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Audio Signal Processing

Personal-object-detector-with-enhanced-stereo-imaging-capability

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Personal object detector with enhanced stereo imaging capability

Details

Inventors: Burgess, David; Felsenstein, Lee; Saunders, Steven E.;
Assignee: Interval Research Corp. (Palo Alto, CA)
Primary Examiner: Pihulic; Daniel T.
Assistant Examiner:
Attorney, Agent or Firm: Brooks & Kushman PC

A personal object or obstacle detector apparatus with enhanced stereo imaging capability includes a sonar system having dual receivers with field lobes positioned based on psychoacoustic considerations such as interaural intensity difference (IID) and interaural time difference (ITD). Receiver field pattern shapes and directions are selected to match the natural IID and ITD associated with human hearing. In one embodiment, dual receivers are used with a common transmitter while another embodiment utilizes two transmitter/receiver pairs with the transmitter and receiver collocated.

DETAILED DESCRIPTION As such, one object of the present invention is to provide an object detector which can be miniaturized and produced at a low cost while capable of creating a veridical stereo image of the object for the user.
A further object of the present invention is to provide an object or obstacle detector which considers human psychoacoustic phenomena in positioning of the receivers and their associated field patterns.
Another object of the present invention is to provide an obstacle detector which is inconspicuous within the environment of the user.
Still another object of the present invention is to provide an object or obstacle detector which can detect several objects simultaneously and differentiate between them to the user.
In carrying out the above objects, the present invention provides a personal object detector comprising a continuous transmission frequency modulation (CTFM) ranging system and an audio output device.
The CTFM ranging system is operative in transmitting a frequency-swept pressure wave, receiving a reflected frequency-swept pressure wave from an object, and forming an audio signal based upon a frequency difference between the frequency-swept pressure wave and the reflected frequency-swept pressure wave.
The audio output device produces an acoustic pressure wave in dependence upon the audio signal.
In a preferred embodiment, the acoustic pressure wave contains a tone for each of several objects, wherein each tone has a pitch dependent upon the distance from the CTFM ranging system to the corresponding object.
Further in carrying out the above objects, the present invention provides a personal object detector apparatus comprising a first CTFM ranging system, a second CTFM ranging system, and a pair of audio output devices.
The first CTFM ranging system transmits a first frequency-swept pressure wave, receives a first reflected frequency-swept pressure wave from an object, and forms a first signal dependent upon a frequency difference between the first frequency-swept pressure wave and the first reflected frequency-swept pressure wave

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