Sperry Marine Inc.

Ernest S Gasser

James D Halsey

Mark J Baginski

Dale W Jessen

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.

Method and apparatus for establishing a threshold with the use of a

A system for identifying a received signal includes a comparator wherein random variables defining the signal are compared to upper and lower thresholds established in accordance with a statistical cube defined by the statistics determined for each random variable by processing a multiplicity of the received signals.

Digital statistical processing for signal parameter determination

A crystal video receiver having CW and pulse detection capability includes a threshold signal generator which switchably provides fixed and noise riding threshold signals, used to determine initial signal detection. Track and hold circuits provide a second threshold, derived from the peak received signal level, for establishing the termination of received video pulses. A pulse width counter is coupled to determine the time a received pulse signal is between the two thresholds and is set to overflow at a predetermined time after the reception of a signal to establish a pulse representative of a received CW signal and to prevent receiver lock up.

Growing community of inventors

Earlysville, VA, United States of America

Ernest S Gasser