Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
90 words
A line circuit for the tip and ring conductors of a telephone line comprising: a transformer having tip, ring and balancing windings, said balancing winding being poled in opposite sense to that of said tip and ring windings; current source means serially connected in circuit with said tip, ring and balancing windings, said current source means having a high AC impedance; and a capacitor in circuit with said current source means and said balancing winding, said capacitor exhibiting a low AC impedance to current in said tip and ring windings.
Claim 2
Dependent Claim
90 words
A line circuit for the tip and ring conductors of a telephone line comprising: a transformer having tip, ring and balancing windings, said balancing winding being poled in opposite sense to that of said tip and ring windings; current source means serially connected in circuit with said tip, ring and balancing windings, said current source means having a high AC impedance; and a capacitor in circuit with said current source means and said balancing winding, said capacitor exhibiting a low AC impedance to current in said tip and ring windings.
Claim 3
Dependent Claim
40 words
A line circuit according to claim 1 wherein said current source means comprises: a source of potential; solid-state means in circuit between said source of potential and said windings; and means for maintaining said solid-state means in an unsaturated condition.
Claim 4
Dependent Claim
52 words
The invention of claim 2 wherein said solid-state means includes a transistor having its emitter-collector path connected between said source of potential and said windings and wherein said means for maintaining said solid-state means in said unsaturated condition includes a Darlington transistor connected to supply base current to said first mentioned transistor.
Claim 5
Dependent Claim
44 words
The invention of claim 3 wherein the collector of said first mentioned transistor is connected to one end of said balancing winding and said capacitor is connected to the junction of said tip and ring windings with the other end of said balancing winding.
Claim 6
Dependent Claim
47 words
The invention of claim 4 wherein the collector-emitter path of said Darlington transistor is in circuit between a source of current and the base of said first mentioned transistor and the base of said Darlington transistor is connected to said junction of said windings with said capacitor.
Claim 7
Dependent Claim
77 words
A telephone line circuit comprising a transformer having at least one winding for sensing audio frequency variations in loop current and a balancing winding for counterbalancing the DC magnetization produced by said audio frequency sensing winding, a capacitor providing an audio frequency bypass around said balancing winding, and means including the collector-emitter path of a transistor for exhibiting a high impedance path in circuit with said capacitor and said balancing winding to audio frequency voltages induced therein.
Claim 8
Dependent Claim
77 words
A telephone line circuit comprising a transformer having at least one winding for sensing audio frequency variations in loop current and a balancing winding for counterbalancing the DC magnetization produced by said audio frequency sensing winding, a capacitor providing an audio frequency bypass around said balancing winding, and means including the collector-emitter path of a transistor for exhibiting a high impedance path in circuit with said capacitor and said balancing winding to audio frequency voltages induced therein.
Claim 9
Dependent Claim
29 words
The invention of claim 6 further comprising means for biasing said transistor to remain out of saturation throughout the peak value of said voltages induced in said balancing winding.
Claim 10
Dependent Claim
33 words
The invention of claim 7 wherein said biasing means includes the junctions of a plurality of solid-state devices in circuit between the base of said transistor and one end of said balancing winding.