Reflective object detector with compensated receiver signal

Details Reflective object detector with compensated receiver signal Reflective object detector with compensated receiver signal

1986-07-15

1988-01-12

Swann, III, Glen R.

Communications, electrical: acoustic wave systems and devices

Echo systems

Presence or movement only detection

340552, 340554, 367 94, G08B 1316

Patent

active

047196041

ABSTRACT:
To accommodate for a change in the level of a received wave which occurs as a function of the distance between an object, the existence of which is to be detected, and a detector, the detector includes a receiver circuit which has an amplifier circuit having a gain which changes exponentially with an elapsed time since an ultrasonic wave has been transmitted. The amplifier circuit includes ramp signal generating means having an output level which changes in proportion to an elapsed time since a control signal assumes its on level, non-linear signal processing means for non-linearly processing a signal which is output from the ramp signal generating means, and a variable amplification amplifier having an amplification factor which depends on a signal level which is output from the non-linear signal processing means.

REFERENCES:
patent: 3955171 (1976-05-01), Skoures et al.
patent: 4193055 (1980-03-01), Barnum
patent: 4542489 (1985-09-01), Naruse
patent: 4608674 (1986-08-01), Guscott

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