Communications system for transmitting and receiving data and voice signals simultaneously through 2-wire signal lines

Claim 2

A communications system for transmitting and receiving data signals and voice signals simultaneously on a 2-wire signal line (Ll), characterised by: superposing and extracting means (40,42,44,44A), coupled to the 2-wire signal line, for receiving data signals and voice signals from the 2-wire signal line . (L1), for extracting the received data signals, for superposing data signals to be transmitted on voice signals to be transmitted and for transmitting the data and voice signals onto the 2-wire signal line (Ll); obstructing means (46,46A) coupled to said superposing and extracting means (44,44A), for receiving the received data signals and the received voice signals, for obstructing the received data signals and for providing the received voice signals as an output; and a hybrid circuit (45,45A) coupled to said obstructing means (46,46A), for receiving the received voice signals and for transmitting the voice signals to be transmitted onto the 2-wire signal line via said obstructing means and said superposing and extracting means.

Claim 3

A communications system according to claim 1 characterised in that said superposing and extracting means includes means (40,42) for separately extracting the received data signals and superposing the data signals to be transmitted based on a predetermined time division mode.

Claim 4

A communications system according to claim 1 or 2 characterised in that the transmitted and received data signals comprise frequency shift keying (FSK) modulated signals.

Claim 5

A communications system according to any one of the preceding claims characterised in that said extracting and superposing means comprises a transformer (46,46A) coupled to the 2-wire signal line.

Claim 6

. A communications system according to claim 4 characterised in that said transformer (44,44A) has first, second and third windings, and wherein the first and second windings are respectively connected to the wires forming the 2-wire signal line (Ll).

Claim 7

A communications system according to claim 5 characterised in that said obstructing means comprises a capacitor (46,46A) coupled between the first and second windings of said transformer (44,44A).

Claim 8

A communications system according to any one of claims 1 to 4 characterised in that the data signals have a higher frequency than the voice signals and wherein said obstructing means comprises a capacitor (46,46A) which passes the voice signals, but which obstructs the data signals.

Claim 9

A communications system according to claim 1 characterised in that the data signals have a higher frequency than the voice signals and wherein said obstructing means comprises a low capacity capacitor (46,46A) which is capable of passing the voice signals, but which obstructs the data signals.

Claim 10

A communications system for transmitting and receiving data and voice signals simultaneously on a 2-wire signal line (Ll), characterised by: a transformer (44,44A) having first and second windings respectively coupled to the wires forming the 2-wire signal line (Ll) and having a third winding, the first and second windings for conducting voice signals received on the 2-wire signal line and voice signals to be transmitted on the 2-wire signal line, said third winding for extracting data signals received on the 2-wire signal line and for superposing data signals to be transmitted on the 2-wire signal line onto the voice signals to be transmitted on the 2-wire signal line; obstructing means (46,46A) coupled to said first and second windings of said transformer (44,44A) for obstructing data signals while passing received voice signals and voice signals to be transmitted on the 2-wire signal line; and a hybrid circuit (45,45A) coupled to said obstructing means (46,46A) and to said first and second windings of said transformer (44,44A), for receiving the voice signals received on the 2-wire signal line and for transmitting voice signals to be transmitted on the 2-wire signal line.

Claim 11

A communications system for transmitting and receiving data and voice signals simultaneously on a 2-wire signal line (Ll), characterised by: a transformer (44,44A) having first and second windings respectively coupled to the wires forming the 2-wire signal line (Ll) and having a third winding, the first and second windings for conducting voice signals received on the 2-wire signal line and voice signals to be transmitted on the 2-wire signal line, said third winding for extracting data signals received on the 2-wire signal line and for superposing data signals to be transmitted on the 2-wire signal line onto the voice signals to be transmitted on the 2-wire signal line; obstructing means (46,46A) coupled to said first and second windings of said transformer (44,44A) for obstructing data signals while passing received voice signals and voice signals to be transmitted on the 2-wire signal line; and a hybrid circuit (45,45A) coupled to said obstructing means (46,46A) and to said first and second windings of said transformer (44,44A), for receiving the voice signals received on the 2-wire signal line and for transmitting voice signals to be transmitted on the 2-wire signal line.

