extended period of time, and exclude a region of the measured time data in order to remove any observed transient anomalies that may appear. The measured spectrum can be A-Weighted, and can be stored as a file in the PocketPC. Another included feature is note detection, where the equivalent piano note on the equal-tempered scale is detected from the measured spectrum.

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