Integrated transmitter, LAN communication equipment, telephone communication apparatus and communication method using integrated transmitter

• US 6,535,587 B1
• Filed: 05/23/2000
• Issued: 03/18/2003
• Est. Priority Date: 05/24/1999
• Status: Expired due to Fees

• Current Assignee: NEC Infrontia Corporation (NEC Corporation)
• Original Assignee: NEC Infrontia Corporation (NEC Corporation)
• Inventors: Kobayashi, Yoshikazu
• Primary Examiner(s): WOO, STELLA L
• Application Number:
  US09/576,494
• Time in Patent Office: 1,029 Days
• Field of Search: 379/90.01, 379/93.05, 379/93.06, 379/93.07, 379/93.08, 379/93.09, 379/399.01, 379/399.02, 370/480, 370/493, 370/498, 370/527, 370/529
• US Class Current: 379/90.01
• CPC Class Codes: H04M 11/06 Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors

Abstract

Disclosed is an integrated transmitter which is capable of a telephone and a LAN. The integrated transmitter comprises a first signal distribution circuit for distributing a LAN signal into first and second signals, each of which has an absolute value equal to each other; a second signal distribution circuit for distributing a telephone signal into third and fourth signals, each of which has an absolute value equal to each other; a coaxial cable for transmitting individually the first and third signals on one of two lines thereof and for transmitting the second and fourth signals on the other of the two lines thereof; a subtraction circuit for subtracting the second and fourth signals from the first and third signals to detect the LAN signal; and an adder circuit for adding the second and fourth signals to the first and third signals to detect the telephone signal.

Claims

1. An integrated transmitter comprising:

a first signal distribution circuit for distributing a LAN signal into first and second signals, each of which has an absolute value equal to each other;

a second signal distribution circuit for distributing a telephone signal into third and fourth signals, each of which has an absolute value equal to each other;

a transmission line having two lines which transmit individually said first and third signals and said second and fourth signals; and

a receiving circuit for detecting at least one of said LAN signal and said telephone signal by adding one of the signals to the other signal, transmitted on each of the two lines of said transmission line, or subtracting one of the signals from the other signal, transmitted on each of the two lines of said transmission line.

2. The integrated transmitter according to claim 1, wherein said first signal distribution circuit distributes said LAN signal into two signals and outputs the two signals as said first and second signals, the first signal being non-inverted and the second signal being inverted, each of which has an equal absolute value to each other, and said second signal distribution circuit distributes said telephone signal into two signals and outputs the two signals as said third and fourth signals, each of which has an equal absolute value to each other and a same sign to each other.

3. The integrated transmitter according to claim 1, wherein said first signal distribution circuit distributes said LAN signal into two signals and outputs the two signals as said first and second signals, each of which has an equal absolute value to each other and the same sign, and said second signal distribution circuit distributes said telephone signal into two signals and outputs the two signals as said third and fourth signals, the third signal being non-inverted and the fourth signal being inverted, each of which has an equal absolute value to each other.

4. The integrated transmitter according to claim 2, wherein said receiving circuit subtracts said second and fourth signals from said first and third signals to detect said LAN signal, the first and third signals being transmitted on one of said two lines and the second and fourth signals being transmitted on the other line.

5. The integrated transmitter according to any one of claims 2 or 4) wherein said receiving circuit adds said second and fourth signals to said first and third signals to detect said telephone signal, the first and third signals being transmitted on one of said two lines and the second and fourth signals being transmitted on the other line.

6. The integrated transmitter according to claim 3, wherein said receiving circuit adds said second and fourth signals to said first and third signals to detect said LAN signal, the first and third signals being transmitted on one of said two lines and the second and fourth signals being transmitted on the other line.

7. The integrated transmitter according to any one of claims 3 or 6, wherein said receiving circuit subtracts said second and fourth signals from said first and third signals to detect said telephone signal, the first and third signals being transmitted on one of said two lines and the second and fourth signals being transmitted on the other line.

9. The integrated transmitter according to any one of claims 1 or 8, wherein said transmission line is a transmission in compliance with LAN standards.

10. The integrated transmitter according to any one of claims 1 or 8, wherein said transmission line is a coaxial cable, and said two lines are a center conductor and an outer conductor of the coaxial cable, respectively.