Claim 12

A communications system according to claim 9 characterised in that the datr signals have a higher frequency than the voice signals, and in that said obstructing means comprises a capacitor (46,46A) which passes the voice signals but which obstructs the data signals.

Claim 13

A communications system according to claim 10 characterised by means (40,42) coupled to the third winding of said transformer (44A), for causing the transformer to extract the received data signals and superpose the data signals to be transmitted based on a predetermined time division mode.

Claim 14

A communications system according to claim 11 characterised in that the transmitted and received data signal comprise frequency shift keying (FSK) modulated signals.

Claim 15

A communications system for transmitting and receiving data signals and voice signals simultaneously on a 2-wire signal line (Ll), characterised by: a number of 2-wire signal lines (Ll-LN); superposing and extracting means (40,42;44,44A) coupled to each 2-wire signal line for receiving data signals and voice signals from the 2-wire signal line, for extracting the received data signals, for superposing data signals to be transmitted on voice signals to be transmitted and for transmitting the data and voice signals onto the 2-wire signal line; obstructing means (46,46A) coupled to said superposing and extracting means (40,42,44,44A) for receiving the received data signals and the received voice signals, for obstructing the received data signals and for providing the received voice signals as an output; a hybrid circuit (45,45A) coupled to said obstructing means (46,46A) for receiving the received voice signals and for transmitting the voice signals to be transmitted onto the 2-wire signal line via said obstructing means and said superposing and extracting means; a multiplexer (48) coupled to each superposing and extracting means (44) for fetching the received data signals during a predetermined data receiving period which is distributed to each 2-wire signal line (Ll-LN); and a demultiplexer coupled to each superposing and extracting means (44) for distributing the transmitting data signals to each 2-wire signal line (L1-LN) corresponding to said transmitting data signals during the predetermined data transmitting period for each said 2-wire signal line (Ll-LN).

Claim 16

A communications system for transmitting and receiving data signals and voice signals simultaneously on a 2-wire signal line (Ll), characterised by: a number of 2-wire signal lines (Ll-LN); superposing and extracting means (40,42;44,44A) coupled to each 2-wire signal line for receiving data signals and voice signals from the 2-wire signal line, for extracting the received data signals, for superposing data signals to be transmitted on voice signals to be transmitted and for transmitting the data and voice signals onto the 2-wire signal line; obstructing means (46,46A) coupled to said superposing and extracting means (40,42,44,44A) for receiving the received data signals and the received voice signals, for obstructing the received data signals and for providing the received voice signals as an output; a hybrid circuit (45,45A) coupled to said obstructing means (46,46A) for receiving the received voice signals and for transmitting the voice signals to be transmitted onto the 2-wire signal line via said obstructing means and said superposing and extracting means; a multiplexer (48) coupled to each superposing and extracting means (44) for fetching the received data signals during a predetermined data receiving period which is distributed to each 2-wire signal line (Ll-LN); and a demultiplexer coupled to each superposing and extracting means (44) for distributing the transmitting data signals to each 2-wire signal line (L1-LN) corresponding to said transmitting data signals during the predetermined data transmitting period for each said 2-wire signal line (Ll-LN).

Claim 17

A communications system according to claim 13 characterised by a transformer (44,44A) having first and second windings respectively coupled to the wires forming the 2-wire signal line (Ll) and having a third winding, the first and second windings for conducting voice signals received on the 2-wire signal line and voice signals to be transmitted on the 2-wire signal line, said third winding for extracting data signals received on the 2-wire signal line and for superposing data signals to be transmitted on the 2-wire signal line onto the voice signals to be transmitted on the 2-wire signal line; and by means (40,42) coupled to the third winding of said transformer (44,44A) for causing the transformer to extract the received data signals and superpose the data signals to be transmitted based on a predetermined time division mode.

Claim 18

A communications system according to claim 13 or 14 characterised in that the transmitted and received data signal comprise frequency shift keying (FSK) modulated signals.