Automatic frequency control system

• US 3,199,045 A
• Filed: 08/09/1961
• Issued: 08/03/1965
• Est. Priority Date: 08/09/1961
• Status: Expired due to Term

• Current Assignee: Berkum Petrus A Van, Daniel J. Herick
• Original Assignee: Berkum Petrus A Van, Daniel J. Herick
• Inventors: Herick, Daniel J., BERKUM PETRUS A VAN
• Application Number:
  US04/130,290
• Time in Patent Office: 1,455 Days
• US Class Current: 331/8
• CPC Class Codes: H04N 5/126 whereby the synchronisation signal indirectly commands a frequency generator

Claims

1. A PHASE-CONTROLLED SYSTEM COMPRISING:

A SEMICONDUCTOR DEVICE HAVING A BASE ZONE OF ONE CONDUCTIVITY INTERPOSED BETWEEN EMITTER AND COLLECTOR ZONES OF OPPOSITE CONDUCTIVITY AND CONSTITUTING THEREWITH BASE-EMITTER AND BASE-COLLECTOR JUNCTIONS;

A FIRST SOURCE FOR PRODUCING AN ALTERNATING-CURRENT SIGNAL THE PHASE OF WHICH IS TO BE MEASURED;

A SECOND SOURCE FOR PRODUCING A SIGNAL TO BE USED AS A PHASE REFERENCE;

A STORAGE CAPACITOR;

A FIRST SIGNAL PATH, INCLUDING SAID FIRST SOURCE AND SAID CAPACITOR CONNECTED IN SERIES WITH SAID EMITTER AND COLLECTOR JUNCTIONS, FOR CHARGING SAID CAPACITOR IN ONE SENSE;

A SECOND SIGNAL PATH, INCLUDING SAID FIRST AND SECOND SOURCES AND SAID CAPACITOR CONNECTED IN SERIES ACROSS ONLY ONE OF SAID BASE-EMITTER AND BASE-COLLECTOR JUNCTIONS, FOR CHARGING SAID CAPACITOR IN THE OPPOSITE SENSE;

SAID SECOND SOURCE BEING POLED TO CAUSE CONDUCTION SELECTIELY IN ONE OF SAID SIGNAL PATHS AND IN AN AMOUNT DETERMINED BY THE SENSE AND EXTENT OF DEVIATION OF SAID SIGNALS FROM A PREDETERMINED PHASE CONDITION;

AND FILTER MEANS FOR DERIVING FROM SAID CAPACITOR A SUBSTANTIALLY DIRECT CURRENT POTENTIAL REPRESENTING PHASE CHANGES OF SAID SIGNALS FROM SAID PREDETERMINED PHASE CONDITION.