Time division switching arrangement utilizing a hybrid circuit

Claim 2

A hybrid circuit for transferring signals between the incoming and outgoing paths of a four-wire line and a two-wire line in a time division communication system comprising means connected to said incoming path in a first time interval including means for receiving a signal from said incoming path and first means for storing said received incoming path signal, means for applying said stored incoming path signal to said twowire line, second means normally connected to said two-wire line for storing the sum of the incoming path signal applied to said two-wire line and the signal outgoing from said two-wire line, means operative in a second time interval including means for disconnecting said second storing means from said two-wire line, means for subtracting a portion of the stored incoming path signal in said first storing means from the signal in said second storing means, and means for applying the resultant difference signal corresponding to said two-wire line outgoing signal to said outgoing path.

Claim 3

A hybrid circuit according to claim 1 wherein said first storing means includes means for storing a portion of said received incoming path signal in said first time interval, and said stubtracting means comprises means for serially connecting said portion storing means, and said second storing means to said outgoing path applying means in said second time interval.

Claim 4

A hybrid circuit according to claim 1 wherein said first storing means comprises first and second serially connected storage capacitors, said second storing means comprises a third storage capacitor, and said subtracting means comprises means for connecting one terminal of said third storage capacitor to the junction of said first and second storage capacitors, and means for connecting the other terminal of said third storage capacitor to said outgoing path applying means.

Claim 5

A hybrid circuit according to claim 3 wherein said means for connecting said one third storage capacitor terminal to said junction comprises a first bidirectional semiconductor switch having one electrode connected to said junction and another electrode connected to said one terminal, and said means for connecting said other terminal of said third storage capacitor to said outgoing path comprises a second bidirectional semiconductor switch having a first electrode connected to said other terminal and a second electrode connected to said outgoing path applying means.

Claim 6

A hybrid circuit according to claim 4 wherein each of said first and second bidirectional semiconductor switches is an insulated gate field effect transistor, each having a gate electrode, a source and a drain, said source being said first electrode, said drain being said second electrode, siad gate electrode being connected to a control signal source.

Claim 7

A hybrid circuit for transferring signals between the incoming and outgoing paths of a four-wire line and a balanced two-wire line having first and second conductors cOmprising means connected to said incoming path in a first time interval including means for receiving a signal from said incoming path and first means for storing said incoming path signal, means for coupling said stored incoming path signal from said storing means to said two-wire line comprising means for applying a first signal corresponding to said stored incoming path signal to said first conductor, and means for applying a second signal corresponding to the inverted stored incoming path signal to said second conductor, second means normally connected to said two-wire line for storing the sum of said first signal, said second signal and the signal outgoing from said two-wire line, means operative in a second time interval including means for disconnecting said second storing means from said two-wire line and means for subtracting the stored incoming path signal in said first storing means from the sum of said first signal, said second signal and said outgoing signal in said second storing means, and means for applying the resultant difference signal corresponding to said two-wire line outgoing signal to said outgoing path.

Claim 8

A hybrid circuit for transferring signals between the incoming and outgoing paths of a four-wire line and a balanced two-wire line having first and second conductors cOmprising means connected to said incoming path in a first time interval including means for receiving a signal from said incoming path and first means for storing said incoming path signal, means for coupling said stored incoming path signal from said storing means to said two-wire line comprising means for applying a first signal corresponding to said stored incoming path signal to said first conductor, and means for applying a second signal corresponding to the inverted stored incoming path signal to said second conductor, second means normally connected to said two-wire line for storing the sum of said first signal, said second signal and the signal outgoing from said two-wire line, means operative in a second time interval including means for disconnecting said second storing means from said two-wire line and means for subtracting the stored incoming path signal in said first storing means from the sum of said first signal, said second signal and said outgoing signal in said second storing means, and means for applying the resultant difference signal corresponding to said two-wire line outgoing signal to said outgoing path.

Claim 9

In a time division communication system wherein a plurality of time slots occur in repetitive cycles and each time slot includes at least two distinct time intervals, a circuit for transferring signals between a bidirectional path and an incoming path and an outgoing path in a selected time slot comprising means selectively connectible to said incoming path for receiving a signal from said incoming path in one time interval of said selected time slot, first means connected to said receiving means for storing said received incoming path signal, means for applying said stored received incoming path signal to said bidirectional path, means normally connected to said bidirectional path including second means for storing the sum of the incoming signal applied to said bidirectional path and the outgoing signal from said bidirectional path, means operative in another time interval of said selected time slot including means for disconnecting said second storing means from said bidirectional path and means for subtracting a portion of said stored incoming path signal in said first storing means from the signal in said second storing means and for applying the resultant difference signal corresponding to said bidirectional path outgoing signal to said outgoing path.

