Automatic noise rejection for use in scanner and the like

Details Automatic noise rejection for use in scanner and the like Automatic noise rejection for use in scanner and the like

1981-08-19

1984-02-21

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including gain control means

330129, H03G 310

Patent

active

044333048

ABSTRACT:
In a system such as an ultrasonic scanner in which a signal must be variably amplified with time in response to a time gain control (TGC) signal, automatic noise rejection is provided by periodically comparing amplified noise with a threshold value above which noise interferes with signal analysis. TGC signal control of a variable amplifier is permitted so long as the amplified noise is less than the threshold value. A maximum control voltage, V.sub.n, is applied to the variable amplifier when the amplified noise exceeds the threshold level.

REFERENCES:
patent: 4066977 (1978-01-01), Chambers et al.
patent: 4292598 (1981-09-01), Yasumura
patent: 4360787 (1982-11-01), Galpin

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