Signal processing circuit of ultrasonic diagnostic apparatus

Details Signal processing circuit of ultrasonic diagnostic apparatus Signal processing circuit of ultrasonic diagnostic apparatus

1981-12-15

1984-02-21

Howell, Kyle L.

Measuring and testing

Vibration

By mechanical waves

128660, G01N 2900

Patent

active

044322364

ABSTRACT:
An echo signal irradiated from an ultrasonic scanner and reflected back from a subject under examination is amplified by a logarithm amplifier and is amplitude-detected by a detector. An adder adds to the detected echo signal an STC voltage, a gain control voltage and a gain control feedback voltage. The gain-controlled echo signal from the adder is input to a multiplier and multiplied by a dynamic control voltage and a negative feedback gain control voltage. The negative feedback gain control voltage is obtained by integrating the output from the multiplier and inverting and amplifying the obtained signal.

REFERENCES:
patent: 4043181 (1977-08-01), Nigam
patent: 4145741 (1979-03-01), Nappin
patent: 4205555 (1980-06-01), Hashiguchi
patent: 4248091 (1981-02-01), Hasiguchi
patent: 4289140 (1981-09-01), Carpenter et al.
patent: 4327738 (1982-05-01), Green et al.

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