Claim 10

In a time division communication system wherein a plurality of time slots occur in repetitive cycles and each time slot includes at least two distinct time intervals, a circuit for transferring signals between a bidirectional path and an incoming path and an outgoing path in a selected time slot comprising means selectively connectible to said incoming path for receiving a signal from said incoming path in one time interval of said selected time slot, first means connected to said receiving means for storing said received incoming path signal, means for applying said stored received incoming path signal to said bidirectional path, means normally connected to said bidirectional path including second means for storing the sum of the incoming signal applied to said bidirectional path and the outgoing signal from said bidirectional path, means operative in another time interval of said selected time slot including means for disconnecting said second storing means from said bidirectional path and means for subtracting a portion of said stored incoming path signal in said first storing means from the signal in said second storing means and for applying the resultant difference signal corresponding to said bidirectional path outgoing signal to said outgoing path.

Claim 11

In a time division communication system wherein a plurality of time slots occur in repetitive cycles and each time slot includes at least two distinct time intervals, a circuit according to claim 7 wherein said receiving means comprises first switching means connected between said incoming path and said first storing means, said first storing means comprises a pair of serially connected capacitors, said applying means comprises amplifying means connected between said first storing means and said bidirectional path, said subtracting means comprises second switching means for connecting one of said first storing means capacitors in series with said second storing means and third switching means for serially connecting said one of the first storing means capacitors and said second storing means to said outgoing path applying means.

Claim 12

In a time division communication system wherein a plurality of time slots occur in repetitive cycles and each time slot is divided into at least two distinct time intervals, a circuit according to claim 7 further comprising control means for controlling the order of occurrences of said time intervals so that said one time interval occurs prior to said other time interval.

Claim 13

In a time division communication system wherein a plurality of time slots occur in repetitive cycles and each time slot is divided into at least two distinct time intervals, a circuit according to claim 7 further comprising control means controlling the order of said time intervals so that said other time interval occurs prior to said one time interval.

Claim 14

A time divisioN communication system wherein a plurality of time slots occur in repetitive cycles and each time slot includes at least a first distinct time interval comprising a plurality of stations; first and second common buses; a signal transfer network connected between said first and second common buses for transferring signals from said second bus to said first bus; means for generating first and second control signals in each time interval, each station having an associated coupling circuit connected to said station, said first common bus and said second common bus; each coupling circuit comprising means responsive to said first control signal for receiving signals from said first common bus, first means for storing said received signals, means for applying said stored received signals to said associated station, second storing means normally connected to said associated station for storing the sum of said applied stored received signals and signals outgoing from said associated station, and means responsive to said second control signal for disconnecting said second storing means from said associated station, means for subtracting a portion of the signal stored in said first storing means from the signal stored in said second storing means, and means for applying the resultant difference from said subtracting means to said second common bus; means operative in said first time interval of said distinct time slot comprising means for applying said first control signal to the first station coupling circuit and means for applying said second control signal to the second station coupling circuit whereby a signal is transferred from said first station to said second station in said distinct time slot.

Claim 15

A time divisioN communication system wherein a plurality of time slots occur in repetitive cycles and each time slot includes at least a first distinct time interval comprising a plurality of stations; first and second common buses; a signal transfer network connected between said first and second common buses for transferring signals from said second bus to said first bus; means for generating first and second control signals in each time interval, each station having an associated coupling circuit connected to said station, said first common bus and said second common bus; each coupling circuit comprising means responsive to said first control signal for receiving signals from said first common bus, first means for storing said received signals, means for applying said stored received signals to said associated station, second storing means normally connected to said associated station for storing the sum of said applied stored received signals and signals outgoing from said associated station, and means responsive to said second control signal for disconnecting said second storing means from said associated station, means for subtracting a portion of the signal stored in said first storing means from the signal stored in said second storing means, and means for applying the resultant difference from said subtracting means to said second common bus; means operative in said first time interval of said distinct time slot comprising means for applying said first control signal to the first station coupling circuit and means for applying said second control signal to the second station coupling circuit whereby a signal is transferred from said first station to said second station in said distinct time slot.

Claim 16

A time division communication system according to claim 11 wherein each time slot further includes a second distinct time interval and further comprises means operative in said second time interval of said distinct time slot including means for applying the first control signal to said second station coupling circuit, and means for applying the second control signal to said first station coupling circuit.

Claim 17

A time division communication system according to claim 11 wherein said first storing means comprises first and second serially connected storage capacitors, said second storing means comprises a third storage capacitor and said subtracting means comprises means for serially connecting said second storage capacitor and said third storage capacitor to said resultant difference applying means.

Claim 18

A time division communication system according to claim 13 wherein said receiving means comprises first switching means responsive to said first control signal applied to said coupling circuit for connecting said first common bus to said first storing means, said disconnecting means comprises second switching means responsive to said second control signal for disconnecting said third storage capacitor from said station, and said serially connecting means comprises third switching means responsive to said second control signal for connecting said second storage capacitor to one terminal of said third storage capacitor and for connecting the other terminal of said third storage capacitor to said resultant difference applying means.

