Data transmission device and data transmission method

• US 20060050820A1
• Filed: 02/10/2004
• Published: 03/09/2006
• Est. Priority Date: 06/02/2003
• Status: Abandoned Application

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Mizuguchi, Yuji, Shibata, Osamu, Saito, Yoshiyuki, Katta, Noboru, Suenaga, Hiroshi, Akita, Takashi, Umei, Toshitomo, Sakai, Takahisa, Kawada, Hirotsugu
• Application Number:
  US10/539,235
• Publication Number:
  US 20060050820A1
• Time in Patent Office: Days
• US Class Current: 375/354
• CPC Class Codes: H04L 7/00 Arrangements for synchronising receiver with transmitter synchronisation of generators of electric oscillations or pulses H03L7/00
• CPC Class Codes: H04L 7/0334 Processing of samples having at least three levels, e.g. soft decisions

Abstract

A signal receiver (11) receives an analog signal via a twisted pair cable (31). An A/D converter (12) converts the analog signal to a digital signal. A phase detection unit (14) detects the phase of the digital signal, and generates a reception timing signal. A transmission timing generation unit (15) controls, based on the reception timing signal, timing for a transmission processing unit (16) to output the digital signal such that the reception signal (point A) and a transmission signal (point D) are different in phase by a predetermined degree. The transmission processing unit (16) outputs, in accordance with the timing, a digital signal obtained by performing mapping on data inputted from a connection device (20). A D/A converter (17) converts the digital signal to an analog signal. A signal transmitter (18) transmits the analog signal via a twisted pair cable (32).

Claims

1. A data transmission apparatus carrying out telecommunications with another apparatus via different transmission paths for transmission and reception, the apparatus comprising:

a receiver for receiving a signal transmitted from another apparatus via a transmission path for reception;

a signal processing unit for generating a transmission signal based on transmission data in synchronization with the reception signal received by the receiver;

a transmitter for transmitting the transmission signal generated in the signal processing unit to another apparatus via a transmission path for transmission; and

a phase control unit for adjusting a phase of the transmission signal to set a phase difference between the reception signal received by the receiver and the transmission signal to be transmitted by the transmitter to a predetermined value, wherein

the transmission paths are twisted pair cables and

the phase control unit sets the predetermined value to a phase difference for reducing radiation noise due to crosstalk between a common-mode signal generated in a twisted pair cable for reception and a common-mode signal generated in a twisted pair cable for transmission.

2. The data transmission apparatus according to claim 1, wherein the phase control unit includes:

a phase detection unit for detecting a phase of the reception signal; and

a timing control unit for controlling timing for the signal processing unit to generate the transmission signal in accordance with a detection result of the phase detection unit.

3. The data transmission apparatus according to claim 2, wherein

the phase control unit further includes a phase adjustment unit for adjusting the phase by delaying the transmission signal generated in the signal processing unit by a predetermined amount.

5. The data transmission apparatus according to claims 1, wherein

the predetermined value is 90 degrees or 270 degrees.

4. (canceled)

6. A data transmission method for carrying out telecommunications with another apparatus via different transmission paths for transmission and reception, the method comprising:

a reception step of receiving a signal transmitted from another apparatus via a transmission path for reception;

a generation step of generating a transmission signal based on transmission data in synchronization with the reception signal received in the reception step;

a setting step of adjusting a phase of the transmission signal for setting a phase difference between the reception signal received in the reception step and the transmission signal generated in the generation step to a predetermined value; and

a transmission step of transmitting the transmission signal whose phase adjusted in the setting step to another apparatus via a transmission path for transmission, wherein

the transmission paths are twisted pair cables, and

the setting step sets the predetermined value to a phase difference for reducing radiation noise due to crosstalk between a common-mode signal generated in a twisted pair cable for reception and a common-mode signal generated in a twisted pair cable for transmission.

7. A semiconductor integrated circuit in which a circuit for carrying out telecommunications with another apparatus via different transmission paths for transmission and reception is integrated on a semiconductor substrate, the semiconductor integrated circuit comprising:

a reception circuit for receiving a signal transmitted from another apparatus via a transmission path for reception;

a signal processing circuit for generating a transmission signal based on transmission data in synchronization with the reception signal received by the reception circuit;

a transmission circuit for transmitting the transmission signal generated by the signal processing circuit to another apparatus via a transmission path for transmission; and

a phase control circuit for adjusting a phase of the transmission signal to set a phase difference between the reception signal received by the reception circuit and the transmission signal to be transmitted by the transmission circuit to a predetermined value, wherein

the transmission paths are twisted pair cables, and

the phase control circuit sets the predetermined value to a phase difference for reducing radiation noise due to crosstalk between a common-mode signal generated in a twisted pair cable for reception and a common-mode signal generated in a twisted pair cable for transmission.