Echo-sounding apparatus

Details Echo-sounding apparatus Echo-sounding apparatus

1982-08-20

1985-03-12

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

G01S 760, G01S 766

Patent

active

045049319

ABSTRACT:
Echo-sounding apparatus with circuitry for achieving enhanced recording on electrically sensitive paper is disclosed in which the gain of a variable gain amplifier is reduced exponentially depending on the input signal amplitude as soon as this amplitude exceeds a predetermined level. The signal generated by the variable gain amplifier is supplied to low pass and high pass filters which are connected to two inputs of a differential amplifier which controls the recording element.

REFERENCES:
patent: 3332056 (1967-07-01), Drenkelfort
patent: 3350682 (1967-10-01), Drenkelfort et al.
patent: 3440598 (1969-04-01), Drenkelfort et al.
patent: 4308601 (1981-12-01), Lahr

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