Personal object detector

Details Personal object detector Personal object detector

1996-04-25

1998-03-03

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

367910, 367102, G01S 1500

Patent

active

057243131

ABSTRACT:
A personal object or obstacle detector apparatus comprises a continuous transmission frequency modulation (CTFM) ranging system and an audio output device. The CTFM ranging system transmits a frequency-swept pressure wave, receives a reflected frequency-swept pressure wave from at least one object, and forms an audio signal based upon a frequency difference between the frequency-swept pressure wave and the reflected frequency-swept pressure wave the audio signal having an amplitude dependent upon size of the object. The audio output device produces an acoustic pressure wave in dependence upon the audio signal. In a preferred embodiment, the acoustic pressure wave contains separate tones for each of the objects detected, wherein each tone has a pitch dependent upon the distance from the CTFM ranging system to the corresponding object. Another embodiment utilizes a pair of CTFM ranging systems to produce a stereo auditory map of objects and obstacles.

REFERENCES:
patent: 3172075 (1965-03-01), Kay
patent: 4280204 (1981-07-01), Elchinger
patent: 4551825 (1985-11-01), Biber
patent: 4680740 (1987-07-01), Treptow
patent: 4712003 (1987-12-01), Ban et al.
patent: 4761770 (1988-08-01), Kim et al.
patent: 5341346 (1994-08-01), Youlton

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