11. The integrated transmitter according to claim any one of claims 1 or 8, wherein said transmission line is a twisted pair line, and said two lines are two conductive lines of the twisted pair line.

12. The integrated transmitter according to claim 10, wherein said outer conductor of said coaxial cable is grounded, one end of said coaxial cable is isolated from the first and second signal distribution circuits by a transducer, and the other end of said coaxial cable is isolated from the receiving circuit by a transducer.

13. The integrated transmitter according to claim 12, wherein a center tap of the transducer located on the receiving circuit side among the transducers on both sides of said coaxial cable is grounded relative to the receiving circuit.

14. The integrated transmitter according to any one of claims 1 or 8, the apparatus further comprising:

a power supplying circuit connected to said transmission line; and

a power receiving circuit for receiving a power supplying signal transmitted from said transmission line.

8. An integrated transmitter comprising:

a transmission circuit for distributing a LAN signal into first and second signals, each of which has an absolute value equal to each other, for distributing a telephone signal into third and fourth signals, each of which has an absolute value equal to each other, and for sending out individually said first and third signals and said second and fourth signals onto two lines of a transmission line; and

a receiving circuit for detecting at least one of said LAN signal and said telephone signal by adding one of the signals to the other signal, transmitted on each of the two lines of said transmission line, or subtracting one of the signals from the other signal, transmitted on each of the two lines of said transmission line.

15. A LAN communication equipment which is connected to an integrated transmitter having a transmission circuit for distributing a LAN signal into first and second signals, each of which has an absolute value equal to each other, for distributing a telephone signal into third and fourth signals, each of which has an absolute value equal to each other, and for sending out individually said first and third signals and said second and fourth signals onto two lines of a transmission line, comprising:

a receiving circuit for detecting said LAN signal and said telephone signal by adding one of the signals to the other signal, transmitted on each of the two lines of said transmission line, or subtracting one of the signals from the other signal, transmitted on each of the two lines of said transmission line;

a processing circuit for receiving the LAN signal detected by said receiving circuit to execute a data processing for the LAN signal; and

an interface for supplying the telephone signal detected by said receiving circuit to the outside.

16. A LAN communication equipment which is connected to an integrated transmitter having a transmission circuit for distributing a LAN signal into first and second signals, each of which has an absolute value equal to each other, for distributing a telephone signal into third and fourth signals, each of which has an absolute value equal to each other, and for sending out individually said first and third signals and said second and fourth signals onto two lines of a transmission line, comprising:

a receiving circuit for detecting said LAN signal and said telephone signal by adding one of the signals to the other signal, transmitted on each of the two lines of said transmission line, or subtracting one of the signals from the other signal, transmitted on each of the two lines of said transmission line;

a processing circuit for receiving the LAN signal detected by said receiving circuit to execute a data processing for the LAN signal; and

a telephone circuit for executing a telephone communication by the telephone signal detected by said receiving circuit.

17. A telephone communication equipment which is connected to an integrated transmitter having a transmission circuit for distributing a LAN signal into first and second signals, each of which has an absolute value equal to each other, for distributing a telephone signal into third and fourth signals, each of which has an absolute value equal to each other, and for sending out individually said first and third signals and said second and fourth signals onto two lines of a transmission line, comprising:

a receiving circuit for detecting said LAN signal and said telephone signal by adding one of the signals to the other signal, transmitted on each of the two lines of said transmission line, or subtracting one of the signals from the other signal, transmitted on each of the two lines of said transmission line;

a telephone circuit for executing a telephone communication by the telephone signal detected by said receiving circuit; and

an interface for supplying the LAN signal detected by said receiving circuit to the outside.

18. A communication method of a telephone signal and a LAN signal, comprising the steps of:

distributing a LAN signal into first and second signals, each of which has an absolute value equal to each other;

distributing a telephone signal into third and fourth signals, each of which has an absolute value equal to each other;

sending out individually said first and third signals onto one of two lines of a transmission line and said second and fourth signals onto the other of the two lines of the transmission line; and

detecting at least one of said LAN signal and said telephone signal by adding one of the signals to the other signal, or subtracting one of the signals from the other signal.