Pocket Ghost uses the microphone in your Windows Mobile or Pocket PC device to measure ambient subsonic, sonic and supersonic sound in your environment. Using this information it calculates a ParaNormal Quotient which is a measure of potential paranormal activity in the vicinity.
Theory of Operation
It has been reported that paranormal activity is evidenced by sounds inaudible, or barely audible, to the human ear. Animals, whose hearing is more acute at higher frequencies than ours, are able to detect supersonic sounds, generally above 12-15 kiloHertz or so. For example, dogs are reported to behave oddly during supernatural events. Sounds of very low frequency, less than a hundred Hertz or so, are normally felt rather than heard by us.
The built-in microphone circuitry in most Windows Mobile and Pocket PC devices is designed to detect frequencies in the audio range, but there is some residual response from the circuit at the very low (subsonic) and very high (supersonic) frequencies.
Pocket Ghost uses fast software-based Infinite Impulse Response (IIR) filters to measure the level of sub- and super-sonic sound pressure waves incoming at the microphone. It also measures the audible sound level. The three ranges are shown on the Pocket Ghost display via three meters, which move dynamically and are updated several times a second.
The ParaNormal Quotient (PNQ) is calculated from a formula that sums the sound levels in the sub- and super- sonic ranges, and subtracts the audible range value. This yields a number which increases as the sub- and super- frequencies (which are difficult or impossible for us to hear) increase, as compared to the audible frequencies.
The PNQ value is indicated by a set of concentric bands at the centre of the Pocket Ghost display.
High PNQ values may be caused by a variety of events:
Low frequency rumbling (e.g. from heavy trucks or machinery)
High frequency noises (e.g. dog whistles, or keys jangling)
Supernatural phenomena (don't drop your Pocket PC when you run away in fright!)
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Supported operating systems:
Pocket PC 2002, Windows Mobile 2003, Windows Mobile 5.0, Windows Mobile 6 Classic, Windows Mobile 6 Professional, Windows Mobile 6.1 Classic, Windows Mobile 6.1 Professional, Windows Mobile 6.5 Professional
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