Method and apparatus for establishing a threshold with the use o

Details Method and apparatus for establishing a threshold with the use o Method and apparatus for establishing a threshold with the use o

1992-01-31

1993-12-28

Heyman, John S.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307356, 307359, 307362, 307494, H03K 5153

Patent

active

052742733

ABSTRACT:
A threshold setting circuit receives a signal coupled to the signal terminal of a comparator, delays then amplifies the signal and couples the delayed-amplified signal through a switch to the threshold signal terminal of the comparator. Prior to the reception of a signal which exceeds the threshold, the threshold level is set at the amplified noise level which is stored in storage means coupled to the threshold signal terminal. When the signal exceeds the amplified noise level, the switch is opened prior to the time that the delayed amplified signal is coupled to the threshold signal terminal and stored with the amplified noise in the storage means. Sometime after the signal ceases to exceed the amplified noise threshold level the switch is closed and the storage means tracks the amplified noise to maintain a current threshold level.

REFERENCES:
patent: 3327139 (1967-06-01), Hillman
patent: 4839605 (1989-06-01), Trett et al.
patent: 4908875 (1990-05-01), Assael et al.
patent: 4950923 (1990-08-01), Garuts
patent: 5015879 (1991-05-01), Lasagna et al.
patent: 5015892 (1991-05-01), Parsi et al.
patent: 5142554 (1992-08-01), Stribling et al.

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