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Object detecting apparatus for use in automobile

  • US 5,212,467 A
  • Filed: 03/27/1991
  • Issued: 05/18/1993
  • Est. Priority Date: 03/28/1990
  • Status: Expired due to Fees
First Claim
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1. An object detecting circuit for use in an automobile, comprising:

  • an ultrasonic transmitting section, a receiving section, and a control device, said ultrasonic transmitting section including(i) a trigger circuit supplying a trigger signal,(ii) a transmission signal oscillation circuit responsive to said trigger signal for supplying an excitation signal of a predetermined frequency,(iii) a transmission signal amplifying circuit receiving said excitation signal for supplying an ultrasonic driver signal, and(iv) a transmitter receiving said ultrasonic driver signal and, in response, supplying ultrasonic acoustic energy;

    said receiving section including(i) an ultrasonic transducer responsive to reflected ultrasonic acoustic energy for supplying a detected ultrasonic signal,(ii) an automatic gain control circuit responsive to said trigger signal for supplying a gain control signal,(iii) a temperature compensating circuit responsive to an ambient temperature for supplying a temperature compensation signal,(iv) an amplifying circuit receiving said detected ultrasonic signal and, responsive to said gain control signal and said temperature compensation signal, supplying an amplified detected signal, andsaid control device including(i) a filtering circuit receiving said amplified detected signal and supplying a filtered detected signal,(ii) an integrating circuit receiving said filtered detected signal for supplying a first time integrated signal,(iii) a summing-adding circuit receiving said first time integrated signal and responsive to a threshold control signal for supplying a second time integrated signal,(iv) a comparator receiving said filtered detected signal and said second time integrated signal and, in response, supplying a first logic signal,(v) a detection level control circuit responsive to said trigger signal for supplying said threshold control signal,(vi) a reference time generating circuit responsive to said trigger signal for supplying first through third time reference signals,(vii) a function control circuit responsive to said first through third time reference signals and to said first logic signal for supplying first through third function signals,(viii) a first function circuit responsive to said first function signal for supplying a first alerting signal,(ix) a second function circuit responsive to said second function signal for supplying a second alerting signal,(x) a third function circuit responsive to said third function signal for supplying a third alerting signal, and(xi) a first and second function deciding circuit responsive to said first and second altering signals for supplying a composite alerting signal.

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