Claim 19

A time division communication system according to claim 14 wherein each of said switching means comprises an IGFET having gate, source and drain electrodes, said first switching means comprising an IGFET having its source electrode connected to said first common bus, its drain electrode connected to said first storing means and its gate electrode connected to said first control signal applying means, said second switching means comprising one IGFET having its source electrode connected to one station conductor, its drain electrode connected to said one terminal of said third storage capacitor and its gate electrode connected to said second control signal applying means and another IGFET having its source electrode connected to the other terminaL of said third storage capacitor, its drain electrode connected to the other station conductor and its gate electrode connected to said second control signal applying means and said third switching means comprises one IGFET having its source electrode connected to one terminal of said second storage capacitor, its drain electrode connected to said one terminal of said third storage capacitor and its gate electrode connected to said second signal applying means, and another IGFET having its source electrode connected to the other terminal of said third storage capacitor, its drain electrode connected to said outgoing path, and its gate electrode connected to said second control signal applying means.

Claim 20

A time division communication system wherein a plurality of time slots occur in repetitive cycles and each time slot includes at least first and second time intervals comprising a plurality of stations; first and second common buses; control means for generating first and second control signals in each time interval; each station having an associated coupling circuit connected to said station, said first common bus and said second common bus; each coupling circuit comprising means responsive to said first control signal for receiving a signal from said first common bus, first means for storing said received signal, means for applying said stored received signal to said associated station, second means normally connected to said associated station for storing the sum of the coupled received signal and the signal outgoing from said associated station, means responsive to said second control signal for disconnecting said second storing means from said associated station, means for subtracting a portion of the signal in said first storing means from the signal in said second storing means, and means for coupling the resultant difference signal corresponding to the outgoing signal from said station to said second common bus; means operative in said first time interval comprising means for applying said second control signal to a first station coupling circuit, and third means connected to said second common bus for storing the outgoing signal from said first station coupling circuit, means operative in said second time interval comprising means for applying said first control signal to a second station coupling circuit, and means for applying said first station outgoing signal in said third storing means to said first common bus.

Claim 21

A time division communication system wherein a plurality of time slots occur in repetitive cycles and each time slot includes at least first and second time intervals comprising a plurality of stations; first and second common buses; control means for generating first and second control signals in each time interval; each station having an associated coupling circuit connected to said station, said first common bus and said second common bus; each coupling circuit comprising means responsive to said first control signal for receiving a signal from said first common bus, first means for storing said received signal, means for applying said stored received signal to said associated station, second means normally connected to said associated station for storing the sum of the coupled received signal and the signal outgoing from said associated station, means responsive to said second control signal for disconnecting said second storing means from said associated station, means for subtracting a portion of the signal in said first storing means from the signal in said second storing means, and means for coupling the resultant difference signal corresponding to the outgoing signal from said station to said second common bus; means operative in said first time interval comprising means for applying said second control signal to a first station coupling circuit, and third means connected to said second common bus for storing the outgoing signal from said first station coupling circuit, means operative in said second time interval comprising means for applying said first control signal to a second station coupling circuit, and means for applying said first station outgoing signal in said third storing means to said first common bus.

Claim 22

A time division communication system according to claim 16 wherein each time slot further includes third and fourth time intervals further comprising means operative in said third time interval comprising means for applying said second control signal to the second station coupling circuit and fourth means connected to said second common bus for storing the outgoing signal from said second station coupling circuit; and means operative in said fourth time interval comprising means for applying said first control signal to said first station coupling circuit, and means for applying said second station outgoing signal in said fourth storing means to said first common bus.

Claim 23

A time division communication system wherein a plurality of time slots occur in repetitive cycles and each time slot includes first and second time intervals comprising a plurality of stations; first and second common buses, control means for generating first and second control signals in a distinct time slot, each station having an associated coupling circuit connected to said station, said first common bus and said second common bus; each coupling circuit comprising means responsive to a first control signal for receiving a signal from said first common bus, first means for storing said received signal, means for applying said stored received signal to said associated station, second means normally connected to said associated station for storing the sum of the applied received signal and the signal outgoing from said associated station, means responsive to a second control Signal for disconnecting said second storing means from said associated station, means responsive to said second control signal for subtracting a portion of the signal in said first storing means from the signal in said second storing means and means for coupling the resultant difference signal corresponding to the outgoing signal from said station to said second common bus; means for transferring signals from a first station to a second station in said distinct time slot comprising apparatus operative in said first time interval comprising means for applying said second control signal to said first station coupling circuit disconnecting means and subtracting means, and third means connected to said second common bus for storing the outgoing signal from said first station subtracting means; means operative in a second time interval of said distinct time slot comprising means for applying said first control signal to said second station coupling circuit receiving means, and means for applying the stored outgoing first station signal in said third storing means to said first common bus.

