Binaural ultrasound detector and imager

Details Binaural ultrasound detector and imager Binaural ultrasound detector and imager

1990-02-15

1991-11-26

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Echo systems

Returned signal used for control

G01S 1500

Patent

active

050688324

ABSTRACT:
A frequency translator converts inaudible sounds into audible sounds while reserving the phase relationship of the sounds. The translator mixes a local reference frequency with an inaudible receive signal to translate the receive signal to an audible frequency. If the receive signal exceeds a predetermined value, the reference frequency gets shifted in phase to correspond to the phase of the receive signal at that moment. The resulting translated signal is thus in phase with the receive signal at the moment of shift, so that the time-of-arrival of the receive signal is not lost. When used individually in conjunction with left and right listening channels, the translator enables a listener to hear as well as sense the time-of-arrival of otherwise inaudible signals.

REFERENCES:
patent: 4290127 (1981-09-01), Pridham et al.
patent: 4324142 (1982-04-01), Auphan et al.
patent: 4672330 (1987-06-01), Floyd et al.

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