The acoustic orientation instrument
John L. Orr, Brian C. Mikiten · 1991
The Acoustic Orientation Instrument-lll (AOI) is a device which produces acoustic signals based on the jlight parameters of an aircrajt.The AOI is programmed in Forth in order to make the sound generation hardware easily accessible to experimenters without extensive programming backgrounds.Complexity of coding and speed is secondary to providing a virtual patch-panel system where dl@erent encoding strategies may easily be tested.The instrument has no mechanically adjustable potentiometers in the audio mixer system.The functions normally pe~ormed by trimmers are accomplished with digital potentiometers and the software described here.