Claim 24

A time division communication system wherein a plurality of time slots occur in repetitive cycles and each time slot includes first and second time intervals comprising a plurality of stations; first and second common buses, control means for generating first and second control signals in a distinct time slot, each station having an associated coupling circuit connected to said station, said first common bus and said second common bus; each coupling circuit comprising means responsive to a first control signal for receiving a signal from said first common bus, first means for storing said received signal, means for applying said stored received signal to said associated station, second means normally connected to said associated station for storing the sum of the applied received signal and the signal outgoing from said associated station, means responsive to a second control Signal for disconnecting said second storing means from said associated station, means responsive to said second control signal for subtracting a portion of the signal in said first storing means from the signal in said second storing means and means for coupling the resultant difference signal corresponding to the outgoing signal from said station to said second common bus; means for transferring signals from a first station to a second station in said distinct time slot comprising apparatus operative in said first time interval comprising means for applying said second control signal to said first station coupling circuit disconnecting means and subtracting means, and third means connected to said second common bus for storing the outgoing signal from said first station subtracting means; means operative in a second time interval of said distinct time slot comprising means for applying said first control signal to said second station coupling circuit receiving means, and means for applying the stored outgoing first station signal in said third storing means to said first common bus.

Claim 25

A time division communication system wherein a plurality of time slots occur in repetitive cycles and each time slot includes first, second, third and fourth time intervals comprising a plurality of stations; first common bus and second common bus; control means for generating first and second control signals, each station having an associated coupling circuit connected to said station, said first common bus and said second common bus; each coupling circuit comprising means responsive to a first control signal for receiving a signal from said first common bus, first means for storing said received signal, means for applying said stored received signal to said associated station, second means normally connected to said associated station for storing the sum of said coupled received signal and the signal outgoing from said associated station, means responsive to a second control signal for disconnecting said second storing means from said associated station, means responsive to said second control signal for subtracting a portion of the signal in said first storing means from the signal in said second storing means and means for coupling the resultant difference signal corresponding to the outgoing signal from said station to said second common bus; means for exchanging signals between a first station and a second station in a distinct time slot comprising means operative in said first time interval comprising means for applying said second control signal to said first station coupling circuit subtracting means and said first station coupling circuit disconnecting means; and third means connected to said second common bus for storing the outgoing signal from said first station subtracting means; means operative in said second time interval of said distinct time slot comprising means for applying said second control signal to the second station coupling circuit subtracting means and the second station coupling circuit disconnecting means, and fourth means connected to said second common bus for storing the outgoing signal from said second station coupling circuit subtracting means; means operative in said third time interval of said distinct time slot comprising means for applying said first control signal to said second station coupling circuit receiving means and means for applying the stored outgoing first station signal in said third storing means to said first common bus; and means operative in the fourth time interval of said distinct time slot comprising means for applying said first control signal to said first station coupling circuit receiving means, and means for applying the stored second station outgoing signal in said fourth storing means to said first common bus.

Claim 26

A time division communication system wherein a plurality of time slots occur in repetitive cycles and each time slot includes first, second, third and fourth time intervals comprising a plurality of stations; first common bus and second common bus; control means for generating first and second control signals, each station having an associated coupling circuit connected to said station, said first common bus and said second common bus; each coupling circuit comprising means responsive to a first control signal for receiving a signal from said first common bus, first means for storing said received signal, means for applying said stored received signal to said associated station, second means normally connected to said associated station for storing the sum of said coupled received signal and the signal outgoing from said associated station, means responsive to a second control signal for disconnecting said second storing means from said associated station, means responsive to said second control signal for subtracting a portion of the signal in said first storing means from the signal in said second storing means and means for coupling the resultant difference signal corresponding to the outgoing signal from said station to said second common bus; means for exchanging signals between a first station and a second station in a distinct time slot comprising means operative in said first time interval comprising means for applying said second control signal to said first station coupling circuit subtracting means and said first station coupling circuit disconnecting means; and third means connected to said second common bus for storing the outgoing signal from said first station subtracting means; means operative in said second time interval of said distinct time slot comprising means for applying said second control signal to the second station coupling circuit subtracting means and the second station coupling circuit disconnecting means, and fourth means connected to said second common bus for storing the outgoing signal from said second station coupling circuit subtracting means; means operative in said third time interval of said distinct time slot comprising means for applying said first control signal to said second station coupling circuit receiving means and means for applying the stored outgoing first station signal in said third storing means to said first common bus; and means operative in the fourth time interval of said distinct time slot comprising means for applying said first control signal to said first station coupling circuit receiving means, and means for applying the stored second station outgoing signal in said fourth storing means to said first common bus.